Onset of individual growth difference in larviculture of Pacific bluefin tuna Thunnus orientalis using fertilized eggs obtained from one female |
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| Authors: | Takayuki Takebe Takeo Kurihara Nobuaki Suzuki Kentaro Ide Hideki Nikaido Yosuke Tanaka Satoshi Shiozawa Hitoshi Imaizumi Shukei Masuma Yoshitaka Sakakura |
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| Affiliation: | (1) Seikai National Fisheries Research Institute, Fisheries Research Agency, Taira, Nagasaki 851-2213, Japan;(2) Graduate School of Science and Technology, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan;(3) National Research Institute of Aquaculture, Fisheries Research Agency, Nakatsuhamaura, Minami-ise, Mie 516-0193, Japan;(4) Japan Sea National Fisheries Research Institute, Fisheries Research Agency, Suido-cho, Chuou-ku, Niigata 951-8121, Japan;(5) Faculty of Fisheries, Nagasaki University, Bunkyo, Nagasaki 852-8521, Japan |
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| Abstract: | We conducted a rearing experiment on Pacific bluefin tuna (PBT) larvae, which originated from one female broodstock, and determined the growth history of the larvae to clarify when the growth difference occurs. We investigated the otolith microstructure of the PBT larvae to examine the individual growth history and to predict the age and body size at the onset of individual growth difference. Since total length (TL) of fish can be back-calculated from otolith radius, we back-calculated TLs of 100 fish of 19 days post hatch (dph) divided into three size groups (small, intermediate, large). Growth difference was recognized from 3 dph (mouth opening), and the difference became larger thereafter. Growth of large-size fish was assumed to be promoted by the feeding conditions of PBT larvae. |
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