魚類の年齢査定(豫報II)

概要

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On the basis of rings formed on the surface of centrum of vertebrae, ages of 2 species of yellow tail and scad were determined as follows. (1) Yellow tail-Seriola quinqueradiata (T. & S.): In(cm)=6•3, rn (mm)-1•6, where r1=5•1, r2=7•4, r3=9•4 and r4=11•3. (2) Yellow tail-Seriola aureovittata (T. & S.): ln=5•2 rn+0•6, where r1=5•1, r2=8•4, r3= 11•5 and r4=14•0. (3) Scad-Trachurus japonicus (T. & S.): In=3•6, rn+2•3, where r1=2•0, r2=3•1, r3=4•3 and r4=5•4. In cm is the body-length of the n-aged fish when the n-th ring, of which the radius is rn mm, is completed.