INIDEP Inf. Téc. 21: 55-66, 1998

INIDEP Inf. Téc. 21: 55-66, 1998

Abundancia relativa y distribución de tallas de corvina rubia Micropogonias furnieri y pescadilla de red Cynoscion striatus en la Zona Comun de Pesca Argentino-Uruguaya y en el Rincón. Noviembre, 1994.

Autores: Claudia R. Carozza y Carmen P. Cotrina.
Contribución INIDEP 1062


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Citar como:
Carozza, C.R.; Cotrina, C.P. 1998. Abundancia relativa y distribución de tallas de corvina rubia Micropogonias furnieri y pescadilla de red Cynoscion striatus en la Zona Comun de Pesca Argentino-Uruguaya y en el Rincón. Noviembre, 1994. INIDEP Informe Técnico 21, 55-66. Disponible en: http://hdl.handle.net/1834/2472.

Summary

Relative abundance and length distribution of white croaker Micropogonias furnieri and striped weakfish Cynoscion striatus in the Argentine-Uruguaya Common Fishing Zone and El Rincón. Noviembre, 1994. The study aims to discriminate juvenile and adult concentration areas of white croacker Micropogonias furnieri and striped weakfish Cynoscion striatus in two different areas: Argentine-Uruguayan Common Fishing Zone (AUCFZ) and El Rincón (Buenos Aires Prov., Argentina). The length structure and the relative abundance of these two species were analyzed with data from a research cruise carried out by R/V Dr.E.L.Holmberg during November 1994. Data of relative abundance in t/nm2 were considered to define distribution and concentration areas. 49 samples of white croaker and 41 striped weakfish from AUCFZ and 21 and 35 from El Rincón, respectively, were studied for the analysis of the length structure, grouping the hauls according to proximity, density and lenght range. These groups were weighted to the total catch. The densities of white croaker were greater in the AUCFZ than in El Rincón. In the first area the maximum value of density was found in the argentine coast, inside the area of Río de la Plata and in front of Montevideo coast, at depths lesser than 8 meters, while the adults were located in the northern coast of Uruguay, at depths greater than 20 meters. The density of white croaker oscillated between 0.7 and 8 t/nm2 and juveniles were absent in El Rincón. The most important concentration area of striped weakfish extends from Punta del Este to El Chuy (AUCFZ), with densities from 16 to 97 t/mn2, corresponding to juveniles with bimodal length distribution. In El Rincón, the greater relative abundance was found in front of Bahía Blanca, where 65.3 percent corresponded to juveniles.