Eggs Immersion with Vitamin C on Hatching Rate, Growth and Mortality of Giant Gourami Larvae

Abstract

<b>Background and Objective:</b> The giant gourami (<i>Osphronemus goramy</i>; Lacepede, 1801) is one of Indonesia's main freshwater fish of economic benefit for food security. This study evaluated the effects of vitamin C dosages used for immersion embryonic and larval of giant gourami. <b>Materials and Methods:</b> The vitamin C using Ascorbic acid standard (FLUKA, Sigma-Aldrich), each weighed 50, 100, 150 and 200 mg and dissolved in 1 L of fresh borehole water is referred to as P<sub>2</sub>, P<sub>3</sub>, P<sub>4</sub> and P<sub>5</sub>. At the same time, 1 L of fresh borehole water not added with vitamin C is called P<sub>1</sub> (Placebo). Each treatment was formulated with 5 L and poured into an incubator tank with a capacity of 10 L Then, as many as 150 eggs are incubating per experiment in each incubator tank. These larvae of each experiment were rearing for 20 days using live feed (tubifex) 40% per feed. Each treatment was three replicates. <b>Results:</b> In this study, larval hatching rates varied from 78.59-98.22%, with the survival of endogenous feeding periods ranging between 93.08 and 99.10%. The specific growth rate increased from 11.14 and 13.38% per day. The Coefficient of thermal growth increased from 1.49-1.70. Larval mortality after exogenous feeding for 20 days of the experiment decreased from 21.11-5.56%. The Coefficient of variation in weight was between 3.19 and 14.04%. <b>Conclusion:</b> Giant gourami eggs and larvae hatched and survived and grew well in immersion with a dose of vitamin C up to 200 mg L<sup>1</sup>.