Resumo
The reproductive aspects of the freshwater shrimp Palaemon pandaliformis (Stimpson, 1871) were studied from March, 1998 to February, 1999. Monthly, samples were collected with sives, 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 of telson with precision callipters. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was measured with calibrated stereomicroscope. A total of 872 were collected among which, 46% female, 29% male and 25% juvenil. The sex ratio was 1:1.57. Ovigerous females were present during all seasons, but the reproductive peak accurred in Spring. The ovigerous female showed total lenght from 23.0 to 39.6 mm. The mean fecundity was 137 eggs per female, with a minimum of 40 eggs and a maximum of 270 eggs. The first sexual maturation probably occur at 23.0 mm total lenght. The mean diameter os the eggs size was 0.51 mm (minor) and 0.73 mm (major).
Reproduction; Palaemon pandaliformis; freshwater shrimp; Sahy River; Rio de Janeiro State
Reproduction; Palaemon pandaliformis; freshwater shrimp; Sahy River; Rio de Janeiro State
Aspectos reprodutivos de Palaemon pandaliformis (Stimpson) (Crustacea, Decapoda, Palaemonidae) no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil
The reproductive aspects of the freshwater shrimp Palaemon pandaliformis (Stimpson) (Crustacea, Decapoda, Palaemonidae) 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, 23860-020 Mangaratiba, Rio de Janeiro. E-mail: oshiro@ufrrj.br
ABSTRACT
The reproductive aspects of the freshwater shrimp Palaemon pandaliformis (Stimpson, 1871) were studied from March, 1998 to February, 1999. Monthly, samples were collected with sives, 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 of telson with precision callipters. The ovigerous shrimps were separated and counted for fecundity determination. The eggs diameter was measured with calibrated stereomicroscope. A total of 872 were collected among which, 46% female, 29% male and 25% juvenil. The sex ratio was 1:1.57. Ovigerous females were present during all seasons, but the reproductive peak accurred in Spring. The ovigerous female showed total lenght from 23.0 to 39.6 mm. The mean fecundity was 137 eggs per female, with a minimum of 40 eggs and a maximum of 270 eggs. The first sexual maturation probably occur at 23.0 mm total lenght. The mean diameter os the eggs size was 0.51 mm (minor) and 0.73 mm (major).
Key words: Reproduction, Palaemon pandaliformis, freshwater shrimp, Sahy River, Rio de Janeiro State
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AGRADECIMENTOS. Ao Sr. Casemiro Antônio Alves e ao Sr. Benedito Albernaz Lima pelo auxílio nas coletas mensais realizadas.
Recebido em 14.IX.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
-
Aceito
03 Set 2002 -
Recebido
14 Set 2001
