Growth and survival of endangered angelwing clam, Pholas orientalis fed different algal diets
Journal Title: Advances in Environmental Sciences - International Journal of the Bioflux Society - Year 2011, Vol 3, Issue 3
Abstract
Mature angelwing clam, Pholas orientalis were collected from the wild and transported to the laboratory for broodstock development. They were fed with mixed algal cultures of Isochrysis galbana, Chaetoceros sp., and Tetraselmis sp. for a period of two months and a half to determine the effects of these algal cultures on growth and survival of the broodstock. Growth in terms of length was not significantly different among the treatment groups, whereas, there was significant reduction in the weight of the clams in the group fed with a mixture of Isochrysis galbana, Chaetoceros sp., and Tetraselmis sp. Survival of the clams decreased after two months of feeding with algal diets, with significant mortality observed in groups fed with a mixture of Isochrysis galbana and Tetraselmis sp. as well as with the mixture of the three microalgae. All the water quality parameters in the rearing tanks were within the optimum levels required for optimum growth of the clams. These results showed that mixed algal diets for broodstock development in angelwing clam have no direct effect on growth but moderate effect on survival. Future studies are aimed towards determining other factors that will contribute to better growth and survival of angelwing clam broodstock in captivity as well as for the search of alternative algal diets for angelwing broodstock, particularly by exploring the microalgae that are found in their natural habitat.
Authors and Affiliations
M. Shirley Golez, Liberato Laureta, Mary Jane Apines-Amar, Christopher Caipang
Keywords
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