전자저널 > 전자저널 > The Influence of Water Temperature and Salinity on Filtration Rates of the Hard Clam, Gomphina veneriformis (Bivalvia)

The Influence of Water Temperature and Salinity on Filtration Rates of the Hard Clam, Gomphina veneriformis (Bivalvia)

Hyun Chool Shin, Jung Ho Lee, Hyo Jin Jeong, Jung Sick Lee1, Jung Jun Park1 and Bae Hoon Kim

Faculty of Marine Technology, Chonnam National University, Yeosu, 550-749, Korea 1Department of Aqualife Medicine, Chonnam National University, Yeosu, 550-749, Korea

The present study was performed to describe the influence of water temperature and salinity on filtration rates of the venus clam, Gomphina veneriformis, a suspension-feeding(filter-feeding) bivalve species. The calms were collected from the eastern coastal area of Sokcho, Gangneung and Jumunjin at Kangwon-do, Korea, during December 2006 and May 2007. Isochrysis galbana(KMCC H-002) cells as food organisms were indoor-cultured by f/2 medium, and were used to measure the filtration rate of clam. Filtration rates of clam were measured by indirect method. Cell concentration of food organisms were determined by direct counting cells used the hemacytometer under the light microscope. The filtration rates of clams by water temperature sharply increased with temperatures up to 15℃ as optimum temperature and above this temperature, the filtration rates decreased exponentially. Venus clams showed very low filtration rates at low salinity (10-15 psu) and maximum values at high salinity (30-35 psu). Regardless of water temperature and salt change, 2-year class clams showed high filtration rates, but low in 4-year-class. Polynomial regression curves with water temperature were shifted to the left in low temperature region. Thermal coefficient Q10 values showed much higher values at low temperature range than at high temperature range, too. These results indicate that the venus clam is more sensitive in cold water. Polynomial regression curves with salinity were shifted to the right in high saline region. According to this study, the venus clam Gomphina veneriformis, subtidal filter-feeding bivalve, was the stenothermal organism, inhabited mainly in low temperature and the stenohaline, in high saline waters.

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