Abstract
Various dietary fats were used to assess their impact on the fatty acid profile of snakehead murrel, saul (Channa striatus). The saul grow-out (av. wt. 27.36 ± 0.09 to 32.54 ± 0.41 g) were fed for 12-weeks with seven experimental diets (F1, F2, F3, F4, F5, F6 and a control, F7 of natural foodstuffs, NATFO). F1 (L3HUF) contains 0.5% n-3 fatty acid & 7.5 % saturated oil; F2 (H3HUF) contains 1.0% n-3 fatty acid & 7.0% saturated oil; F3 (MUSOL) contains 8.0% mustard oil; F4 (LINOL) contains 8.0% linseed oil; F5 (MIXOL) contains 4.0% mustard oil and 4.0 % linseed oil; F6 (SATOL) contains 8.0 % saturated oil. The muscle polyunsaturated fatty acids (PUFA) contents varied with different dietary lipids level which impacted on deposition of fatty acid in flesh. The muscle unsaturated fatty acids, including Docosahexaenoic acid (22:6n3, DHA) and Eicosapentanoic Acid {C20:5n-3, EPA), levels, were comparatively higher in MIXOL diet followed by H3HUF than in the other diets, indicating selective deposition of various fatty acids in each feeding trial. It was concluded that dietary fats in the diet has role in the carcass composition of fatty acid profile in Channa striatus and the MIXOL (contains mustard oil and linseed oil: 1:1 w/w) could be safely used for better deposition of beneficial healthy fatty acids like EPA and DHA. The addition of mustard oil and linseed oil in the diet are comparative better if we look towards economizing the cost of the brood-stock feed in comparison to the addition of pure fatty acids in the fish diets.
Highlights
It is reported[1] that fish reared in intensive culture systems require all nutrients in a complete diet
India has huge potential for the production of cheaper plant sources e.g. de-oiled cakes like linseed oil cake etc. rich in essential fatty acid (EFA, omega-3 HUFA) which can be utilized as source of lipid in carnivorous fish nutrition for growth purposes and for gonadal maturation through dietary manipulations
In order to evaluate the effect of different oil sources on the carcass fatty acid profile of C. striatus, the experiment was conducted in indoor condition in 14 (7 types of feed, 2 replicates) round plastic pools of 300 litre capacity, each filled-up with 100 litre tube well water
Summary
It is reported[1] that fish reared in intensive culture systems require all nutrients in a complete diet. Rich in essential fatty acid (EFA, omega-3 HUFA) which can be utilized as source of lipid in carnivorous fish nutrition for growth purposes and for gonadal maturation through dietary manipulations. Recycling of these agro-based by-products, like mustard oil cake, linseed oil cake etc. The fatty acid composition of these various ingredients of plant origin have a good source of HUFA which can be utilized for carnivore fishes nutrition These can be very well used in place of animal lipid source, and can be studied for the deposition of nutrients in terms of flesh and maturation of the female fishes as well. The impacts of various dietary oils on lipid metabolism of fish are still not very
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