MORTALITY, SURVIVAL AND LONGEVITY OF Geophagus brasiliensis (Quoy & Gaimard, 1824) AT ÁGUAS BELAS RESERVOIR (VIAMÃO, RS, BRAZIL) (TELEOSTEI, CICHLIDAE)
Keywords:
Geophagus, cichlidae, cará, population dynamics.Abstract
The study of mortality of Geophagus brasiliensis (Quoy & Gaimard, 1824) was made at the Águas Belas reservoir (Viamão, RS, Brasil). The samples were taken fortnightly from September / 1995 to August/1996. The animais were captured using a beach seine and a circular fishing net, both with 5 mm mesh size. The total mortality (Z) and the natural mortality (M) rates were the same, since there is no fishing over the population in the reservoir. The Z rate was 54% and the survival one was 46%. Longevity was 10, 34 (females) and 9,37 (males) years. The female length curve parameters were: Linf. = 18.54; K = 0.29 and to = 1.15.
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