Journal of Aquaculture (한국양식학회지)

The Korean Society of Fisheries and Aquatic Science (한국양식학회)
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Testicular Development of the Male Lungfish, Protopterus annectens (OWEN) (Pisces: Sarcopterygii) in the Flood Plains of River Niger in Udaba-Ekperi in Nigeria

  • Onyedineke, N.-E. (Department of Zoology, Ambrose Alli University) ;
  • Otuogbai, T.-O.-S. (Department of Zoology, Ambrose Alli University) ;
  • Elakhame, L.-A. (Department of Zoology, Ambrose Alli University) ;
  • Ofoni, C. (Department of Zoology, Ambrose Alli University)
  • Published : 2001.06.01
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Abstract

Testicular development of the male African lungfish, Protopterus annectens (Owen) was investigated histologically. The testis was found to be an elongated structure that possessed two distinct portions: an anterior spermatogenic part that was made up of a system of testicular tubules and a posterior vesicular part that invaded the kidney tissue. Spermatogenesis can be divided into five stages; primary spermatogonia, secondary spermatogonia, spermatocyte, spermatids and spermatozoa. Based on the gonadosomatic index (GSI) and histological changes observed, the reproductive cycle can be divided onto four distinct stages: resting and quiescent (December to February), growing (March to June) ripe and spent (July to August) and postspawning (September to November). The GSI was the maximum on July when reproductive cells were mature, ripe and ready for spawning; and the minimum in August after fish spawned.

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