Tania Mendo - Academia.edu (original) (raw)

Papers by Tania Mendo

Frontiers in Animal Science

Decapods have been recently classified as sentient beings in UK policy and therefore the establis... more Decapods have been recently classified as sentient beings in UK policy and therefore the establishment of humane methods for the live transportation and slaughter of commercially valuable shellfish as well as for decapods used in research is critical. Formerly overlooked, the use of anaesthetics provides a promising avenue for improving welfare standards for husbandry and slaughter for decapod crustaceans destined for human consumption or research. In particular, clove oil and its derivatives (eugenol and isoeugenol) have been trialled and recommended in literature as naturally-derived and effective, reversible anaesthetic compounds for a variety of decapods, including two commercially important British shellfish, brown crab (Cancer pagurus) and Norway lobster (Nephrops norvegicus). Further investigations should be undertaken to confirm the use of such anaesthetics is suitable for improving welfare standards in the British shellfish sector and in research to ensure that when the leg...

PLOS ONE

This study analyses the bycatch composition of an artisanal shrimp trawl fleet operating between ... more This study analyses the bycatch composition of an artisanal shrimp trawl fleet operating between Cabo Blanco and Máncora in Northern Peru between April 2019 and March 2020. A total of 300 hauls were analysed with respect to target catch and bycatch (consisting of other commercial species, discards, and macroalgae). A total of 277 species were recorded including 111 species of fish, 65 species of molluscs, 51 species of crustaceans, 22 species of algae, 12 species of cnidarian, 9 species of echinoderms, 4 species of Bryozoa and 3 species of polychaeta. Capture per unit effort (CPUE, kg.h-1) was highest for fish, followed by crustaceans, algae and molluscs. The target species Penaeus californiensis coffee shrimp constituted 17.8% of the overall catch,82.2% represented bycatch, and 50.6% represented discards. Coffee shrimps were more abundant in June and November 2019 and in January and February 2020. Highest bycatch CPUE occurred in May, June and December 2019. The most abundant speci...

Springer International Publishing eBooks, 2023

CERN European Organization for Nuclear Research - Zenodo, Nov 3, 2022

Breaking the cycle of small-scale fisheries data collection Despite their prevalence in European ... more Breaking the cycle of small-scale fisheries data collection Despite their prevalence in European and Atlantic waters, knowledge of best-practice methods of data collection in SSF is currently lacking. This has led to the collection of data that is often incomplete or of poor quality, and that underplays the fisheries’ wider importance. Furthermore, the diversity of gear, target species, seasonality, and geographical range seen across SSF fleets means that methodologies for monitoring typically used in large-scale fisheries often require specific adaptations to render them fit for purpose. CABFishMan has produced a comprehensive overview of the various methodologies, census, and sampling approaches available for use in SSF, with an evaluation of the advantages and disadvantages of each, and recommending best practice. Additionally, the overview draws upon case studies from European countries (Spain, France and the United Kingdom, among others) to explore how innovative technology can...

Marine Alliance for Science and Technology for Scotland (MASTS), 2019

Publisher PD

Marine Policy, 2021

All aspects of fish supply chains have been severely affected by the COVID-19 pandemic, with jobs... more All aspects of fish supply chains have been severely affected by the COVID-19 pandemic, with jobs, income and food security at risk. In Peru, small scale fisheries are fundamental for food security, contributing to about 2/3 of all fish consumed nationally. One of the most important resources which is more affordable for local and regional consumption is hake (Merluccius gayi peruanus). This study is a first attempt to describe the small-scale hake fishery value chain and to quantify the impact of COVID-19 from March to August 2020 in two fishing communities in northern Peru. The levels of fishing and primary buying were the most affected, and we estimate that ~ 23,000 fishing trips were not conducted, ~ 1680 t of hake was not landed (83% decrease), and 620 jobs were negatively impacted during this period. The gross income of vessel owners and primary buyers decreased by ~ $US 913,000. Marked differences were observed in the way each community responded to the pandemic and in their resilience to cope with COVID-19, despite being located less than 10 km away. In El Ñ uro, which relied more heavily on the international market for hake trade, the value chain was affected for longer, while in Los Ó rganos which supplied national markets, the chain was restored after an initial period of adjustment. Our study suggests that government efforts should focus on facilitating a formalisation process in all levels of the chain, develop indicators to monitor the resumption of activities and the inclusion of a value chain approach to smallscale fisheries management.

ICES Journal of Marine Science, 2019

Analysis of data from vessel monitoring systems and automated identification systems in large-sca... more Analysis of data from vessel monitoring systems and automated identification systems in large-scale fisheries is used to describe the spatial distribution of effort, impact on habitats, and location of fishing grounds. To identify when and where fishing activities occur, analysis needs to take account of different fishing practices in different fleets. Small-scale fisheries (SSFs) vessels have generally been exempted from positional reporting requirements, but recent developments of compact low-cost systems offer the potential to monitor them effectively. To characterize the spatial distribution of fishing activities in SSFs, positions should be collected with sufficient frequency to allow detection of different fishing behaviours, while minimizing demands for data transmission, storage, and analysis. This study sought to suggest optimal rates of data collection to characterize fishing activities at appropriate spatial resolution. In a SSF case study, on-board observers collected Gl...

