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ID 30226
file
title alternative
Predation by Fishes and Seabirds on Juvenile Chum Salmon (Oncorhynchus keta) in Coastal Waters of Japan : a Review
creator
Kaeriyama, Masahide
subject
サケ
稚魚
幼魚
捕食
魚類
ウグイ
ホッケ
ヒラメ
カラフトマス
海鳥類
ウトウ
ウミネコ
日本沿岸
総説
NDC
Zoology
abstract
90種以上の魚類が日本沿岸水域でサケ幼稚魚と一緒に分布するが, サケ幼稚魚の捕食者と認められたのは汽水域でウグイ, 海洋でホッケ, ヒラメおよびカラフトマスの4種のみであり, 日本沿岸域におけるサケ幼稚魚の魚類による捕食減耗は著しく少ないと推定される. 一方, 海鳥類のウトウとウミネコはサケ幼稚魚の有力な捕食種と考えられ, 繁殖期のウトウは幼稚魚を雛の餌とするし, ウミネコの分布域と幼稚魚の分布はよく重なる.
abstract
This review examines available literature on the fauna and diets of fishes and seabirds in coastal waters of northern Japan from spring to summer and discusses the impact of fish and seabird predation on chum salmon (Oncorhynchus keta) populations in Japan. Over 90 fish species have been reported to occur with chum salmon juveniles. Among these species, fishes recorded as predators are only 4 species: Japanese dace (Tribolodon hakonensis) at estuaries, and Arabesque greenling (Pleurogrammus azonus), Japanese flounder (Paralichthys olivaceus), and pink salmon (O. gorbuscha) at sea. Fish predation may cause substantial loss of juveniles at sites where these fishes, particularly Arabesque greenling and Japanese dace, are abundant. However, there is no evidence that fish predation has much impact on the number of returning adult salmon in Japan. The release of hatchery-reared, large-sized juveniles possibly reduces the mortality by fish predation. Rhinoceros auklets (Cerorhinca monocerata) and black-tailed gulls (Larus crassirostris) have been recorded as predators of juvenile chum salmon. These seabirds breed abundantly in northern Japan, and the impact of their predation on Japanese chum salmon populations may be significant. More field and experimental work is needed to evaluate the mortality of Japanese chum salmon juveniles caused by predation by fishes and seabirds.
journal title
北海道さけ・ますふ化場研究報告
issue
Issue 49
start page
41
end page
53
date of issued
1995-03
publisher
水産庁北海道さけ・ます・ふ化場
issn
0441-0769
ncid
language
jpn
nii type
Journal Article
HU type
Journal Articles
DCMI type
text
format
application/pdf
text version
publisher
rights
Copyright (c) 1995 独立行政法人水産総合研究センター さけますセンター
relation is version of URL
http://salmon.fra.affrc.go.jp/kankobutu/srhsh/data/srhsh366.htm
department
Graduate School of Biosphere Science



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