Effects of Sargassum ilicifolium (Sargassaceae, Phaeophyceae) Meal on Physico- Chemical Formulated Shrimp (Litopenaeus vannamei) Feed
Almost 309 species and infraspecific taxa of macroalgae including 78 Chlorophyta (within 15 families), 70 Ochrophyta (Phaeophyceae; within 7 families) are and 161 Rhodophyta (within 30 families) listed in coastal line of the Persian Gulf and iranian water of Oman Sea. Among them, Sargassum ilicifolium, a dominant brown seaweed, which was used as a part of aquatic animal feed in order to investigate its effect on physico chemical formulated feed. Two isocaloric diets (336 kcal metabolizable energy /100g diet) containing 33% crude protein, with and without inclusion of brown seaweed S. ilicifilium (0 and 15, replaced on protein resources of shrimp diet) were used. Seaweed supplement in formulated feed not only improved the humidity absorbance (110.20%±5.00%) and stability of pellet feed in seawater (98.11±3.23%) compared to the control but also acted as the best binder and increased the periods of leaching pellet (5.20±0.50) when they were dropped in seawater. It can be replaced instead of vitamin and mineral premixes when the feed is enriched by vitamin pyridoxine (6.4 mg.100-1 seaweed DW) and minerals cobalt (0.06 mg.100-1 seaweed DW) and zinc (1.1 mg.100-1 seaweed DW).
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