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Gametogenic cycle of Crassostrea gigas in contrasting Mediterranean habitats: marine (Gulf of Tunis) and continental (Bizert lagoon) culture sites.

Dridi S, Romdhane MS, Elcafsi M - J Biol Res (Thessalon) (2014)

Bottom Line: The applied techniques gave similar results.The obtained results are probably related with the different environmental conditions of the studied habitats, temperature and food supply, in particular.The sexual cycle of the species was successfully completed in the marine area, stressing the invasive character of C. gigas.

View Article: PubMed Central - PubMed

Affiliation: Institut Supérieur de Pêche et d'Aquaculture de Bizerte, ISPA -BP 15, ERRIMEL, 7080 Bizerte, Tunisia.

ABSTRACT

Background: The gametogenic cycle of Crassostrea gigas, a species imported into the Mediterranean for aquaculture, has been studied (May 2005 to July 2006) in two contrasting habitats of Tunisia: the Bizert lagoon, where oyster farms have been developed since 1970, and the Gulf of Tunis, where oysters have been experimentally farmed during this study, to assess the potential of this latter marine area for sustaining oyster-culture.

Results: The sexual cycle of the species was described through the histological examination of the gonads, the estimation of oocytes diameter, and the assessment of its condition and gonadal condition indices. The applied techniques gave similar results. The gametogenic cycle of C. gigas was precocious and more intense in oysters farmed within the lagoon than in the marine area, considering as well gonadal growth, maturation stages and gametes release.

Conclusions: The obtained results are probably related with the different environmental conditions of the studied habitats, temperature and food supply, in particular. The sexual cycle of the species was successfully completed in the marine area, stressing the invasive character of C. gigas.

No MeSH data available.


Variation of gonadosomatic index (GCI) inCrassostrea gigasat Port aux Princes (PP) and a Ferme Marine de Bizerte (FMB).
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Fig7: Variation of gonadosomatic index (GCI) inCrassostrea gigasat Port aux Princes (PP) and a Ferme Marine de Bizerte (FMB).

Mentions: CI and GCI showed increased values and diversified temporal pattern in FMB compared to PP sites (Figure 6 & Figure 7). In FMB, maximum CI values were observed in May 2005 and 2006. The index decreased after May 2005 until August, and then, further decreased until October 2005, where it reaches its minima. Thereafter, a gradually increasing trend was observed until April 2006, getting again its maxima in May 2006, and followed by a decrease to its previous values in the next months (Figure 6). In PP the above pattern was modified. In 2005 maximum values were observed in June and minimum ones in July and October; after that month CI followed an increasing trend, reached its maxima in June 2006, and then dropped again in July 2006 (Figure 6).Figure 6


Gametogenic cycle of Crassostrea gigas in contrasting Mediterranean habitats: marine (Gulf of Tunis) and continental (Bizert lagoon) culture sites.

Dridi S, Romdhane MS, Elcafsi M - J Biol Res (Thessalon) (2014)

Variation of gonadosomatic index (GCI) inCrassostrea gigasat Port aux Princes (PP) and a Ferme Marine de Bizerte (FMB).
© Copyright Policy - open-access
Related In: Results  -  Collection

License 1 - License 2
Show All Figures
getmorefigures.php?uid=PMC4390001&req=5

Fig7: Variation of gonadosomatic index (GCI) inCrassostrea gigasat Port aux Princes (PP) and a Ferme Marine de Bizerte (FMB).
Mentions: CI and GCI showed increased values and diversified temporal pattern in FMB compared to PP sites (Figure 6 & Figure 7). In FMB, maximum CI values were observed in May 2005 and 2006. The index decreased after May 2005 until August, and then, further decreased until October 2005, where it reaches its minima. Thereafter, a gradually increasing trend was observed until April 2006, getting again its maxima in May 2006, and followed by a decrease to its previous values in the next months (Figure 6). In PP the above pattern was modified. In 2005 maximum values were observed in June and minimum ones in July and October; after that month CI followed an increasing trend, reached its maxima in June 2006, and then dropped again in July 2006 (Figure 6).Figure 6

Bottom Line: The applied techniques gave similar results.The obtained results are probably related with the different environmental conditions of the studied habitats, temperature and food supply, in particular.The sexual cycle of the species was successfully completed in the marine area, stressing the invasive character of C. gigas.

View Article: PubMed Central - PubMed

Affiliation: Institut Supérieur de Pêche et d'Aquaculture de Bizerte, ISPA -BP 15, ERRIMEL, 7080 Bizerte, Tunisia.

ABSTRACT

Background: The gametogenic cycle of Crassostrea gigas, a species imported into the Mediterranean for aquaculture, has been studied (May 2005 to July 2006) in two contrasting habitats of Tunisia: the Bizert lagoon, where oyster farms have been developed since 1970, and the Gulf of Tunis, where oysters have been experimentally farmed during this study, to assess the potential of this latter marine area for sustaining oyster-culture.

Results: The sexual cycle of the species was described through the histological examination of the gonads, the estimation of oocytes diameter, and the assessment of its condition and gonadal condition indices. The applied techniques gave similar results. The gametogenic cycle of C. gigas was precocious and more intense in oysters farmed within the lagoon than in the marine area, considering as well gonadal growth, maturation stages and gametes release.

Conclusions: The obtained results are probably related with the different environmental conditions of the studied habitats, temperature and food supply, in particular. The sexual cycle of the species was successfully completed in the marine area, stressing the invasive character of C. gigas.

No MeSH data available.