BECAS
CUMPLIDO ESMORIS Mariano JosÉ
artículos
Título:
Reproductive seasonality and oviposition induction in Trophon geversianus (Gastropoda: Muricidae) from golfo Nuevo, Argentina
Autor/es:
MARIANO CUMPLIDO; ANDRÉS AVERBUJ; GREGORIO BIGATTI
Revista:
JOURNAL OF SHELLFISH RESEARCH
Editorial:
NATL SHELLFISHERIES ASSOC
Referencias:
Año: 2010 vol. 29 p. 423 - 428
ISSN:
0730-8000
Resumen:
The reproductive biology of a population of the edible muricid Trophon geversianus inhabiting an intertidal rockyshore in Golfo Nuevo (Chubut, Argentina) was studied regarding the seasonality of oviposition and oviposition induction underlaboratory conditions. Sex ratio in the population differed from 1:1 (female biased). The mean shell length was 22 mm for malesand 24 mm for females, although the females presented significantly larger maximum sizes. No external sexual dimorphism wasevident, whereas the female snails differed internally by the presence of the albumin and capsule gland and by gonad color.Although the population under study inhabits an area with marine traffic and a concentration of 1.9 ng Sn/g, it did not presentsigns of imposex, in contrast with other sympatric species. T. geversianus presented a marked reproductive seasonality during thestudy period. Oviposition started in May and concluded in November, when hatching of crawling embryos was registered up toJanuary. This seasonality coincided with changes in water surface temperature, ambient temperature, and photoperiod.Reproductive activities were registered when the environmental stress was minimum. In the aquarium, each female laid anaverage of 12 egg capsules (range, 6?26) per oviposition event, and needed a total of 25 h (range,12?57 h) to complete attachmentof a single egg capsule. Data presented here could be useful for culture of the species.