GROWTH AND SURVIVAL OF ANGEL FISH, PTEROPHYLLUM SCALARE (SCHULTZE, 1823) FRY

GROWTH AND SURVIVAL OF ANGEL FISH, PTEROPHYLLUM SCALARE (SCHULTZE, 1823) FRY REARED AT DIFFERENT STOCKING DENSITIES

Pankaj. A. Patil *, Raju. M. Tibile, Anil. S. Pawase and Gajanan. Ghode
College of Fisheries, Shirgaon Ratnagiri, 415629, Maharashtra, India.
[*email:-pankaj090178@gmail.com]
Received: 10-01-2015 Accepted: 15-02-2015
Abstract:
The study was conducted to evaluate the effect of different stocking densities on the growth and survival of angelfish, Pterophyllum scalare fry reared in all-glass tanks without aeration and filtration system. In the experiment, angelfish fry with length and weight in the range of 1.3-1.6 cm and 0.060-0.075 g, respectively were reared at the different densities; i.e. 3 fry/l, 2 fry/l, 1 fry/l, and 0.5 fry/ l for a period of 45 days in all-glass tanks (36 l). The experiment was conducted according to completely randomized design with four replicates for each density. The fry were fed semi-purified flake feed containing 49.02% crude protein throughout the study. Daily water exchange of 10-15% was carried out for each experimental tank. At the end of the experiment, the length, weight and survival of fry were recorded. Angelfish fry reared at the density of 0.5/l exhibited the maximum average length gain (135.1060%), weight gain (945.7096%), specific growth rate (5.2162%) and survival (100%) and these parameters were found to be significantly better (p<0.05) than the fry reared at other densities. The growth of fry was observed to be decreased with increase in the stocking densities. The observations on the water quality revealed that the dissolved oxygen values decreased with increase in stocking density; whereas, the values of free carbon dioxide, ammonia-nitrogen, nitrite-nitrogen and nitrate-nitrogen increased with increase in stocking densities over a culture period. The present investigation indicated better growth and survival of angelfish fry reared at stocking density of 0.5 fry/l for 45 days in all-glass tanks without aeration and filtration system. This study revealed increase in stocking density resulted in decreased growth, survival and a significant effect on water quality parameters.

Keywords:  Pterophyllum scalare, length, weight, protein, water quality

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