Abstract

GONZALEZ, Carmen et al. Size structure , growth and mortality of Crassostrea rhizophorae at la Restinga lagoon , Margarita island , Venezuela. Saber [online]. 2015, vol.27, n.2, pp.328-333. ISSN 1315-0162.

The size structure, height - weight relationship and growth rate and mortality of the mangrove oyster Crassostrea rhizophorae were evaluated in the area La Tortuga, La Restinga Lagoon, during the period march 2012 - february 2013. Monthly ramdom samples of oysters were taken. The annual size composition consisted of individuals between 15 and 95 mm in length, with a larger number of individuals in the range 45 to 60 mm. The length-weight relationship showed a positive relationship, with a correlation coefficient r = 0.66 and a slope b = 1.80, indicating that the species has a negative allometric growth. The model of growth in length was represented by the equation Lt = 103.41 [1 - exp (-1.59 (t-0, 31))], showing a fast growth which allows the oyster to reach commercial size (60 mm ) at 6 months, with a maximum estimated longevity of 2 years.

Keywords : Mollusks; bivalves; oysters; management; Caribbean sea.

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