With a decrease in the domestic catches of Ruditapes philippinarum, suspended culture is a potential approach to increase its production. We investigated the establishment of suspended clam culture in Suttsu fishing port, Hokkaido. Cages accommodating 100 clams (mean shell length 28 mm) were suspended in the “stocking area” at the back of the port and the “fairway area” at the center of the port. Rearing periods were November 2017–October 2018 in the former and November 2018–October 2019 in the latter. Shell length was measured every month; water temperature, chlorophyll-a concentration, and flow velocity around cages were measured regularly. The mean shell length at the end of the experiments was 34 mm in the stocking area and 41 mm in the fairway. Although the water temperature, chlorophyll-a concentration, and advective components of flow velocity did not differ between the sites, the fluctuating component of flow velocity was higher in the fairway than in the stocking area. This suggests the former is more suitable for clam growth than the latter in terms of food supply. Therefore, the introduction of suspended culture in the fairway area of Suttsu fishing port is expected to improve the production efficiency of clam fishery.

随着菲律宾蛤仔的国内捕获量的减少，悬浮培养是增加产量的潜在途径。我们调查了北海道Suttsu渔港悬浮蛤文化的建立。容纳100只蛤（平均壳长28毫米）的笼子悬挂在港口后面的“放养区”和港口中心的“航道区”。前者的饲养期为2017年11月至2018年10月，后者为2018年11月至2019年10月。每月测量壳长；水温，叶绿素a定期测量笼子的浓度和流速。实验结束时，平均壳长在放养区为34毫米，在球道为41毫米。尽管水的温度，受叶绿素一个浓度，和流速的对流部件没有在站点之间不同，流速的波动分量是在球道比在贮存区域更高。这表明就食物供应而言，前者比后者更适合蛤类的生长。因此，在苏津渔港航道区域引入悬浮养殖有望提高蛤类渔业的生产效率。