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Effect of Temperature, Salinity and Density on the Egg Development of the Sunray Surf Clam, Mactra chinensis  

Min, Byeong-Hee (Busan Marine Fisheries Resources Research Institute)
Kim, Tae-Jin (Busan Marine Fisheries Resources Research Institute)
Publication Information
The Korean Journal of Malacology / v.26, no.4, 2010 , pp. 297-302 More about this Journal
Abstract
Water temperature, salinity and density on egg development of the sunray surf clam, Mactra chinensis were investigated for artificial seedling production. The required time from fertilization to D-shaped larvae were 33.8 hours in $18^{\circ}C$, 20.6 hours in $23^{\circ}C$, 18.2 hours in $28^{\circ}C$ and 15.0 hours in $33^{\circ}C$. The development duration was reduced with increasing temperature. The relationships between temperature and the required time from egg to each developmental stage were described as follows: 2-cell, 1/h = 0.1051WT - 1.4782; 8-cell, 1/h = 0.037WT - 0.3686; gastrula, 1/h = 0.008WT - 0.0521; trochophore, 1/h = 0.0041WT - 0.0235; D-shaped larva, 1/h = 0.0024WT - 0.0102. Biological minimum temperature for the egg development was estimated to be $8.0^{\circ}C$ in average. The possible range of temperature for the development of D-shaped larvae was $18-28^{\circ}C$ and optimum of water temperature for the development of egg was $23^{\circ}C$. The possible range of salinity for the development of D-shaped larvae was 20-35 psu and optimum of salinity for the development of egg was 30-35 psu over 25 psu at least. The density of fertilized egg was below 40 per 1 ml in rearing seawater for elevating the development rate from fertilized egg to D-shaped larva.
Keywords
Mactra chinensis; Egg development; Temperature; Salinity; Density; Require time; Development rate;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
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