FEEDING OF COMMON PRUSSIAN CARP СARASSIUS GIBELIO IN THE DANUBE LAKES YALPUG AND KUGURLUY
Journal Title: Naukovyi visnyk Chernivetskoho universytetu. Biolohiia (Biolohichni systemy) - Year 2014, Vol 6, Issue 1
Abstract
The Danube Lakes form the most lake complex in Ukraine. The Yalpug Lake is the largest lake within the complex. Its area is about 149 km2, volume – about 387 million m3. Yalpug connects Kugurluj Lake in the south with a wide canal in the sand-spit, which separates the two lakes. In fact they form a single lake system. The connection of Yalpug with the Danube is possible through Kugurluj Lake as well as directly over the canal Large Rapid. The area of Kugurluj Lake is less twice (82 km2), volume is four times less (82 million m3). Lake Kugurluj is connected with the Danube River by two channels Skunda and the canal Large Rapid. These lakes have significant fisheries potential that is not fully realized. The construction of dams in the second half of the twentieth century led to decreasing of link between lakes and the Danube River. This resulted in reconfiguration of lake ecosystems and their impact on fish productivity. Now Prussian carp Carassius gibelio is numerous in the Danube Lake fish fauna, it ranks the second place in the fishery after the Silver carp Hypophthalmichthys molitrix. Over the past ten years, the average value of the catches of Prussian carp in the lake complex Yalpug - Kugurluj is 200.6 tones per year. In the Yalpug and Kugurluj Lakes in the diet of Prussian carp zoobenthic and planktonic organisms (38 taxa) belonging to 4 types, 7 classes, 17 orders and 23 genera were found in 2011. In the diet of fish the most important by weight were zebra mussel Dreissena polymorpha, mussels from family Cardiidae, as well as representatives of plankton – crustaceans (Cladocera). According to the values of the index of relative importance zebra mussel Dreissena dominated in carp`s food in the Yalpug Lake throughout the year. Mollusks from Cardiidae genus were also important in summer and autumn. Among the crustaceans in both lakes in the diet of fish Cladocera occupied the first place almost always. In all seasons, Prussian carp actively consumed zebra mussel Dreissena in the lake complex. Amphipods and gastropods of Cardiidae genus can be considered as his favorite food in summer in Yalpug. In Kugurluj carp actively consumed Amphipoda
Authors and Affiliations
М. П. ЗАМОРОВА, В. В. ЗАМОРОВ
Keywords
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