Patricio M Arana - Academia.edu (original) (raw)

Papers by Patricio M Arana

Investigaciones marinas, 2000

RESUMEN. Con el objeto de buscar recursos alternativos a la langosta de Juan Fernández (Jasus fro... more RESUMEN. Con el objeto de buscar recursos alternativos a la langosta de Juan Fernández (Jasus frontalis), que constituye el objetivo tradicional de los pescadores artesanales, se efectuó una campaña de pesca exploratoria con trampas en torno a las islas Robinson Crusoe y Santa Clara (Archipiélago de Juan Fernández, Chile). Entre el 11 de noviembre de 1996 y el 23 de marzo de 1997 se realizaron un total de 71 salidas de pesca, en las que se caló un total de 241 trampas, entre 50 y 1000 m de profundidad. En estas experiencias se utilizaron distintos diseños de trampas: troncocónico, tetragonal y piramidal, de diferente tamaño y ubicación de las entradas, y trampas langosteras con entrada en un extremo y en la parte superior. Las dos últimas, las utilizan los pescadores del archipiélago para la extracción de la langosta. Las trampas troncocónicas, tetragonales y piramidales fueron caladas con entradas circulares o rectangulares. Los únicos crustáceos capturados correspondieron a: langosta de Juan Fernández (Jasus frontalis), centolla de Juan Fernández (Paromola rathbuni), jaiba remadora (Ovalipes trimaculatus) y cangrejo dorado (Chaceon chilensis). La langosta se capturó entre 50 y 100 m; la centolla de Juan Fernández entre 100 y 300 m; el cangrejo dorado entre 200 y 1000 m; mientras que la jaiba remadora se encontró sólo en el veril de 100 m. El único recurso que presenta interés pesquero es C. chilensis, tanto por su abundancia como por la amplia distribución en profundidad y en torno a las islas analizadas. Palabras claves: pesca exploratoria, trampas, crustáceos, archipiélago de Juan Fernández, Chile. Exploratory survey with pots around Robinson Crusoe and Santa Clara islands, Juan Fernandez archipelago, Chile * ABSTRACT. Looking for alternative resources to the Juan Fernandez spiny rock lobster (Jasus frontalis), the traditional target species of the artisanal fishermen of the archipelago, an exploratory fishing campaign with fishing pots was conducted around Robinson Crusoe and Santa Clara islands. Between November 11, 1996, and March 23, 1997, a total of 71 fishing journeys were conducted, during which 241 pots were set between 50 and 1000 m depth. In these experiences different pot designs were used: conical-trunk, tetragonal, piramidal, and lobster pots with a wicket on one extreme and lobster pot with an upper wicket. The last two, are the ones often used by the archipelago fishermen to catch lobsters. The conical-trunk, tetragonal and piramidal pots were with circular or rectangular wickets. The resources caught were: Juan Fernandez spiny rock lobster (Jasus frontalis), Juan Fernandez king crab (Paromola rathbuni), rowing crab (Ovalipes trimaculatus) and golden crab (Chaceon chilensis). The spiny rock lobster was captured between 50 and 100 m depth, while the rowing crab was found only in the 100 m isobath; Juan Fernandez king crab between 100 and 300 m and the golden crab between 200 and 1000 m. The only resource with fishing interest is C. chilensis, both by its abundance as well as for its wide distribution in depth and around these islands.

Lat. Am. J. Aquat. Res, 2009

... Cristian Canales 1 & Patricio Arana 2. ... de estos recursos se ha determinado principalm... more ... Cristian Canales 1 & Patricio Arana 2. ... de estos recursos se ha determinado principalmente mediante proyectos de investigación que utilizan el método de área barrida (Roa et al, 1996, 1997, 1998; Acuña et al, 1998, 1999; ECM, 2000, Arana et al, 2002; Bahamonde et al, 2000 ...

Revista de Biología Tropical, 2005

In the Magellan Region of southern Chile (52 degrees 20'S - 55 degrees 30'S), the edible ... more In the Magellan Region of southern Chile (52 degrees 20'S - 55 degrees 30'S), the edible urchin Loxechinus albus is collected by 1200 artisanal fishermen, of whom 450 are divers. About 360 small fishing boats and 54 transport vessels carry the fresh product to 16 processing plants. Landings of about 27 000 tons were recorded between January and December 1995. Test diameters of urchins harvested monthly were measured for a total of 119 239 specimens, and 36 406 specimens were individually weighed; sex determination was carried out on 2 314 specimens. Field data indicate that the harvest was about 6.6 x 106 dozen urchins (this is a measuring method employed by fishermen in the region), with an extractive effort of 14 753 diver/days. The fisheries yield ranged from an annual minimum of 235 DUDD (dozen urchins per diver/day) to a maximum of 660 DUDD. In overall terms, the lowest average yields were between January and April (415-427 DUDD), and the highest yields between May and ...

