Intermediate culture of Manila clam spat and stocking efficiency of the spats in Mangoku-ura

Representative Organization: Tohoku University

2013/08/01 - 2013/12/31

Mangoku-ura
0040_R01_map01.pdf

Field survey

The aim of the project is to demonstrate the efficient Manila clam seed production and to contribute to sustainable clam fishery. Mangoku-ura where formation of tideland is planed is emploied as a model of water for the experiment. The settled spats produced from adalut Manila clam of Mangoku-ura origin is introduced into the advanced system for intermediate culture in Mangoku-ura to verify an intensive and efficient production by the system. The cultured spats are stocked on the tideland by various methods to verify a high stocking efficiency. The project is conducted by the collaboration with Prefectural government, fishery cooperative and neighboring high school for fishery.

The verification experiment of Manila clam seed production is concentrated in an efficient intermediate culture of seed using a new devise FLUPSY, because of delay of formation of tideland. It took 100 days to raise the seed of 1 mm to 10 mm, which is suitable for the stocking seed, and survival rate during the period was low with 25%. On the other hand the seed of 2 mm grew to 10 mm for shorter period of 60 days with 50 % of higher survival rate. The intermediate cultured seeds with 10 mm are cultured and stored in the net bag with gravel and pulverized oyster shell at tidal zone.

FY2013 Intermediate culture of Manila clam spat and stocking efficiency of the spats in Mangoku-ura