A Characteristic on the Sediment Immersion Activity of Cockle, Fulvia mutica Spat
Si-Woo Lee, Wi-Sik Kim, Jung Kim, Deok Chan Lee and So Hee Kim
Oceanic Climate & Ecology Research Division, NIFS, Busan 46083, Korea, Department of Aqualife Medicine, Chonnam National University, Yeosu 59626, Korea, The Fisheries science Institute, chonnam National University, Yeosu, 550-749, Korean Shefish Researc

This study investigated the characteristics of sediment immersion activity in order to utilize them as a basis for suitable site selection when releasing cockle, Fulvia mutica spat. The cockle, F. mutica spat were spawned from natural broodstock in April, and the cockle spat (shell length 17.96 ¡¾ 4.78 mm) were reared in a 2 ton FRP square tank (300 ¡¿ 100 ¡¿ 70 cm) for 185 days in a flow-through system. To investigate the sediment immersion activity characteristics, 30 were placed in each sediment grain size of fine sand (0.12 ¡¾ 0.03 mm), medium sand (0.93 ¡¾ 0.24 mm) and coarse sand (2.69 ¡¾ 0.67 mm), and the immersion rate and immersion time of each individual spat were investigated. As a result, the in rate of each 10-20 mm cockle spat was more than 90% within 60 minutes except for the coarse sand, and the immersion time was more than twice as long.

  
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