Ovarian Maturation and Ovulation of the Amphidromous Type Ayu Plecoglossus altivelis in Chikugo River Based on Histological Observations

Michiya Matsuyama, Shuhei Matsuura

Research output: Contribution to journalArticle

8 Citations (Scopus)

Abstract

The process of oocyte maturation and the seasonal changes of ovarian development were observed with the amphidromous type Ayu captured at Chikugo River, Fukuoka Prefecture, Japan. In the oocytes of the fish, three kinds of the vitelline elements, i.e. yolk vesicles, yolk globules and oil droplets appeared in this order. In the mature eggs, yolk globules never formed a massed yolk in spite of increasing in size. Accumulation of yolk rapidly proceeded and was completed in about three weeks. The oocytes showed the development of asynchronous type and the mature ovaries contained groups of oocytes in various maturation stages at the same time. Therefore the ovarian maturity of the fish is adequately represented by the histological maturation stage of the oocytes that have the modal value of diameter in the first batch (the most advanced group of oocytes). After the first batch was ovulated, the second batch developed up to secondary yolk globule stage at most. But the fish seemed to die before long without ovulation of the second batch.

Original languageEnglish
Pages (from-to)1573-1580
Number of pages8
JournalNippon Suisan Gakkaishi (Japanese Edition)
Volume48
Issue number11
DOIs
Publication statusPublished - Jan 1 1982

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Plecoglossus altivelis
ovulation
maturation
oocytes
rivers
fish
river
vesicle
droplet
egg
ovarian development
oil
egg yolk
droplets
Japan
oils

All Science Journal Classification (ASJC) codes

  • Aquatic Science

Cite this

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title = "Ovarian Maturation and Ovulation of the Amphidromous Type Ayu Plecoglossus altivelis in Chikugo River Based on Histological Observations",
abstract = "The process of oocyte maturation and the seasonal changes of ovarian development were observed with the amphidromous type Ayu captured at Chikugo River, Fukuoka Prefecture, Japan. In the oocytes of the fish, three kinds of the vitelline elements, i.e. yolk vesicles, yolk globules and oil droplets appeared in this order. In the mature eggs, yolk globules never formed a massed yolk in spite of increasing in size. Accumulation of yolk rapidly proceeded and was completed in about three weeks. The oocytes showed the development of asynchronous type and the mature ovaries contained groups of oocytes in various maturation stages at the same time. Therefore the ovarian maturity of the fish is adequately represented by the histological maturation stage of the oocytes that have the modal value of diameter in the first batch (the most advanced group of oocytes). After the first batch was ovulated, the second batch developed up to secondary yolk globule stage at most. But the fish seemed to die before long without ovulation of the second batch.",
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N2 - The process of oocyte maturation and the seasonal changes of ovarian development were observed with the amphidromous type Ayu captured at Chikugo River, Fukuoka Prefecture, Japan. In the oocytes of the fish, three kinds of the vitelline elements, i.e. yolk vesicles, yolk globules and oil droplets appeared in this order. In the mature eggs, yolk globules never formed a massed yolk in spite of increasing in size. Accumulation of yolk rapidly proceeded and was completed in about three weeks. The oocytes showed the development of asynchronous type and the mature ovaries contained groups of oocytes in various maturation stages at the same time. Therefore the ovarian maturity of the fish is adequately represented by the histological maturation stage of the oocytes that have the modal value of diameter in the first batch (the most advanced group of oocytes). After the first batch was ovulated, the second batch developed up to secondary yolk globule stage at most. But the fish seemed to die before long without ovulation of the second batch.

AB - The process of oocyte maturation and the seasonal changes of ovarian development were observed with the amphidromous type Ayu captured at Chikugo River, Fukuoka Prefecture, Japan. In the oocytes of the fish, three kinds of the vitelline elements, i.e. yolk vesicles, yolk globules and oil droplets appeared in this order. In the mature eggs, yolk globules never formed a massed yolk in spite of increasing in size. Accumulation of yolk rapidly proceeded and was completed in about three weeks. The oocytes showed the development of asynchronous type and the mature ovaries contained groups of oocytes in various maturation stages at the same time. Therefore the ovarian maturity of the fish is adequately represented by the histological maturation stage of the oocytes that have the modal value of diameter in the first batch (the most advanced group of oocytes). After the first batch was ovulated, the second batch developed up to secondary yolk globule stage at most. But the fish seemed to die before long without ovulation of the second batch.

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