Abstract
The present study aimed to determine the effect of different levels of protein on the growth, body composition, amino acid profile and serology of Channa marulius fingerlings. The experiment was conducted in ten happas installed in earthen ponds, each stocked with 10 fishes for 90 days. Four commercial fish feeds having 25%, 30%, 32% and 40% crude protein (CP) levels were fed to fish at 3% of their wet body weight three times a day. The results of the study revealed that highest weight gain, feed conversion ratio and survival rate were observed in 30% protein feed. Meanwhile, moisture content was higher in fish fed with 30% CP feed while highest crude protein was recorded in 40% CP fed fish. Lowest fat content was observed in 32% CP feed. Amino acid profile of fish revealed better results in 30% CP feed. Total protein, glucose and globulin were also highest in fish feeding 30% CP feed, while albumin was highest in 40% CP feed. It is concluded that 30% CP feed showed better results in terms of growth, amino acid profile and serological parameters without effecting fish body composition.
Highlights
Aquaculture production has been increased since last three decades to meet the protein demand across the globe (Cruz-Cervantes et al, 2018)
For proper growth of fish best level of protein is an important factor for feed formulation. To maintain their several life process fish require energy which it obtain from feed in the form of protein (Okorie et al, 2007) Protein deficient feed results in poor growth, by converting nitrogenous wastes into energy through oxidation of amino acids (Wu and Gatlin III, 2014)
The growth parameters were observed maximum in diet containing 30% crude protein (CP), while minimum growth was observed in the diet containing 25% CP
Summary
Aquaculture production has been increased since last three decades to meet the protein demand across the globe (Cruz-Cervantes et al, 2018). The percentage of quality protein in feed results in effective growth in carnivorous fish species (Lee et al, 2002). For proper growth of fish best level of protein is an important factor for feed formulation. To maintain their several life process fish require energy which it obtain from feed in the form of protein (Okorie et al, 2007) Protein deficient feed results in poor growth, by converting nitrogenous wastes into energy through oxidation of amino acids (Wu and Gatlin III, 2014)
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