On the Ovarian Maturation and Spawning of the Landlocked Large Type Ayu Plecoglossus altivelis in Lake Biwa

Michiya Matsuyama, Shuhei Matsuura

研究成果: ジャーナルへの寄稿記事

11 引用 (Scopus)

抄録

Aspects of the reproductive biology of the landlocked large type ayu Plecoglossus altivelis in Lake Biwa, “ooayu”, were investigated from August to October in 1980. In more than half the number of ovaries after the first spawning, degeneration of developing eggs or collapse of the whole ovary was observed. Hence, after the first spawning, a small number of fish seemed to attain the second maturation. All the fish which attained the second maturation were skinny and half of them had lower gonadosomatic indexes and smaller number of mature eggs compared to those in the first maturation. No significant differences of egg diameter for various maturation stages of egg were indicated between the dwarf type ayu, “koayu”, and the ooayu. The pattern of oocyte development of ooayu showed the “trimodal twice spawning type”. Resting ocoytes in the peri-nucleolus stage which are usually present all the year round in the general serial spawners, were not observed in the ovary of ooayu after the second spawning. This fact suggests that ooayu have an inherent regulating mechanism of oocyte development adapted to the annual life of the fish, i.e. they discharge all oocytes in a single spawning season in spite of their serial spawning habit.

元の言語英語
ページ(範囲)691-698
ページ数8
ジャーナルNippon Suisan Gakkaishi (Japanese Edition)
51
発行部数5
DOI
出版物ステータス出版済み - 1 1 1985

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Plecoglossus altivelis
maturation
spawning
lakes
lake
egg
oocytes
fish
gonadosomatic index
cell nucleolus
plant architecture
reproductive biology
Biological Sciences

All Science Journal Classification (ASJC) codes

  • Aquatic Science

これを引用

On the Ovarian Maturation and Spawning of the Landlocked Large Type Ayu Plecoglossus altivelis in Lake Biwa. / Matsuyama, Michiya; Matsuura, Shuhei.

:: Nippon Suisan Gakkaishi (Japanese Edition), 巻 51, 番号 5, 01.01.1985, p. 691-698.

研究成果: ジャーナルへの寄稿記事

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