標識放流結果によるキンメダイの成長推定
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概要
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The tagging experiments on Japanese alfonsin, Beryx splendens LOWE have been operated from 1957 to 1967 by Kanagawa Prefectural Fisheries Experimental Station at the Sagami Bay and its adjacent waters. The fish used for the experiments are of 16 to 37cm, mainly 17 to 31cm, in fork length. Using the data of time intervals from release to recapture and the fork length at the times of release and recapture, it is tried to estimate the parameters k and l∞ in von BBRTALANFFYs growth equation, lt=l∞(1-e-k(t-t0)).Where, t denotes a time and lt fork length at the time. To estimate the parameters following three methods are used, viz. (A) WALFORDs graphic method6), (B) GULLAND and HOLTs method11), and (C) FABENS method5). For using of the WAFLORDs method, the growth of the fish based on the present data is transformed to one year growth by means of proportional allotment. In using the FABENS method an electronic computer is employed because of extreme complexity of the calculations. The results of estimation by the methods given above are as follows: (A) lt=33.65(1-e-0.5051(t-t0)) (B) lt=42.9O(1-e-0.2254(t-t0)) (C) lt=34.78(1-e-0.4572(t-t0)) The estimations of k and l∞ by method (C) are also made for the data classified by the time interval between release and recapture, fork length at the time of release, and fishing grounds. As the result it is shown that the estimated instantaneous growth rates of the tagged fish of about 24cm in fork length are the same in those classified groups. The fact is also found that the over-estimation of l∞ is associated with the under-estimation of k, and vice versa, and the relationship between k and l∞ can be expressed as k(ll∞-24)=3.657.
- 公益社団法人 日本水産学会の論文