Evaluación de la merluza (Merluccius hubbsi) en julio y agosto de 1994, entre 34º y 36ºS del Atlántico sudoccidental.
This report contains the objectives, data collected and results from a hake assessment survey carried out in the Argentine Sea between 34° and 46° S, during July and August 1994, on board of the R/Vs "Dr. E. L. Holmberg" and "Cap. Oca Balda". The main objectives of the survey were: 1) to estimate total biomass and total abundance per age class; 2) to study the size and age composition; 3) to define the maturity ogive per size and age; 4) to quantitatively determine cannibalism and predation indexes. The area covered by the survey where 149 trawls and 184 oceanographic stations were performed was close to 100,440 nm2 . Hake biomass between 34° and 46° S was estimated in 1,105,284 tons and the confidence interval at 95. was ± 23.12. . Most of the biomass corresponded to the area between 41° and 46° S. It was estimated in 737,435 tons and it represented 67. of the total biomass. The abundance of the area between 34° and 41° S was 367,847 tons (33 ). The "Common Fishing Zone" biomass was 230,618 tons (21. ). Two concentration areas were found: one between 35° - 36° S° with a large presence of individuals smaller than 35 cm (60 to 90. and a second between 42° and 44° S with densities of up to 165 and 82 tons/nm2 respectively. The first area showed an unimodal length structure and the second showed a bimodal one. Hydrographic characteristics were normal for the period, shelf-waters were homogeneous in temperature and the Malvinas waters restricted to the continental slope.
| Main Authors: | , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | Spanish / Castilian |
| Published: |
Mar del Plata: Instituto Nacional de Investigacion y Desarrollo Pesquero
2000
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| Subjects: | Stock assessment, Biomass, Population structure, Abundance, Fishery surveys, |
| Online Access: | http://hdl.handle.net/1834/2591 |
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| Summary: | This report contains the objectives, data collected and results from a hake assessment survey carried out in the Argentine Sea between 34° and 46° S, during July and August 1994, on board of the R/Vs "Dr. E. L. Holmberg" and "Cap. Oca Balda". The main objectives of the survey were: 1) to estimate total biomass and total abundance per age class; 2) to study the size and age composition; 3) to define the maturity ogive per size and age; 4) to quantitatively determine cannibalism and predation indexes. The area covered by the survey where 149 trawls and 184 oceanographic stations were performed was close to 100,440 nm2 . Hake biomass between 34° and 46° S was estimated in 1,105,284 tons and the confidence interval at 95. was ± 23.12. . Most of the biomass corresponded to the area between 41° and 46° S. It was estimated in 737,435 tons and it represented 67. of the total biomass. The abundance of the area between 34° and 41° S was 367,847 tons (33 ). The "Common Fishing Zone" biomass was 230,618 tons (21. ). Two concentration areas were found: one between 35° - 36° S° with a large presence of individuals smaller than 35 cm (60 to 90. and a second between 42° and 44° S with densities of up to 165 and 82 tons/nm2 respectively. The first area showed an unimodal length structure and the second showed a bimodal one. Hydrographic characteristics were normal for the period, shelf-waters were homogeneous in temperature and the Malvinas waters restricted to the continental slope. |
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