International Journal of Fauna and Biological Studies

Volume 1, Issue 4

Significance of light intensity to enhance the colour of marine ornamental fish Amphiprion clarkii (Bennett, 1830) in captivity

Author(s): M Uthayasiva *, MA Badhul Haq and TT Ajith Kumar

Abstract: In this present study imperative to develop a method for maintaining healthy and attractive colourful fishes within short duration by provide high light intensity to clown fish Amphiprion clarkia. the single batch of juveniles (n=100) were selected with an average length of 2.0±0.2 mm and average weight of 0.31± 0.02 g with sea anemone Stichodactyla haddoni (n=2). Optimum water quality parameters were maintained as Temperature-27±2 0C, Salinity-28±1 ppt, NH4-0.001 ppm, Dissolved oxygen- >6.0±1 ppm, pH-7.7±0.2 photoperiod (12L: 12D) and water depth-1.5±0.2 m. 1000 L FRP tank and rectangular aquaria filled with 500 L water of estuarine water in a recirculating system treated with a biofilter and mechanical filter. A screen mesh was used on the outlet pipe in the aquarium to prevent fish escaping. Light intensity was maintained as 2700-3500 lux by Three white colour tube light was fixed on top of the tank with photoperiod of 13L:11D. Experimental fish of A. clarkii 50 numbers were placed in each tank. The result of these experiments shows Feeding motivation and it was based on the latency to begin feeding, which was defined as the time taken to start swimming towards food or to the first of food. From the current study, it was found that fast feeding (first snatch pellets occurring in 10 seconds or less) was more frequent in fish in colour lights. The experiment II demonstrated that after 10-15 days the lighting tank fishes colour was changed gradually from light brown with white bars to dark black with milky white bars and weight also, which indicates the light is responsible for growth and colour but in case of experiment I normal colour was occurred and the growth was slowly improved. Within 55-60 days after the juveniles got marketable size of 3.5±0.2 cm in experiment II but in experiment I it took around 90-95 days. Result of the experiment I showed variations in the growth and weight and morphologically miss bends was observed due to nutrients deficiency, but in the case of experiment II showed more colour, growth and no much variations in the growth patterns. The present study showed that ambient light intensity could change colour traits not only on the major body but also on fins. Growth functions obtained from light indicates (weight gain, specific growth rate and daily growth rate) of clown fish have better performances in white light compared to open water culture. In this context main theme of this paper was improving the colour patterns of A. clarkii to upsurge the marketable value by light intensity for crop a different colour verities as black, orange and brown.

Fig: A. Fishes from FRP tanks showed uneven size. B. Identical size, Gorgeous colour was observed in lighting tank. C. Miss-bands and abnormal size fishes in FRP tanks. D. Normal growth and light colour from FRP tank.

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