Effect of diet composition on the levels of glucose, lipids, and lipoproteins of the blood and on the chemical composition of two-year-old carp (Cyprinus carpio L.) reared in cooling waters

Abstract

The present study was conducted on two-year-old carp, reared in the production-scale conditions. The fish were kept for 62 days in cooling water and fed feeds differing in the fat content (35.9% of the energetic value of the diet) and carbohy drate content (35.6% of the energetic value of the diet). The experiment resulted in statistically significant differences in the levels of glucose, lipids, and blood lipoproteins as well as in the body composition of the fish in relation to the pre-experiment values and in relation to the ot... lier nutritional groups. INTRODUCTIONThe common carp is one of the principal fish species suitable for rearing in the con trolled conditions. In addition, it constitutes a desirable food item for consumers aware of the need for rational nutrition. These two factors combined, oblige aquaculturists to deliver the fish that is not only of good weight and condition, but is also representing desirable taste-and nutritive values. The principal concern here are the pre-determined values of proteins and lipids in the muscle tissue of the fish. As for the lipids-it is not only their content, but also the quantitative composition. According to the literature data n-3 acids present in the fish lipids play a significant role in prophylaxis of the blood-circulation disor-14 Mariola Friedrich, Katarzyna Stepanowska ders (Gertig and Przyslawski 1994) and they also can lower the frequency of breast cancer and tumors of colon (Ziemlaii.ski and Budzynska-Topolowska 1992; Budzynska-Topo lowska and Ziemlanski 1993). It has been demonstrated in a number of studies that the amounts and the composition of fish lipids are dependent on the feed components. It is not only the lipids, their quantities and the composition (Viola et al. 1981(Viola et al. , 1982 but also car bohydrates (Shimeno et al. 1981). Direct and indirect impact of the lipids and carbohydrates present in the diet on the defined metabolic pathways of the fish organism is indicated by the levels of the components of the carbohydrate-lipid transformations. Among such compo nents we can list: glucose, triacylglycerols, crude lipids, cholesterol and its LDL and HDL fractions (Friedrich 1997).The aim of the present study was to determine a possible effect of various diets, dif fering in the fat content (35.9% of the energetic value of diet) and carbohydrate content (35.6% of the energetic value of diet), on the levels of glucose, lipids, and blood lipopro teins and the body composition of the two-year-old carp. MATERIAL AND :METHODSThe experiment was conducted in summer (July-August) on 180 two-year-old carp at the Fisheries Research Station (RSD) of the Agricultural University of Szczecin, situated at the premises of the Dolna Odra power plant at Nowe Czarnowo. The fish were kept in 6 cages (2.0 x 0.75 x 0.8 m) of the usable volume of 1.0 m 3. Each cage was stocked with a total of 30 fish.The fish were randomly divided into two groups and the differentiation factor was the diet composition. Each group was tested in three repetitions. The fish...

Comparison of Slaughter Yield, Contents of Basic Nutrients, and Heavy Metals Levels in Muscles of Carp (Cyprinus Carpiol.) Farmed in Various Regions in Poland

“…Dwiema skrajnymi zawartościami wody (minimalną i maksymalną) charakteryzowały się mięśnie ryb pochodzących z województw północnych (Hodowla "W-M", oraz Hodowla "K-P"), dlatego też można przypuszczać, że położenie geograficzne hodowli ryb nie wpływa na zawartość suchej masy w ich mięsie. Według Friedrich i Stepankowskiej [7] zawartość wody w mięsie karpia hodowlanego kształtuje się na poziomie 72 -73 %, w innych publikacjach te same autorki [8] podają przedział 69 -70 %. Z kolei Memon i wsp.…”

Effects of intensive culture and feeding isoprotein diets with different fat and carbohydrate contents on cortisol, total protein and protein fractions contents, aspat and alat activities, and on body composition and weight increments in carp (Cyprinus carpio L.) fingerlings

“…However, one cannot exclude a possibility that a higher albumin content in Group II was related to the albumin function to bind different ligands in blood, including free fatty acids (FF A). Earlier studies demonstrated the high triacylglycerol levels in fish fed carbo hydrate-rich diet to enhance the blood FF A levels (Friedrich and Stepanowska 1999).…”

Determination and comparisons of heavy metals (Cobalt and Iron) accumulation in muscle, liver, and gill tissues of Golden Mullet (Chelon aurata) in coastal areas of the Caspian Sea (Mazandaran and Golestan provinces of Iran)

“…The study results on the Neil tilapia (Oreochromis niloticus), northern Mediterranean Sea fish, catfish of the Atatürk Lake in Turkey, whitefish and the pompous fishes (Friedrich and Stepanowska, 1999;Mohamed et al, 2010). The results of this study are based on the lowest absorption and concentration of heavy metals in the muscle.…”

“…The high dispersion of heavy metals on the ground, their various uses, and especially the toxic properties of these heavy metals, have caused this group of metals to become one of the most important environmental pollutants. On the other hand, industrial waste, geochemical structure and, mining of metals are the potential sources of heavy metal contamination in the aquatic environment (Friedrich and Stepanowska, 1999). These heavy metals are divided into two classes, transition metals and, metalloids.…”