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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.


Average values of oocyte diameters inCrassostrea gigasat Port aux Princes (PP) and Ferme Marine de Bizerte (FMB).
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Fig4: Average values of oocyte diameters inCrassostrea gigasat Port aux Princes (PP) and Ferme Marine de Bizerte (FMB).

Mentions: Mean oocyte diameter (MOD) showed significant temporal variability at both PP and FMB (Figure 4). In PP a gradual increase was recorded from May 2005 to June 2005; thereafter, maximum MOD values were detected until October 2005, where MOD presented a sudden drop as only individuals at the stage 0 were observed from November until January 2006. MOD started again to increase from March 2006 to reach again its maxima in July 2006. A rather similar pattern was detected in FMB; MOD showed increased values until September 2005, and dropped a month earlier in October 2005. In contrast to PP, MOD showed very low, but no-zero values, until January 2006, and then, started to increase to reach its maxima during the period May-July 2006.Figure 4


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)

Average values of oocyte diameters inCrassostrea gigasat Port aux Princes (PP) and 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

Fig4: Average values of oocyte diameters inCrassostrea gigasat Port aux Princes (PP) and Ferme Marine de Bizerte (FMB).
Mentions: Mean oocyte diameter (MOD) showed significant temporal variability at both PP and FMB (Figure 4). In PP a gradual increase was recorded from May 2005 to June 2005; thereafter, maximum MOD values were detected until October 2005, where MOD presented a sudden drop as only individuals at the stage 0 were observed from November until January 2006. MOD started again to increase from March 2006 to reach again its maxima in July 2006. A rather similar pattern was detected in FMB; MOD showed increased values until September 2005, and dropped a month earlier in October 2005. In contrast to PP, MOD showed very low, but no-zero values, until January 2006, and then, started to increase to reach its maxima during the period May-July 2006.Figure 4

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.