Effects of Dietary Organic Selenium on Growth, Survival, Physiological and Hematology Conditions of Snub-Nose Dart (Trachinotus blochii Lacepide, 1801)

This study aimed to determine the effects of dietary supplementation of organic selenium (OS) on growth, survival, as well as the physiological and hematological status of snub-nose dart, Trachinotus blochii. Five diets supplemented with OS-Selplex (Selplex, Alltech, USA) at 0, 0.1, 0.2, 0.3 and 0.4 g/kg were fed to fish (2.30 ± 0.28g, average wt) for 8 weeks. Survival was significantly highest (P < 0.05) when the fish were fed the 0.3 g/kg OS-Selplex supplemented diet. Growth, flesh protein, and liver lipids, were significantly higher (P < 0.05) in fish fed all OS-Selplex supplemented diets compared to the control group. Flesh moisture content was lower (P < 0.05) in fish fed 0.2, 0.3 and 0.4 g/kg OS-Selplex supplemented diets. Hematocrit values (Ht) of the fish fed 0.3 and 0.4 g/kg OS-Selplex supplemented diets were higher than in fish fed the other diets (P < 0.05). The highest proportions of monocytes were obtained in fish fed 0.2 and 0.3 g/kg OS-Selplex supplemented diets. The results suggest that feeding 0.3 g/kg of OS-Selplex in diets increases growth performance and health status of snub-nose dart