Año 1987, Número 7- 5-20

Año 1987, Número 7- 5-20

Perez Seijas, G.M.; Ramirez, F.C.; Viñas, M.D. 1987.  Variaciones de la abundancia numérica y biomasa del zooplancton de red en el Golfo San Jorge (año 1985).
Rev. Invest. Desarr. Pesq., 7: 5-20.
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A study was made on numerical and biomass variations of the zooplankton of the San Jorge Gulf (Argentina), based on samples from five cruises performed during 1985. The sampling was included within a programme for the biology and fishery evaluation of the shrimp Pleoticus muelleri. San Jorge, a large gulf of the northern patagonian shelf, comprises major fishery activities. Some fish species of economical importance depend on copepods for their feeding, like anchovy (Engraulis anchoita) or partially on middle-size plankters, like mackerel (Scomber japonicus). As a way for determining the trophic disponibility at the gulf, a study was made in order to express the numerical abundance of copepods, euphausiids and amphipods and other items of lesser importance, as well as their total biomass.