Los fenómenos de marea roja y toxicidad de moluscos bivalvos en el Mar Argentino

Two unusual blooms of dinoflagellates appeared in the Argentine Continental Shelf in spring/summer period of 1980 and 1981, but these differed, one from the other. The first was an intense red-tide with which were associated no signs of toxicity, whereas the second, although; not showing special coloration, was associated with (and doubtless the cause of) intense toxicity in bivalves of the Gulfs of San Matías and San José and of the shelf waters off Península Valdés; the death of two fishermen was atributed to the latter. The first bloom developed as an unusual surface concentration of the predatory dinoflagellate Noctiluca scintillans. It was supposed that this concentration was produced by a particular combination of processes of circulation of water masses. The second bloom was characterizaed by high concentrations of Gonyalax excavata. Investigations at the time determined that toxins in molluscs of the area correasponded to what is called "paralytic shellfish poison". The bloom of G. excavata was associated with a front between well mixed and well stratified water masses. The maximum toxicity centre occured in the mussel bank "Constanza" (42°23'27"S and 62°45'66"W) which coincides with the front referred to above. (PDF contains 93 pages)

SAMUDRA Report No. 57, November 2010

Mackerel mayhem: On the ongoing dispute in northern Europe over the boom in mackerel stocks. Small and mighty: The Banjul civil society declaration on sustainable livelihoods in African fisheries. Building partnerships: The case of Red Sea fisheries management shows how fishers’ rights can be strengthened. The write stuff: The website of Comité Local des Pêches Le Guilvinec celebrates its second anniversary. Frankenfish salmon: The United States is close to approving genetically engineered salmon. Trawl brawl: Indian and Sri Lankan fishermen have worked to co-exist in the Palk Bay. Tsunami recovery: On the traditional tenure system of the fishing community of Juan Fernández. New goals from Nagoya: The Nagoya meeting of the Convention on Biological Diversity made some progress. Beyond Bangkok: The civil society workshop in Costa Rica focused on small-scale fishers in Latin America. Securing small-scale fisheries. Recommendations adopted at the San José FAO workshop dealt with small-scale fisheries. (PDF contains 56 pages)