Aspectos reprodutivos de Potimirim glabra (Kingsley) (Crustacea, Decapoda, Atyidae) no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil

Abstract

ABSTRACT. Thc reproductive aspccts of lhe frcs hwaler shrimp Polimirim glabra (Kingslcy) (C rustacca, Decapoda, Atyidae) from Sahy River, Mangaratiba, Rio de Janeiro, Brazil. The reproduclive aspecls of lhe freshwater shrimp Potimirim glabra (Ki ngs ley, 1878) were sludied from Seplember 1997 10 February 1999. Monthly, sampl es were collecled with sieves, on lhe ri ver edge, under lhe edging vegetati on or in small poo ls. At lhe laboratory, shrimps were sexed and measured in their tOlal lenghl, from lhe li p of lhe rostrum to lhe end of telson with preci sion ca llipers. The ovigerous shrimps were separated and counted for fecundily determination. The eggs diameler was meas ured with ca libraled stereomi croscope. A total of 328 1 shrimps werecoll ected, among which. 47 % male, 46% female ( 13.4% ovigerous fema les) and 7% yo ung shrimps. The Sex rat io was I: I. Ovigerous females were present during ali seasons, bUllhe reproducti ve peak occ urred in spring. The ovigerous female showed total lenght from 9.5 to 26.0 mm and carapace lenght from 1.6 to 7.3 mm. The mean fecundity was 545 eggs per fema le, wi th a minimun of223 eggs and a maximum of 860 eggs. The first sexual maturati on probably oce ur at 9.5 mm total lenght. The mean diameterof lhe eggs size was 0.32 mm (minor) and 0.53 mm (major).

<htm> Camarões de águas continentais (Crustacea, Caridea) da Bacia do Atlântico oriental paranaense, com chave de identificação tabular </htm>

“…Apesar disto, por muito tempo, o conhecimento sobre estes animais foi fragmentário nos principais corpos de águas continentais do país (ROCHA & BUENO, 2004). O desenvolvimento de projetos sobre ecologia e dinâmica populacional cresceu significativamente somente nos últimos 20 anos, especialmente na Região Sudeste e Sul (MÜLLER et al, 1988;BOND-BUCKUP & BUCKUP, 1982;BOND-BUCKUP & BUCKUP, 1983;BOND-BUCKUP & BUCKUP, 1989;VALENTI et al, 1989a;VALENTI et al, 1989b;MÜLLER & CARPES, 1991;LIMA & OSHIRO, 2002;LIMA et al, 2006;NAGATA, 2008). A taxonomia de camarões de água doce apresenta algumas dificuldades relacionadas principalmente à ocorrência de dimorfismo sexual e a semelhança morfológica entre alguns complexos de espécies (SAWAYA, 1946), entretanto, esta tem sido aprimorada com a adição de análises moleculares e revisões da morfologia (MURPHY & AUSTIN, 2003;LIU et al, 2007;CHEN et al, 2009).…”