報告書番号

485025

タイトル（和文）

淡水魚の産卵行動におよぼす濁水の影響－ニジマス・アマゴの性行動と濁り－

タイトル（英文）

EFFECTS OF TURBID WATER ON THE SEXUAL BEHAVIOUR OF SALMONIDS,SALMO GAIRDNERI AND ONCORHYNCHUS RHODURUS

概要 （図表や脚注は「報告書全文」に掲載しております）

ニジマスとアマゴの性行動におよぼす濁りの影響について明らかにするために，水中に設置した電極により，両種の性行動に起因する電位変化を導出し，行動の頻度と濁度との関係について検討した。その結果，３０ｐｐｍ未満の濁水は，両種の性行動に影響をおよぼすことは少ないと推察された。

概要 （英文）

IN ORDER TO ELUCIDATE THE EFFECTS OF TURBID WATER ON THE SEXUAL BEHAVIOUR OF THE SALMONIDS,RAINBOW TROUT,SALMO GAIRDNERI AND AMAGO,ONCORHYNCHUS,THE PRESENT STUDY WAS CARRIED OUT. THE RESULTS OBTAINED WILL BE SUMMARIZED AS FOLLOWS; 1.RAINBOW TROUT (1)FREQUENCY OF COURTSHIP BEHAVIOUR OF MALE BEGAN TO DECREASE AT CA. 30PPM OF TURBIDITY AND THE BEHAVIOUR SCARCELY DONE IN TURBID WATER OF 40PPM OR MORE. (2)FREQUENCY OF DIGGING BEHAVIOUR OF FEMALE BEGAN TO DECREASE AT CA. 40PPM OF TURBIDITY. (3)THE HIGHEST TURBIDITY WAS 25PPM,SPAWNING WAS OBSERVED IN THE EXPERIMENTS. 2.AMAGO (1)FREQUENCY OF COURTSHIP BEHAVIOUR OF MALE BEGAN TO DECREASE AT CA. 30PPM OF TURBIDITY. (2)DIGGING BEHAVIOUR OF FEMALE WAS SCARCELY OBSERVED IN TURBID WATER OF 30PPM AND MORE. (3)THE HIGHEST TURBIDITY WAS 23PPM,SPAWNING WAS OBSERVED IN THE EXPERIMENTS. FROM THESE RESULTS MENTIONED ABOVE,IT IS ESTIMATED THAT A SHORT TERM TURBID WATER UNDER 30PPM OF TURBIDITY SCARCELY AFFECT ON THE SEXUAL BEHAVIOUR OF THE TWO SALMONIDS.

報告者

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