2026-03-11T06:55:47Z https://fra.repo.nii.ac.jp/oai

oai:fra.repo.nii.ac.jp:02001771 2025-12-11T00:56:10Z 12:14:1716950587014

籠漁獲によるヒメエゾボラの利用可能資源密度の推定 An Estimation of the Density of the Available Stock of a Sea Snail, Neptunea arthritica, by Trap Fishing 伊藤, 博 イトウ, ヒロシ Ito, Hiroshi 立沢, 静夫 タチザワ, シズオ Tachizawa, Shizuo A sea snail, Neptunea arthritica, was subjected to experiments of repeated fishing in July 1980 at ten stations in Lagoon Huren-ko, using seven trapping baskets at each station. The cumulative catch fits a cologarithmic curve; so, an estimate was made of the available population within the gathering area of the traps. Two cases were assumed, namely, a small and a large gathering area. As a result, the density of the available stock of snails longer than 40 mm in shell length and heavier than 10 g in body weight was calculated. It ranged from 0.30-2.84 and from 0.35-2.61 individuals/m2; from 11.4-107.9 and 13.3-99.2 g/m2 in the former and the latter case, respectively. ヒメエゾポラの資源密度を知るため,風蓮湖内の10定点で1980年7月につぶ籠による試験漁獲を行った。1定点につき7籠を用い2週間にわたり漁獲を毎日反復した。その結果,この籠により漁獲される個体(利用可能資源)の大きさは殻長40mm,体重10g以上であり,また,累積漁獲数の経日変化は余対数曲線によく適合した。この回帰式から得た利用可能資源個体数と籠の誘集範囲の2通りの推定面積とから利用可能資源密度をそれぞれ0.30~2.84または0.35~2.61個体/m2,11.4~107.9または13.3~99.2g/m2と試算した。 departmental bulletin paper 北海道区水産研究所 Hokkaido Regional Fisheries Research Laboratory 1981-08 北海道区水産研究所研究報告 46 113 119 Bulletin of the Hokkaido Regional Fisheries Research Laboratory AN00124758 0513-2541 https://fra.repo.nii.ac.jp/records/2001771 eng hnf_k_46_113 日本農学文献記事索引(agriknowledge) https://agriknowledge.affrc.go.jp/RN/2010234283 metadata only access