CPUE and Body Size of Ayu Caught by Tomozuri Angling and Tenkara Net in the Shou River.
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Accession number;01A1002658
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| Title;CPUE and Body Size of Ayu Caught by Tomozuri Angling and Tenkara Net in the Shou River. |
| Author;
TAGO YASUHIKO
(Toyama Prefect. Fish. Exp. Stn.)
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Journal Title;Suisan Zoshoku
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Journal Code:Y0285A
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ISSN:0371-4217
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VOL.49;NO.3;PAGE.285-292(2001)
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| Figure&Table&Reference;FIG.8, TBL.2, REF.11 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;CPUE and body size of the ayu, Plecoglossus altivelis, caught by tomozuri angling and tenkara net (a kind of casting-type gill net), which are the main fishing methods in the Shou River, were examined from 1992 to 1996. The mean CPUE of tenkara net (18 individuals per hour) was 5.3 times as many as that of tomozuri (3.4 i./h.). The CPUE of tenkara net decreased gradually as the fishing season progressed, but that of tomozuri, which was influenced by body size of ayu and water temperature, did not. The CPUE and fishing time of tomozuri did not have a mutual relation-ship through the season. This means that it is necessary to maintain good fishing grounds for tomozuri at more than a certain level of CPUE to continue tomozuri fishing for many hours. The mean body weight of fish caught by tomozuri (29.8g) was 1.5 times as large as that by tenkara net (19.3g). The fish (body weight was more than 25g) caught by tomozuri accounted for 59.1% of the total, on the other hand, that by tenkara net only equaled 21.7% of the total. It was considered necessary to take these CPUE and body weight into consideration to manage ayu fishing grounds and resources more effectively because tomozuri competes for fishing grounds with tenkara net. (author abst.) |
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