open access

https://hdl.handle.net/2115/35541

Esimation of the age and growth of Pacific saury Cololabis saira in the central North Pacific Ocean determined by otolith daily growth increments

日本語

1992

日本水産学会

Bulletin of the Japanese Society of Scientific Fisheries

58(9)

1607-1614

The age, growth, and hatch dates of the Pacific saury Cololabis saira in the central North Pacific Ocean were estimated by analysing the microstructure of otoliths. Saury samples were collected by drift nets of several mesh sizes from July to August 1989. Growth increments of otoliths were counted under a scanning electron microscope. The sauries were divided into an almost tri-modal size distribution: a small-sized group (x¯: 210mm in knob length, range 200-240mm), a medium-sized group (x¯: 260mm, 240-295mm), and a large-sized group (x¯: 315mm, more than 295mm). Ages in days of sauries of the large-and medium-sized groups were estimated at 560-690 days and 310-450 days, respectively. Birthdate analyses of the sauries showed that the large- and medium-sized groups were estimated to have hatched from November 1987 to January 1988 and from May to August 1988, respectively. It is estimated that the life span of the saury in the central North Pacific area is about 2 years.

学術雑誌論文

Version of Record

© 1992 The Japanese Society of Fisheries Science

0021-5392

1349-998X

AN00193422