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Ivanova A.,Institute of Fishery and Aquaculture | Hadzhinikolova L.,Institute of Fishery and Aquaculture
Bulgarian Journal of Agricultural Science | Year: 2015

The purpose of the present study was to determine the nutritional quality of carp lipids on the basis of fatty acid ratios and lipid indices. The experiments for fatty acids content of lipids were carried out in 2012-2013 in common carp (Cyprinus carpio L.) for human consumption reared in production systems with various level of intensification (semi-intensive, intensive, superintensive) and farming techniques (earth ponds, dam lakes, net cages). In this study, the biologically important ω-6: ω-3 fatty acid ratio in carp meat lipids was established. It was shown that in 7 out of the 9 studied production systems, ratios were within the optimum range according to modern concepts of healthy human nutrition (< 5.0). The determined ratios of polyunsaturated to saturated fatty acids in carp lipids were between 0.53-1.64. The lipids of the studied groups of carps from production systems with various level of intensity possessed very good anti-atherogenic and anti-thrombogenic properties, as the values of respective lipid indices were lower than 1.0 (index of atherogenicity from 0.24 to 0.51 and index of thrombogenicity from 0.39 to 0.61). The higher (< 1.0) cholesterolemic indices (2.03-4.62) determine the good hypocholesterolemic potential of meat lipids in studied carp production systems. This is a parameter of the relatively high functional and biological activity of meat lipids and their beneficial effect on human health. © 2015, National Centre for Agrarian Sciences. All rights reserved.


Uzunova E.,Sofia University | Hubenova T.,Institute of Fishery and Aquaculture | Georgieva M.,National Agency of Fishery and Aquaculture
Bulgarian Journal of Agricultural Science | Year: 2015

The current study was initiated to gather baseline scientific information on the biological characteristics and general status of fish resources in the Dospat Dam Lake, with an emphasis on key harvested species. The main purpose of this dam is producing hydroelectric energy, but the reservoir also contains one of the biggest cage aquaculture facilities in Bulgaria. Stocking activities with different species (Coregonus peled, Onchorhinchus mykiss and Cyprinus carpio) have been conducted over the years. The fish composition observed in this investigation was compared with those from previous studies to outline the main changes in fish composition during the period from the dam’s construction to nowadays. A total of 468 specimens were caught by gillnets and trap nets. Fish were collected from May 2009 to November 2011. Eleven fish species, belonging to five families (Cyprinidae, Cobitidae, Salmonidae, Percidae and Centrarhidae), were found. Three of them are exotic (Pseudorasbora parva, Lepomis gibbosus and O. mykiss). Three fish species are new in comparison to those reported previously (P. parva, L. gibbosus, and Zander lucioperca).A significant change was observed in the dominant fish species over the years. At present, Rutilus rutilus and Perca fluviatilis predominate in the catches. In the littoral zones, pumpkinseeds were the most abundant species. The dominant species Barbus cyclolepis in the past was not found. Biological data (size length frequencies and age distribution) are reported for the dominant fish species. © 2015, National Centre for Agrarian Sciences. All rights reserved.


Hadzhinikolova L.,Institute of Fishery and Aquaculture | Hubenova T.,Institute of Fishery and Aquaculture
Bulgarian Journal of Agricultural Science | Year: 2015

The aim of the present study was to determine meat chemical composition and energy value of rainbow trout (Oncorhynchus mykiss W.), caught in the free aquatory of the Dospat dam lake. The weight of caught fish (April, 2012) ranged between 200-1700 g, so they were divided into 4 weight groups: Group І - weighing 200-300 g; group ІІ - weighing 500-700 g; group ІІІ група -weighing 900-1000 g; and group ІV - weighing 1500-1700 g. Specific differences in the meat chemical composition in studied weight groups of rainbow trout caught from the free aquatory of the Dospat dam lake were established. A tendency for reduction of the amount of water and increase in dry matter and fat contents along with weight increase was observed. Protein levels were more stable fluctuating around a relatively high level of 20.20 -21.42%, that is why trout could be classified in the group of high-protein fish. According to the meat fat content, the studied groups of rainbow trout were classified in the group of medium-fat fish (live weight 200-1000 g) and fatty fish (live weight 1500-1700 g). The energy content of trout meat ranged between 429.64-679.73 kJ.100 g-1. With regard to the relative proportion of proteins, the meat of studied groups of rainbow trout’s competes with poultry and veal meats, and was superior to lamb and pork meats. © 2015, National Centre for Agrarian Sciences. All rights reserved.


Hadzhinikolova L.,Institute of Fishery and Aquaculture | Mihailova G.,Trakia University | Ivanova A.,Institute of Fishery and Aquaculture
Bulgarian Journal of Agricultural Science | Year: 2015

The purpose of the present study was to investigate the content of macrominerals and trace elements in the meat of carp, reared in different production systems. The experiments for fatty acids content of lipids were carried out in 2012-2013 in common carp (Cyprinus carpio L.) for human consumption reared in production systems with various level of intensification (semi-intensive, intensive, super-intensive) and farming techniques (earth ponds, dam lakes, net cages). The content of the primary macrominerals and trace elements in carp meat and its specificity related to the used production system has been established. It was demonstrated that the prevailing macrominerals were the potassium (2713.86 3552.22 mg.kg-1) and the phosphorus (2261.18 2417.86 mg.kg-1). Out of the studied trace elements, carp meat had a higher content of iron (4.43 7.14 mg.kg-1) and zinc (2.22 8.88 mg.kg-1). The results from this study could be used as objective information for evaluation of the nutritional value of carp meat with regard to the content of macrominerals and trace elements. © 2015, National Centre for Agrarian Sciences. All rights reserved.

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