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Comparison of the nutritional transition date distributions of marbled sole larvae and juveniles in Hakodate Bay, Hokkaido

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Title: Comparison of the nutritional transition date distributions of marbled sole larvae and juveniles in Hakodate Bay, Hokkaido
Authors: Joh, Mikimasa Browse this author
Takatsu, Tetsuya Browse this author →KAKEN DB
Nakaya, Mitsuhiro Browse this author
Yoshida, Naoto Browse this author
Nakagami, Masayasu Browse this author
Keywords: Diet
Larvae and juveniles
Marbled sole
Nutritional transition
Otolith microstructure analysis
Oyashio coastal water
Pseudopleuronectes yokohamae
Issue Date: May-2009
Publisher: Springer Japan
Journal Title: Fisheries Science
Volume: 75
Issue: 3
Start Page: 619
End Page: 628
Publisher DOI: 10.1007/s12562-009-0086-0
Abstract: To examine survival processes in marbled sole Pseudopleuronectes yokohamae larvae, nutritional-transition-date distributions (NTDDs) were compared between larvae and large juveniles (LJs) in Hakodate Bay from 2001 to 2003. NTDDs were used instead of hatch-date distributions because the onset of increment formation coincides with the timing of the transition from endogenous to exogenous nutritional sources for marbled sole. LJs were defined as being large enough to be safe from predation by the sand shrimp Crangon uritai. In 2001 and 2002, the ranges of the NTDDs of LJs largely overlapped with those of the larvae. However, in 2003, the early cohort (those whose otolith rings formed before 17 March) disappeared from the NTDDs during and after April, and the NTDDs of LJs were heavily biased toward a later period than those of the larvae. In 2003, Oyashio Coastal Water (< 3 ℃ and 33.0 salinity) unexpectedly intruded into the bay in late March and lowered the water temperature from 6.3 ℃ on 6 March to 4.1 ℃ on 25 March. One possible cause of mortality in the early cohort of 2003 might be feeding failure caused by the extremely low water temperature.
Rights: The original publication is available at
Type: article (author version)
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: 高津 哲也

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