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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.


Related in: MedlinePlus

Oocyte diameter distributions for femaleCrassostrea gigasin (A) Port aux Prince and in (B) Ferme Marine de Bizerte, representing four sexual maturity stages : Early Gametogenesis (EG), Vitellogenesis (V), Maturing (M) and Degeneration (D).
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Fig5: Oocyte diameter distributions for femaleCrassostrea gigasin (A) Port aux Prince and in (B) Ferme Marine de Bizerte, representing four sexual maturity stages : Early Gametogenesis (EG), Vitellogenesis (V), Maturing (M) and Degeneration (D).

Mentions: Frequency distribution analysis of OD for each maturity stage (Figure 5) showed the gradual increase of oocyte size during sexual maturation. At PP during early gametogenesis most oocytes measured at about 6.5 μm in diameter (February-April); during gametogenesis the bulk of oocytes was 30 μm (March-May), whereas in maturity (May-August and April-July) and degeneration (September) the mode further increased to 40 μm. At FMB, two modes were observed during early gametogenesis (December-March) at 5 and 10 μm in diameter. During gametogenesis (March) oocyte diameter varied from 3.7 to 31 μm with three modes at 6, 10 and 21 μm, respectively; at this month, primary oocytes and previtellogenic oocytes coexisted. During maturation (May-August and April-July) and degeneration (after September), one mode at 40 μm was observed.Figure 5


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)

Oocyte diameter distributions for femaleCrassostrea gigasin (A) Port aux Prince and in (B) Ferme Marine de Bizerte, representing four sexual maturity stages : Early Gametogenesis (EG), Vitellogenesis (V), Maturing (M) and Degeneration (D).
© Copyright Policy - open-access
Related In: Results  -  Collection

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

Fig5: Oocyte diameter distributions for femaleCrassostrea gigasin (A) Port aux Prince and in (B) Ferme Marine de Bizerte, representing four sexual maturity stages : Early Gametogenesis (EG), Vitellogenesis (V), Maturing (M) and Degeneration (D).
Mentions: Frequency distribution analysis of OD for each maturity stage (Figure 5) showed the gradual increase of oocyte size during sexual maturation. At PP during early gametogenesis most oocytes measured at about 6.5 μm in diameter (February-April); during gametogenesis the bulk of oocytes was 30 μm (March-May), whereas in maturity (May-August and April-July) and degeneration (September) the mode further increased to 40 μm. At FMB, two modes were observed during early gametogenesis (December-March) at 5 and 10 μm in diameter. During gametogenesis (March) oocyte diameter varied from 3.7 to 31 μm with three modes at 6, 10 and 21 μm, respectively; at this month, primary oocytes and previtellogenic oocytes coexisted. During maturation (May-August and April-July) and degeneration (after September), one mode at 40 μm was observed.Figure 5

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.


Related in: MedlinePlus