Growth and mortality of Cachana (Cynopotamus atratoensis) in the cienaga Grande de Lorica, Colombia

Growth and mortality of Cachana (Cynopotamus atratoensis) in the cienaga Grande de Lorica, Colombia

ABSTRACT

Objective. Growth and mortality parameters of Cachana Cynopotamus atratoensis Eigenmann, 1907 in the cienaga Grande de Lorica, Sinu river basin, Colombia, were estimated. Materials and methods. The length frequency analysis to the information collected between January 2001 to December 2002, was applied. Results. The estimated values for asymptotic length, growth rate and age at zero length were 43.4 (±0.52) cm of total length, 0.29 (±0.02) year-1 and -0.53 years, respectively. Total mortality was estimated at 0.97 year-1, natural mortality at 0.72 year-1, fishing mortality at 0.25, the average catch size was 24.8 cm total length, being fully recruited to the fishery with 16.6 cm total length, with low exploitation rate (E: 0.26). Conclusions. Cachana is a fish with medium longevity and growth rate with low exploitation rate, suggesting that there is still no overfishing on the species. However, as it is an very important fish in the food security of fishermen and their families, its necessary to increase the basic biology research pointing to the management and conservation of the species in the cienaga and the Sinu basin.

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