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Incidence of Gross Malformations and Vertebral Anomalies of Natural and Hatchery Plecoglossus altivelis
Vol. 1980, No. 1 (Feb. 1, 1980), pp. 29-35
Stable URL: http://www.jstor.org/stable/1444131
Page Count: 7
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Frequency of morphological abnormalities in ayu from the Yahagi River was about 0.15%; 442 hatchery-reared ayu showed a rate of 70.14%. The incidence of shortened vertebrae and fused vertebrae in hatchery-reared ayu were significantly higher than in natural populations. The types of malformations occurring in hatchery-reared fish were more numerous than in natural populations.