持続的高水温・短日並びにその後の条件変更がキンギョの成熟に及ぼす効果

概要

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Ovazies of both yearling and 2-3 year old goldfish remained suppressed indefinitely at 24°C/12L. The older fish were unresponsive when transferred to 24°C/16L, while some yearling females advanced to the yolk globule stage and a few spawned at 24°C/16L or 16°C/16L. Most yearling females started maturation when transferred to natural conditions on Jan. 5. The ovarian matura-tion was further accelerated when the females were exposed to 24 or 16°C combined with 12 or 16L following 2 months stay under natural conditions. On the other hand, both ages of males matured at 24°C/12L. Spermatogenesis was accelerated when transferred to 24°C/16L. However, on both regimes the males passed into post-spawning within a short period. Although spermatogenesis slowed down in fish transferred to 16°C/16L, the fish kept active testicular activity after full maturation. Spermatogenesis became even slower in the fish kept under natural conditions of winter, but it was accelerated when fish were transferred to 24 or 16°C.
公益社団法人日本水産学会の論文