Pellet feed improvements through vitamin c supplementation for snakehead, channa striata (Bloch 1793), culture
Date of Original Version
Vitamin C, or ascorbic acid (AA), is important in growth and physiological functions of fish. Six soybean meal-based (SBM) diets containing 0, 125, 250, 500, 1000 and 2000 mg.kg-1 of AA were fed to snakehead, Channa striata (Bloch 1793) (initial weight 6.63 + 0.16 g) for 8 weeks in the laboratory. Survival of snakehead in the 250 and 500 mg.kg-1 treatments was significantly higher (P < 0.05) than the control, but not in the other treatments. Final weight and specific growth rate (SGR) of fish in all the AA-supplemented diet treatments were significantly higher (P < 0.05) than the control. Feed intake (FI), feed conversion ratio (FCR), and protein efficiency ratio (PER) also differed significantly, but not in a clearly dose-dependent manner. The requirement of AA for snakehead was calculated to be 277 mg.kg-1. No vertebral anomalies were observed. Erythrocyte count was significantly (P < 0.05) higher at 1000 and 2000 mg.kg-1 than at 0 and 125 mg.kg-1. Fish in 250 mg.kg-1 had significantly (P < 0.05) higher leukocyte count than those in 0, 1000, and 2000 mg.kg-1. A bacterial challenge test with Aeromonas hydrophila revealed that 500 and 1000 mg.kg-1 had the lowest cumulative mortality. In an on-farm trial, SBM-based and commercial diets augmented with 0, 500, 750, or 1000 mg.kg-1 AA were fed to C. striata for 23 weeks. All AA-supplemented SBM-based diets provided significantly (P < 0.05) higher final weights and overall yield than did all the AA-supplemented commercial diets. Maximum survival (85.3 %), final fish weight (573.5 g), yield (293.3 kg.hapa-1) and profit (0.38 USD.kg fish-1), as well as minimum FCR (1.16), production cost (1.12 USD.kg fish-1) and feed cost (0.98 USD.kg fish-1) were obtained with the 500 mg.kg-1 SBM diet.
Publication Title, e.g., Journal
Asian Fisheries Science
Hien, Tran T., Pham M. Duc, Nguyen T. Khanh, Nguyen van Khanh, Tran T. Hoa, Tran M. Phu, and David Bengtson. "Pellet feed improvements through vitamin c supplementation for snakehead, channa striata (Bloch 1793), culture." Asian Fisheries Science 31, 3 (2018). doi: 10.33997/j.afs.2018.31.3.002.