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Relative efficacy of dietary administration of 3,5,3′‐triiodothyronine (T 3 ) to different stages of an Indian major carp, Cirrhina mrigala (Hamilton): growth and economics
Author(s) -
Ansal K Kaur M D
Publication year - 1998
Publication title -
aquaculture research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.646
H-Index - 89
eISSN - 1365-2109
pISSN - 1355-557X
DOI - 10.1111/j.1365-2109.1998.tb01109.x
Subject(s) - hatchling , biology , carp , zoology , triiodothyronine , catla , fish <actinopterygii> , fishery , hormone , hatching , endocrinology
Different stages of an Indian major carp, Cirrhina mrigala (Hamilton), i.e. hatchling, fry and fingerling, were fed diets supplemented with 3,5,3′‐triiodothyronine (T 3 ) at doses of 0, 1, 5 and 10 mg kg −1 diet for 60 days, and then reared on a hormone‐free diet for 120 days to study the growth performance of fish during the treatment period (TP) and post‐treatment period (PTP). Oral administration of T 3 at all the stages resulted in a significantly higher specific growth rate (SGR) and better food conversion ratio (FCR) in comparison to the control group ( P <0.05). However, the growth response of C. mrigala towards T 3 administration appeared to be stage‐specific. At the end of the experimental period of 180days (60days TP+120days PTP), the optimum dosage of T 3 appeared to be 5.0 mg kg −1 diet for both hatchlings and fry, and 1.0 mg kg −1 diet for fingerlings, resulting in 62.08%, 30.22% and 13.33% higher weights than in the control group, respectively. The cost of hormone for production of 1 kg of fish was lowest in the case of hatchlings (Rs 0.54), followed by fry (Rs 7.00) and fingerlings (Rs 16.07). Hence, based on the degree of growth response of the fish towards T 3 administration in addition to its economics, only incorporation of T 3 in the diet of hatchlings appeared to be economical.