Prevalence of encysted metacercariosis among oreochromis niloticus in Dakahlia province with special reference to treatment

2004 ◽  
Vol 6 (2) ◽  
pp. 109-125
Keyword(s):  
Special Reference ◽  
Oreochromis Niloticus

Genetic improvement of Nile tilapia (Oreochromis niloticus) with special reference to the work conducted by the WorldFish Center with the GIFT strain

2011 ◽  
Vol 3 (1) ◽  
pp. 27-41 ◽  
Author(s):  
Raul W. Ponzoni ◽  
Nguyen Hong Nguyen ◽  
Hooi Ling Khaw ◽  
Azhar Hamzah ◽  
Khairul Rizal Abu Bakar ◽  
...  
Keyword(s):  
Special Reference ◽  
Oreochromis Niloticus ◽  
Genetic Improvement ◽  
Nile Tilapia ◽  
Nile Tilapia Oreochromis Niloticus ◽  
The Gift

Ultrastructure of Testicular Spermatozoon of the Fish Oreochromis Niloticus

1988 ◽  
Vol 46 ◽  
pp. 278-279
Author(s):  
T. Guha ◽  
A. Q. Siddiqui ◽  
P. F. Prentis
Keyword(s):  
Electron Microscope ◽  
Oreochromis Niloticus ◽  
Osmium Tetroxide ◽  
Sperm Cells ◽  
Adult Fish ◽  
Testicular Sperm ◽  
Thin Sections ◽  
Important Fish ◽  
Testicular Spermatozoon ◽  
Diamond Knife

Tilapia, Oreochromis niloticus, is an economically important fish in Saudi Arabia. Elucidation of reproductive biology of this species is necessary for successful breeding program. In this paper we describe fine structure of testicular sperm cells in O, niloticus.Testes from young adult fish were fixed in gluteraldehyde (2%) and osmium tetroxide (1%), both in cacodyl ate buffer. Specimens were processed in the conventional way for electron microscopy and thin sections of tissues (obtained by cutting the blocks with a diamond knife) were stained by ura- nyl acetate and lead citrate. These were examined in a Carl Zeiss electron microscope operated at 40 kV to 60 kV. Sperm cells were obtained from testes by squeezing them in cacodyl ate buffer. They were fixed in gluteraldehyde (2%) in the same buffer, air dried, gold coated and then examined in a Philips scanning electron microscope (SEM) operated at 25kV.The spermatozoon of O. niloticus is consisting of head, midpiece and tail (Fig. 1).

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