耳石の微細構造によるハタハタ稚魚の成長履歴の推定〔英文〕

概要

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Early growth of the hatchery-reared Japanese sandfish Arctoscopus japonicus was deduced by analyzing the otolith microstructure. A positive linear relationship was observed between the radius of lapillus and the total length in the 19 juveniles, 34.2mm in TL and 92d in age, suggesting that the otolith growth could repre-sent the body growth of fish in length. The relationship between the age and the radius of each corresponding daily increment in the lapilli revealed that otolith radius increased rapidly at the mean rate of 3.9μm/d between 31d and 52d, and thus early growth pattern devided into three phases (Ph-1; 0-30d, Ph-2; 31-52d, Ph-3; 53-92d). The rapid growing phase, Ph-2, seemed to have some relation with an abrupt increase in rearing temperature from 10 to 14°C. The otolith growth rate of a phase was positively correlated to an increment radius at the end of the phase. Furthermore, total length had a positive correlation with otolith growth rate of the latest phase, Ph-3, showing that body size might be determined by the latest growth rate of the individual.
日本水産學會の論文