Ccamlr Science, 1996

... D, mawsoni) se rencontre des abords de l'ile Pierre 1" (6E049'S), dans la mer ... more ... D, mawsoni) se rencontre des abords de l'ile Pierre 1" (6E049'S), dans la mer de Bellingshausen (70°38'S) jusqu'aux iles Clarence et de lf~lephant (61°14'S), alors que la l6gine australe (D. eleginoides) a 6t6 captur6e de l'ile du Roi Georges, dans Ifocean Austral ...

Most bottom trawling around the world occurs in shelf areas covered by unconsolidated sediments, ... more Most bottom trawling around the world occurs in shelf areas covered by unconsolidated sediments, which can negatively affect bottom communities in several ways. We present a new bottom sampler device that can be attached to trawl nets or other bottom fishing gears. This device consists of a steel tube with a piston positioned in the interior to slide the material collected after the trawling and two lateral supports for fixing the device to the footrope of the trawl. Sampling design consisted in comparison two distinct sites, in each of them were conducted three tows with the sediment sampler device and at the begin and final of each tow it were collected sediment samples with Van Veen grab. PERMANOVA test on macrofauna composition indicated no significant difference in relation to both sampler devices. During the experiment, was not detected any problems in relation to positioning and using the new sampler. The addition of extra weight to the ballast cord did not unestablished the ...

2017 IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics)

This paper submits the results of the acoustic cruise made in the austral summer of 2016. The sur... more This paper submits the results of the acoustic cruise made in the austral summer of 2016. The survey delivers the bottom bathymetry, the geographic distribution of krill concentrations, and the presence of fish shoals in 1,500 nautical miles over the shelf and the continental slope (100–500 m), around Elephant Island and South Orkney Islands. Krill concentrations are described, as well as those of mackerel icefish (Champsocephalus gunnari), the latter representing the most abundant fish species in the research, besides other finfish species in the area. The mackerel iceflsh was found between 160 and 449 m depth, associated to steep bottom, showing demersal characteristics during the day and semi-pelagic overnight. During the darkness hours, the mean determined depth in the schools was 207.1 ± 62.6 m around Elephant Island and 219.4 ± 55.8 m in South Orkney Islands.

Latin American Journal of Aquatic Research

A research survey for demersal finfish was completed using bottom trawl fishing gear, following a... more A research survey for demersal finfish was completed using bottom trawl fishing gear, following a random stratified sampling design, between 50 and 500 m on shelf areas of subarea 48.1 (Elephant Island) and Subarea 48.2 (South Orkney Island). An acoustic survey was simultaneously carried out to enhance knowledge of bathymetry and the distribution of fish and krill in the studied area. The cruise took place between the 6 and 27 January 2018. A total of 36 hauls were carried out, 15 around Elephant Island and 21 around the South Orkney Islands. A total of 37 fish species were caught with a total biomass of 19,112 kg. The main species encountered included Notothenia rossii and Champsocephalus gunnari, with nominal catches weighing 16,204 (85%) and 876 kg (5%), respectively. Other species of fish accounted noticeably for lower amounts (11%), such as Gobionotothen gibberifrons (330 kg), Chaenocephalus aceratus (322 kg), and Pseudochaenichthys georgianus (299 kg). Indicative estimates of ...

Latin American Journal of Aquatic Research

Krill (Euphausia superba) catch is currently the most relevant fishery industry in Antarctic wate... more Krill (Euphausia superba) catch is currently the most relevant fishery industry in Antarctic waters. This resource is a keystone species in the Antarctic food web, sustaining the contribution to the trophic ecology of many invertebrate and vertebrate species. To catch krill, part of the fleet in this fishery uses large mid-water nets that also retain a diversity of other organisms like plankton, meroplankton, and fish species as bycatch. Therefore, it is necessary to understand and evaluate the magnitude of this incidental catch, as well as the potential interactions between krill fishing gear with seabirds and mammals. To estimate the composition and extent of bycatch for this fishery included 784 samples of 25 kg and an equal number of 1 kg sub-samples obtained from Antarctic krill catches in Subarea 48, between years 2012 and 2016. A total of 15 fish species were identified along with the record of five other taxa and other unidentified specimens. The most relevant fish species b...

