EFFECT OF ETHYL LINOLEATE, ETHYL LINOLENATE AND ETHYL ESTERS OF HIGHLY UNSATURATED FATTY ACIDS ON ESSENTIAL FATTY ACID DEFICIENCY IN RAINBOW TROUT

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In order to determine if essential fatty acid (EFA) is necesary for rainbow trout as it is for mammals, the fish raised on a fat-free diet long enough to manifest deficiency symptoms were given ethyl esters of linoleic, linolenic and highly unsaturated fatty acids and the following effects were observed.1. The posterior part of fish fed only the fat-free diet for 3 months was discolored and hardened. The posterior fin was worn out. In the extreme cases, the fin had almost disappeared, leaving the terminals of spiral column. Many of the fish died in this group. These symptoms might be caused by EFA deficiency. The fat-free diet was inferior to the diets containing fatty acid esters for weight gain and for efficiency of the diet.2. Among the three fatty acid esters, highly unsaturated fatty acid esters were the best in the accumulation and efficiency of the diet, showing minimum mortality. Ethyl linoleate was the next and ethyl linolenate was the last of the three. Of each ester a 200μg dose was better than 50μg.3. In this experiment, fish fed the diets containing more than 50μg esters per g of body weight per day, failed to cause deficiency symptoms, though a further experiment may be necessary to determine the minimum requirement of these fatty esters.4. A recovery test was carried out with rainbow trout which had been fed the fat-free diet for two months. In the fat-free diet group, the symptoms of the deficiency could still be observed, but in the groups containing the 3 kinds of esters at the rate of 500μg per g of body weight per day, such symptoms were not observed.
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EFFECT OF ETHYL LINOLEATE, ETHYL LINOLENATE AND ETHYL ESTERS OF HIGHLY UNSATURATED FATTY ACIDS ON ESSENTIAL FATTY ACID DEFICIENCY IN RAINBOW TROUT

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