鱗の成長線数によるコイの年齢査定の試み

概要

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In an attempt to determine the age of carp, the monthly change in growth line formation throughout 16 months afther birth and the relationship between age and the total number of growth lines were investigated using scales in previously defined positions of the carp, Cyprinus carpio L. The growth lines were mainly formed from May to September and the formation was extremely reduced thereafter until April of the next year. It was difficult to distinguish the annulus because of reduced formation of the growth lines in winter and the occasonal formation of a simulated annulus in some specimens. Estimation of the total number of increase growth lines was carried out on scales obtained from defined position on carp of various ages. The number increased linearly until 5 years old and the rate of gradually slowed down and became markedly decreased in carp older than 10 years old. Use of the total number of growth lines for age analysis of carp was discussed.
社団法人日本動物学会の論文
1981-03-25