Fatty acid profile and cholesterol content in muscle tissue of one year old common carp (Cyprinus carpio) during growth | Masnokiselinski sastav i sadržaj holesterola u mišićnom tkivu jednogodišnjeg šarana (Cyprinus carpio) u fazi uzgoja

The aim of this paper was to investigate chemical and fatty acid composition of both fish filets and feed, as well as cholesterol content of common carp (Cyprinus carpio) in the final breeding stage during spring and summer (April and June). Studying these parameters in the production stage will allow the insight in all significant factors in order to obtain high quality aquacultured products. Results obtained for the chemical parameters of feed (protein, moisture, fat and ash content) lead to the conclusion that the chemical composition was approximately the same in April and June. Chemical composition of carp filets is also steady during this period. It is also determined that cholesterol content in carp filets is significantly different in April and June (48.87 mg/100g in April and 54.31 mg/100g in June). Statistical analysis was carried out by applying Students t-test comparing the average values of cholesterol content during the experiment. Fatty acids content in feed samples has been correlated with the fatty acids content of the carp filets and the calculated values of Parsons correlational coefficient for April and June were: r = 0.8187 and r = 0.8026 respectively. The corresponding values of t parameter are 5.14 and 4.85 (t sub(crit) = 2.16, P = 0.05), which points out to the significant correlation between fatty acids composition of feed and investigated fish samples. On the basis of fatty acids composition of carp filets, the content of n-3 and n-6 polyunsaturated fatty acids was determined as well as n-3/n-6 ratio in carp filets which, in April, was 0.19 (n-3:n-6=1:3.6). Ratio of n-3/n-6 in feed was 0.06 (n-3:n-6=1:15.8) in April and 0.05 (n-3:n-6=1:18.9) in June. The content of n-3 and n-6 PUFA per 100g of carp filets was calculated, as well as the content of EPA and DHA and their respective values are: 115.42 mg/100g; 562.05 mg/100g; 18.90 mg/100g and 124.07 mg/100g in April and 195.45 mg/100g; 685.75 mg/100g ; 22.75 mg/100g and 19.20 mg/100g in June.