Estádios de desenvolvimento dos órgãos reprodutivos dos machos de Panulirus echinatus Smith (Decapoda: Palinuridae)

Abstract

Esta pesquisa caracteriza os estádios de desenvolvimento dos testículos e canais deferentes da lagosta Panulirus echinatus Smith, 1869 a partir da relação entre seus aspectos macroscópicos, microscópicos e a relação gonadossomática (RGS). Através de amostragem mensal (novembro de 1999 a outubro de 2000) foram capturados 1716 machos, empregando-se redes de espera de fundo. Retirou-se a região dorsal da carapaça para avaliação dos órgãos reprodutivos. Os testículos e canais deferentes foram dissecados, pesados, fixados em solução de Bouin e submetidos aos procedimentos histológicos. A análise microscópica dos órgãos reprodutivos foi avaliada pela presença ou ausência de espermatozóides nos testículos e canais deferentes. Esta, quando associada a macroscopia (mudança de cor, tamanho, diâmetro e desenvolvimento de espermatóforo) e a relação gonadossomática (RGS), possibilitou a caracterização de três estádios de desenvolvimento: imaturo, intermediário e maturo. Ficou evidenciada que a maturidade dos testículos precedeu a maturidade dos canais deferentes. Para avaliar se a RGS é um bom indicador quantitativo dos estádios de maturidade, um teste t (alfa = 0,05) foi usado e constatou diferença significativa nas médias da RGS. A RGS pode ser utilizada como indicadora dos estádios de maturidade para P. echinatus.

Seasonal variations in the biochemical composition and reproductive cycle of the ghost crab Ocypode quadrata (Fabricius, 1787) in Southern Brazil

“…Full gonads were found throughout the year and empty gonads from December to April (Dalabona and Silva, 2005). In the lobster Panulirus echinatus, three developmental stages were described: immature, intermediate, and mature (Barreto and Katsuragawa, 2008). The cytological characteristics of the testis of O. quadrata are in agreement with descriptions for other crustaceans, such as E. analoga (Vaughn and Thomson,'72) and the crayfishes Parastacus brasiliensis and P. defossus (Almeida and Buckup, '97, 2000).…”

“…Analysis of the biochemical composition and its seasonal variations is important for reproductive biology, because it is fundamental to understand how different organs can act to store and transfer organic reserves to support gonadal maturation, reproductive period, and the maintenance of the animal (Pillay and Nair, '73;Rosa and Nunes, 2003a). The GSI is used to evaluate the development of the gonads during crustacean reproduction (Rosa and Nunes, 2003b;Castiglioni et al, 2006;Barreto and Katsuragawa, 2008). Histological analysis is a valuable method to investigate gonadal maturation (López et al, '97;Peixoto et al, 2002;Dalabona and Silva, 2005;Barreto and Katsuragawa, 2008).…”

“…The GSI is used to evaluate the development of the gonads during crustacean reproduction (Rosa and Nunes, 2003b;Castiglioni et al, 2006;Barreto and Katsuragawa, 2008). Histological analysis is a valuable method to investigate gonadal maturation (López et al, '97;Peixoto et al, 2002;Dalabona and Silva, 2005;Barreto and Katsuragawa, 2008).…”

Composition and spatial distribution of subtidal decapoda on the "Reef Coast", northeastern Brazil, evaluated through a low-impact visual census technique

“…However, we expected that decapods found in the shallower and more easily accessed areas on a reef bench that is heavily used by tourists (MMA, SECTMA and CPRH, 2003) would be less abundant and less diverse, especially species with economic value. Surprisingly, these shallower areas showed the highest diversity and abundance, suggesting that the Confined-water areas provide shelter for juveniles and young decapods, as also recorded for the spiny lobsters Panulirus argus and Panulirus echinatus, which use the crevices of coastal reefs as refuges (Barreto and Katsuragawa, 2008;Igarashi, 2010).…”

“…They range from inconspicuous to large forms, including shrimps, lobsters and crabs, and are distinguished by their high diversity and their importance in fisheries and trophic dynamics in these environments (Randall, 1967;Dubinsky and Stambler, 2011). The number of studies of diversity and distribution patterns of decapods on coral reefs is still relatively low, probably because these crustaceans have cryptic habits and live hidden during the day in burrows, crevices and caves (Barreto and Katsuragawa, 2008;Igarashi, 2010;Dubinsky and Stambler, 2011), limiting collection and observation.…”