Study on tagging techniques for Japanese halfbeak [Hyporhamphus sajori]
2002
Tsuji, T. (Ishikawa-ken. Fisheries Experiment Station, Noto (Japan)) | Okei, N. | Shikata, T.
In order to establish tagging techniques for Japanese halfbeak Hyporhamphus sayori, effects of handling (sampling, anesthesia, tagging, medicinal bath) on fish mortality were investigated. Experimental fish were collected by angling (fork length: 15-19cm, 0-years old). Ribbon tags were attached to fish on some body positions. The fish were held in one cube m tanks from three weeks to one month. Fish mortality and number of shed tags were recorded during the experimental period. Results obtained from the present experiment are: Catching and tagging operations would inflict damage on halfbeak, therefore extreme care is needed on handling. Over one-week holding in the tank after operation reduced fish mortality. Fish mortality and rate of shedding on tagging at isthmus were not significantly different from those of untagged controls. Those results indicate that tagging to the isthmus is effective.
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