Abstract

PRIETO ARCAS, Antulio et al. Producción secundaria e índice de condición en  Arca zebra (Mollusca:  Bivalvia) del Golfo de Cariaco, Venezuela. Rev. biol. trop [online]. 2001, vol.49, n.2, pp.599-608. ISSN 0034-7744.

Production and condition index of a turkeywing (Arca zebra) population were studied from August 1984 to August 1985 in Pariche, Cariaco Gulf, Venezuela. Production was studied through bimonthly collections using a method designed for populations with continuous reproduction and indistinguishable age classes. The population distribution was stable with a mean density of 37 ind.m^-2. A production of 131.61 g dry weight m^-2.year^-1 was calcuclated from data on density, biomass and weight increase along the year. Highest production was between February 1985 and August 1985 (65%) and concentrated in individuals 60.00-79.95 mm long (45.73%). There  was large seasonal variation in the mean monthly condition index (IC= (Ps/Ph) x100) in the two size classes examined: it reached a maximum in July 1985 (26.84%) and a minimum in January 1985 (16.31%).

Keywords : Arca zebra; fishery resource; turkeywing; Bivalvia; production; biomass.