论文部分内容阅读
本文根据1999年探捕调查资料,对北太平洋中东部海域的柔鱼生物学特性进行了研究。总的来说该海域的柔鱼属大型柔鱼,但在三个作业海区中也有区别,中部海区柔鱼的个体最大,其次为东部海区,西部海区为最小;其形体变化规律在特定的海域(175°E～ 172°W、39°～42°N)有随经度和纬度增加而增大;柔鱼随着生产月份的延续,胴长、体重有显著增大的趋势;生长速度快,经测试其胴长、体重关系式为:W_i=1.52×10~(-4)×L_i~(2.7231)。在5～7月份,柔鱼的性腺发育程度较低,绝大数处于Ⅰ期和Ⅱ期,其摄食等级也较低,以空胃和Ⅰ级胃为主,胃含物以小鱼和柔鱼占大多数。
Based on the survey data from 1999, this paper studied the biological characteristics of Ommastrephes bartrami in the central and eastern North Pacific Ocean. However, there are also differences among the three working sea areas. In the central sea area, the fish of Ommastrepheline is the largest, followed by the eastern sea area and the western sea area with the smallest size. The change rule of the body shape in a specific sea area (175 ° E ~ 172 ° W, 39 ° ~ 42 ° N) increased with the increase of latitude and longitude. With the prolongation of the production month, the length of barramundi and body weight increased significantly; the growth rate was fast, After testing the body length, body weight of the formula: W_i = 1.52 × 10 ~ (-4) × L_i ~ (2.7231). In May-July, the degree of gonadal development was lower in Ommastrephes marijuana, with the largest number in stage I and II, and its ingestion level was lower, mainly in empty stomach and grade I stomach. Fish make up the majority