The Effect of Immersion Duration in Thyroxine Hormone on Growth of Snakehead Fish Larvae (Channa striata)

Abstract

The aim of this research was to determine the best immertion duration to increase growth rate of snakehead fish larva. The research was conducted in Fish Breeding unit Batanghari Sembilan Indralaya, Kabupaten Ogan Ilir. This research used a Completely Randomized Design (CRD), with five treatments (0, 12, 24, 36, and 48 hours of immertion), with three replications. The parameters observed were growth, survival rate and water quality. The results of this research show that the highest growth rate found in the 24 hours of treatment with the average value of 0.17 g of weight and increase in length of 1.90 cm. The best survival contained in treatment of immersion for 36 hours with the average value of 71.67%.

The Effect of Immersion Duration of java barb larvae (Barbornymus gonionotus) in the combination of thyroxine hormone and recombinant growth hormone (rGH) on the egg yolk absorption and growth

“…The basis for determining the dose used in this study referred to [6] i.e. immersion of the thyroxine hormone at a dose of 0.1 mg/l affected the growth of snakehead fish larvae.…”

“…The fastest absorption rate of egg yolk of Java barb larvae was found in treatment D. The combination of thyroxine and rGH hormone solution with a long immersion time, 3 hours, was assumed to give the best effect because the amount of hormones entering the fish's body is adequate so that it increased the metabolism. According to [6], the longer the immersion time leads to the greater the amount of thyroxine hormone which enters the fish's body and will exceed the tolerance limit of the fish's body, i.e. above 36 hours, which can inhibit the fish's development.…”

“…Hyperthyroidism is a condition where the body's metabolism increases to hypermetabolic condition so that fish will usually become thin because it seems as if the fish is metabolizing its own cells resulting in abnormal conditions and causing death. According to [6] duration or time length of immersion tends to be negatively correlated with the survival rate, in which the longer the immersion leads to the lower survival rate. In accordance with [22], immersion of rGH in a too small container can cause limited space for fish to move.…”