SPERMATOGENESIS IN THE TESTIS OF OREOCHROMIS SPILURUS (GUNTHER) REARED IN JEDDAH FISH FARMS SAUDI ARABIAN

SPERMATOGENESIS IN THE TESTIS OF OREOCHROMIS SPILURUS
(GUNTHER) REARED IN JEDDAH FISH FARMS SAUDI ARABIAN
By
SAMIRA O. BALUBID

Girl’s college a/Education – Scientific Department -Jeddah, kingdom a/Saudi Arabian

Key word: Oreochi’Omis spilurus – Histology of Testes – Spennatogeneses
development
ABSTRACT
The spermatogenises in the testis ofOreochromis Spilunis acclimatized
and reared in Sa1Idi Arabian fish farms was investigated. Histological
studies indicated that testis maturation is accomplished in five stages as
following:
1- Immature stage having spermatogonial cells (about 12,u).
2- lvfature or recovery stage display active spermatogenesis and the cells
of all stages can be seen (spermatogonia, primary spermatocytes,
secondary spermatocytes and spermatids) .
3- 1’1< arly ripe stage characterized by the active spermiogenesis process forming spermatid and spermatozoa, beside the presence of few spermatogonia and spermatocytes. .L RIpe and spawning stage shOWing a marked dilatation ofsemineferolls lobllles containing a lot ofsperms in ripe stage. while the spawning stage as well as the ripe show a decrease in size of the lobules due to the discharge of considerable amount of spermatozoa, This stage extends through the periodfrom fo.1arch to December. 5- Spent stage, takes place in January have lobules desentebrate and no milt is found. The ultrastructure studies during spermatogenesis show that the arrangement ofmitochondria which surround the base ofnucleus, Also the condensation ofchromatin in the nuclei as well as secondary spermatocyte and spermatids are present in speCifiC pattern as maturation occurs, Also there is a great decrease in the size ofnucleus ofspermatids, The ultrastructural appearance ofspermatozoa show that they are of the prrmitive type and lack an acrosome. The nucleus IS baSically cylindrical, domed at the antenor pole andflattened at the caudal pole the ar ;Cll a fossa at tne ca 'dal f ole IS ke, hole . ape whIch contains the proxlm i il l~rd ;en.rI.:J;es. Th ~p~rm W n . • Deess oj0 SPI unlS belong to semi-cyst c type o where pertlJ rage t sis OCCl rs partly 01lt side cysts. in he lumen ·ofihe