| [estimation of fertility and quality of oocytes emitted by the clam ruditapes decussatus (linnaeus 1758) during experimental inductions]. | experimental inductions were carried out on some genitors of clams ruditapes decussatus to obtain sexual emissions and estimate the fecondity of this species. the genitors were collected from two sites of tunisian littoral. higher percent of oocytes was found in summer with a maximum of 52 x 10(4) oocytes in gargour (golf of gabès) against 45 x 10(4) in menzel-jemil (lagoon of bizerte). the observation under the electronic microscope of free oocytes allowed us to subdivised them in three groupes ... | 1996 | 9640501 |
| preliminary study of the clam ruditapes decussatus exposed in situ to metal contamination and originating from the gulf of gabès, tunisia. | | 2003 | 14705657 |
| variation of metallothioneins in gills of the clam ruditapes decussatus from the gulf of gabès (tunisia). | cadmium (cd) and metallothionein (mt) concentrations were determined in the subcellular fractions of the gills of the clam ruditapes decussatus. clams were collected monthly during the period of sexual development (from june to august 2001) from two different sites situated in the gulf of gabès (tunisia). these sites differ by their degree of metal contamination. differences in condition index (ci) were observed in june and august between clams from both sites. in clams from both sites, cadmium ... | 2004 | 15683825 |
| does cadmium pollution affect reproduction in the clam ruditapes decussatus? a one-year case study. | the effect of cadmium (cd) on the reproduction of ruditapes decussatus was monitored over a period of 12 months, from june 2001 to june 2002. two sites "bordj d'ungha" and "el hofra" differing by their degree of cadmium contamination were chosen in the gulf of gabès area (tunisia). annual mean concentrations of cd in the whole soft tissues of clams from the site el hofra were more than 4 times higher than those from the site bordj d'ungha (reference site). the gametogenic cycle of the clam r. de ... | 2006 | 16580885 |
| variation of steroid concentrations during the reproductive cycle of the clam ruditapes decussatus: a one year study in the gulf of gabès area. | progesterone, testosterone and estradiol-17beta were measured by radio-immunoassay (ria) in the gonads of the clam ruditapes decussatus. the reproductive cycle was also investigated. our study covered a period of one year, from september 2003 to august 2004. the chosen site "kerkennah", located out of industrial effluents, belongs to the gulf of gabès area (tunisia). steroids varied from 178 to 2459 pg g(-1) wet mass for progesterone, from 40 to 326 pg g(-1) wet mass for testosterone and from 10 ... | 2007 | 17336113 |
| in situ endocrine disrupting effects of cadmium on the reproduction of ruditapes decussatus. | the gulf of gabès is well known for its multiple contaminations which are closely associated with the past and present industrial and anthropogenic activity. in order to evaluate in situ the cadmium bioaccumulation in the clam ruditapes decussatus sampled in this area, we measured cadmium concentrations in the whole soft tissues and in the digestive gland during one year. energy reserves (proteins, glycogen, lipids) were monitored during gametogenesis in the remainder (mantle, adductor muscle, f ... | 2007 | 17611166 |
| in situ potential use of metallothionein as a biomarker of cadmium contamination in ruditapes decussatus. | cadmium (cd) and metallothionein (mt) concentrations were analysed in the gills and digestive gland of clams ruditapes decussatus collected from two sites of the gulf of gabès (tunisia) which differ by their degree of pollution. the effect of biotic (maturity stages, protein, sex and body mass) and abiotic factors (temperature, salinity, site and season) on cd and mt concentrations showed that in the reference site "bordj d'ungha" physiological changes caused by gamete development and maturity c ... | 2009 | 19272647 |