Aurélia Saraiva | Universidade do Porto (original) (raw)

Papers by Aurélia Saraiva

Bulletin of The European Association of Fish Pathologists, Jun 10, 1996

Folia parasitologica, 1998

The nematode Rhabdochona anguillae Spaul, 1927, a specific intestinal parasite of the European ee... more The nematode Rhabdochona anguillae Spaul, 1927, a specific intestinal parasite of the European eel, Anguilla anguilla (L.), is redescribed and illustrated from specimens collected from eels of the Sousa River, northern Portugal (prevalence 20%, intensity 2-13). The species is characterized by the presence of 14 anterior teeth in the prostom, small non-bifurcate deirids, absence of lateral preanal papillae, by the length (0.460-0.660 and 0.130-0.150 mm) and the shape of spicules, fairly large (0.041-0.054 x 0.025-0.030 mm) mature eggs without filaments, and by the bluntly pointed to rounded tip of the tail. Its morphological features are discussed in relation to other congeneric species. This nematode has hitherto been recorded only from eels in southern Europe (Portugal, Spain, Bulgaria).

Journal of Helminthology, Jun 30, 2015

Blue jack mackerel,Trachurus picturatus,is a carangid fish which constitutes an important commerc... more Blue jack mackerel,Trachurus picturatus,is a carangid fish which constitutes an important commercial resource in the north-east Atlantic. Its metazoan parasite community from Portuguese mainland waters was investigated here for the first time. Nine parasite taxa were found, most of which are common parasites ofTrachurusspp. The parasite community was broadly similar to that of the Atlantic horse mackerel,T. trachurus, from the same region, but two digenean species were detected in blue jack mackerel,Monascus filiformisandTergestiasp., which did not occur in horse mackerel from this region. A comparison with the two previous studies ofT. picturatusparasite communities shows that continental-shelf regions are characterized by higher prevalences of digenean trematodes and an absence of trypanorhynch cestodes, in contrast with oceanic regions.

Folia Parasitologica

Myxozoan parasites of the genus Kudoa Meglitsch, 1947 are associated with post-mortem tissue degr... more Myxozoan parasites of the genus Kudoa Meglitsch, 1947 are associated with post-mortem tissue degradation that causes great financial losses to commercial fisheries. Kudoa thyrsites (Gilchrist, 1924) is a species with a very wide host range including commercial tunas, mackerels, salmonids and flatfishes. A sample of 190 fishes of 18 species from the Madeira Archipelago and 30 Atlantic chub mackerel, Scomber colias Gmelin, and 30 blue whiting, Micromesistius poutassou (Risso), from the Portuguese mainland coast were examined for the presence of species of Kudoa. The prevalence of Kudoa spp. was 80% in M. poutassou and 60% in S. colias. No spore was detected in S. colias from Madeira, which was confirmed by specific PCR screening of the muscle from all individuals of S. colias. SSU rDNA analysis revealed that M. poutassou and S. colias from the Portuguese mainland coast were infected with K. thyrsites, an economically important myxozoan parasite. Both sequences were identical with sequences of the eastern Atlantic K. thyrsites genotype, including that from the type host of this parasite. This is the first report of K. thyrsites from M. poutassou and S. colias. The fact that spores of species of Kudoa were not detected in fishes screened in the Madeira Archipelago may be explained by various ecological factors, such as the absence of a continental shelf, a short insular shelf, and oceanic waters with low productivity, all resulting in reduced abundance of benthic organisms. Consequently, it is possible that as yet unknown annelid definitive hosts of Kudoa spp. are absent or very rare near Madeiran coasts.

Systematic Parasitology, Mar 28, 2018

A synopsis of the species of Ceratomyxa Thélohan, 1892 (Cnidaria, Myxosporea, Ceratomyxidae) desc... more A synopsis of the species of Ceratomyxa Thélohan, 1892 (Cnidaria, Myxosporea, Ceratomyxidae) described between 2007 and 2017 is presented, including 83 nominal species. For each species, the most important morphological and morphometric features are indicated in tabulated format. Included are also the site of infection within the host, and geographical location, plus a full bibliography of the original records of species. Molecular data (GenBank accession numbers) are also provided whenever possible.

