2026-03-10T21:47:37Z https://fra.repo.nii.ac.jp/oai

oai:fra.repo.nii.ac.jp:02014528 2025-06-18T05:20:44Z 1:7:1745476182026

アカアマダイ人工種苗の巣穴形成能力の発現 Development of Burrowing Behavior in Hatchery-Reared Red Tilefish Branchiostegus japonicus 本藤, 靖 益田, 玲爾 津崎, 龍雄 種苗生産した全長50～140mmサイズのアカアマダイの稚魚を用いて,果穴形成能力の発現について実験を行った。全長50mmサイズでは巣穴の形成は観察されなかったが,全長75～115mmサイズでは,多くのトンネル様の巣穴の形成を観察した。しかし,全長140mmサイズでは巣穴の形成は見られず,長い溝が水槽壁面と泥の境目に形成された。全長75mmサイズのアカアマダイ稚魚は,トンネル様の巣穴形成を行う最小サイズと考えられ,全長115mmサイズまでその行動は継続した。本種にとって巣穴形成は,生態的に重要な意義を持っと思われ,全長75～115mmサイズは,その能力が発現する重要な時期と考えられた。 Developmental changes in burrowing behavior were studied in the red tilefish. Five different size classes 50, 75, 90, 115 and 140 mm in total length (TL), were used in the experiment. One or three individuals were stocked in black polyethylene tanks (100 or 500 liter depending on fish size) with 3-5 replications of tanks under each condition. The tank bottom was covered with 5-7 cm depth of muddy silt. Fish were kept in those tanks for three days and the burrowing behavior was observed. Fish in the 50 mm size group showed no burrowing behavior. Fish in the 75 mm group formed either tunnel-like burrows or canals along the tank wall. Tunnel-like burrows were also observed in the 90 mm and 115 mm groups, but not in the 140 mm group; the fish in the largest group formed only canals. Our observation suggests that the formation of tunnel-like burrows in red tilefish first appear at a size of 75 mm TL, and continue until reaching 115 mm TL. Considering that burrows of this species serve as a means of shelter from predators, fish in the size range of 75-115 mm TL may be most suitable for use in stock enhancement of this species. ファイル名末尾が”_abs_j”のファイルは和文要旨 journal article 日本栽培漁業協会 2002-04 VoR application/pdf application/pdf 栽培漁業技術開発研究 2 29 85 89 Technical Reports of Japanese Sea Ranching Programs AN00394140 0911-6753 https://fra.repo.nii.ac.jp/record/2014528/files/saibai_g_29_2_85.pdf https://fra.repo.nii.ac.jp/record/2014528/files/sai_g_29_2_85_abs_j.pdf https://fra.repo.nii.ac.jp/records/2014528 jpn saibai_g_29_2_85 open access