Estructura de tallas, crecimiento y mortalidad de crassostrea rhizophorae en la laguna de la restinga, Isla de Margarita, Venezuela / Size structure, growth and mortality of crassostrea rhizophorae at la restinga lagoon, Margarita Island, Venezuela

2015 
Resumen Se evaluo la estructura de talla, la relacion talla peso y la tasa de crecimiento y mortalidad de la ostra de mangle Crassostrea rhizophorae en la zona de La Tortuga, laguna de La Restinga, durante el periodo marzo 2012 - febrero 2013. Para ello se realizaron muestreos mensuales y aleatorios de las ostras. La composicion anual de talla estuvo integrada por organismos de 15 a 95 mm de longitud total, con un mayor numero de individuos en el intervalo de 45 y 60 mm. La relacion talla-peso presento un coeficiente de correlacion r = 0,66 y una pendiente b = 1,80, senalando que la especie tiene un crecimiento alometrico minorante. El modelo de crecimiento en longitud estuvo representado por la ecuacion Lt = 103,41 [1 - exp (-1,59 (t-0,31))], mostrando un crecimiento acelerado alcanzando a los 6 meses la talla comercial (60 mm), con una longevidad maxima estimada de 2 anos. Palabras clave: Moluscos, bivalvos, ostras, manejo, Mar Caribe. ABSTRACT 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. Key words: Mollusks, bivalves, oysters, management, Caribbean sea.
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