放流稚アユの分散・再捕と種苗差

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タイトル別名
  • Influence of fish stocks on the recapture rate of ayu released in the River Tsubusa.
  • 放流稚アユの分散・再捕と種苗差〔英文〕
  • ホウリュウ チ アユ ノ ブンサン サイ ホ ト シュビョウサ エイブン

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抄録

To estimate the influence of fish stocks on stocking effectiveness of the ayu, Plecoglossus altivelis, the dispersal patterns and recapture rates of wild and hatchery reared fish were determined through a stocking experiment in the River Tsubusa.<br> During short-term dispersion just after release in May, two groups of hatchery fish (HR-A, HR-B) were mainly dispersed downstream, while wild fish (LAKE) swam upstream. However, another wild fish (ACCL) reared for 43 days before release had a lesser tendency to disperse than the others. Fish swimming upstream after release were larger in size for every group than those going downstream.<br> During settlement and downstream migration periods (June-October), most recapture occurred in the area within ±2 km from the point of release. LAKE distributed more upsteram and HR-A, more downstream than the others. Recapture rate during fishing season was highest in LAKE (29.2%), and HR-B (5.9%), ACCL (1.3%) and HR-A (0.8%) following in order, indicating the superiority of the wild stock (LAKE) and a disagreeable effect of temporal rearing on stocking effectiveness of wild fish (ACCL).<br> In conclusion, the stocking effectiveness represented by recapture rate depends on the dis-persal pattern after release: fish with stronger tendency to swim upstream resulted in higher re-capture rate, and are thus regarded as having a good fish quality.

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  • 日本水産学会誌

    日本水産学会誌 56 (8), 1169-1176, 1990

    公益社団法人 日本水産学会

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