Growth performances and hematological characterisation of rainbow trout (Oncorhynchus mykiss Walbaum, 1792)

In present study correlations between hematologic characteristics and growth performances of rainbow trout were investigated. Fish were provided from a raceway trout farm located in the valley of the river Jerka near the city of Novi Pazar (N:43°13’67’’; E:20°43’96’’). The farm consists of 8 concrete lined production ponds (22 x 3 m x 1,2 m each) in which water is exchanged 75 times per day. After stocking fish from production ponds are being monthly classified into two groups depending on their body mass and body length and larger fish are transferred in separate ponds. For this study one year old fish were sampled. 25 from slower and 25 from faster growing group. Analyses were performed in 4 consecutive days in accordance with animal welfare regulations (Official Gazette of the Republic of Serbia 41/2009). Fish growth performances were estimated from body mass, total and standard body length and Fulton condition factor. Hematological characterization of rainbow was established on the basis of Red Blood Cell (RBC) and White Blood Cell (WBC) count, hemoglobin concentration, Packed Cell Volume (PCV), Mean Corpuscular Volume of erythrocytes (MCV), Mean Corpuscular Hemoglobin in individual erythrocyte (MCH) and Mean Corpuscular Hemoglobin Concentration (MCHC) in a liter of erythrocytes. The results obtained were statistically analyzed by SPSS. It was found out that there exist significant correlation between hematological and growth characteristics. High linear regression coefficients can explain mass and length gain by hematological parameters

Drinking water quality in rural regions of different hydrographic areas

Drinking water researches were conducted in rural regions of different hydrographic areas. In regions of Lijevče polje population mainly use for drinking water from the wells and water pumps, while in Eastern Herzegovina use water from springs and by capping groundwater. Water analysis form chosen locality was conducted four times during a year by season aspects on chosen springs. Results show that the water Vrijeka spring (Eastern Herzegovina) satisfies basic physicochemical and microbiological criteria for water that is used for drinking. Water from the well in village Berek (Lijevče) is not safe for the health because it is slightly acidic, muddy and has increased concentration of orthophosphates and suspended substances, while the water on the Trošelji locality correspond to the drinking water, by monitored criteria

Evaluation of environmental conditions by fish hematology

In the work are shown basic principles of application of the haematological status in determination of physiological status of fishes, also a review of a number of research from this area is given. One part of the research includes analysis of parametres of hematological status of the individuals in their natural habitat, while the other part is focused on the research of these parametres in experimantal conditions based on changes of some of the factors. Review include erythrocyte line parameters (erythrocyte number, hemoglobin concentration, hematocrit, MCV, MCH and MCHC) in different conditions in species: Barbus balcanicus, Sqalius cephalus, Thymallus thymallus, Oncorhynchus mykiss, Carassius gibelio, Perca fluviatilis, Cyprinus carpio

Growth performances and hematological characterisation of rainbow trout (Oncorhynchus mykiss Walbaum, 1792)

In present study correlations between hematologic characteristics and growth performances of rainbow trout were investigated. Fish were provided from a raceway trout farm located in the valley of the river Jerka near the city of Novi Pazar (N:43°13’67’’; E:20°43’96’’). The farm consists of 8 concrete lined production ponds (22 x 3 m x 1,2 m each) in which water is exchanged 75 times per day. After stocking fish from production ponds are being monthly classified into two groups depending on their body mass and body length and larger fish are transferred in separate ponds. For this study one year old fish were sampled. 25 from slower and 25 from faster growing group. Analyses were performed in 4 consecutive days in accordance with animal welfare regulations (Official Gazette of the Republic of Serbia 41/2009). Fish growth performances were estimated from body mass, total and standard body length and Fulton condition factor. Hematological characterization of rainbow was established on the basis of Red Blood Cell (RBC) and White Blood Cell (WBC) count, hemoglobin concentration, Packed Cell Volume (PCV), Mean Corpuscular Volume of erythrocytes (MCV), Mean Corpuscular Hemoglobin in individual erythrocyte (MCH) and Mean Corpuscular Hemoglobin Concentration (MCHC) in a liter of erythrocytes. The results obtained were statistically analyzed by SPSS. It was found out that there exist significant correlation between hematological and growth characteristics. High linear regression coefficients can explain mass and length gain by hematological parameters

Indicators of the environmental state of the Bilećko Jezero Lake

The research refers to the physical, chemical and microbiological parameters of the Bilećko Jezero Lake water quality. The monitoring of physical and chemical parameters and their interaction with other parameters helps estimate the water quality and any possible changes. Some parameter values and their alteration directly affect the water life. The research was performed at three sites: the Grančarevo watergate, the Trebisnjica River fountain and Orah in the period 2006-2009, and the results of conducted physical and chemical analyses indicate that the water quality was satisfactory, albeit with certain deviations. Bacteriological analyses showed that the water of Bileća accumulation, especially at the Izvor site, was burdened with fecal material