Estimación de la fecundidad del langostino argentino Pleoticus muelleri Bate, 1888 de Patagonia (sur de Argentina)
Fecundity o/the Argentine red shrimp Pleoticus muelleri Bate, 1888 was estimated stereologically, and its relationship to carapace length and body weight was analysed. Samples from the spawning grounds located in the southern Gull of San Jorge (Southwest Atlantic, 47° S) collected during the peak an...
| Autores: | , , |
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| Formato: | artículo |
| Fecha de publicación: | 2001 |
| País: | España |
| Recursos: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/325901 |
| Acesso em linha: | http://hdl.handle.net/10261/325901 |
| Access Level: | acceso abierto |
| Palavra-chave: | Pleoticus muelleri Pesquerías langostino argentino Atlántico sudoccidental Patagonia Fecundidad |
| Resumo: | Fecundity o/the Argentine red shrimp Pleoticus muelleri Bate, 1888 was estimated stereologically, and its relationship to carapace length and body weight was analysed. Samples from the spawning grounds located in the southern Gull of San Jorge (Southwest Atlantic, 47° S) collected during the peak and at the end of the spawning season were also compared. Moreover, a sample of large females obtained near the city of Rawson (43° 20' S) was included. Observations of the ovocyte diameter distributions showed the existence of two main generations of ovocytes before spawning (undeveloped and ripe). Potential fecundity, defined as the number of yolked ovocytes, ranged from 72 000 to 1 000 000 ova for females with a carapace length of 25 to 55 mm. The relationships fecundity vs body weight and fecundity vs carapace length estimated for females collected in the Gulf of San Jorge and off Rawson showed a better fit to the power model. Mean relative fecundity was 10 444 ovocytes/g body weight (s = 2 150). Production of eggs was found to decrease significantly by the end of the spawning, season, both in terms of lower individual fecundity and of the increase in atretic processes (20 % o/ ripe ovaries with ova undergoing resorption). |
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