Estimated sinking rate and location on the seabed of scallop [Patinopecten yessoensis] juveniles sowed at the sea surface
1999
Yamamoto, K. (Hokkaido Univ., Hakodate (Japan). Faculty of Fisheries) | Hiraishi, T. | Kobayashi, K.
In scallop seabed sowing, fishermen release scallop juveniles into the sea at the sea surface without knowing how they sink or where they settle. In this paper, to help improve this sowing method, two experiments were carried out; 1) the terminal velocities of sinking live scallop (Patinopecten yessoensis} juveniles were individually measured in a seawater column tank, and 2) the distribution of scallop juvenile models in relation to water flow speed was observed after sinking in a uniform flow water tank. The model was maked by filling up silicon resin into one pair of scallop shells. The results show that the terminal sinking velocity was nearly described by the well known terminal velocity formula of a normal falling body, and about 90% of the juvenile models settled in an ellipse with a radius equal to twice the standard deviation in both the major and minor axes. Finally, the distribution of scallop juveniles on the seabed was estimated using a calculation under the simplest co
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