Latin American Journal of Aquatic Research

Antarctic krill (Euphausia superba) is a key resource in the Antarctic region, as it is the prima... more Antarctic krill (Euphausia superba) is a key resource in the Antarctic region, as it is the primary food source for fish, whales, seals, flying birds, penguins and cephalopods. The high concentrations of the species and its possible uses -food for human and animal consumption and in the production of industrial, pharmaceutical and dietetic products- generates interest in the fishing industry. Its relevance motivated the implementation of administrative measures and international regulations for this fishery, which are summarized in this review. Chile is the only South American fishing country that has shown interest in participating in Antarctic krill fishery. Thus, between 1983 and 1994, the Fisheries Development Institute and some companies carried out fishing activities mainly aimed at prospecting and researching this species. However, starting in 2011, the factory trawler Betanzos began sustained commercial krill fishing aimed at krill meal production. This document analyzes the...

An understanding of host-parasite interactions represents an important, but often overlooked, axi... more An understanding of host-parasite interactions represents an important, but often overlooked, axis for predicting how marine biodiversity may be impacted by continued environmental change over the next century. For host and parasite communities in the Southern Ocean, investigations of many major groups of parasites have largely been limited to taxonomic and phylogenetic studies, creating an urgent need for the collection of baseline ecological data if we are to detect changes in host-parasite interactions in the future. Here, we survey three species of Crocodile icefish (Notothenioidei: Channichthyidae) collected from two island archipelagos in Antarctica’s South Scotia Arc region for evidence of leech infestations. Specifically, we report on infestation prevalence and intensity of three leech species (Trulliobdella bacilliformis, Trulliobdella capitis, and Nototheniobdella sawyeri) on the host fish species Chaenocephalus aceratus, Champsocephalus gunnari, and Chionodraco rastrospin...

Fisheries Research, 2016

Abstract Spatial processes are rarely considered explicitly in the evaluation and management of m... more Abstract Spatial processes are rarely considered explicitly in the evaluation and management of marine invertebrate populations. This is particularly true when larval drift acts as one of the main mechanisms of population expansion. The ecological concept metapopulation is widely used and accepted for understanding low-mobility marine populations. This study uses a length-based dynamic analysis model for nylon shrimp (Heterocarpus reedi) exploited off central Chile (25°–37°S) to contrast various hypotheses of population structure and spatial connectivity. The two subpopulations studied are located to the north and south of 32°S. The model is fitted to the historical fishery data (from the mid-1940s to the present), the results of monitoring of fishing activities (1970s-present), and research surveys (1990s-present). Statistically, several hypotheses can explain the data. The most likely hypothesis is that of a metapopulation in which the south zone acts as a source population (reproductive refuge) and determines, partially or totally, the recruits in the north zone, thereby explaining the population increase over the last decade. Empirical evidence will strengthen the hypothesis of spatial connectivity and special attention should be paid to the biological-fishery conditions recorded south of 32°S given the implications for managing the fishery for this resource.

Latin American Journal of Aquatic Research, 2016

How to cite Complete issue More information about this article Journal's homepage in redalyc.org ... more How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Stomatopoda and Decapoda in Chilean oceanic islands 1

Latin American Journal of Aquatic Research, 2016

Estimating the total biomass of fish stocks available for fishing at any one time can highly impr... more Estimating the total biomass of fish stocks available for fishing at any one time can highly improve the process of deciding upon sustainable fishing management measures. However, countries where fishing resources are not abundant or valuable can hardly justify a regular investment in costly direct stock assessment programs. One way of overcoming such difficulties is to use catch rate data recorded from monitored commercial fishing operations, usually made available through the implementation of less expensive Observers programs. However, this data is prone to overestimate biomass of targeted stocks, because fishermen tend to operate in high-density areas. This study addresses this issue by exploring the use of geostatistical models to estimate biomass of three slope fish stocks of the Brazilian EEZ: codling (Urophycis mystacea), hake (Merluccius hubbsi) and monkfish (Lophius gastrophysus).

