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Dietary tryptophan requirement of fingerling Indian major carp, Cirrhinus mrigala (Hamilton)

2005; Wiley; Volume: 36; Issue: 7 Linguagem: Inglês

10.1111/j.1365-2109.2005.01275.x

1365-2109

Imtiaz Ahmed, Mukhtar A. Khan,

Reproductive biology and impacts on aquatic species

Aquaculture ResearchVolume 36, Issue 7 p. 687-695 Dietary tryptophan requirement of fingerling Indian major carp, Cirrhinus mrigala (Hamilton) Imtiaz Ahmed, Imtiaz Ahmed Fish Nutrition Research Laboratory, Department of Zoology, Aligarh Muslim University, Aligarh, IndiaSearch for more papers by this authorMukhtar A Khan, Mukhtar A Khan Fish Nutrition Research Laboratory, Department of Zoology, Aligarh Muslim University, Aligarh, IndiaSearch for more papers by this author Imtiaz Ahmed, Imtiaz Ahmed Fish Nutrition Research Laboratory, Department of Zoology, Aligarh Muslim University, Aligarh, IndiaSearch for more papers by this authorMukhtar A Khan, Mukhtar A Khan Fish Nutrition Research Laboratory, Department of Zoology, Aligarh Muslim University, Aligarh, IndiaSearch for more papers by this author First published: 11 April 2005 https://doi.org/10.1111/j.1365-2109.2005.01275.xCitations: 22 Correspondence: M A Khan, Fish Nutrition Research Laboratory, Department of Zoology, Aligarh Muslim University, Aligarh 202 002, India. E-mail: khanmukhtar@yahoo.com Read the full textAboutPDF ToolsRequest permissionExport citationAdd to favoritesTrack citation ShareShare Give accessShare full text accessShare full-text accessPlease review our Terms and Conditions of Use and check box below to share full-text version of article.I have read and accept the Wiley Online Library Terms and Conditions of UseShareable LinkUse the link below to share a full-text version of this article with your friends and colleagues. Learn more.Copy URL Share a linkShare onFacebookTwitterLinked InRedditWechat Abstract An 8-week feeding trial was conducted to evaluate the effects of dietary tryptophan concentration on weight gain and feed efficiencies of fingerling Indian major carp, Cirrhinus mrigala. Six isonitrogenous (40% crude protein) and isocaloric (17.90 kJ g−1) amino acid test diets containing casein, gelatin and l-crystalline amino acids with graded levels of l-tryptophan (0.06, 0.16, 0.26, 0.36, 0.46 and 0.56 g 100 g−1 dry diet) were formulated. Fish (4.25±0.30 cm, 0.62±0.02 g) were randomly stocked in triplicate groups in 70 L (water volume 55 L) flow-through (1–1.5 L min−1) indoor circular tanks and fed experimental diets at 5% of their body weight/day in two feedings at 08:00 and 16:00 hours. Maximum live weight gain (277%), lowest feed conversion ratio (FCR) (1.50) and highest protein efficiency ratio (PER) (1.66) were measured at 0.36% dietary tryptophan. The relationship between dietary tryptophan levels and weight gain, FCR and PER data were described using second-degree polynomial regression analysis indicating the tryptophan requirement at 0.42, 0.39 and 0.38 g 100 g−1 of dry diet respectively. Whole body moisture decreased with increasing tryptophan up to 0.36%. Significantly (P<0.05) higher protein content was evident in fish fed diet containing 0.36% tryptophan. Body fat increased significantly (P<0.05) in fish fed with different tryptophan concentrations except those fed 0.36% tryptophan where a significantly lower fat content was noted. Significantly (P<0.05) higher ash content was reported at 0.06% and 0.16% tryptophan levels. Survival was 100% in fish fed all the diets except those fed 0.06% tryptophan. Based on the results, diets for fingerling C. mrigala should contain tryptophan at 0.38 g 100 g−1 dry diet, corresponding to 0.95 g 100 g−1 dietary protein for optimum growth and efficient feed utilization. Citing Literature Volume36, Issue7May 2005Pages 687-695 RelatedInformation