Resumen

LISTA ALFONZO, María E; VELASQUEZ, Carlos J; PRIETO ARCAS, Antulio S  y  LONGART ROJAS, Yelipza C. Physiological condition of Arca zebra by groups of sizes and its association with environmental variables, in the bank of Chacopata, Sucre state. Zootecnia Trop. [online]. 2014, vol.32, n.1, pp.33-43. ISSN 0798-7269.

The physiological condition of A. zebra by groups of sizes and its association with environmental variables were evaluated analysing the condition index (CI), for which there were field trips to the morro de Chacopata, from June 2008 to June 2009. The samples were collected with a drag of 120 x 86 cm, to an approximate depth of 8 m. It is randomly selected samples of different lengths (Lt) distributed in four groups of sizes: group I (< 30.0 mm), group II (30.1 to 50.0 mm), group III (50.1 to 70.0 mm) and the group IV (> 70.0 mm). Each samples, monthly was determined the dry biomass of the gonad (Psg) and the total weight of the body (Psorg) and, from these won the IC. Also there were monthly environmental variables: temperature, salinity, dissolved oxygen, seston total, organic and inorganic and chlorophyll a. The results indicated that the CI in the organisms of the group I, were positively correlated with the chlorophyll a and salinity; while, that samples of the groups II, III and IV the IC showed positive association with temperature; indicating the influence of environmental variables on the physiology of A. zebra. The species showed a good physiological condition in samples > of 50.0 mm, being from this size recommended for their commercial exploitation and in the periods: June, September and November of each year.

Palabras clave : physiological condition; shell; Arca zebra; Chacopata; Araya peninsula; environmental variables.

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