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Population dynamics of the oyster Crassostrea rhizophorae from the Ciénaga Grande de Santa Marta, Colombia

By: Mancera Pineda, Jose Ernesto | Instituto de Investigaciones Marinas y Costeras, INVEMAR
Contributor(s): Mendo, Jaime Humberto
Material type: Computer fileComputer fileLanguage: English Series: Contribuciones científicas; No. 566Publisher: The Netherlands Elsevier Science Inc. 1996Subject(s): OSTREIDAE | CRECIMIENTO | MORTALIDAD | RECLUTAMIENTO | BIOMASA | FISAT | VON BERTALANFFY | ELEFANT I | PAULY´S | EXPLOTACION | BIOLOGIA PESQUERA | DINAMICA DE LA POBLACION | LAGUNAS COSTERAS | ESTUARIOS | CIENAGA GRANDE DE SANTA MARTA | COLOMBIA | CARIBEOnline resources: Click here to access online In: Fisheries Research Vol.26, No.1-2 (1996); pp.139-148Summary: Growth parameters, instantaneous mortality rates (Z, F and M), yield per recruit and biomass per recruit of the oyster Crassostrea rhizophorae were estimated using the FiSAT package, based on shell length frequency data of 2551 individuals. Von Bertalanffy growth parameters and total mortality were estimated using the ELEFANT I program and the catch curve method, respectively. Pauly's and M=2K empirical equations were used to estimate natural mortality. Values found are L =149 mm, K=0.9 year-1, ø'=4.3 and t=-0.05 year-1, respectively. Age at entry is too low because of the harvest of small oysters attached to the adults shells. Total, natural and fishing mortalities were estimated at 5.16, 2.0 and 3.16 year-1, respectively. The exploitation rate (0.6) and fishing mortality indicate that oyster is slightly overexploited due mainly to the harvest method used by fishermen rather than to the increase of effort itself. Yield per recruit could be substantially improved by returning shells to the environment.
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Growth parameters, instantaneous mortality rates (Z, F and M), yield per recruit and biomass per recruit of the oyster Crassostrea rhizophorae were estimated using the FiSAT package, based on shell length frequency data of 2551 individuals. Von Bertalanffy growth parameters and total mortality were estimated using the ELEFANT I program and the catch curve method, respectively. Pauly's and M=2K empirical equations were used to estimate natural mortality. Values found are L =149 mm, K=0.9 year-1, ø'=4.3 and t=-0.05 year-1, respectively. Age at entry is too low because of the harvest of small oysters attached to the adults shells. Total, natural and fishing mortalities were estimated at 5.16, 2.0 and 3.16 year-1, respectively. The exploitation rate (0.6) and fishing mortality indicate that oyster is slightly overexploited due mainly to the harvest method used by fishermen rather than to the increase of effort itself. Yield per recruit could be substantially improved by returning shells to the environment.

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