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Trophic relationships gonad-intestinal loop in Pecten maximus . ArchiMer
Lepennec, M; Dorange, G; Beninger, P; Donval, A; Widowati, I.
Histological, histochemical and ultrastructural studies were performed on the region of the gonad traversed by the intestine in Pecten maximus . The results indicate a digestive and absorptive function of intestine epithelial cells and a transfer of metabolites to the surrounding gonad tissue. Several possible mechanisms of translocation are presented, including diffusion into the haemolymph and transfer via vacuolated cells of the gonad interstitial connective tissue.
Tipo: Text Palavras-chave: Pecten maximus; Bivalvia; Histology; Haemolymph; Histochemistry; Cells; Metabolites; Epithelia; Intestines; Ultrastructure; Animal reproductive organs.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1668.pdf
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Caracteristiques ultrastructurales du spermatozoide de la coquille Saint-Jacques, Pecten maximus (Mollusque, Bivalve) ArchiMer
Dorange, G; Lepennec, M.
The spermatozoon of Pecten maximus is of the primitive type usually associated with species having external fertilization or emitting the sperm in the water. The size of the nucleus is reduced. The middle piece is similar to that reported for several Bivalves. It contains glycogen. But the spermatozoon of P. maximus exhibits its own ultrastructural characteristics: the short acrosome differs in size, shape, position and ultrastructure or by a combination of these from that of many bivalves. No axial rods was observed in contrast to several species of Mytilidae, Veneridae and Ostreidae. These originalities could go to the genus level.
Tipo: Text Palavras-chave: Pecten maximus; Bivalvia; Ultrastructure; Sperm.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1725.pdf
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Etude experimentale de la maturation ovocytaire chez Pecten maximus et Crassostrea gigas (Mollusca, Bivalvia) ArchiMer
Widowati, L; Cochard, Jean-claude; Dorange, G; Le Pennec, M.
To date, it has been impossible to fertilize the oocytes of ripe Pecten maximus obtained by gonad stripping as it is routinely done in hatchery with Crassostrea gigas . The events occurring between artificial induction of spawning and normal fertilization were studied experimentally in order to explain this difference. Fertilization and rearing trials were performed on oocytes obtained from the gonads of both species by scarification, by aspiration from genital ducts (of P. maximus only) and after spawning. Every batch of oocytes was fixed for histological study. Serial sections of the gonad of a fixed spawning P. maximus were made to reveal modifications of the nucleus of the oocytes during their expulsion. In P. maximus the stripped oocytes can be...
Tipo: Text Palavras-chave: Crassostrea gigas; Pecten maximus; Bivalvia; Marine molluscs; Animal reproductive organs; Larvae; Fecundity; Experimental research; Spawning; Sexual maturity.
Ano: 1991 URL: http://archimer.ifremer.fr/doc/1991/acte-1632.pdf
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