Abstract
A total of forty goldfish (Carrassius auratus) with an average weight of 20 g per fish were stocked in individual glass aquaria having 50-L water holding capacity. There were 4 experimental feeding regimens A, B, C, and D having once twice, thrice and four times per day, respectively. All the groups received Nova Aquarium Fish Food @ 2% bodyweight which was equally spaced in treatment groups. The body weight, body and caudal lengths, and girth were recorded at the start of the experiment. The trial continued for 8 weeks. Group B yielded the maximum weight gain whereas group D yielded lowest weight (P<0.05). Feed Conversion Ratio (FCR) was better in Feed A and depreciated with increasing frequency (P<0.05). Caudal fin showed significant correlation with weight (+ 0.548; P<0.001) and length (- 0.792; P<0.0001). A positive correlation of dissolved oxygen (DO; P<0.001) and salinity (P<0.0001) showed with temperature. Salinity showed positive significant correlation with temperature (P<0.05). Consequently, feeding frequency twice per day is better for maximum body weight gain however better feed efficiency can be obtained at feed frequency once per day. However goldfish require genetic improvement for its rearing at commercial scale.
Highlights
Ornamental fish culture is an important primary industry [1]
Higher initial body weight was observed in fish allocated to feed B followed by feed A, C and D, respectively (P
The positive correlation of the caudal fin with weight and length leads to the fact that the measurement of caudal fin could be a good criteria to estimate the weight of the fish
Summary
Ornamental fish culture is an important primary industry [1]. Ornamental fishes are often referred as alive jewels due to their beautiful colors, their body shape and natural behavior. They are very gentle, generally tiny, charming colors and could be accommodated in confined spaces. The goldfish (Carrassius auratus) belongs to the family Cyprinidae and is the most popular variety of ornamental fish. It was one of the earliest fish to be domesticated, and is one of the most commonly kept aquarium fish [3,4]. Identification of the optimal feeding frequency helps to reduce feed wastage and maximize growth and reproduction
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