Latin American Journal of Aquatic Research, Dec 1, 2008

Herein, we compare information taken from the Patagonian toothfish (Dissostichus eleginoides) fis... more Herein, we compare information taken from the Patagonian toothfish (Dissostichus eleginoides) fishery operations carried out off the far southern coast of Chile (47°00'S-57°00'S) using pots (pots) and longlines. In January 2006 and from June to October 2006, 167 fishing hauls were done, 119 using long-lines and 48 using pots. The total Patagonian toothfish catch was 60.9 tons, of which 81.2% were caught with long-lines and 18.8% with pots. On average, 5,395 hooks and 147 pots were set per haul, with average yields of 0.08 kg hook-1 and 1.43 kg pot-1. The average depth for setting the gear was 1,581 m (long-lines) and 1,318 m (pots). Significant differences were found between these two types of gear, as well as between the time of setting and the time of retrieval. Greater fishing yields were obtained from the long-line fishery operations, with significant differences between the gear types in terms of the catch per haul (kg haul-1) and the catch per length of the specimens retained (kg 1000 m-1). On average, the individuals caught with pots (110.8 cm total length) were larger than those caught with long-lines (105.1 cm total length). Nonetheless, no significant differences were recorded for the size structures. In terms of interactions with birds, during setting, no birds were observed at the trapping operations, whereas a few specimens (≤ 10 birds) were seen during only 2.5% of the long-line operations. During retrieval, birds were observed during 34.9% of the hauls with pots and 62.8% of the longline operations. The presence of mammals around the fishery operations during setting and retrieval was similar for both types of gear.

Latin American Journal of Aquatic Research, 2009

RESUMEN. Se analiza la información mensual de composición de tamaño recopilada en el monitoreo de... more RESUMEN. Se analiza la información mensual de composición de tamaño recopilada en el monitoreo de la pesca artesanal sobre cangrejo dorado (Chaceon chilensis) realizado entre julio de 2005 y mayo de 2006, para evaluar los parámetros de crecimiento, mortalidad natural y puntos biológicos de referencia de los machos sobre los cuales se basa esta pesquería. Se estableció una longevidad promedio de 20 años y una mortalidad natural en torno a M = 0,27 año-1. La talla crítica se determinó a los 110 mm de longitud cefalotorácica (Lc), que es levemente inferior a la talla de primera captura de 114 mm de Lc. De acuerdo al análisis efectuado, se explotan individuos entre 4 y 10 años de vida. Mediante análisis de equilibrio se determina que la población se encuentra en 82% de la condición virginal, que se refleja en una talla promedio en las capturas de 128 mm de Lc. Una eventual reducción de la población a un límite del 40% de la condición original, se consigue aumentando en tres veces el nivel actual de desembarques, lo que se traduciría en una talla media en las capturas de 118 mm de Lc. Finalmente, se recomiendan distintos puntos biológicos de referencia para garantizar una explotación sustentable en el tiempo. Palabras clave: crecimiento, mortalidad, evaluación, cangrejo dorado, Chaceon chilensis, archipiélago de Juan Fernández, Chile. Growth, mortality, and stock assessment of the golden crab (Chaceon chilensis) population exploited in the Juan Fernández archipelago, Chile ABSTRACT. Monthly information on the size composition of golden crab (Chaceon chilensis) catches compiled while monitoring the artisanal fishery (July 2005 through May 2006) is analyzed in order to evaluate the growth parameters, natural mortality, and biological reference points in male specimens, the basis of the fishery. Average longevity was found to be 20 years and natural mortality around M = 0.27. The critical size was determined to be around 110 mm carapace length (Lc), slightly lower than that of the first catch (114 mm Lc). According to this analysis, individuals between 4 and 10 years of age are exploited. A balance analysis revealed that 82% of the population is virginal, as reflected in an average size-at-catch of about 128 mm Lc. Tripling the current level of landings would lead to an eventual reduction to a limit of 40% of the original population; this would result in an average catch size of 118 mm Lc. Finally, several biological reference points are recommended for guaranteeing sustainable exploitation over time.

Industrias Pesqueras Revista Maritima Quincenal, 2013

Serie Cientifica Instituto Antartico Chileno, 1999

Latin American Journal of Aquatic Research, Mar 1, 2014

Fisheries Research, 2016

Abstract Two key elements in the adequate, sustained exploitation of any fishery should be consid... more Abstract Two key elements in the adequate, sustained exploitation of any fishery should be considered; the biological attributes of the species and how these vary over time and space. Research is needed to obtain a more thorough understanding of these effects, how they vary, and how they relate to environmental factors. For 17 years, biological information has been collected for Heterocarpus reedi (nylon shrimp) caught off central Chile (25–37 °S). Here, we analyze these data using generalized linear models and determine the factors responsible for changes in carapace length, body weight, maturity, and sex ratio. The environmental and alimentary conditions are better south of 32 °S, and this is probably associated with the better physical condition and reproductive attributes of H. reedi there. For example, individuals are larger, females are longer at first maturity (CL 50% ), and mature females are less prevalent. We outline a theoretical foundation that can guide future research on H. reedi . We also suggest that future conservation measures consider biological attributes within a spatial context.

