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THE FIRST RECORD AND MORPHOLOGICAL CHARACTERISTICS OF HYBRID OF Rutilus rutilus x Abramis brama MODRAC RESERVOIR, BOSNIA AND HERZEGOVINA
2009, 67 (1) p. 11-23
Avdul Adrović, Isat Skendererović
Abstract
In Modrac reservoir near Tuzla (Bosnia and Herzegovina) for the first time has been determined the presence of the natural hybrid roach and bream. On the 54 samples morphological and meristic characteristics of hybrids have been analyzed, 22 characteristics of the morphology and ihthyomas are analyzed. For each character the variation and mean values were calculated. Proportion of parts of the body are calculated and given as relative values of total length of the body. Beside morphological other meristic characteristics of hybrids have been tested: the number of unbranched and branched signs in dorsal, anal, pectoral and ventral fins, the number of scales in vertical line, number of scales in horizontal lines over and under, number of gill rakers on first grill and pharyngeal teeth. The analysis of sex and age structure of hybrids in which there were 42 males and 12 females has been done. In the age structure of females the dominant age is up to 7+ (5 samples) and 5+ (3 samples). The age structure of males is from 2+ to 7+, where dominant age is 5+ (13 samples) and 2 samples with age structure of 2+. The hybrids growth is intensive up to age of 4+ and then is stationary phase of growth characteristics for both sexes.
Keywords
natural hybrid of roach x bream, modrac reservoir, bosnia and herzegovina