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Geographical Occurrence of Milkfish, Chanos chanos (FORSSKÅL) Fry in Southern Japan


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Title: Geographical Occurrence of Milkfish, Chanos chanos (FORSSKÅL) Fry in Southern Japan
Other Titles: 南日本におけるサバヒ-仔魚の出現
Authors: Senta, Tetsushi / Hirai, Akio / Kanashiro, Kiyoaki / Komaki, Hironobu
Authors (alternative): 千田, 哲資 / 平井, 明夫 / 金城, 清明 / 小牧, 博信
Issue Date: Feb-1980
Publisher: 長崎大学水産学部
Citation: 長崎大学水産学部研究報告, v.48, pp.19-26; 1980
Abstract: A total of 216 milkfish fry was collected with a small seine along sandy beaches of 31 places in southern Japan ranging from Okinawa to the Goto Islands and Wakayama Prefecture in summer months of 1977-1979. They were considerably abundant in Tanegashima and Yakushima and southwards. They were also caught using a light, though few in number. Water temperature and density of water of the locations at which any milkfish larvae were found ranged from 24.0 to 33.2℃ and from 1.17 to 26.96σ15, respectively. They showed the same size composition as those known for the fry collected in tropical and subtropical Asian countries. The mean vertebral count in them had no statistically significant difference from those for the fry collected in Taiwan, the Philippines and Indonesia. Problems regarding the spawning grounds for the fry occurring in Japanese waters and their fate in winter remain unknown. / 1977~79年の夏に,沖縄から紀伊半島及び平戸島に至る55箇所の砂浜海岸の波打際近くで,小型の簡易引網による採集をおこない,[31箇所で総計240個体のサバヒー仔魚を得た.仔魚が多かったのは種子ケ島・屋久島以南であるが,出現の北限は太平洋岸では和歌山県宇久井,東支那海側では五島列島北端の宇久島であった.集魚灯によっても少数ながら仔魚を採集することができた.仔魚が採集されたのは水温24.0~33.2℃(多くは27.0℃以上),比重σ151.17~26.96の範囲であった.仔魚の全長範囲は10.9~16.1mm,モードは13.5~14.0mmであり,熱帯・亜熱帯の各地で種苗として採捕されているものと同じ大きさである.平均脊椎骨数(43.426±0.100)からみる限り,日本に出現するサバヒーはインドネシヤ・フィリピン・台湾などのものと同一系統群に属する.これら仔魚の起源および冬季水温低下時に辿るべき運命に関しては,現在のところ未だ結論を出す段階にない.
URI: http://hdl.handle.net/10069/30572
ISSN: 05471427
Type: Departmental Bulletin Paper
Text Version: publisher
Appears in Collections:第48号

Citable URI : http://hdl.handle.net/10069/30572

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