Investigaciones marinas, 2000

RESUMEN. Con el objeto de buscar recursos alternativos a la langosta de Juan Fernández (Jasus fro... more RESUMEN. Con el objeto de buscar recursos alternativos a la langosta de Juan Fernández (Jasus frontalis), que constituye el objetivo tradicional de los pescadores artesanales, se efectuó una campaña de pesca exploratoria con trampas en torno a las islas Robinson Crusoe y Santa Clara (Archipiélago de Juan Fernández, Chile). Entre el 11 de noviembre de 1996 y el 23 de marzo de 1997 se realizaron un total de 71 salidas de pesca, en las que se caló un total de 241 trampas, entre 50 y 1000 m de profundidad. En estas experiencias se utilizaron distintos diseños de trampas: troncocónico, tetragonal y piramidal, de diferente tamaño y ubicación de las entradas, y trampas langosteras con entrada en un extremo y en la parte superior. Las dos últimas, las utilizan los pescadores del archipiélago para la extracción de la langosta. Las trampas troncocónicas, tetragonales y piramidales fueron caladas con entradas circulares o rectangulares. Los únicos crustáceos capturados correspondieron a: langosta de Juan Fernández (Jasus frontalis), centolla de Juan Fernández (Paromola rathbuni), jaiba remadora (Ovalipes trimaculatus) y cangrejo dorado (Chaceon chilensis). La langosta se capturó entre 50 y 100 m; la centolla de Juan Fernández entre 100 y 300 m; el cangrejo dorado entre 200 y 1000 m; mientras que la jaiba remadora se encontró sólo en el veril de 100 m. El único recurso que presenta interés pesquero es C. chilensis, tanto por su abundancia como por la amplia distribución en profundidad y en torno a las islas analizadas. Palabras claves: pesca exploratoria, trampas, crustáceos, archipiélago de Juan Fernández, Chile. Exploratory survey with pots around Robinson Crusoe and Santa Clara islands, Juan Fernandez archipelago, Chile * ABSTRACT. Looking for alternative resources to the Juan Fernandez spiny rock lobster (Jasus frontalis), the traditional target species of the artisanal fishermen of the archipelago, an exploratory fishing campaign with fishing pots was conducted around Robinson Crusoe and Santa Clara islands. Between November 11, 1996, and March 23, 1997, a total of 71 fishing journeys were conducted, during which 241 pots were set between 50 and 1000 m depth. In these experiences different pot designs were used: conical-trunk, tetragonal, piramidal, and lobster pots with a wicket on one extreme and lobster pot with an upper wicket. The last two, are the ones often used by the archipelago fishermen to catch lobsters. The conical-trunk, tetragonal and piramidal pots were with circular or rectangular wickets. The resources caught were: Juan Fernandez spiny rock lobster (Jasus frontalis), Juan Fernandez king crab (Paromola rathbuni), rowing crab (Ovalipes trimaculatus) and golden crab (Chaceon chilensis). The spiny rock lobster was captured between 50 and 100 m depth, while the rowing crab was found only in the 100 m isobath; Juan Fernandez king crab between 100 and 300 m and the golden crab between 200 and 1000 m. The only resource with fishing interest is C. chilensis, both by its abundance as well as for its wide distribution in depth and around these islands.

Lat. Am. J. Aquat. Res, 2009

... Cristian Canales 1 & Patricio Arana 2. ... de estos recursos se ha determinado principalm... more ... Cristian Canales 1 & Patricio Arana 2. ... de estos recursos se ha determinado principalmente mediante proyectos de investigación que utilizan el método de área barrida (Roa et al, 1996, 1997, 1998; Acuña et al, 1998, 1999; ECM, 2000, Arana et al, 2002; Bahamonde et al, 2000 ...

Revista de Biología Tropical, 2005

In the Magellan Region of southern Chile (52 degrees 20'S - 55 degrees 30'S), the edible ... more In the Magellan Region of southern Chile (52 degrees 20'S - 55 degrees 30'S), the edible urchin Loxechinus albus is collected by 1200 artisanal fishermen, of whom 450 are divers. About 360 small fishing boats and 54 transport vessels carry the fresh product to 16 processing plants. Landings of about 27 000 tons were recorded between January and December 1995. Test diameters of urchins harvested monthly were measured for a total of 119 239 specimens, and 36 406 specimens were individually weighed; sex determination was carried out on 2 314 specimens. Field data indicate that the harvest was about 6.6 x 106 dozen urchins (this is a measuring method employed by fishermen in the region), with an extractive effort of 14 753 diver/days. The fisheries yield ranged from an annual minimum of 235 DUDD (dozen urchins per diver/day) to a maximum of 660 DUDD. In overall terms, the lowest average yields were between January and April (415-427 DUDD), and the highest yields between May and ...

