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Vertical position, specific gravity and swimming ability of Pacific cod Gadus macrocephalus yolk-sac larvae reared at four temperatures

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Title: Vertical position, specific gravity and swimming ability of Pacific cod Gadus macrocephalus yolk-sac larvae reared at four temperatures
Authors: Li, Zhe Browse this author
Yamamoto, Jun Browse this author →KAKEN DB
Sakurai, Yasunori Browse this author →KAKEN DB
Keywords: Pacific cod
Yolk-sac larvae
Various temperatures
Vertical position
Specific gravity
Vertical movement rate
Issue Date: Sep-2015
Publisher: Springer
Journal Title: Fisheries science
Volume: 81
Issue: 5
Start Page: 883
End Page: 889
Publisher DOI: 10.1007/s12562-015-0911-6
Abstract: Vertical position and movement rate were measured in the yolk-sac larvae of the Pacific cod Gadus macrocephalus at different rearing temperatures (3, 5, 7, and 9 A degrees C) and an identical temperature of 5 A degrees C in experimental columns during the initial 3 days post-hatch (dph). Larval specific gravity was also measured through sinking velocities. Yolk-sac larvae swam upward and initially (0 dph) remained in the upper section of the experimental column through intermittent upward swimming, and gradually moved to near-neutral buoyancy at 3 dph at corresponding rearing temperatures. Rearing temperature significantly affected the swimming ability: at 0 dph, vertical movement rates measured at 5 A degrees C were low in the yolk-sac larvae reared at warm temperatures. However, no such difference was observed at 3 dph. The difference in vertical movement rate may have resulted from the temperature-mediated body sizes (standard length) and yolk-sac sizes (yolk-sac volume) at hatching. Specific gravity did not change for the varying temperatures during the initial 3 days, but decreased as ontogeny progressed. Therefore, we suggest that Pacific cod yolk-sac larvae achieve a demersal-pelagic habitat transition through upward swimming and increasing buoyancy.
Rights: The final publication is available at Springer via http://dx.doi.org/10.1007/s12562-015-0911-6
Type: article (author version)
URI: http://hdl.handle.net/2115/62748
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: 桜井 泰憲

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