Systematic Parasitology, 2012

A synopsis of the species of Chloromyxum Mingazinni, 1890 (Myxozoa: Myxosporea: Chloromyxidae) is... more A synopsis of the species of Chloromyxum Mingazinni, 1890 (Myxozoa: Myxosporea: Chloromyxidae) is presented, including 140 nominal species. For each species the most relevant morphological and morphometric characteristics are indicated. Included are data on the site of infection within the host, the original host and the host locality, plus a full bibliography of the original records for these species. A diagrammatic illustration of a spore of each species is also provided.

Diseases of Aquatic Organisms, 2018

Amberjacks, Seriola spp., are a group of carangid fishes of economic importance for fisheries and... more Amberjacks, Seriola spp., are a group of carangid fishes of economic importance for fisheries and aquaculture worldwide. A survey of the parasites of greater amberjack S. dumerili and almaco jack or longfin yellowtail S. rivoliana from the Madeira archipelago (including the Madeira and Selvagens Islands) was carried out. This work is the first parasitological study of these 2 species in the Eastern Atlantic. A total of 14 parasite taxa were detected in the 47 fish analysed: Allencotyla mcintoshi, Stephanostomum petimba, Rhadinorhynchus sp. and Caligus aesopus (in both Seriola spp.); Dionchus agassizi, Zeuxapta seriolae, Tormopsolus orientalis, Didymocystis sp. and Anisakis sp. (in S. rivoliana); Tetrochetus coryphaenae, Stephanostomum sp., S. ditrematis, Oncophora melanocephala and Hysterothylacium seriolae (in Seriola dumerili). The monogenean Dionchus agassizi and the nematode O. melanocephala constitute new host records for the genus Seriola, and the species Allencotyla mcintoshi, Z. seriolae, Tormopsolus orientalis, H. seriolae, and C. aesopus are reported in the region of Madeira for the first time. Some of the parasites detected, in particular Z. seriolae and C. aesopus, could constitute a threat to amberjack aquaculture, and measures should be taken to prevent their introduction into sea cages.

Systematic Parasitology, 2006

A synopsis of the species of Ceratomyxa The´lohan, 1892 (Myxozoa: Myxosporea: Ceratomyxidae), inc... more A synopsis of the species of Ceratomyxa The´lohan, 1892 (Myxozoa: Myxosporea: Ceratomyxidae), including a total of 147 species, is presented. For each species the relevant morphological and morphometric data are indicated, as well as the site of infection within the host and the original hosts and locality. A diagrammatic illustration of the spores is also provided.

Fishes in Mediterranean Environments, 2016

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Bulletin- European Association of Fish Pathologists

Journal of Helminthology, 2015

A severe case of ceroid deposition was observed in the kidney of a small number of feral Oncorhyn... more A severe case of ceroid deposition was observed in the kidney of a small number of feral Oncorhynchus mykiss from Alicura impoundment, Argentinian Patagonia. The pigments were observed intracellularly in the kidney tubules and in the parenchyma cells, varying from a large number of small droplets to one big droplet almost filling the cell and pushing the cytoplasm to one side of the cell. An extensive study of farmed fish, as well as wild specimens from the same impoudment, did not show any ceroid deposition. Further, no abnormal mortality rates were observed in the farms. The mechanism that caused this condition in just a small number of fish is not known.

Fisheries Research, 2019

A sample of 128 skipjack tuna Katsuwonus pelamis from Madeira archipelago was the subject of a pa... more A sample of 128 skipjack tuna Katsuwonus pelamis from Madeira archipelago was the subject of a parasitological analysis, in order to identify seasonal patterns of parasite infection which can provide information regarding the migratory patterns of skipjack tuna in the Eastern Atlantic. A total of 24 parasite taxa were detected. The nematode Oncophora melanocephala (Nematoda: Camallanidae) was identified as a first record for the genus Katsuwonus and several species were detected for the first time in the Eastern Atlantic, including the didymozoid trematode Pozdnyakovia gibsoni (Trematoda: Didymozoidae), originally described in skipjack tuna from Brazil. Generalized Linear Modelling (GLM) analysis revealed season and host fork length as the main predictors of parasite abundance, uncovering seasonal patterns of infection that indicate that migration to waters around Madeira occurs in at least two separate stages, and suggests a mixing of skipjack tuna sub-populations from both sides of the Atlantic. Recently, a study of the parasite community of skipjack tuna in Madeira uncovered high species richness, with a predominance of didymozoid trematodes (Hermida et al., 2018). This study corroborated

