The egg production method applied to the spawning biomass estimation of sardine, Sardina pilchardus (Walb.), on the North Atlantic Spanish coast
During April-May 1988, an Egg Production Method Cruise was carried out with the purpose of evaluating the spawning biomass of the sardine, Sardina pilchardus (Walb.), from the Galician and Cantabrian coasts of Spain. This cruise was coordinated with the acoustical evaluation of this stock on board t...
| Autores: | , , , , |
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| Tipo de recurso: | artículo |
| Estado: | Versión publicada |
| Fecha de publicación: | 1992 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/328733 |
| Acceso en línea: | http://hdl.handle.net/10261/328733 |
| Access Level: | acceso abierto |
| Palabra clave: | Centro Oceanográfico de Vigo Sardine Pesquerías Evaluation Egg production Fecundity Cantabrian Sea Spain |
| Sumario: | During April-May 1988, an Egg Production Method Cruise was carried out with the purpose of evaluating the spawning biomass of the sardine, Sardina pilchardus (Walb.), from the Galician and Cantabrian coasts of Spain. This cruise was coordinated with the acoustical evaluation of this stock on board the R/V Cornide de Saavedra. The area covered extends from the Spanish-Portuguese border (41º 55' N) to the Spanish-French border (1º 58' W). Vertical plankton tows at 524 stations were distributed over the continental shelf and slope water in a 6 X 6 mile grid, with a 6 X 3 mile grid in areas of more intense spawning, to estimate the daily egg production parameter. A total of 44 epipelagic trawls were done in order to estimate the biological parameter relative to the adult population, that is, average female weight, batch fecundity, spawning fraction and sex ratio. The suruey area was post-stratified into three regions and the spawning biomass was estimated for each region. The sum of the three spawning biomass estimates was the total spawning biomass for the survey area. Three regions were established by differentiated adult parameters, such as average female weight in conjunction with the considered acoustical divisions. These regions correspond to the Galician coast (I), the western Cantabrian area (II) and the eastern sector of the Cantabrian coast (III). |
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