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RESEARCH OF THE ICHTHYOFAUNA IN THE PROTECTED AREA "MANDRA-PODA", "CHENGENE SKELE BAY" AND "OTMANLI" UNDER NATURA 2000 IN BULGARIA
Abstract
For the period 2011-2021, 231 fish species from 18 families were established in protected area BG0000271 -Mandra-Poda-, 345 fish species from 7 families in protected area BG0001502 -Otmanli- and 169 species from 11 families in a protected area BG0000242 -Chengene skele Bay-. One hundred eighty-seven of the species were freshwater, 256 were typical marine fish species, and the other one hundred and fifteen were anadromous and brackish species. Protected species are Rhodeus amarus, Cobitis taenia, Chalcalburnus chalcoides, Alosa immaculata. The dominant fish species in the area are species from the family Mugilidae - Mugil cephalus, with 1800 ind./ha and biomass of 36.67 kg/ha. The population of M. cephalus from these three protected areas is represented by 1 (33.54%), 2 (14.59%), 3 (23.58%), 4 (18.52%) and 5 (9.78%) years old fish; for Ch. auratus: 1 (39.41%), 2(44.21%), 3 (14.28%), 4 (1.98%) and 5 (1.12%) and for Ch. saliens respectively data are as follows: 1 (28.74%), 2 (55.44%), 3 (14.5%) and 4 (1.32) years old fish. The most abundant are the M. cephalus with a length of 24.1 - 25 -m (14.91%). The relation between the fish length and the radius of the scales for the M. cephalus is L = 2.582S - 1.9712, r = 0.9974. The relation between fish length and fish weight for the M. cephalus is W = 0.0132L3.0654, r = 0.9938. The coefficient of Fulton (kf) is 1.77.
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References9
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