On the influence of the sunshining hours upon the maximum group of the caught porgy
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概要
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This study was made to know the influence of the sunshining hours at the seven stations, Takamatsu, Tokushima, Wakayama, Sumoto, Osaka, Kobe and Okayama, upon the group of the porgy (<I>Pagrosomus major</I>) which are caught to the maximum appearing at the four fishing grounds, namely Sanbonmatsu, Sakate, Yasuda and Fukuda. The main points of its result are as follows:<BR>It was found that in case, where the lateness or earliness of days when these fish were caught to the maximum was calculated to be±1 day, the maximum group of the caught porgy bathed daily the natural light on an average 343.1±4.2 minutes during 326 days from June 1 to April 23 of the next year; and that they daily bathed it on an average 323.7±10.5 minutes during 81 days from February 1 to April 23.<BR>And the causes of appearance of lateness or earliness of the days when porgy are caught to the maximum were found to be resulted by the length of sunshining hours for the growth of gonad and the activity of the porgy.<BR>And then, it was found that the migrating course of porgy group in the days when they are caught to the maximum can be presumed upon comparing the time of appearance of these days with the length of the sunshining hours.<BR>It was found that in cause, which produce the earliness or lateness in spawning migration movement of porgy group in the days when they are caught to the maximum, is firstly under the control of the length of the sunshining hours and secondly of the temperature of the seawater in the fishing season.
- 日本魚類学会の論文
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