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Regional and interannual variations in spawning activity of Pacific saury Cololabis saira during northward migration in spring in the north‐western Pacific
Author(s) -
Kurita Y.
Publication year - 2006
Publication title -
journal of fish biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.672
H-Index - 115
eISSN - 1095-8649
pISSN - 0022-1112
DOI - 10.1111/j.1095-8649.2006.01159.x
Subject(s) - spawn (biology) , biology , fishery , spring (device) , oceanography , pacific ocean , cohort , medicine , geology , mechanical engineering , engineering
Regional and interannual variations in spawning activity of Pacific saury Cololabis saira during the northward migration in spring were investigated for 1995–1997 in the north‐western Pacific. Only females with a large body size (≥270–290 mm knob length) appeared to spawn. Almost all females in this cohort were actively spawning in a region of sea surface temperature ( T SS ) >18° C, the proportion of active spawners appeared positively related to T SS in a region of 13° C < T SS ≤ 18° C, and no females were spawning in the region of T SS ≤13° C. Although this relationship between spawning activity and T SS was common in all years, the distribution of females in the large‐size cohort among the regions varied interannually. Consequently, the proportion of active spawners among adult females showed considerable interannual variations.