Distribution of Dinophysis species and their association with lipophilic phycotoxins in plankton from the Argentine Sea

Okadaic acid (OA) and its main structural analogs dinophysistoxin-1 (DTX1) and dinophysistoxin-2 (DTX2) are marine lipophilic phycotoxins distributed worldwide that can be accumulated by edible shellfish and can cause diarrheic shellfish poisoning (DSP). In order to study their toxicokinetics, mice were treated with different doses of OA, DTX1, or DTX2 and signs of toxicity were recorded up to 24 h. Toxin distribution in the main organs from the gastrointestinal tract was assessed by liquid chromatography-mass spectrometry (LC/MS/MS) analysis. Our results indicate a dose-dependency in gastrointestinal absorption of these toxins. Twenty-four hours post-administration, the highest concentration of toxin was detected in the stomach and, in descending order, in the large intestine, small intestine, and liver. There was also a different toxicokinetic pathway between OA, DTX1, and DTX2. When the same toxin doses are compared, more OA than DTX1 is detected in the small intestine. OA and DTX1 showed similar concentrations in the stomach, liver, and large intestine tissues, but the amount of DTX2 is much lower in all these organs, providing information on DSP toxicokinetics for human safety assessment.

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Seasonal stability and spatial variability of parasites in Brazilian sandperchPinguipes brasilianusfrom the Northern Argentine Sea: evidence for stock discrimination

Journal of Fish Biology ◽

10.1111/j.1095-8649.2009.02190.x ◽

2009 ◽

Vol 74 (6) ◽

pp. 1206-1225 ◽

Cited By ~ 21

Author(s):

J. T. Timi ◽

A. L. Lanfranchi ◽

J. A. Etchegoin

Keyword(s):

Spatial Variability ◽

Argentine Sea ◽

Stock Discrimination

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Capture efficiency for small dominant mesozooplankters (Copepoda, Appendicularia) off Buenos Aires Province (34ºS-41ºS), Argentine Sea, using two plankton mesh sizes

Brazilian Journal of Oceanography ◽

10.1590/s1679-87592009000300004 ◽

2009 ◽

Vol 57 (3) ◽

pp. 205-214 ◽

Cited By ~ 20

Author(s):

Rosana Di Mauro ◽

Fabiana Capitanio ◽

María Delia Viñas

Keyword(s):

Buenos Aires ◽

Developmental Stages ◽

Fish Larvae ◽

Abundant Species ◽

Accurate Estimation ◽

Buenos Aires Province ◽

Oikopleura Dioica ◽

Great Loss ◽

Argentine Sea ◽

Significant Difference

Two plankton mesh sizes of 67 µm and 220 µm were compared to evaluate their efficiency in the capture of the smallest copepods and appendicularians present in the Buenos Aires coastal area (Argentine Sea). A total of 12 copepod species and one appendicularian species were recorded in this study. The copepods were separated into 4 groups: harpacticoids, cyclopoids, small calanoids and large calanoids and their developmental stages. Among the cyclopoids, Oithona nana was the most abundant species, being 96.29 % underestimated by the 220 µm mesh, whereas Microsetella norvegica dominated the harpacticoids and was captured exclusively by the smaller mesh. Similar results were found for copepodites I-III of small calanoids, whose net sampled underestimation reached 99.70%. On the other hand, no significant difference between meshes was found for adults and copepodites IV-V of small calanoids or any of the developmental stages of large calanoids. A great loss of biomass was observed for O. nana when applying the larger mesh. In regards to the appendicularian Oikopleura dioica, all size ranges below 1,000 µm length were better estimated by the 67 µm mesh in terms of abundance and biomass. Our results clearly show that the 67 µm mesh was more efficient in the capture of early stages of small copepods thus providing a more accurate estimation of the fish larvae prey field.