Ccamlr Science, 1996

... D, mawsoni) se rencontre des abords de l'ile Pierre 1" (6E049'S), dans la mer ... more ... D, mawsoni) se rencontre des abords de l'ile Pierre 1" (6E049'S), dans la mer de Bellingshausen (70°38'S) jusqu'aux iles Clarence et de lf~lephant (61°14'S), alors que la l6gine australe (D. eleginoides) a 6t6 captur6e de l'ile du Roi Georges, dans Ifocean Austral ...

Most bottom trawling around the world occurs in shelf areas covered by unconsolidated sediments, ... more Most bottom trawling around the world occurs in shelf areas covered by unconsolidated sediments, which can negatively affect bottom communities in several ways. We present a new bottom sampler device that can be attached to trawl nets or other bottom fishing gears. This device consists of a steel tube with a piston positioned in the interior to slide the material collected after the trawling and two lateral supports for fixing the device to the footrope of the trawl. Sampling design consisted in comparison two distinct sites, in each of them were conducted three tows with the sediment sampler device and at the begin and final of each tow it were collected sediment samples with Van Veen grab. PERMANOVA test on macrofauna composition indicated no significant difference in relation to both sampler devices. During the experiment, was not detected any problems in relation to positioning and using the new sampler. The addition of extra weight to the ballast cord did not unestablished the ...

2017 IEEE/OES Acoustics in Underwater Geosciences Symposium (RIO Acoustics)

This paper submits the results of the acoustic cruise made in the austral summer of 2016. The sur... more This paper submits the results of the acoustic cruise made in the austral summer of 2016. The survey delivers the bottom bathymetry, the geographic distribution of krill concentrations, and the presence of fish shoals in 1,500 nautical miles over the shelf and the continental slope (100–500 m), around Elephant Island and South Orkney Islands. Krill concentrations are described, as well as those of mackerel icefish (Champsocephalus gunnari), the latter representing the most abundant fish species in the research, besides other finfish species in the area. The mackerel iceflsh was found between 160 and 449 m depth, associated to steep bottom, showing demersal characteristics during the day and semi-pelagic overnight. During the darkness hours, the mean determined depth in the schools was 207.1 ± 62.6 m around Elephant Island and 219.4 ± 55.8 m in South Orkney Islands.

Latin American Journal of Aquatic Research

A research survey for demersal finfish was completed using bottom trawl fishing gear, following a... more A research survey for demersal finfish was completed using bottom trawl fishing gear, following a random stratified sampling design, between 50 and 500 m on shelf areas of subarea 48.1 (Elephant Island) and Subarea 48.2 (South Orkney Island). An acoustic survey was simultaneously carried out to enhance knowledge of bathymetry and the distribution of fish and krill in the studied area. The cruise took place between the 6 and 27 January 2018. A total of 36 hauls were carried out, 15 around Elephant Island and 21 around the South Orkney Islands. A total of 37 fish species were caught with a total biomass of 19,112 kg. The main species encountered included Notothenia rossii and Champsocephalus gunnari, with nominal catches weighing 16,204 (85%) and 876 kg (5%), respectively. Other species of fish accounted noticeably for lower amounts (11%), such as Gobionotothen gibberifrons (330 kg), Chaenocephalus aceratus (322 kg), and Pseudochaenichthys georgianus (299 kg). Indicative estimates of ...

Latin American Journal of Aquatic Research

Krill (Euphausia superba) catch is currently the most relevant fishery industry in Antarctic wate... more Krill (Euphausia superba) catch is currently the most relevant fishery industry in Antarctic waters. This resource is a keystone species in the Antarctic food web, sustaining the contribution to the trophic ecology of many invertebrate and vertebrate species. To catch krill, part of the fleet in this fishery uses large mid-water nets that also retain a diversity of other organisms like plankton, meroplankton, and fish species as bycatch. Therefore, it is necessary to understand and evaluate the magnitude of this incidental catch, as well as the potential interactions between krill fishing gear with seabirds and mammals. To estimate the composition and extent of bycatch for this fishery included 784 samples of 25 kg and an equal number of 1 kg sub-samples obtained from Antarctic krill catches in Subarea 48, between years 2012 and 2016. A total of 15 fish species were identified along with the record of five other taxa and other unidentified specimens. The most relevant fish species b...

