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Studies were undertaken on the relationship between egg size and duration of embryogenesis in four freshwater fish species (Salmo trutta L, Esox lucius L., Gasterosteus aculeatus L., Leucaspius delineatus Heck.). Analyses were carried out in a comparative sense (different taxa) as well as with respect to eggs of the same species, or even laid by the same female. In addition to understandable differences...
Muscle lipids of ten fish species (freshwater: zander, whitefish, roach, burbot and crucian carp; farmed: rainbow trout and carp; and Baltic species: garfish, flounder and sprat) were analysed for fatty acids composition (GC/MS), lipid fractions (HPLC) and susceptibility to oxidation. 100 g of meat of lean freshwater and Baltic fish (roach, flounder, burbot and zander) can provide 50% less n-3 PUFAs...
The study was carried out on the alga Chlorella vulgaris and young specimens of crucian carp Carassius carassius. The algae and fish were exposed to a pesticide gamametox powder containing 0.6% of lindane and 3% of methoxychlor. Gas chromatography method was used to determine the content of these two active substances in the material. Based on the mean lindane and methoxychlor contents it was revealed...
Background. Fish introductions have been a common tool to increase efficiency of utilization of water bodies and diversification of aquaculture production. As a result of increased interest in aquaculture and recreational fishing, throughout the past 70 years, the number of non-native fishes in Bulgaria has dramatically increased. This paper reviews the history, current state, and tendencies of the...
Background. The information on gut microflora in fish is scanty and there is a paucity of knowledge regarding microbial enzyme activity in fish gastrointestinal tracts. Although some information is available on the enzyme-producing bacteria in fish digestive tracts, almost nothing is known about their distribution in different regions of the gut. In the present study, an attempt has been made to investigate...
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