The materials were collected in January to June, September to November, 1975; inDecember, 1977; and also in January to August, 1978. Altogether 1,400 samples werecollected by trawling and ranged 26°30'N～34°N and west of 125°30'E. The results are as follows: 1. The relationship between body length and centrum radius is shown by the followinglinear correlation: L = 7.046R + 49.590 r= 0. 938 (FM) L = 7.241R + 46.016 r=0.949 (F) L = 6.555R + 60. 666 R= 0. 906 (M)Where L = body lengh R = centrun radius r = relative coefficient 2. The centrum of the atlas was taken as a material for examining and measuring theannual ring. The annual ring was found between the opague zons and translucent zoneunder transmitted light. The characteristics may be divided into three types. (1) Mono-belt type. (2) Bi--belt type. (3) Poly-belt type. 3. According to the year round measurement of the marginal increment of the cen-trum, it proves that the ring forms once a year. The time of formation is from Decemberto June, mainly between April and June. 4. The average body length and body weight of filefish in each age group are asfollows: Ⅰ age: 119. 5 mm and 44. 5 g, Ⅱ age: 159. 9 mm and 70. 9 g, Ⅲ age: 194. 8 mm and 136. 9g, Ⅳ age: 215. 2 mm and 190. 8g, Ⅴ age. 229. 2 mm and 231. 3 g, Ⅵ age: 245. 9 mm and 283. 5g, Ⅶ age: 266. 3 mm and 390. 0g, Ⅷ age: 280.0 mm and 447.5g,Ⅸ age: 290.0 mm and 547. 5g, respectively.The length of first maturing female is at 158. 2 mm, and the male 162. 6 mm. 5. The length-weight relationship may be predicated by the equation of exponentialtunction. L = 41. 324W 0: 315Where L = body Length W = body Weight 6. Through the observations and analyses of the samples, the maximum life span ofthe species is ebout ten years, the age composition is comparatively simple, age groupe Ⅲand IY predominate in the population, and individuals older then six years occur only in alimited quantity.