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The present paper is a report on the age-composition, growth and growth-index of mullet. All specimens (Total 1399) were collected from Bohai Sea, during the years 1960-1961,1962-1963,1978-1979. Fishes measured on the average (one-year old)127.94-165.34mm; (two-year old)212.71-276.25mm;(three-year old)298.54-368.85mm;(four-year old) 381.61-467.2mm and (seven-year old) 633.5-663mm.The growth of the female fish is more quick than the male. Formation of annulus in the scale occurs in the middle of april to June. The growth of mullet can be divided into three stages as following: the first stage (one to two years) is the prematurity stake, the average of it growth-index is 47.3.The Second stage (three to five years) is a quick-growth syage,the average growth-index is 82.39.The third stage (six years and afterwards),is the degeneration stage, the average growth-index is 42.76.
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