Crecimiento y mortalidad del ostión de roca Striostrea Prismatica (gray, 1825) en dos poblaciones en la costa de Manabí

Abstract

The rock oyster fishery Striostrea prismatica (Gray, 1825) is an important craft due to its consumption. Growth and mortality of rock oyster in two populations of the coast of Manabí, Ecuador was evaluated: Napo Punta, San Vicente and Gorda Punta, Sucre from February to May 2013. Biometric analysis was performed as total length (mm) total weight (g) to estimate the population structure, growth parameters (L∞, K, t0, Tmax), growth rate (Ø’), the total length-weight relationship overall, total mortality, natural mortality and fishing mortality rate of resource exploitation. In Napo Punta, San Vicente L∞= 168,0 mm was obtained; K= 1,11/year; t0= -0,089 and Tmax= 2,6; Φ'= 4,496, with a total length-weight total Pt= 0,0003Lt2,8701 relationship (r2= 0,7792; n= 362); with a total mortality rate Z= 2,85 ± 0,21/year, natural mortality M= 1,15; fishing mortality was F= 1,70 and exploitation rate E= 0,60; Gorda Punta, Sucre instead to was: L∞= 199,5 mm; K= 1,91/year; t0= -0,048 and Tmax= 1,52; Φ'= 4,88; full-length with a total weight Pt= 0,0004Lt2,8049 (r2= 0,8142; n= 546) relationship; Z= 5,80 ± 0,43/year; M= 1,97; F= 3,83 and E= 0,66. Growth parameters and mortality rates are the first results estimated for the S. prismatica on the coast of Manabí, considered useful background for the assessment and sustainable resource management.