豊後水道におけるマサバとゴマサバの出現様式

Spatiotemporal distribution of two mackerel species, Scomber japonicus and Scomber australasicus, in the Bungo Channel, western Japan

Goto Naoto

Hashida Daisuke

Nakao Hiroki

Tomiyama Takeshi

日本水産学会誌

NIPPON SUISAN GAKKAISHI

2007-2017年における豊後水道でのマサバ・ゴマサバの漁獲情報をもとに，両種の分布特性を調べた。豊後水道の北部ではマサバ，南部ではゴマサバが主体で漁獲されていた。東（愛媛県）側ではより北側にゴマサバが出現し，水温環境の水道東西での非対称性との関連性が示唆された。また，両種の当歳魚は4月から6月にかけて1歳魚以上に比べて沿岸域に分布が偏っていたが，7月には沖合にも出現するようになり，成長に伴い沿岸から沖合へ生息場所を拡げることが示唆された。

To reveal the distribution patterns of mackerel in the Bungo Channel, western Japan, we investigated catch statistics and specimens of chub mackerel Scomber japonicus and spotted mackerel Scomber australasicus sampled at fish markets from 2007 to 2017. Chub mackerel were caught mainly in the northern part of the Bungo Channel while spotted mackerel were caught in the southern part of the channel. Spotted mackerel were observed at higher latitude in the eastern channel (Ehime Prefecture) compared to the western side (Oita Prefecture). This pattern suggested a correlation with the asymmetry in water temperature between the eastern and western sides of the channel. The distribution of 0-year-old mackerel was observed chiefly around nearshore areas from April to June, and thereafter it gradually shifted to offshore areas in July, indicating that 0-year-old fish expanded their habitat to offshore waters as they grew.

浮魚

サバ属

成長

分布

jpn

日本水産学会誌

© 2020 公益社団法人日本水産学会

© 2020 by The Japanese Society of Fisheries Science

[ISSN] 0021-5392

[ISSN] 1349-998X

[DOI] 10.2331/suisan.19-00043

[DOI] https://doi.org/10.2331/suisan.19-00043