Abstract
Ten different compounded diets containing linoleic acid, C18: 2ω6 and linolenic acid, C18: 3ω3, in varying proportions, were fed to Palaemon serratus (Crustacea Decapoda) and the resultatn growth rates were measured. These results were then compared with those obtained from a compounded diet containing cod-liver-oil rich in long-chain poly-unsaturated fatty acids, C20: 5ω3 and C22: 6ω, and from natural food. Growth rates obtained with the cod-liver-oil and natural diets were in all cases superior to those obtained with diets containing linoleic and linolenic acid. The best growth rates from the latter diets were obtained when the C18: 2ω6/C18: 3ω3 ratio equalled 2.2. Compounded diets containing linoleic and linolenic acids in this proportion produced the lowest C20: 5ω3, C22: 6ω3, and C18: 3ω3 content in the specimens examined. Palaemon serratus would appear to be capable of synthesizing C20: 5ω3 and C22: 6ω3 from C18: 2ω6 and C18: 3ω3. Growth rates are improved when C20: 5ω3 and C22: 6ω3 are supplied directly in the diet.
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