Seasonal changes in hydrographic factors and breeding in two popula nons of crassostrea tulipa (lamarck)
1991
Obodai, E.A., Department of Zoology, University of Cape Coast, Ghana | Yankson, K., Department of Zoology, University of Cape Coast, Ghana | Blay, J.Jr., Department of Zoology, University of Cape Coast, Ghana
The seasonal changes in breeding activity of two populations of Crassostrea tulipa (Lamarck) in Ghana, and some hydrographic factors of their brackishwater habitats were investigated between February 1988 and April 1989. Temperature and pH were rehtively stable and their fluctuation patterns were similar in both habitats. Transparency and salinity fluctuations were less apparent in the lagoon, but a distinct seasonal pattern occurred in the estuary where nigh and low regimes corresponded with the dry and wet seasons, respectively. The variations in dissolved oxygen concentrations did not fit a well-defined seasonal pattern in both water bodies. The oysters bred continuously in the lagoon while the reproductive activity was seasonal in the estuary where the non-breeding season coincided with the period of low transparency and salinity. However, there was an apparent lack of direct relationship between individual hydrographic factors and the breeding of oysters in the lagoon
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