Abstract
An investigation on the captive rearing of different 11 hill stream ornamental fishes has been conducted in aquarium during October, 2015 to May, 2016. Fishes were provided with artificial food and small fine floating pellets for 2 or 3 times daily. The average weight and length of each species were recorded monthly. The highest mean weight gain (1.9%) was found in Devario aequipinnatus and lowest mean weight gain (-0.47%) was observed in Olyra praestigiosa. Similarly, the maximum percentage growth rate (0.137) was recorded in D. aequipinatus and minimum (-0.097) was in O. praestigiosa. It reveals that O. praestigiosa was not suitable in the aquarium condition. Further, it also found that all the experimented fish species can be considered as ornamental fishes as they can acclimatize in the aquarium condition except O. praestigiosa. The survivality rate for all species was found to be 100% except O. praestigiosa. The Student’s test (t) reveals that the initial and final weight was found to be significant at the 0.05 level in Garra sp. (t=-6.545); M. dibrugarensis (t=-8.211); L. guntea (t=-19); A. apangi (t=-7.053) and O. praestigiosa (t=-3.659). In case of the length, the initial and final was also significant in D. aequipinatus (t=-7.535); Garra sp. (t=-4.276); P. ticto (t=-3.449); M. dibrugarensis (t=-13.408); B. bendelisis (t=-4.392) and A. apangi (t=-10.292). The lowest water temperature (14oC) was recorded in December and highest (27°C) in May; pH varied between 6.8 (April) and 7.6 (January). Dissolved oxygen (DO) was found within 6.55 ppm (medium size aquarium) to 7.91 ppm (cemented tank). Free carbon dioxide (FCO2) concentration (1.0 ppm) was almost same trend in both cemented tank and aquaria. Total alkalinity ranged from 65 to 76 and the maximum was observed in large aquarium and the minimum in stocking tank. The recorded values of water quality were found within the permissible limit.
Highlights
Ornamental fish, known as aquarium fish and they are the live jewels and the most attractive living organisms of the aquatic world
Throughout the world, ornamental fish keeping is very popular as interior decorative materials; an easy and stress relieving hobby
As fish farming intensifies and artificial propagation of the ornamental fish, so rearing feasibility is top priority as well as providing feed that are nutritionally balanced for the utmost growth in the aquarium
Summary
Ornamental fish, known as aquarium fish and they are the live jewels and the most attractive living organisms of the aquatic world. Their lively and fascinating activities are worth enjoying as colourful fish has high aesthetic value. The demand for fish has been increasing due to the increase in population and aquarium fish trade and their values towards health benefits of human being. As fish farming intensifies and artificial propagation of the ornamental fish, so rearing feasibility is top priority as well as providing feed that are nutritionally balanced for the utmost growth in the aquarium
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