Embriologia do siri Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae)

Abstract

ABSTRACT. Embryology or the swimming crab Arenaeus cribrarius (Lamarck) (Crustacea, Brachyura, Portunidae). Ovigerous females of Arenaeus cribrarius were collected at Ubatuba, São Paulo, and maintaining in aquaria under controlled temperature (25±IOC), salinity (35±I %o) and photoperiod (12: 12). A small sample of eggs was collected for each 24h, for morphological description, chromatic changes and biometric analysis throughout the embryonic development. Eight egg stages were photographed and had their small and large diameters measured under a microscope provided with camera lucida. The egg' s shape was low elliptical during ali the embryogenesis and showed size increase (24.4%) and volume (91.1 %), when the last stage were compared with the first one. According to mean egg diameter and volume, the eggs should be pooled in three different groups (1-3; 4-6; 7-8) corresponding to initial, intermediate ando final stages. The attained results were compared with the literature which emphasizing the species of Portunidae's family .

Condition factor of Goniopsis cruentata (Crustacea, Brachyura, Grapsidae) from Mundaú/Manguaba estuarine complex, Alagoas, Brazil

“…In this study, Pinheiro & taddei (2005) found that the ovaries were three times larger than the testis of a male with similar size. Pinheiro et al (1999) observed that the condition factor of females of A. cribrarius was about 1.2 times larger than that of males, similar to the result observed by Pinheiro & FiSCareLLi (2009) for U. cordatus (1.5 times) and to G. cruentata (1.5 times) in the present study.…”

Crescimento do caranguejo de água doce, Dilocarcinus pagei Stimpson (Crustacea, Brachyura, Trichodactylidae)

“…Este resultado se coaduna com aqueles obtidos para outros braquiúros já estudados (HATTORI & PINHEIRO 2001, PINHEIRO & HATTORI 2002, 2003, sendo confirmado pela correlação negativa entre sua duração com a temperatura da água (PINHEIRO et al 1994) O reduzido número de modas e grupos etários na população estudada reflete a sazonalidade reprodutiva da espécie (PINHEIRO & TADDEI, em preparação), fato que vem sendo relatado para outros caranguejos dulcícolas (PILLAI & SUBRAMONIAM 1984, LIU & LI 2000, OKANO et al 2000. Os dados obtidos também permitem inferir sobre o crescimento extremamente rápi-do desta espécie, já que atinge sua maturidade sexual com um ano e o tamanho máximo com 2,5 anos.…”

Fecundity and Reproductive Output of the Speckled Swimming Crab Arenaeus Cribrarius (Lamarck, 1818) (Brachyura, Portunidae)

“…Fecundity estimates and establishment of the breeding period can contribute to assess the renewal capacity of exploited species, providing a basis for shery control legislation. The periodicity and intensity of reproduction have been estimated based on the frequency of ovigerous females (Paul, 1982;Potter et al, 1983;Mori, 1987) and/or occurrence of females with fully developed gonads during a 1-year period (Santos, 1994;Pinheiro, 1995).…”

“…It is rarely found in estuaries and coastal lagoons (Rathbun, 1930;Melo, 1996). Among the published contributions concerning the species, only a few of them focus on its reproductive biology, such as description of larval stages (Stuck & Truesdale, 1988), reproductive dynamics (Pinheiro, 1995), sexual maturity (Pinheiro & Fransozo, 1998), or reproductive behaviour in captivity (Pinheiro & Fransozo, 1999).…”

“…Such information has called the attention to this species, which is still underexploited , and considered as shery waste by many Brazilian shermen (Pinheiro, 1995).…”