Effect of stocking densities and levels of depth on growth rate of freshwater pearl mussel (Chamberlainia hainesiana (Lea, 1856)) in Vachiralongkorn reservoir, Kanchanaburi province
1996
Niphawan Nateneramitdee
Study on the effect of stocking densities and levels of depth on growth rate of freshwater pearl mussel [Chamberlainia hainesiana (Lea, 1856)] in Vachiralongkorn reservoir, Kanchanaburi province by Factorial in Completely Randomized Design with 9 treatments and 3 replications were carried out from December, 1994 to November, 1995. C. hainesiana were reared 5, 10 and 15 mussels per 900 square cm at 2, 5 levels of depth and at bottom of the rearing site. C. hainesiana were weighed and measured for shell size every month as well as species composition, abundance of plankton and water quality. The first highest growth rate rank of C. hainesiana was found at 2 metres level, 5 mussels/900 square cm stocking density. Increased rate of weight were to 0.233 g/day shell length, height and width were equal to 0.087, 0.059 and 0.031 mm/day, respectively. The second highest growth rate rank was found at the mentioned level and stocking density were 10 and 15 mussels/900 square cm. Which the total 3 replications had 100 percent survival rate. The total planktons were found in nine phyla, 45 genera and 2 groups as phytoplanktons in 6 phyla and 38 genera as zooplankton in 3 phyla, 7 genera and 2 groups. The most abundance of plankton from high to low were Chlorophyta, Bacillariophyta and Pyrrophyta. There were found most of plankton from high to low at 2 metres depth level, 5 metres and bottom level by having more abundance in phytoplankton than zooplankton in each depth level. Moreover, physio-chemical properties of water in Vachiralongkorn reservoir was found to be at optimum.
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