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Gonad weight, absolute and relative fecundity, and the maturity coefficient of female eastern bream Abramis brama in the Talimardzhan, Utchkyzyl, and Yuzhnosurkhan reservoirs located in southern Uzbekistan were studied. Females mature at the age of 3, when the fish reach 27, 21, and 22 cm in the three reservoirs respectively. Also, the correlation coefficient and regression between these characteristics and fish sizes were determined.
A biometrical description of the inferior pharyngeal bones ossa pharyngea inferiora, collected from 94 common bream Abramis brama from the Szczecin Lagoon (on November 1995) is presented. The problem of bilateral asymmetry of the pharyngeal teeth is included separately.
20 individuals of Abramis brama from Gosławskie Lake and 10 individuals from Gopło Lake, central Poland, were investigated on the presence of trypanosomes. The infections of Trypanosoma abramidis LAVERAN and MESNIL, 1904 were detected in three breams from Gosławskie Lake and two in Gopło Lake. The question of the distinctivity of T. abramidis from T. carassii MITROPHANOW, 1883 found in other Cyprinidae in Poland is discussed.
Influence of NH3 in doses of 0.1-0.5 mg/dm3 on performance ability of the common bream was studied at 15 and 20°C using a method of burdening the fish with predetermined physical effort. The ergometric readings revealed, that within the range of 0.12-0.13 mg of NH3/dm3 there was no effect of ammonia on lowering the performance ability of the fish. Within the concentration range of 0.37-0.39 mg of NH3/dm3, at 15°C the value of work declined to 54% and at 20°C-to 22% of the respective values of control group.
Studies were carried out in 1987 and 1988 on the content of food tracts of 636 bream and 537 white bream from Zegrzyński Dam Reservoir. Samples were collected from three stations: Wierzbica, Bug and Zegrze. The fish fed mainly on Chironomidae (larvae and pupae) and Mollusca. Chironomus sp. and Glyptotendipes sp. were the two most frequently consumed genera from among the Chironomidae larvae.
Diagnostic features of bream and white bream scales were investigated. Bream scales were collected from seven sites and white bream ones came from four sites. Both environmental conditions and fish growth rate varied in the chosen sites. The scales taken from the analysed populations varied in shape, localisation of the scale nucleus, number of radii on caudal and oral fields, and by different ratio between their height and width.
The aim of the study was to compare fat and total cholesterol content in the meat of perch (Perca fluviatilis L.), ruffe (Gymnocephalus cernua L.), and bream (Abramis brama L.) caught in fall from Lake Gopło and the Włocławski Reservoir. Analyses were carried out on 128 fish. Fat was extracted from meat with the skin using the procedure of Folch et al. (1957), and the content of total cholesterol was determined by the UV-VIS method according to Liebermann-Burchardt (Strzeżek and Wołos 1997). The mean value of fat in the meat of perch, ruffe, and bream was 0.41, 0.49, and 1.02% wet weight, respectively, and the differences were statistically significant (p<0.05). The analysis indicated that there were no statistically significant differences in the mean value of fat in the muscles of ruffe caught from Włocławski Reservoir (0.50%) and Lake Gopło (0.48%). There were statistically significant differences among the other species (p<0.05). There were no statistically significant differences in the total cholesterol content between the ruffe caught in Włocławski Reservoir (49.49 mg 100 g-1) and Lake Gopło (51.75 mg 100 g-1) (p>0.05). The mean values of the cholesterol in the meat of perch and bream caught from the two different basins differed significantly statistically (p<0.05).
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