西北太平洋秋刀魚Cololabis Saira（Brevoort，1856）之生殖生物學：雌魚成熟與產卵洄游

Abstract

Pacific saury, Cololabis saira, distributes widely in the waters between the subarctic and subtropical north Pacific. It is also a common fish species for human consumption. However, the migration routes and habitats of saury are not close to Taiwan and conducting biological research on the saury is not convenient and easy in Taiwan. Most biologists, teachers, and general public in Taiwan do not have good information or knowledge on the biological characteristics and habits of this common market species, especially on reproductive aspects. This paper reviewed the literature related to reproductive biology of saury to supply the domestic insufficiency in Taiwan. Also, maturation and spawning migration progress of female saury were described in detail and updated research results on saury biology over the past several years were collected and summarized in this paper. Firstly, a general biology of the saury was briefly described, including a specific structure of the filaments on the egg. Ovarian maturation and the 7 oocyte developmental stages of the saury were definitively described. Spawning migration progress of the adult saury between the Oyashio waters of the feeding grounds in the north and the Kuroshio waters of the spawning grounds in the south in relation to temperature, as well as relationships of the female saury maturity to her body length, ovarian weight and gonadosomatic index were compiled in this paper.