Early life history of Yoroi-mebaru, Sebastes hubbsi, in the Sado strait, Sea of Japan
1999
Nagasawa, T. (Japan Sea National Fisheries Research Inst., Niigata (Japan))
Larvae of viviparous rockfish Sebastes hubbsi are extruded as flexion larvae of about 5.5 mm SL. Notochord flexion occurs by 7 mm SL. Transformation from postflexion larvae to pelagic juveniles occurs between 10-13 mm SL. Larvae and pelagic juveniles of S. hubbsi were sampled in nearshore waters, but were not found in offshore regions such as the Chokai Bank. Planktonic larvae and pelagic juveniles mainly inhabit in the surface layers. Flexion larvae fed mainly on calanoid copepodites, with copepod nauplii as second most important by number. Postflexion and transforming larvae also fed mainly on calanoid copepodites with invertebrate eggs as second most important by number. Pelagic juveniles also fed on calanoid copepodites. I estimate that large size of larvae at parturition, rapid development and short planktonic period ensures minimum offshore dispersal in this species
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