Showing papers on "Fish oil published in 1981"

Effect of oxidized fish oil, DL-alpha-tocopheryl acetate and ethoxyquin supplementation on the vitamin E nutrition of rainbow trout (Salmo gairdneri) fed practical diets.

Abstract: A factorial experiment was conducted using two degrees of oxidation of the 7.5% supplemental fish oil (peroxide values of 5 and 120 meq/kg oil), two levels of supplemental DL-apha-tocopheryl acetate (0 and 33 mg/kg diet) and two levels of ethoxyquin (0 and 125 mg/kg diet) supplementation. Dietary thiobarbituric acid number, weight percentage of polyunsaturated fatty acids and omega-three fatty acids in the total fatty acids were significantly (P less than 0.05) different between diets with fresh and highly oxidized oil. Dietary RRR-alpha-tocopherol was significantly (P less than 0.05) reduced by the addition of highly oxidized oil after 24 weeks storage of the feed while supplemental DL-alpha-tocopheryl acetate level was not changed. Fish fed the various diets showed no differences in growth, feed:gain ratio, carcass composition or plasma glutathione peroxidase activity. The mortality, percent red cells hemolyzed by hydrogen peroxide, plasma and liver RRR-alpha-tocopherol concentrations were significantly (P less than 0.05) affected by the addition of highly oxidized oil or DL-alpha-tocopheryl acetate but not by ethoxyquin except that mortality was reduced by supplementary ethoxyquin. The results of this study suggested that no vitamin E or ethoxyquin supplementation was needed to prevent a deficiency of vitamin E in rainbow trout fed a practical diet containing 7.5% of a good quality herring oil for 24 weeks.

Introduction to fishery by-products

Abstract: Fish meal production use of fish meal in animal nutrition fish oil production and use in foods fish silage hydrolyzed fish products fish protein concentrate (FPC) other methods of utilizing fishery by-products.

Identification and quantification of prostaglandin E3 in renal medullary tissue of three strains of rats fed fish oil.

Abstract: Three strains of rats were fed a fish oil diet to verify their ability to incorporate and convert dietary eicosapentaenoic acid (20∶5ω3) into trienoic prostaglandins. Our results show that such conversion indeed occurs in kidney medullae homogenates. Specifically, the presence of prostaglandin E3 (PGE3) was established by gas chromatographic-mass spectrometric (GC-MS) analysis. That compound was conclusively identified by comparison of fragment ions and their relative intensities with those obtained from authentic PGE3. Further evidence was provided by studying the recovery of exogenously added PGE3. The crude ethyl acetate extracts of the medullary homogenates were methylated and cleaned up by liquid-gel chromatography with Lipidex-5000 prior to conversion to PGB3 for GC-MS analysis. The PGE3 was quantified by selected ion monitoring (SIM) with [3,3,4,4-2H4PGE2 as internal standard. The levels of PGE3 were similar, about 3 ng/mg of wet tissue, in the 3 strains of rats. Identical in vivo conversion of the 20∶5ω3 fatty acid to PGE3 could not be positively established by analysis of pooled urine specimens.

Fishmeal and oil from lantern fish (myctophidae) with special emphasis on protein quality.

Abstract: Fishmeal made from lantern fish (family: Myctophidae; genus: Benthosema pterotum) had proximate, mineral, amino acid and fatty acid composition within the range reported for fishmeal made from conventional fish. Similarly, the pressed-out oil had a fatty acid composition and content of unsaponifiables as reported for conventional fish oil. The content of unsaponifiables in the body fat of the fish indicated that wax esters contributed a minor part of the lipids of this species of lantern fish. Determined in chicks, the true digestibility of the amino acids varied from 92% (arginine) to 73% (hydroxyproline) which for most of the amino acids was 1-3% units lower than that found for a high-quality capelin fishmeal. No differences in rate of mortality, growth rate and feed consumption and utilisation were found between lantern and capelin fishmeal when they replaced increasing amounts (0 to 100%) of soya bean meal as protein supplements (72% of total protein) to cereal diets, both fishmeals reducing feed consumption and causing a significant improvement in feed utilisation compared with soya bean meal. The data indicate that lantern fish may be used for the production of fishmeal.

Changes in composition and enzyme activities of mitochondrial and post-mitochondrial fractions of tissues of rats given mustard oil diet with carnitine and/or fish oil.

Abstract: The effects of short-term feeding of a 20% mustard oil (containing 47% erucic acid) diet with 0.1% carnitine and/or fish oil on the activity of enzymes of lipid metabolism in mitochondrial and post-mitochondrial fractions of heart, liver, and skeletal muscles of rats were determined to study the reversal of erucic acid-induced lipidosis. Histopathological changes were also studied. The inclusion of fish oil or fish oil plus carnitine in a mustard oil diet, especially the latter, eliminated the histopathologically detectable lipidosis in heart and skeletal muscles. The reason for this appears to be the increased activity of lipase and phospholipase in tissue homogenates and of cholesterol ester hydrolase in the post-mitochondrial fraction; and also an increase in mitochondrial succinate dehydrogenase which may increase the utilization of the liberated fatty acids. The results suggest that the erucic acid-induced lipidosis is prevented or eliminated by increased lipolysis and oxidation of fatty acids when such a diet is supplemented with carnitine and/or fish oil.

Production of feed for cultivated eel

Abstract: PURPOSE:Fat is added to feed for cultivated eels to prevent the feed powder from both solidifying and flying away. CONSTITUTION:The major components of the feed such as fish powder, a tackifier such as alpha-form starch from potato, yeast, bread crumb, vitamines or minerals are combined in such a proportion that the major component is 70%, the trackifier is 20% and other additives are 10% and they are crushed until the fraction passing through 72 mesh becomes 95-98%. The added fat may be any animal or vegetable oil, however, liquid fish oil, especially the liver oil of walleye pollack, is preferred. The fish oil is sprayed to the powdered feed or after spraying the feed is powdered. The amount of the oil added is preferably 0.5-1.5%.