Growth, condition and gametogenic activity of the Pacific oyster Crassostrea gigas in Algeria
Sustainable oyster production of Crassostrea gigas in Algeria requires information about growing, condition and reproduction. The paper documents growth, condition index (CI), and describes the reproductive cycle of oysters cultivated in open sea using plastic bags suspended from long lines. The stu...
| Main Authors: | , , , |
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| Format: | Text |
| Language: | unknown |
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Station Biologique de Roscoff (SBR)
2017
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| Online Access: | https://dx.doi.org/10.21411/cbm.a.cd206125 http://application.sb-roscoff.fr/cbm/doi/10.21411/CBM.A.CD206125 |
| Summary: | Sustainable oyster production of Crassostrea gigas in Algeria requires information about growing, condition and reproduction. The paper documents growth, condition index (CI), and describes the reproductive cycle of oysters cultivated in open sea using plastic bags suspended from long lines. The study was performed on juveniles (May 2011-February 2012), and adults (October 2012-October 2013). Gametogenesis was described through the histological study of the gonad and oocyte cohort analysis. The growth of C. gigas juveniles was described using the Schnute growth model. CI of juveniles was low during the cultivation period. Length and weight of adult oysters ranged from 93.9 to 109.1 mm and 64.1 to 132.3 g respectively. CI was satisfactory (> 50). The reproductive cycle of C. gigas began in December with several oocytes cohorts. Oocytes were growing during January-February and ripening occurred in March-May. The main spawning took place in June when temperature was increasing, and spawning of less intensity was observed during July-October. Spring phytoplankton blooms seem to provide energy for gonad development. These results may serve as baseline data for the development of aquaculture programs in Algeria. |
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