Aspectos reprodutivos de Palaemon pandaliformis (Stimpson) (Crustacea, Decapoda, Palaemonidae) no Rio Sahy, Mangaratiba, Rio de Janeiro, Brasil

Abstract

ABSTRACT. T he reprodu clive aspects of lhe freshwaler sh rimp Palaem oTl palldaliJormis (S limpson) (Cruslacea, Decapoda, Palaemonidae) from Sahy Rive r, Mangaratiba, Rio de Janeiro, Brazil. The reprodllctive aspects of the fres hwater shri mp Palaellloll pandaliformis (Stimpson, 187 1) were tudied fro m March, 1998 to February, 1999. Monthly, samples were collected wilh sives, on lhe ri ver edge, under lhe edging vegetation or in small pools. At lhe laboratory, shri mps were sexed and measured in their totallenght, From the tip ofthe rostrllm to lhe oFtelson with precision callipters. The ovigerous shrim ps were separated and counted fo r fec llndity determination. The eggs diameter was measured wi th calibrated tereomicroscope. A total of 872 were collected among which, 46% female, 29% male and 25 % juvenil. The sex ratio was I : 1.57. Ovigerolls fe males were present dllring ali seasons, bllt the reprodllctive peak accllrred in Sp ring. The ov igero lls female showed total lenght from 23.0 to 39.6 mm . The mean fecund ity was 137 eggs per female, with a minimum of 40 eggs and a max imum of 270 eggs. The fir t sexual mat uration probably OCCllr at 23 .0 mm total lenght. The mean diameter os the eggs size was 0. ( 1996, 1999), es tud a ra m os as pectos reprod u tivos da es pécie, res pe ctiva m e nte nos Es tad os d e P e rn a mb uco e S a nta Catarina.Este trabalho proc u ro u a m p liar as info rm ações sobre a esp éc ie e contribui r pa ra o conhecimento de s ua bi o logia re pro dutiv a no Ri o S a hy , M a n ga ra tib a, Es ta d o do Rio de Janeiro.

Growth and reproductive biology of the amphidromous shrimp Palaemon pandaliformis (Decapoda: Caridea) in a Neotropical river from northeastern Brazil

“…In this study, P. pandaliformis also showed this pattern (see Figs. 5-6 and 9), as observed by Lima & Oshiro (2002) in river Sahy (Rio de Janeiro, Brazil) and Mortari et al (2009) in river Ubatumirim (São Paulo, Brazil).…”

Population structure, fecundity and ecological aspects of freshwater shrimp species (Decapoda, Palaemonidae) of an urban forest fragment in central Amazonia, Brazil

“…For species of the genus Macrobrachium the number of males was larger than the number of females, contradicting the majority of the studies with prawns of Macrobrachium and other palaemonid species, which found a great number of females or equality in the sex ratio (Odinetz-CoUart, 1988;Odinetz-Collart & Enriconi, 1993;Odinetz-Collart & Magalhaes, 1994;García-Dávilla et al, 2000;Lima & Oshiro, 2002;Sampaio et al, 2007). A greater number of males in the samples can be explained by effect of the collection method (baited traps), considering that Macrobrachium individuals are usually territorialists (Garcia-" Dávila et al, 2000).…”

“…Bond & Buckup, 1982;Bond-Buckup & Buckup, 1989;Valenti et al, 1989;Müller et al, 1999;Lima & Oshiro, 2000, 2002Antunes & Oshiro, 2004;Azevedo et al, 2004;Mattos & Oshiro, 2009). However, a few sets of ecological studies determining the effects of environmental characteristics on the distribution of the species in this group are available (e.g., Odinetz-CoUart, 1991;Odinetz-Collart & Rabelo, 1996;Sampaio et al, 2007).…”

Seletividade de armadilhas e atrativos na captura de pequenos peixes e crustáceos em ambientes estuarinos

“…Essa espécie caracteriza-se por ser de pequeno porte, detritívora, comumente encontrada junto à vegetação marginal de ambientes de águas doces e salobras, onde são capturadas com auxílio de peneiras e puçás (Müller et al, 1996;Lima & Oshiro, 2002). Recentemente, Rocha (2010) testou a eficiência de peneiras e armadilhas na amostragem de decápodes, verificando uma maior captura de P. pandaliformis com o uso das últimas, as quais foram iscadas com coração de frango.…”