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Endangerment of fish habitats worldwide is a global problem. Breeding fish in restocking hatcheries is important for bioconservation of many fishes. Analysis of biochemical and hematological parameters provides important information on spawning performance and fish health. Variations of different serum biochemical constituents and increase in body length and mass of West Balkan trout were analyzed during spawning and postspawning. High body weight deviations of males were found in both periods. The body length and weight of males is higher compared to females. After spawning, higher growth was observed in males. Biochemical values are higher in females in relation to males. Low values of glucose, chloride, and potassium are present in the spawning phase. Decreases in protein, triglycerides, cholesterol, AST, sodium, and calcium levels were found in postspawning. Serum biochemical constituents of females vary significantly compared to males. Serum markers indicate a strong association with metabolic processes, which allows for better nutritional control and management of environmental factors, especially the presence of organic particles in the broodstock.

journal of applied aquaculture

Seasonal fluctuations of the serum basal biochemical profile in spawning and postspawning West Balkan trout ( Salmo farioides , Salmonidae): Implications for fish biology and aquaculture