鹿児島港産ヒメ目ハダカエソ科ハダカエソの成熟と産卵回数

概要

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The maturation and spawning frequency of a paralepidid fish Lestrolepis japonica were studied in 270 specimens collected in Kagoshima Bay, southern Japan, from April to December 2002 (excluding November). Monthly changes in frequency of mature ovaries and gonadosomatic indices indicated that spawning started in May, peaked in July to September, and was completed in December. From the appearance of age 0-day postovulatory follicles (POF0) and age determination, spawning months lasted from July to October in age 0→1 fish (arrow indicates the addition of age in September), June to October in age 1→2 fish, May to October in age 2→3 fish, and May to August (the month of life span) in age 3 fish. Spawning frequencies were estimated from the fraction of POF0. The age 0→1 fish spawned 49 times, age 1→2 fish 62, age 2→3 fish 73, and age 3 fish 51, totaling 234 times in life. Reliable batch fecundity could not be obtained because of the scarcity of specimens with hydrated oocytes.
鹿児島大学の論文
2004-02-27