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Shark fisheries in Argentina

Marine and Freshwater Research ◽

10.1071/mf97136 ◽

1998 ◽

Vol 49 (7) ◽

pp. 601 ◽

Cited By ~ 30

Author(s):

Gustavo E. Chiaramonte

Keyword(s):

Fishing Effort ◽

Population Trends ◽

The South ◽

Gill Nets ◽

Argentine Sea ◽

Commercial Importance ◽

South West ◽

Gill Net ◽

Galeorhinus Galeus ◽

Mustelus Schmitti

In the Argentine Sea there are about 35 species of sharks. Three species are subjected to directed fishing: the smoothhound Mustelus schmitti, the school shark Galeorhinus galeus and the copper shark Carcharhinus brachyurus. Other species of elasmobranchs with commercial importance are the angel shark Squatina spp. and several species of skates and rays. The rise in chondrichthyan declared landings registered from 1988 to 1996 is due to the increase in landings of smoothhound and rays. The most important directed shark fishery in the South-West Atlantic is the Necochea gill-net fishery for school shark, which is carried out by the coastal fleet; details are given of the ships and the gill-nets used in this area. The length frequencies of the catches by gill-nets are presented for the school shark; fishing effort (length (km) of net in the water per ship per day) and CPUE (number of sharks per fishing effort) were found not to be good indicators of population trends in the school shark fishery. Resumen. En el Mar Argentino se han registrado 35 especies de tiburones. Tres de estas especies están sometidas a una pesca dirigida; el gatuzo, Mustelus schmitti, el cazón, tiburón vitamínico o trompa de cristal, Galeorhinus galeus y la bacota, Carcharhinus brachyurus. Otras especies de elasmobranquios de importancia comercial son el pez ángel Squatina spp. y algunas especies de rayas. El incremento en los desembarcos de condríctios declarados a las autoridades pesqueras entre 1988 y 1996 es debido principalmente al incremento del desembarco de gatuzo y rayas. La pesquería dirigida a tiburón más importante en el Atlántico Sudoccidental es la pesquería costera de enmalle de Necochea para el cazón. Se describen el largo de las embarcaciones y las redes utilizadas en el área (la medida de malla, el calado y la operación del arte de pesca). Se presenta la frecuencia del largo total de las capturas de cazón en redes de enmalle. Se halló para la pesquería del cazón que el esfuerzo pesquero (estimado como km de red en el agua por embarcación por día) y la CPUE (estimada como tiburones/esfuerzo de pesca) no son buenos indicadores de la tendencia en la abundancia poblacional.

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Seasonal succession of zooplankton in coastal waters of the Argentine Sea (Southwest Atlantic Ocean): prevalence of classical or microbial food webs

Marine Biology Research ◽

10.1080/17451000.2012.745003 ◽

2013 ◽

Vol 9 (4) ◽

pp. 371-382 ◽

Cited By ~ 12

Author(s):

María Delia Viñas ◽

Rubén Mario Negri ◽

Georgina Daniela Cepeda ◽

Daniel Hernández ◽

Ricardo Silva ◽

...

Keyword(s):

Atlantic Ocean ◽

Food Webs ◽

Coastal Waters ◽

Seasonal Succession ◽

Southwest Atlantic ◽

Argentine Sea ◽

Microbial Food Webs

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Records of regalecid fishes in Argentine waters

Zootaxa ◽

10.11646/zootaxa.2509.1.5 ◽

2010 ◽

Vol 2509 (1) ◽

pp. 62

Author(s):

ANA E. RUIZ ◽

ATILA E. GOSZTONYI

Keyword(s):

Fish Fauna ◽

Morphological Data ◽

Body Measurements ◽

Meristic Characters ◽

Argentine Sea ◽

The Pacific

The first two specimens of Regalecus glesne Ascanius, 1788, collected in the Argentine Sea, at Playa Unión beach, 43º 18' S, 65º 02' W are reported. Body measurements, meristic characters and morphological data are given. The most important differences with two other regalecid species, R. russelii Cuvier and R. kinoi Castro-Aguirre et al. 1991, from the Pacific coasts of Mexico, are considered. Also, a specimen caught at 43° 03’ S, 59° 14’ W, at 993 m depth, previously identified as Agrostichthys sp. is rediagnosed as Agrostichthys parkeri Benham, 1904. The distribution of R. glesne is extended to the Argentine Sea, adding a regalecid species to its fish fauna.

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