POPULATIONAL DYNAMICS OF Geophagus brasiliensis (Quoy & Gaimard, 1824) AT THE ÁGUAS BELAS RESERVOIR, VIAMÃO, RIO GRANDE DO SUL, BRAZIL (TELEOSTEI, CICHLIDAE)
Abstract
Populational dynamics of Geophagus brasiliensis (Quoy & Gaimard, 1824) was studied from September/ 1995 to August/1996, through bi monthly samples at the Águas Belas reservoir, Viamão, Rio Grande do Sul, Brazil (30°02'22"S and 51°01'11.5'W). Individuais were captured using a beach reine 10 m long, 2 m high and a circular fishing net, both with 5 mm of mesh size. The reproductive period begins in October, with maximum reproduction activity in November and February, ending on march. The absolute fecundity was estimated 566 ± 142 oocytes, in females ranging from 7.28 to 13.17 cm. The size at the first maturation was between 8 and 9 cm.
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