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Spatial and temporal distribution of Pacific cod Gadus macrocephalus juveniles in Mutsu Bay, Japan

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Title: Spatial and temporal distribution of Pacific cod Gadus macrocephalus juveniles in Mutsu Bay, Japan
Other Titles: 陸奥湾におけるマダラ稚魚の時空間分布
Authors: Takatsu, Tetsuya1 Browse this author →KAKEN DB
Yoshida, Yasuyuki2 Browse this author
Kooka, Kouji3 Browse this author
Sugimoto, Kouichi4 Browse this author
Takahashi, Toyomi5 Browse this author
Authors(alt): 髙津, 哲也1
吉田, 裕幸2
小岡, 孝治3
杉本, 晃一4
高橋, 豊美5
Keywords: Pacific cod
spatial distribution
nursery ground
Mutsu Bay
Tsugaru Warm Current
Issue Date: Feb-2001
Publisher: 水産海洋学会
Journal Title: 水産海洋研究
Journal Title(alt): Bulletin of the Japanese Society of Fisheries Oceanography
Volume: 65
Issue: 1
Start Page: 6
End Page: 14
Abstract: The spatial distributions of Pacific cod (Gadus macrocephalus) juveniles and their food organisms were examined in Mutsu Bay from April to July during 1988-1997. In April, large larvae (≤25 mm in total length (TL)) and pelagic juveniles (>25 mm TL) were widely distributed in the bay, and were concentrated at the same depths as calanoid copepodites during daylight hours. Geographical changes in cod TLs might have been due to transport by the Tsugaru Warm Current. After mid- and late May, juveniles and calanoid copepodites occurred on the bottom. Mean densities of cod juveniles fluctuated annually in April and June, and high densities occurred when calanoid copepods were abundant. Juveniles were rarely found at temperatures >12℃, and it is likely that they migrate out of the bay after late June when temperatures increase and the abundance of prey decrease in the bay. Pacific cod use Mutsu Bay as a nursery ground, and calanoid copepodites sustain cod larvae and juveniles as their prey until mid-June. Large fluctuation in mortality of Pacific cod might occur in pelagic juvenile and subsequent stages after April in Mutsu Bay.
Type: article
Appears in Collections:水産科学院・水産科学研究院 (Graduate School of Fisheries Sciences / Faculty of Fisheries Sciences) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 高橋 豊美

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