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¹ ICAR- Central Institute of Fisheries Education, Mumbai- 400 061, India
² ICAR- Central Institute of Fisheries Education- Rohtak Centre, Lahli, Rohtak-124 411, India DOI : 10.4194/1303-2712-v18_10_10 Viewed : 4855 - Downloaded : 6825 A 60 day trial was conducted to evaluate the effect of dietary supplementation of graded levels of potassium (K⁺) and magnesium (Mg²⁺) on Litopenaeus vannamei reared using IGSW (inland ground saline water, 10 ppt). Two different types of waters, IGSW without ionic fortification (R-IGSW, R-raw) and IGSW fortified with K⁺ & Mg2⁺ (F-IGSW, F-fortified) with equivalent salinity sea water was used. Four experimental diets with graded levels of K+ & Mg²⁺: F1 (5 g KCl & 150 mg MgCl2 kg^-1 of feed); F2 (10 g KCl & 300 mg MgCl2 kg^-1 of feed); F3 (15 g KCl & 450 mg MgCl2 kg^-1 of feed) and F4 (with no ionic amendment) were tested in the trial, for each of the two types of water. A significant improvement in the growth and survival has been observed in the groups fortified with K⁺ & Mg²⁺ in the feed (P<0.05) irrespective of the potassium and magnesium levels in the water. No significant difference in osmoregulatory capacity, serum and water osmolality and Na⁺ K⁺- ATPase activity of gill despite the significant variation (P<0.05) in serum K⁺, Na⁺, Mg²⁺ and Ca²⁺ levels were observed among different treatments. It is concluded that growth and survival of L. vannamei can be enhanced by supplementing the deficient ions such as K⁺ (5 g kg^-1) and Mg²⁺(150 mg Kg^-1) through diet as well as in the water simultaneously. Keywords : Litopenaeus vannamei, inland ground saline water, potassium, magnesium; shrimp