Species composition and body size of Macrobrachium prawns caught using funnel traps during the fishing season in the downstream freshwaters of the Shimanto River
2019
Hiraga, H. (Nishinihon Institute of Technology, Kochi, Kochi (Japan))
To obtain information regarding the catch of Macrobrachium prawns in the Shimanto River, Kochi Prefecture, Japan, the species composition and body size of Macrobrachium prawns caught using funnel traps were investigated at St. 1 and St. 2 (11 km and 28 km upstream from the river mouth, respectively). Most of the catch comprised M. formosense, followed by M. japonicum with very less catch of M. nipponense. The body size of M. formosense and M japonicum at St. 2 was larger than that at St. 1. The proportion of males of these two species was high at both the stations, accounting for 76-92% of M. formosense and 67-77% of M. japonicum.
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