한국양식학회지 (Journal of Aquaculture)

한국양식학회 (The Korean Society of Fisheries and Aquatic Science)
권호 표지

Seasonal Changes in the Ovary of the African Lungfish Protopierus annectens (Pices : Sarcopterygii) in the Flood Plains of River Niger in Etsako East Local Government Area of Nigeria

  • Onyedineke, Nkechi E. (Department of Zoology, Ambrose Alli University) ;
  • Otuogbai, Timothy (Department of Zoology, Ambrose Alli University) ;
  • Elakhame, Luckey A. (Department of Zoology, Ambrose Alli University) ;
  • Erekaife, Joyce O. (Department of Zoology, Ambrose Alli University)
  • 발행 : 2002.02.01
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초록

We investigated the gonadosomatic index (GSI), germ cell development, reproductive cycle of the Afriean lungfish Protorierus annecteus (Owen) by histological observations and morphometric data. Samples were collected from the river Orie and its flood of Nigeria, from January to December 2000. The fish is dioecious and oviparous. Monthly changes in the gonadosomatic index (GSI) showed a similar pattern to change in the mean oocyte diameter and the reproductive cycle. The reproductive period occurred from March to July-August; the spawning period was once a year between truly and August, and the main spawning occurred in August when active and voracious feeding occurred during the rainy season. In the resting (dormant) stage after spawning, fish stopped feeding and aestivated during the dry season from December to February. The reproductive cycle of the species can be divided into five successive stages, quiescent stage (March to April), developing/maturing stage (April to lune), ripe/spawning stage (July to August), post-spawning stage (September to November), and resting (dormant) stage (December to February).

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