Artigo
Reproductive biology of the shrimp Rimapenaeus constrictus (Decapoda, Penaeidae) in the ubatuba region of Brazil
Fecha
2004-05-01Registro en:
Journal of Crustacean Biology, v. 24, n. 2, p. 274-281, 2004.
0278-0372
10.1651/C-2437
WOS:000222068600006
2-s2.0-2942614821
4475960200256592
0000-0002-2067-5406
Autor
Group of studies on Crustacean Biology, Ecology and Culture (NEBECC)
Universidade Federal do Paraná (UFPR)
Universidade Estadual Paulista (Unesp)
Resumen
Sexual maturity, temporal reproductive pattern, and recruitment of juveniles were examined for the shrimp Rimapenaeus constrictus at three different bays in the Ubatuba region (Mar Virado, Ubatuba, and Ubatumirim), State of São Paulo (23°S 45°W). Monthly samples were taken from January 1998 to December 1999. The presence or absence of mating plugs (associated with mating and insemination) and ovarian maturity were used to examine breeding in adult females. The whole sample comprised 3863 females and 1468 males. Estimates of size (carapace length) at the onset of sexual maturity were 7.0 mm and 7.8 mm for males and females, respectively. Higher percentage of females bearing ripe gonads was observed during spring and summer over the course of the study, contrasting to the low proportion in fall 1998 and winter 1999. Juvenile shrimps were sampled year-round. These results suggest a continuous reproductive pattern for R. constrictus. Mating, spawning, and juvenile recruitment took place mostly in shallow waters up to 20-m depths in the study region. Warm to mild temperatures may favour the spawning pattern observed in this species. The classical paradigm of continuous reproduction at lower latitudes, with increased seasonality of breeding period at higher latitudes, seems to apply to this species.