台湾海峡西部海区带鱼年龄和生长

ON AGE AND GROWTH OF HAIRTAIL,TRICHIURUS HAUMELA(FORSKAL) IN WESTERN TAIWAN STRAIT

据1962-1964年台湾海峡西部海区带鱼种群样本,采用椎体鉴定年龄,并对年龄结构变化与资源相关性作了分析和讨论,为资源保护和渔业管理提供依据。

Altogether 3319 samples of young and adult hairtail Trichiurus haumela(Forskal),studied in the present paper were collected from the western Taiwan Strait,during the pericd from December 1962 to May 1964.The centra were taken from first to fourth abdominal vertebra and used to determine the age and growth of this species.According to measurement results on the rates of marginal increment of the centrum,it is shown that the time of new annulus formation is from February to April,ma(?)n(?)t Ma(?)h,and the(?)g forms(?)each year.First maturing hairtail fish is at 2 years old and the length of minimum female is at 212mm,and the male 213mm.The length-weight relationship formula was calculated to be W=9.253×10-6L3.053,the relationship between the body length L(mm)and the centrum radius R(mm)was expressed to be R=9.636×10-3L-0.2158.Based on the von Bertalanffy′s growth equation,the growth parameter are computed to be I∞=477mm,W∞=1228g,t0=-0.634,and the growth inflexion point t?=2.89.The growth of lergth and weight of haritail is very rapid before 3 years old,and growth speed turns slow after 3 years otd.the maximum life span of the fish caught in this area is nine years,466mm in body length and 1270 grams innet body weight.