長良川の魚相, 現状と過去との比較 : 水質汚染との関係

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GOTO, Miyako and Tadashi GOTO (Seki High School and Asahigaoka Lower High School, Seki City, Gifu Pref.) Fish fauna in River Nagaragawa and its change for the last several years in relation to river pollution. Jap.J.Ecol. 21,254-264 (1971) Fish fauna were investigated quantitatively in the middle reaches of the Nagaragawa River, Gifu Prefecture, from May 1967 to August 1971,by using a small weir-trap "Noboriochi". As the result 1 species of lamprey and 35 species of actinopterygian fishes were recorded. The number of fishes collected changed remarkably from year to year. Among the ten species of dominant fishes, the number of a goby (Rhinogobius flumineus), a loach (Niwaella delicata), chubs (Zacco platypus, Z.temmincki), a gudgeon (Psedogobio esocinus) and a bullhead (Liobagrus reini) decreased while a certain loach (Cobitis biwae) rather increased, but a gudgeon (Gnathopogon elongatus) and a dace (Tribolodon hakonensis) did not change in quantity during the years. The fish fauna and their populations were much different and remarkably lower compared with that of ten years before. Their change and difference may be caused not only by the change of environmental conditions in the river estuary affecting anadromous and amphidromous fishes but also by the effect of the pollution by the effluents of the pulp and paper mills.
日本生態学会の論文
1971-12-31