Influence of selected dietary micronutrient elements on growth and biochemistry of farmed Prawns
Year: 2005
Type: dissertation
Abstract: From the present study, it is clear that all the three metals,\nselenium, molybdenum and cobalt have significant effect on the\nantioxidant status of the shrimps. Selenium and molybdenum were\nobserved to induce peroxidative damage at elevated levels. But at the\nsame level, cobalt did not show such an effect.\nSelenium was found to be growth promoting at lower levels of\ndietary supplementation. Even though low levels of dietary selenium\nhad a protective effect against the lipid peroxidation, the present study\nindicates that high levels of dietary selenium could promote lipid\nperoxidation. The selenium-dependent antioxidant enzyme, GPx\nbehaved differently in muscle and hepatopancreas. A high\nconcentration of selenium was required for the active expression of\nthe enzyme in the muscle, where as in hepatopancreas maximum\nactivity was observed at lower selenium concentration. Selenium\nsupplementation had a positive effect on GSH concentration. The\nother antioxidant enzymes such as GST, SOD and CAT showed\nenhanced activity at higher concentration of selenium.\nMolybdenum supplementation significantly reduced the free\nradical scavenger enzymes SOD and CAT. This resulted in enhanced\nlipid peroxidation in tissues. The activity of antioxidant enzyme GPx\nand the concentration of the substrate for the enzyme, GSH also were lower at elevated levels of molybdenum supplementation. In addition\nto this amino acids and fatty acids were also altered in molybdenum\nsupplemented groups. In trace amounts, dietary molybdenum exerts a\nbeneficial effect on the growth and also in the activities of the\nenzymes XO and SO. At the same time it also indicates a possibility\nof oxidative damage as a result of the peroxidation caused by the\nactivities of the enzymes SO and XO at elevated concentrations of\nmolybdenum is also indicated. The absorption of various trace\nelements was also altered by molybdenum supplementation.Among the three metals studied, cobalt was the least toxic one\nat the administered levels. But this metal has a significant effect on the\nlipid content, amino acid composition, cholesterol levels and\nphospholipid levels. Increased growth was also observed as a result of\ncobalt supplementation in shrimps. The antioxidant system of the\nanimal was activated by dietary cobalt. Tissue levels of the trace\nmetals were also found to be altered in cobalt supplemented groups of\nshrimps.These studies, thus shows that influence of dietary trace metals\ncalls for more detailed studies in farmed shrimp. They may hold the\nkey to growth and even disease resistance in shrimp. But this still\nremains as a virgin field which demands more attention, especially in\nview of the increasing importance of shrimp farming.
Authors: O. Kavitha, K. Devadasan
Language: English
Subfield: Aquatic Science
Domain: Life Sciences
SDG: Zero hunger
Open Access status: green
OpenAlex ID: W1953604614