Abstract:The fatty acid composition in muscle and hepatopancres of Litopenaeus vannamei cultured in sea water and low salinity water respectively with the same kind of feed were analyzed.The results showed that,(1)in muscle,the total PUFA contents were significantly higher on Litopenaeus vannamei cultured in sea water than that cultured in low salinity water,however the total MUFA contents were significantly lower on Litopenaeus vannamei cultured in sea water than that cultured in low salinity water,no significant differences were found on total SAFA contents between the two treatments(P＞0.05）.The total ω3 fatty acid contents were lower(P＜0.05) and total ω6 fatty acid contents were significantly higher(P＜0.05)on seawater cultured ones,the ω3/ω6 rate was significantly lower on seawater cultured ones(P＜0.05);(2)in hepatopancres,the total PUFA,MUFA and SAFA contents were significantly higher on Litopenaeus vannamei cultured in sea water,comparing with the low salinity water cultured ones,the total ω3 fatty acid contents were significantly higher(P＜0.05) and total ω6 fatty acid contents were significantly lower(P＜0.05) on sea water cultured ones,the ω3/ω6 rate was significantly higher on seawater cultured ones(P＜0.05) .
