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Correlation of changes in seasonal distribution and catch of red sea bream Pagrus major with winter temperature in the eastern Seto Inland Sea, Japan (1972–2010)
Fisheries Oceanography ( IF 2.6 ) Pub Date : 2019-10-13 , DOI: 10.1111/fog.12432
Masayuki Yamamoto 1 , Hiroaki Omi 2 , Naotaka Yasue 3 , Akihide Kasai 4
Affiliation  

Red sea bream Pagrus major is a commercially important fish in Japan. In eastern Seto Inland Sea (SIS), the catch has increased from 297 tons in 1972 to 2,039 tons in 2010. We examined the relationship, 1972–2010, between increase in catch and winter temperature, based on the catch in February and March and the lowest water temperature at 10 m depth. In 1972–1986, the lowest water temperatures in the inner SIS areas (Osaka Bay, Harima‐nada, and Bisan‐seto) were <8°C, which is physiologically unfavorable for red sea bream. However, in 1987–2010 temperatures were generally ≥8°C. In the inner areas, the catch during winter had been minimal until the early 1980s, presumably because most red sea breams moved to the Kuroshio‐influenced (warmer) Kii Channel area. However, the winter catch in the inner areas of SIS increased from the late 1980s with warm winters. In addition, the catch between April and June, the spawning season, increased in the inner areas from the 1990s, and the catch rate of the inner areas was more than twice higher in the 2000s than in the 1980s. The results suggest that expansion of the distribution area during winter due to warm winter and increase in egg production in the inner areas greatly contributes to the increasing in catch in the eastern SIS.

中文翻译:

日本濑户内海东部(1972-2010年)红鲷Pa草主要季节分布和捕获变化与冬季温度的相关性

红鲷Pagrus Major是日本的重要商业鱼类。在濑户内海东部(SIS),渔获量从1972年的297吨增加到2010年的2,039吨。基于2月和3月的渔获量,我们研究了1972-2010年渔获量与冬季温度之间的关系。 10 m深度的最低水温。1972–1986年,SIS内部地区(大阪湾,Harima-nada和Bisan-seto)的最低水温<8°C,这在生理上不利于红鲷鱼。但是,在1987–2010年,温度通常≥8°C。在内陆地区,直到1980年代初冬季的捕捞量一直很小,大概是因为大多数红鲷迁徙到了受黑潮影响(温暖)的纪伊海峡地区。然而,由于温暖的冬季,自1980年代后期以来,SIS内部的冬季捕获量有所增加。此外,从1990年代开始,内陆地区的产卵季节在4月和6月之间的捕获量增加了,2000年代内陆地区的捕获率是1980年代的两倍多。结果表明,由于冬季暖和,冬季分布区域的扩大以及内部区域产蛋量的增加,极大地促进了东部SIS渔获量的增加。
更新日期:2019-10-13
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