Influence of various pH regimes on hatching success and hatching time of Clarias gariepinus (Butchell 1822) eggs
Journal Title: Journal of Research in Biology - Year 2011, Vol 1, Issue 7
Abstract
A laboratory experiment was conducted to assess the Hatching success and Hatching time of Clarias gariepinus eggs as influenced by various pH treatments. Experimental solution comprising various pH ranges (2-12) was constituted using HCl and CaOH solutions as the case may be. Forty Clarias gariepinus eggs were distributed in each 3.5liter plastic basin containing different pH regimes and were allowed to stand for 24 hours incubation. Results showed that extreme pH of 2-3 and 10-12 were 100% lethal to Clarias gariepinus eggs. The median lethal hatching pH (ML50HpH) were found to be 4.45 and 9.40 for acidic and alkaline treatment respectively while the optimal hatching pH is 6.0 with hatchability of 75%. However pH of 4, 5 and 10 caused a prolongation in embryogenesis, which resulted in delayed hatching time when compared with other pH treatments. There was significant (p<0.05) effect of various pH regimes on hatching success and hatching time of Clarias gariepinus eggs
Authors and Affiliations
Uzoka CN, Mgbeahuruike LO, Nwodu JA
Keywords
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