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Growth of Japanese temperate bass, which had inhabited in the estuary of inner part of Ariake Bay during their juvenile period

Accession number;07A0232967

Title;Growth of Japanese temperate bass, which had inhabited in the estuary of inner part of Ariake Bay during their juvenile period

Author; OTA TARO (Tottorikensaibaigyogyose)

Journal Title;Aquabiology

Journal Code:S0220B

ISSN:0285-4376

VOL.29;NO.1;PAGE.33-39(2007)

Figure&Table&Reference;

Pub. Country;Japan

Language;Japanese

Abstract;Annual larva-net collections in the Chikugo River estuary located in the inner part of Ariake Bay showed that freshwater area is one of the important nursery grounds for the early juvenile period as the local population of Japanese temperate bass Lateolabrax japonicus. Analyses of otolith microincrements and strontium/calcium (Sr/Ca) ratios were conducted for clarifying their upstream migration and maintaining mechanism of amphidoromous migration. Compared growth in early juveniles between fresh, brackish and marine waters around the Chikugo River estuary based on microincrements analyses, fish which inhabited lower salinity area tended to have high growth. In particular, fish immigrating to the freshwater area had the highest growth. Otolith Sr/Ca ratio trajectories of 0-age bass showed their fresh-water entry during the early juvenile period. In addition, size of the individuals immigrating to freshwater area tended to be larger than non-immigrants. (author abst.)

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