Studies on the stocks of some economically important marine fishes caught around Amakusa. VI. On snapper, Pagrosomus major (Temminck & Schlegel), of Amakusa
1949 Volume 15 Issue 4 Pages 158-160
Details
1949 Volume 15 Issue 4 Pages 158-160
The present work was carried out at Tomioka from May to October in 1947 to consider the stock of snapper, Payrosomus major (Temminck & Schlegel) and to observe its variation of fatness. Judging from its growth rate, the mentioned fish of Amakusa is consdered to stand as a distinct stock from those already discussed. The values of k and n in a formula, W=kLn (W, body weight in g; L, body length in mm), are nearly 1.88×10-4 and 2.697 respectively. Then, we computed the value of k for each individual, making n equal to 2.679, and obtained from 1.07×10-4 to 2.86×10-4. With regard to the relation of such a value of k to body length, the following fact can be seen; namely the value of k becomes minimum between 250mm and 300mm in body length, while it shows a maximum between 450mm and 500mm. Moreover, it indicates a seasonal variation, being higher in May and June than in July and August.
