ISSN:
1365-2109
Quelle:
Blackwell Publishing Journal Backfiles 1879-2005
Thema:
Land- und Forstwirtschaft, Gartenbau, Fischereiwirtschaft, Hauswirtschaft
Notizen:
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 (T3) 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 T3 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 T3 administration appeared to be stage-specific. At the end of the experimental period of 180days (60days TP+120days PTP), the optimum dosage of T3 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 T3 administration in addition to its economics, only incorporation of T3 in the diet of hatchlings appeared to be economical.
Materialart:
Digitale Medien
URL:
http://dx.doi.org/10.1111/j.1365-2109.1998.tb01109.x
Permalink
