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  • Scallop Farming in Lake Saroma

    • Lake Saroma is a major center for scallop farming in Hokkaido
    • Approximately 7,000 tons of scallops cultivated in Lake Saroma are shipped annually.
    • Furthermore, Lake Saroma is an important site for the cultivation of young scallops for the ground maki propagation in the Sea of Okhotsk, supporting the annual production of approximately 70,000 tons of scallops in the Sea of Okhotsk.
    • Here is a video showing the work involved in scallop cultivation at Lake Saroma.


  • Scallops’ planktonic larvae


    • During the period with water temperature of around 6 °C, scallops in Lake Saroma, stimulated by a short-term rise in water temperature of approximately 2 °C, release the eggs or sperms. Eggs with a diameter of approximately 80 µm are usually released around late April or early May. The planktonic larvae metamorphose into D-shaped larva with a shell after about 4 days. They grow as a plankton by feeding on smaller-sized plankton to a size of about 300 µm in shell length. After about 35 days of planktonic life stage, they attach themselves to seagrasses to complete their planktonic period. Currently, most of the scallops cultured in Japan are grown from naturally occurring planktonic larvae attached to a spat bag. Fisheries Cooperatives and Fishery Extension Offices routinely measure the abundance and size of larvae in Spring to estimate the time of attachment. Fishermen deploy spat bags based on this information to obtain enough juveniles.


  • Scallop larvae floating in the sea

    • 準備中

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