INIDEP Inf. Téc. 2: 23-33, 1994

INIDEP Inf. Téc. 2: 23-33, 1994

Biomasa y composición del zooplancton de interés trófico pesquero en áreas del Atlántico Sudoccidental. Campaña H-09/92, 45°30′ – 52°00’S, noviembre 1992.

Autores: Nora C. Fernández Aráoz y María Delia Viñas.
Contribución INIDEP 907


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Citar como:
Fernández Aráoz, N.C.; Viñas, M.D. 1994. Biomasa y composición del zooplancton de interés trófico pesquero en áreas del Atlántico Sudoccidental. Campaña H-09/92, 45°30′ – 52°00’S, noviembre 1992. INIDEP Informe Técnico 2, 23-33. Disponible en: http://hdl.handle.net/1834/6986.

Summary

Abundance and composition of zooplankton preys in the main fishing grounds off Argentina. Cruise: H-09/92, 45°30’S – 52°S, November 1992. This paper studies the mesozooplankton and macrozooplankton biomasses shelf distributions and their composition, during a spring survey. Samples were obtained by a Nackthai sampler. Wet weight biomasses were determined by direct weighing for each fraction. Mesozooplankton biomass ranged between 16 and 3600 mg. m-3, and the highest values (200 mg.m-3) were recorded between 47° and 50°S, at intermediate shelf. As a trend, biomass increased from coastal to offshore. A similar pattern was observed for the abundance, dominated by copepods (Drepanopus forcipatus and Calanus sp.) Macrozooplankton biomass ranged between 5 and 116 mg.m-3. The highest values were also recorded at intermediate shelf (50 mg.m-3) between 48° and 50°30’S. Abundance distribution showed a similar pattern, and eufausid (Euphausia spp.) and amphipods (Themisto gaudichaudii) alternated their dominance.