INFLUENCES OF CHOSEN WATER HARDNESS ON GONAD, EMBRYONIC DEVELOPMENT, EGG HATCHABILITY IN BETTA SPLENDENS (REGAN)
Author(s):
Y.S. Santhi Pon Indira, L.Roselin Rajathi
Keywords:
Water hardness, egg hatchability, Fecundity, Choriolysis, Yolk resorption, Development, B.splendens
Abstract
The hardness is one of the important water quality parameters which determines the survival, development and growth of fishes and it varies from species to species. Rearing of B. splendens in four different hardness media (60, 260, 600 and 1200 mg CaCO3 l-3), reproduction, egg hatchability and development were studied for 56 days Mean body length and weight as a function of time. The fecundity and egg hatchability of B.splendens reared in the low water hardness of 260mg CaCO3 elicited maximum performance. Although fish reared in 600 and 1200 mg CaCO3 groups laid 308 and 265 eggs spawn1and its hatchability was drastically declined to 27 and 1.49% .An increase in water hardness, the developmental processes were advanced upto 600mg CaCO3l-1 and thereafter defective developments such as choriolysis, failure of yolk resorption, eye developed but no further development, tail curvature etc. Occurred in B. splendens eggs incubated at 1200mg CaCO3 l-1. The present study reveals that B. splendens prefer soft water (260 mg CaCO3 l-1) for maximum growth, reproduction, egg hatchability and development.
Article Details
Unique Paper ID: 161247

Publication Volume & Issue: Volume 10, Issue 3

Page(s): 76 - 85
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