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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.


Monthly variations of temperature (T) and chlorophyllaregistered in Port aux Princes (PP) and in Ferme Marine de Bizerte (FMB) in Tunisia.
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Fig1: Monthly variations of temperature (T) and chlorophyllaregistered in Port aux Princes (PP) and in Ferme Marine de Bizerte (FMB) in Tunisia.

Mentions: Temperature values followed similar temporal trends at both stations, varying from 12.2 to 28.7°C (average at 19.8 ± 5.3°C) at PP (see Methods), and from 10 to 30°C (20.7 ± 6.3°C) at FMB (see Methods) (Figure 1). The average concentration of chlorophyll a was lower at PP (0.5 ± 0.4 g l−1) than FMB (0.8 ± 0.6 g l−1); however similar temporal trends were observed (Figure 1) with minimum values recorded in December (0.15 g l−1 at both stations) and maximum ones in April (1.75 g l−1and 2.4 g l−1, for PP and FMB, respectively).Figure 1


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)

Monthly variations of temperature (T) and chlorophyllaregistered in Port aux Princes (PP) and in Ferme Marine de Bizerte (FMB) in Tunisia.
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig1: Monthly variations of temperature (T) and chlorophyllaregistered in Port aux Princes (PP) and in Ferme Marine de Bizerte (FMB) in Tunisia.
Mentions: Temperature values followed similar temporal trends at both stations, varying from 12.2 to 28.7°C (average at 19.8 ± 5.3°C) at PP (see Methods), and from 10 to 30°C (20.7 ± 6.3°C) at FMB (see Methods) (Figure 1). The average concentration of chlorophyll a was lower at PP (0.5 ± 0.4 g l−1) than FMB (0.8 ± 0.6 g l−1); however similar temporal trends were observed (Figure 1) with minimum values recorded in December (0.15 g l−1 at both stations) and maximum ones in April (1.75 g l−1and 2.4 g l−1, for PP and FMB, respectively).Figure 1

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.