Journal of Environmental Biology

Growth rate studies of marine ornamental fish Pomacentrus

caeruleus in artificial conditions

Author Details

R.G. Prashanth

Department of Zoology, Bangalore University,? Bangalore-560056, India

C.H. Debala Devi

Department of Zoology, Bangalore University, Bangalore-560056, India

D. Usha Anandhi

(Corresponding author)

Department of Zoology, Bangalore University, Bangalore-560056, India

usaanandhi@rediffmail.com

Publication Data

Paper received:

26 February 2011

Revised received:

21 July 2011

Accepted:

25 September 2011

Abstract

Aquaculture industry depends on development and testing of protocols for rearing and breeding of new aquaculture species as these techniques vary with species.? In the present study attempts have been made to study the effect of temperature and salinity on the rate of growth of the marine ornamental fish, Pomacentrus caeruleus under artificial conditions.? Results reveal the length and weight of the fish to increase gradually at an average rate of 0.10 cm and 0.23 g with decreasing salinity (25ppt to 5ppt) at 25?C and 6.54 condition factor (K).? Statistical output indicates a significant positive relationship between K at 25?C and K at 30?C (R=0.557, P<0.05).? Correlation indicated growth rate to be higher between 25?C and 30?C. This is in contrast to the hypothesis which states the weight of the fish to be different at different temperatures, F (2,54)=5.713, P<0.05.? Tukey?s test results indicate a significant difference in the weight of the fishes acclimatized at different temperatures. Mortality rate was highest in 20?C followed by 30?C while least in 25?C. The incidence of diseases was highest in 20?C and the acclimatization period highest in 30?C. In conclusion it appears that Pomacentrus caeruleus exhibits allometric growth at lower salinities and at a controlled temperature of 25?C.

Key words

Aquaculture, Pomacentrus caeruleus, ?Allometric growth, Ornamental fish???

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