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Pashkov Andrey Nikolayevich
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Articles count: 2
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CHARACTERISTICS OF THE DYURSO RIVER ICHTHYOCENOSIS
DescriptionIn the article we have described the history of the studies and the modern features of fish community of the Black sea's river Durso (the length 14 km). It was established, that in present time the river includes only seven species of fishes from three ecological groups: freshwater (five species), saltwater (one specie) and marine (one specie). A bleack (Alburnus alburnus) and Colchis minnows (Phoxinus phoxinus colchicus) dominate by quantity in the structure of Durso river fish community, bleack and Prussian carp (Carassius auratus gibelio) dominate by biomass. The negative changes of Durso river conditions were found in compare with the last years. First of all, it appears in biological pollution of fish species allochthonous for this river. In the period of the Durso river monitoring (1935–2014) it was established the distinct raise of allochthonous components with parallel reduce of variety of autochthonous fresh waters rheophilic species. The main reason is the building of reservoir in upper flow of the Durso river in 1976. The additional negative factor influence on of the Durso river fish community is the falling down of the water level during the important period of fish lifecycle. The best condition of fish community is in the middle part of the river were reaches combine with the cold springs and powerful flow
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EFFECTS OF INCREASED WATER TEMPERATURES ON REPRODUCTIVE CHARACTERISTICS OF RAINBOW TROUT FEMALES
DescriptionThe effects of increased water temperatures on the reproductive characteristics of rainbow trout females were studied. It was found, that the increased water temperatures produced negative effects on the gonad maturation and survival of the embryos when acted at the late stages (IV and V) of female gametogenesis, but not at the earlier (III) stage