In this paper, the fecundity in Macrobrachium acanthurus (Wiegmann, 1836) of the Ribeira de Iguape river (Southern Brazil) (Crustacea, Decapoda, Palaemonidae), is presented. The mean individual fecundity of the population was estimated. Fecundity was related to either length and/or weight. Our data showed that this species presents high fecundity and is thus suitable for comercial culture. The fecundity/length and fecundity/weight relationships obtained are: F = - 14 712 + 2 311,8 L and F = -1493,9 + 798,76

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In this paper, the relative growth of Macrobrachium acanthurus (Wiegmann, 1836) (Crustacea, Decapoda, Palaemonidae), is presented; the cephalothorax length/abdominal length, telson length/abdominal length and abdominal length/total length relashionships were determined. The adjusted equations showed a isometric growth pattern. There are no changes in these relationships during the animals growth that may be significant in the maximization of the meat's profit

ABSTRACT. ln this paper. femalo Macmhrachilllll corei""". (Linnaeus. 1758) maturation curve. wcight / knglh rdationship. kllgth ano wl.!ight growth curvl!s wcrc stuoieo . Prawns wer.: eaplUreo. hy traps . in Riheira de I~uape river (24°S and 4rW). southan Brazil. There were used 207 females. It was observed that M. cllrcinlls presents several spawnings during its !ife ,ycle and reprodu,tive paiod goes on. ai leasttill six years old. Weighlllength rdalionship can be represented for the equalion W=8.73 E-3 L3.c~. Exprcssions ohtained for length and weight growth curves are L. =21.0 (l_c -o.~9J') aml W, = 190 (l_e· O . 493 ')3.c8. respectively. Asymptotic maximul11 length aml asymptotic maxilllum wcight are nearly allained at six and eight y.:ars 010, rcspectivdy.

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