Folia parasitologica, Jan 20, 2017

Species of the cnidarian genus Henneguya Thélohan, 1892 (Myxosporea: Myxobolidae) are histozoic p... more Species of the cnidarian genus Henneguya Thélohan, 1892 (Myxosporea: Myxobolidae) are histozoic parasites commonly found in freshwater and, more rarely, in marine fish. The development of these parasites in fish tissues includes the formation of plasmodia within which occurs the sporogony originating spores with two caudal processes, which are usually randomly distributed within the plasmodia. In this report the authors present some cases of non-random distribution of the spores of six species of Henneguya within their plasmodia. Two different patterns of non-random distribution were found based on a literature survey. These patterns and their origin are discussed. Apparently this non-random distribution of the spores is due to both internal and external factors.

Journal of Helminthology, 2012

A study was carried out on the gastrointestinal helminth communities of blackspot seabream, Pagel... more A study was carried out on the gastrointestinal helminth communities of blackspot seabream, Pagellus bogaraveo, from the Portuguese mainland and island waters. Fifteen helminth parasite species were detected, including the following new records in this host: the digeneans Accacladocoelium petasiporum, Brachyenteron helicoleni,Glomericirrus macrouri, Lecithocladium excisum, Lepocreadium album and Pachycreadium carnosum; the nematode Camallanus sp. and the acanthocephalan Rhadinorhynchus pristis. Infection levels were generally low. Samples from mainland waters had a significantly higher prevalence of digeneans than those from the islands, probably due to the greater availability of invertebrate intermediate hosts on the continental slope. The helminth community of P. bogaraveo from Azores was diverse but mostly composed of species that infected no more than a single host, whereas in Madeira the helminth community was very depauperate. Most helminth species exhibited niche preferences...

Toxins, 2022

Photobacterium damselae subsp. piscicida (Phdp) is a Gram-negative bacterium that infects a large... more Photobacterium damselae subsp. piscicida (Phdp) is a Gram-negative bacterium that infects a large number of marine fish species in Europe, Asia, and America, both in aquacultures and in the natural environment. Among the affected hosts are economically important cultured fish, such as sea bream (Sparus aurata), sea bass (Dicentrarchus labrax), yellowtail (Seriola quinqueradiata), and cobia (Rachycentron canadum). The best characterized virulence factor of Phdp is the Apoptosis-Inducing Protein of 56 kDa (AIP56), a secreted AB-type toxin that has been shown to induce apoptosis of sea bass phagocytes during infection. AIP56 has an A subunit that displays metalloprotease activity against NF-kB p65 and a B subunit that mediates binding and internalization of the A subunit in susceptible cells. Despite the fact that the aip56 gene is highly prevalent in Phdp isolates from different fish species, the toxicity of AIP56 has only been studied in sea bass. In the present study, the toxicity o...

The examination of gills from 240 fish from Paraná river, Brazil, showed the presence of small cy... more The examination of gills from 240 fish from Paraná river, Brazil, showed the presence of small cysts in five fish species. Observation of the cysts showed they are plasmodia of Henneguya spp. (Myxozoa, Myxosporea, Myxobolidae). The morphometric and morphologic characteristics of the parasites are described.

Frontiers in Water-Energy-Nexus—Nature-Based Solutions, Advanced Technologies and Best Practices for Environmental Sustainability, 2019

Electro-Fenton technology was able to decrease zebrafish embryotoxicity of fluoxetine and pirimic... more Electro-Fenton technology was able to decrease zebrafish embryotoxicity of fluoxetine and pirimicarb, when single or in mixture.

Folia Parasitologica, 1997