Abstract
In the present paper the relation between the scale length and fork length of yellow-tail (Se-riola quinqueradiata T. et S. ), and average fork length estimated by calcula??ion at the time when each ring of scale is formed are e??teemed, based upon the data of 190 specimens (30.5_105.0cm. in the fork length, 468.7g._18.8kg. in the body weight).aken by t??ap-nets settled at the ground; of Ine, Niizaki, Naryu and Tai in the western region of Wakasa Bay during the period from the end of November of 1954 to the end of January of 1955. The res??lts obtained are the following;
1. It seems to me that the resting zone is formed once a year, in consequence the zone will show the annual ring (Fig. 1).
2. The relation between the scale length and fork length is given by the following regression equation as shown in Fig. 2, that is;
L=16.8?? T+6.9??.
where L: Fork length in cm. T: Scale length in mm.
3. The average fork length estimated by calculation at the time when each ring is formed is about 34cm. at the 1st ring (1 age), 53cm. at the 2nd (2 age), 71cm. at the 3rd (3 age), 86cm. at the 4th (4 age) and 99cm. at the 5th (5 age), respectively (Table 1).