Reviews in Fish Biology and Fisheries, 2022

About a third of all marine fish in the world are caught in Small-Scale Fisheries (SSF). SSF are ... more About a third of all marine fish in the world are caught in Small-Scale Fisheries (SSF). SSF are increasingly recognised as essential for food security and livelihoods for vulnerable and economically fragile communities globally. Although individual SSF vessels are usually perceived as having little impact on the ecosystem, the cumulative impact of gear type and number of vessels may be substantial. Bottom trawling is a common fishing method that can greatly influence the marine ecosystem by damaging the seafloor and generating high levels of discards. However, appropriate sampling coverage using on-board observer programmes to collect these data from SSF are rare, as they are expensive and pose logistical constraints. A mobile App was used to assess whether self-reporting by fishers could provide reliable fine-scale information on fishing effort and discards over time in an illegal shrimp trawling fishery in northern Peru. Maps depicting the spatial distribution of trawling effort ...

We provide a sample dataset of movement data collected every 60sec from 5 trips by 5 different sm... more We provide a sample dataset of movement data collected every 60sec from 5 trips by 5 different small scale fishing vessels using creels. The locations have been modified to protect fisher anonymity so if you plot these tracks on a map some of them may be on land. These data are used to compare five different methods for identifying hauling versus non-hauling activities in small scale fishing vessels from their movement trajectories. The different methods are described in detail in the main text of the paper and code to implement them is provided in the paper's Supplementary Material S2 document

Environmental Science & Policy, 2022

PLOS ONE, 2016

The southern rock lobster (Jasus edwardsii) industry in Australia favours red lobsters, which are... more The southern rock lobster (Jasus edwardsii) industry in Australia favours red lobsters, which are usually caught in shallow waters, over paler (brindle) lobsters. This preference is driven partly by the Chinese market, where red is associated with luck and prosperity, and additionally, by the widely held perception within the industry that brindles have greater mortality rates during out of water transport than reds. Limited scientific evidence supports these industry observations; however, these studies did not evaluate the initial condition of lobsters. This study aimed first, to determine which variables better describe condition in J. edwardsii and second, to compare condition among lobsters in several sites around Tasmania at the typical time of high transport mortality. Male lobsters were collected from the South West, South East, East and North coast of Tasmania in late November/December 2014, which correspond to the start of the Tasmanian fishing season. A comprehensive condition assessment was applied by measuring tissue proximal composition, Brix index, Total Haemocyte Count, pH, haemocyanin and another 16 haemolymph parameters of interest. A useful framework to compare condition in J. edwardsii was established by first, using Brix index as a measure of nutritional condition, second, using pH, magnesium, and bicarbonate to evaluate differences in physiological condition and finally, using THC counts as a proxy for lobster health condition. Lobsters from different sites had different nutritional, physiological and health condition, consistent with industry observations, however our results indicate that some red shallow water lobsters exhibited poorer nutritional and health condition, while some deep water brindle lobsters were in good condition. Differences in condition could not be directly associated to catch depth of lobsters and was related to other spatially discrete factors which sometimes vary over distances <3 km.

Marine and Fishery Sciences (MAFIS)

Piura es una región del norte de Perú que destaca por su pesca artesanal, su industria procesador... more Piura es una región del norte de Perú que destaca por su pesca artesanal, su industria procesadora y exportadora de productos para consumo humano directo (CHD) y su gastronomía marina. Usando información primaria y secundaria, se caracterizó la cadena de valor de la actividad pesquera regional durante el 2014 y se estimaron indicadores de producción, valor agregado (VA) y empleo. El desembarque de Piura fue de 732.000 t y generó U$D 1.771 millones en ingresos, U$D 700 millones de valor agregado y 49.000 empleos. Las capturas fueron destinadas principalmente a: (1) la elaboración industrial y exportación de productos de CHD, preferentemente suministrados por la pesca artesanal (82% del desembarque, 59% del VA y 46% del empleo), y (2) el suministro de recursos frescos para el consumo doméstico (13% del desembarque, 37% del VA y 52% del empleo). Esta región no sigue el patrón nacional, caracterizado por una gran extracción industrial de anchoveta para la producción y exportación de har...

Supplementary figures including a map of the study area, true distribution of vessel speeds for e... more Supplementary figures including a map of the study area, true distribution of vessel speeds for each fishing activity, examples of reasons for false classifications of locations as hauling, and the relationship between vessel length and classification error rate.

Establishing fine-scale industry based spatial management and harvest strategies for the commerci... more Establishing fine-scale industry based spatial management and harvest strategies for the commercial scallop fishery in South East Australia.