Resumo
The reproductive aspects of the freshwater shrimp Potimirim glabra (Kingsley, 1878) were studied from September 1997 to February 1999. Monthly, samples were collected with sieves, on the river edge, under the edging vegetation or in small pools. At the laboratory, shrimps were sexed and measured in their total lenght, from the tip of the rostrum to the end of telson with precision callipers. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was measured with calibrated stereomicroscope. A total of 3281 shrimps were collected, among which, 47% male, 46% female (13.4% ovigerous females) and 7% young shrimps. The Sex ratio was 1:1. Ovigerous females were present during all seasons, but the reproductive peak occurred 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 female, with a minimun of 223 eggs and a maximum of 860 eggs. The first sexual maturation probably occur at 9.5 mm total lenght. The mean diameter of the eggs size was 0.32 mm (minor) and 0.53 mm (major).
Crustacea; Decapoda; Atyidae; Freshwater shrimp; Potimirim glabra; Reproduction; Sahy River; Rio de Janeiro State
Crustacea; Decapoda; Atyidae; Freshwater shrimp; Potimirim glabra; Reproduction; Sahy River; Rio de Janeiro State
Aspectos reprodutivos de Potimirim glabra (Kingsley) (Crustacea, Decapoda, Atyidae) no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil
The reproductive aspects of the freshwater shrimp Potimirim glabra (Kingsley) (Crustacea, Decapoda, Atyidae) from Sahy River, Mangaratiba, Rio de Janeiro, Brazil
Giovana Valverde Lima; Lídia Miyako Yoshii Oshiro
Estação de Biologia Marinha, Universidade Federal Rural do Rio de Janeiro. Rua Sereder, Itacuruçá, 23860-000 Mangaratiba, Rio de Janeiro, Brasil. E-mail: oshiro@ufrrj.br
ABSTRACT
The reproductive aspects of the freshwater shrimp Potimirim glabra (Kingsley, 1878) were studied from September 1997 to February 1999. Monthly, samples were collected with sieves, on the river edge, under the edging vegetation or in small pools. At the laboratory, shrimps were sexed and measured in their total lenght, from the tip of the rostrum to the end of telson with precision callipers. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was measured with calibrated stereomicroscope. A total of 3281 shrimps were collected, among which, 47% male, 46% female (13.4% ovigerous females) and 7% young shrimps. The Sex ratio was 1:1. Ovigerous females were present during all seasons, but the reproductive peak occurred 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 female, with a minimun of 223 eggs and a maximum of 860 eggs. The first sexual maturation probably occur at 9.5 mm total lenght. The mean diameter of the eggs size was 0.32 mm (minor) and 0.53 mm (major).
Key words: Crustacea, Decapoda, Atyidae, Freshwater shrimp, Potimirim glabra, Reproduction, Sahy River, Rio de Janeiro State
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AGRADECIMENTOS. Ao Dr. Marcelo Antônio Amaro Pinheiro (UNESP - Jaboticabal) e Dr. Lenício Gonçalves (UFFRJ) pela apreciação da dissertação apresentada ao Curso de Ciências Ambientais e Florestais/UFRRJ. À Zootecnista Charlene Moreira da Silveira, ao Sr. Casemiro Antônio Alves e ao Sr. Benedito Albernaz Lima pelo auxílio na realização das coletas mensais.
Recebido em 09.XI.2001; aceito em 03.IX.2002.
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Datas de Publicação
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Publicação nesta coleção
15 Maio 2009 -
Data do Fascículo
Set 2002
Histórico
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Aceito
03 Set 2002 -
Recebido
09 Nov 2001