Latin American Journal of Aquatic Research

Antarctic krill (Euphausia superba) is a key resource in the Antarctic region, as it is the prima... more Antarctic krill (Euphausia superba) is a key resource in the Antarctic region, as it is the primary food source for fish, whales, seals, flying birds, penguins and cephalopods. The high concentrations of the species and its possible uses -food for human and animal consumption and in the production of industrial, pharmaceutical and dietetic products- generates interest in the fishing industry. Its relevance motivated the implementation of administrative measures and international regulations for this fishery, which are summarized in this review. Chile is the only South American fishing country that has shown interest in participating in Antarctic krill fishery. Thus, between 1983 and 1994, the Fisheries Development Institute and some companies carried out fishing activities mainly aimed at prospecting and researching this species. However, starting in 2011, the factory trawler Betanzos began sustained commercial krill fishing aimed at krill meal production. This document analyzes the...

An understanding of host-parasite interactions represents an important, but often overlooked, axi... more An understanding of host-parasite interactions represents an important, but often overlooked, axis for predicting how marine biodiversity may be impacted by continued environmental change over the next century. For host and parasite communities in the Southern Ocean, investigations of many major groups of parasites have largely been limited to taxonomic and phylogenetic studies, creating an urgent need for the collection of baseline ecological data if we are to detect changes in host-parasite interactions in the future. Here, we survey three species of Crocodile icefish (Notothenioidei: Channichthyidae) collected from two island archipelagos in Antarctica’s South Scotia Arc region for evidence of leech infestations. Specifically, we report on infestation prevalence and intensity of three leech species (Trulliobdella bacilliformis, Trulliobdella capitis, and Nototheniobdella sawyeri) on the host fish species Chaenocephalus aceratus, Champsocephalus gunnari, and Chionodraco rastrospin...

Fisheries Research, 2016

Abstract Spatial processes are rarely considered explicitly in the evaluation and management of m... more Abstract Spatial processes are rarely considered explicitly in the evaluation and management of marine invertebrate populations. This is particularly true when larval drift acts as one of the main mechanisms of population expansion. The ecological concept metapopulation is widely used and accepted for understanding low-mobility marine populations. This study uses a length-based dynamic analysis model for nylon shrimp (Heterocarpus reedi) exploited off central Chile (25°–37°S) to contrast various hypotheses of population structure and spatial connectivity. The two subpopulations studied are located to the north and south of 32°S. The model is fitted to the historical fishery data (from the mid-1940s to the present), the results of monitoring of fishing activities (1970s-present), and research surveys (1990s-present). Statistically, several hypotheses can explain the data. The most likely hypothesis is that of a metapopulation in which the south zone acts as a source population (reproductive refuge) and determines, partially or totally, the recruits in the north zone, thereby explaining the population increase over the last decade. Empirical evidence will strengthen the hypothesis of spatial connectivity and special attention should be paid to the biological-fishery conditions recorded south of 32°S given the implications for managing the fishery for this resource.

Latin American Journal of Aquatic Research, 2016

How to cite Complete issue More information about this article Journal's homepage in redalyc.org ... more How to cite Complete issue More information about this article Journal's homepage in redalyc.org Scientific Information System Network of Scientific Journals from Latin America, the Caribbean, Spain and Portugal Non-profit academic project, developed under the open access initiative Stomatopoda and Decapoda in Chilean oceanic islands 1

Latin American Journal of Aquatic Research, 2016

Estimating the total biomass of fish stocks available for fishing at any one time can highly impr... more Estimating the total biomass of fish stocks available for fishing at any one time can highly improve the process of deciding upon sustainable fishing management measures. However, countries where fishing resources are not abundant or valuable can hardly justify a regular investment in costly direct stock assessment programs. One way of overcoming such difficulties is to use catch rate data recorded from monitored commercial fishing operations, usually made available through the implementation of less expensive Observers programs. However, this data is prone to overestimate biomass of targeted stocks, because fishermen tend to operate in high-density areas. This study addresses this issue by exploring the use of geostatistical models to estimate biomass of three slope fish stocks of the Brazilian EEZ: codling (Urophycis mystacea), hake (Merluccius hubbsi) and monkfish (Lophius gastrophysus).

