Growth of Engraulid Fish (Coilia nasus TEMMINCK et SCHLEGEL), in Ariake Sea
1990 Volume 38 Issue 2 Pages 135-145
Details
1990 Volume 38 Issue 2 Pages 135-145
The present report deals with age and growth estimation based on ring marks of scales and frequency distribution of body length at intervals of one month and on each number of scale mark for Coilia nasus. Materials used on this study consist of 1235 individuals rainging from 29-358mm in body length, collected by larva net, set net and gill net in the Chikugo River and in Ariake Sea during the period from 1966 to 1985.
Several scales taken from the back side above the pectoral fin were used for measurement.
Results obtained are as follows.
1.The relationship between body length (mm) and scale radius (mm) was discribed by the following equations.
R=0.0110BL-0.2190 (Female)
R=0.0108BL-0.1952 (Male)
2.First mark was formed from November to March (5-9 months after hatching out), the second from June to December, the third from May to December, the froth in June, November and December.
3.Females of this fish grow up to 170-210mm in body length after one full year, 220-282mm after full two years and 260-320mm after full three years.
Males attain 150-195mm after one full year, 200-270mm after full two years and 238-305mm after full three years.
4.Spowning groups consist of mainly two and three years old fishes.
