Abstract
ABSTRACTImmunomodulatory properties of fucoidan have been extensively studied in fish. However the effect of dietary fucoidan on the metabolic enzymes is not studied in detail with respect to aquatic organisms. An investigation of the effect of dietary fucoidan on the metabolic and haematological status of Labeo rohita fingerlings is presented. One hundred and eighty fingerlings were distributed into four experimental groups in triplicates. Each group was fed isonitrogenous and isoenergetic diets containing 0% fucoidan (T1), 1% fucoidan (T2), 2% fucoidan (T3) and 3% (T4) seaweed powder to satiation for a period of sixty days. Dietary fucoidan was found to significantly (P < 0.05) reduce malate dehydrogenase and aspartate aminotransferase activity in the liver tissue. Alanine aminotransferase activity in the muscle tissue of fucoidan fed groups was significantly higher than the control. The liver and gill superoxide dismutase activity was significantly reduced in the fucoidan fed groups compared to the control. The catalase activity in the liver and gill was significantly lowered in the T3 group. The blood profile of the different experimental groups also revealed beneficial effects of dietary fucoidan yielding a superior haematological status in the groups fed with fucoidan.
Highlights
Intensification of culture practices is a major contributor for the growth of global farmed fish production
We found no significant effect of dietary fucoidan on the intestinal acid phosphatase and alkaline phosphatase enzymes in fish indicating no effect on phosphorus metabolism in fish
The present study represents an attempt to investigate the effect of dietary fucoidan on the metabolic enzyme response of fish
Summary
Intensification of culture practices is a major contributor for the growth of global farmed fish production. Immunostimulants work by stimulating the innate immune system of the fish (Ringø et al 2012) and dietary polysaccharides from a variety of sources have the immunomodulatory ability (Wang et al 2016) Fucoidan is one such polysaccharide that has well known bioactive properties (Church et al 1989; Colliec et al 1991; Nishino et al 1991; Sinniger et al 1993). Haematological parameters of fish are known to be highly responsive to feed additives (Yilmaz Erguin and Celik 2012; Roohi et al 2017) In this context, we conducted the present study to determine the effect of dietary fucoidan on the antioxidant and metabolic enzymes and haematological parameters of Labeo rohita
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