Latin American Journal of Aquatic Research, Dec 1, 2008

Herein, we compare information taken from the Patagonian toothfish (Dissostichus eleginoides) fis... more Herein, we compare information taken from the Patagonian toothfish (Dissostichus eleginoides) fishery operations carried out off the far southern coast of Chile (47°00'S-57°00'S) using pots (pots) and longlines. In January 2006 and from June to October 2006, 167 fishing hauls were done, 119 using long-lines and 48 using pots. The total Patagonian toothfish catch was 60.9 tons, of which 81.2% were caught with long-lines and 18.8% with pots. On average, 5,395 hooks and 147 pots were set per haul, with average yields of 0.08 kg hook-1 and 1.43 kg pot-1. The average depth for setting the gear was 1,581 m (long-lines) and 1,318 m (pots). Significant differences were found between these two types of gear, as well as between the time of setting and the time of retrieval. Greater fishing yields were obtained from the long-line fishery operations, with significant differences between the gear types in terms of the catch per haul (kg haul-1) and the catch per length of the specimens retained (kg 1000 m-1). On average, the individuals caught with pots (110.8 cm total length) were larger than those caught with long-lines (105.1 cm total length). Nonetheless, no significant differences were recorded for the size structures. In terms of interactions with birds, during setting, no birds were observed at the trapping operations, whereas a few specimens (≤ 10 birds) were seen during only 2.5% of the long-line operations. During retrieval, birds were observed during 34.9% of the hauls with pots and 62.8% of the longline operations. The presence of mammals around the fishery operations during setting and retrieval was similar for both types of gear.

Latin American Journal of Aquatic Research, 2009

RESUMEN. Se analiza la información mensual de composición de tamaño recopilada en el monitoreo de... more RESUMEN. Se analiza la información mensual de composición de tamaño recopilada en el monitoreo de la pesca artesanal sobre cangrejo dorado (Chaceon chilensis) realizado entre julio de 2005 y mayo de 2006, para evaluar los parámetros de crecimiento, mortalidad natural y puntos biológicos de referencia de los machos sobre los cuales se basa esta pesquería. Se estableció una longevidad promedio de 20 años y una mortalidad natural en torno a M = 0,27 año-1. La talla crítica se determinó a los 110 mm de longitud cefalotorácica (Lc), que es levemente inferior a la talla de primera captura de 114 mm de Lc. De acuerdo al análisis efectuado, se explotan individuos entre 4 y 10 años de vida. Mediante análisis de equilibrio se determina que la población se encuentra en 82% de la condición virginal, que se refleja en una talla promedio en las capturas de 128 mm de Lc. Una eventual reducción de la población a un límite del 40% de la condición original, se consigue aumentando en tres veces el nivel actual de desembarques, lo que se traduciría en una talla media en las capturas de 118 mm de Lc. Finalmente, se recomiendan distintos puntos biológicos de referencia para garantizar una explotación sustentable en el tiempo. Palabras clave: crecimiento, mortalidad, evaluación, cangrejo dorado, Chaceon chilensis, archipiélago de Juan Fernández, Chile. Growth, mortality, and stock assessment of the golden crab (Chaceon chilensis) population exploited in the Juan Fernández archipelago, Chile ABSTRACT. Monthly information on the size composition of golden crab (Chaceon chilensis) catches compiled while monitoring the artisanal fishery (July 2005 through May 2006) is analyzed in order to evaluate the growth parameters, natural mortality, and biological reference points in male specimens, the basis of the fishery. Average longevity was found to be 20 years and natural mortality around M = 0.27. The critical size was determined to be around 110 mm carapace length (Lc), slightly lower than that of the first catch (114 mm Lc). According to this analysis, individuals between 4 and 10 years of age are exploited. A balance analysis revealed that 82% of the population is virginal, as reflected in an average size-at-catch of about 128 mm Lc. Tripling the current level of landings would lead to an eventual reduction to a limit of 40% of the original population; this would result in an average catch size of 118 mm Lc. Finally, several biological reference points are recommended for guaranteeing sustainable exploitation over time.

Industrias Pesqueras Revista Maritima Quincenal, 2013

Serie Cientifica Instituto Antartico Chileno, 1999

Latin American Journal of Aquatic Research, Mar 1, 2014

Fisheries Research, 2016

Abstract Two key elements in the adequate, sustained exploitation of any fishery should be consid... more Abstract Two key elements in the adequate, sustained exploitation of any fishery should be considered; the biological attributes of the species and how these vary over time and space. Research is needed to obtain a more thorough understanding of these effects, how they vary, and how they relate to environmental factors. For 17 years, biological information has been collected for Heterocarpus reedi (nylon shrimp) caught off central Chile (25–37 °S). Here, we analyze these data using generalized linear models and determine the factors responsible for changes in carapace length, body weight, maturity, and sex ratio. The environmental and alimentary conditions are better south of 32 °S, and this is probably associated with the better physical condition and reproductive attributes of H. reedi there. For example, individuals are larger, females are longer at first maturity (CL 50% ), and mature females are less prevalent. We outline a theoretical foundation that can guide future research on H. reedi . We also suggest that future conservation measures consider biological attributes within a spatial context.