Abstract
The present study was conducted to investigate effects of stocking density on growth performances of gold fish (Carassius auratus) in hapas. Experiment was conducted for a month with three treatments where three stocking densities were T1 (10 fry/hapa), T2 (15 fry/hapa) andT3 (20 fry/hapa) each having three replications which were selected randomly. In the present experiment hapa (3ft × 2ft × 2ft) with 1 mm mesh net was used. Gold fish fry having a mean body weight of 0.007 g were used in all treatments. Fishes were fed at the rate of 10% of their body weight containing 34.11% protein. Water quality parameters were monitored at 10 days interval and the ranges were –temperature 24.75 to 27.75 oC, dissolved oxygen 3.68 to 4.09 mg/L, pH 7.3 to 8.16, ammonia 0.3 to 1 mg/L, nitrite 0.01 to 0.03 mg/L, phosphate 0.6 to 1 mg/L and alkalinity 119 to 187 mg/L. At the growth performances were evaluated by comparing mean final body weight, specific growth rate and food conversion ratio. The present study showed that the gold fish fry in T1 resulted the best mean final weight gain (1.188 g) followed by T2 (0.834 g) and T3 (0.686 g). The SGR ranged between 6.64 and 7.43% per day and FCR ranged between 3.56 and 4.12 with T1 showing the lowest FCR. The survival rate (%) ranged between 76.67% to 85.67%. From the present experiment it was found that individual fish growth rate was decreased with the increase of stocking density.Asian J. Med. Biol. Res. December 2017, 3(4): 504-515
Highlights
Aquarium fish keeping is one of the most eager hobbies in the world today aquarium fish rearing and culture practice is increasing day by day
Stocking density management measures practiced in Bangladesh are not based on scientific knowledge, resulting the poor growth and survival of gold fish
It was observed that the highest weight gain of gold fish fry was obtained from anent T1 which might be due to lower stocking density and lower competition for lowest weight gain was obtained from T3 which might be due to comparatively her stocking density so the feeding competition may occur among the species
Summary
Aquarium fish keeping is one of the most eager hobbies in the world today aquarium fish rearing and culture practice is increasing day by day. Hapa system is one of the most important techniques for fry rearing of gold fish. Stocking density management measures practiced in Bangladesh are not based on scientific knowledge, resulting the poor growth and survival of gold fish. Carassius auratus is one of the most indispensable fish species of freshwater ornamental fishery. It is a kind of fish that vastly chosen by artistic minded people because of variety of colors, species diversity, attractive and, and high tolerance to.
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