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Age and growth of the hexagrammid fish Hexagrammos agrammus from Aburatsubo were estimated from otoliths of 278 fish. A translucent zone was formed annually, and its formation was completed at a period between January and February, which is the end of the spawning season for this species at Aburatsubo. The oldest male was estimated to be 5 years old and the oldest female was 7 years old. The von Bertalanffy growth equations were as follows: males, Lt=168.8[1-exp{-0.48(t+1.05)}] and females, Lt=178.0[1-exp{-0.49(t+1.04)}], where t is age in years and Lt is standard length in mm at age t. A mark-recapture experiment and analysis of monthly mean length of each year class showed that the growth of H. agrammus is rapid in spring, generally between February and May, and slow in the remaining seasons.

Age and Growth of the Hexagrammid Fish Hexagrammos agrammus at Aburatsubo, Japan.