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Reduced feeding effects to the blood and muscle chemistry of farmed juvenile bluefin tuna in the Adriatic Sea

The aim of this study was to investigate effects of reduced feeding to the growth, blood and body chemical composition of bluefin tuna (BFT) juveniles caged in the Central Eastern Adriatic. Stocked fish was randomly placed to two separate cages. Experimental cages were submitted to different feeding regime. One was fed daily to apparent satiation ; the second one was given 22% less amount of food compare to the first one. The fish were sampled just after capture in May 2008. and at the end of experiment in November 2008. Analyzes of selected blood chemical parameters (protein, glucose, triglyceride, cholesterol and HDL-cholesterol) and muscle chemical contents (dry matter, protein, lipid and ash) were done. Individual biomass of fish fed to satiation has increased 230% compare to 190% increase of less fed fish. The mean levels of selected blood chemical parameters were found as follows: wild fish (total protein – 52.4 g l-1 ; glucose – 254.2 mg dl-1 ; triglyceride – 186.7 mg dl-1 ; cholesterol – 156.8 mg dl-1 ; HDL – cholesterol 105.0 mg dl-1), fish fed to satiation (total protein – 59.7 g l-1 ; glucose – 265.3 mg dl-1 ; triglyceride – 277.6 mg dl-1 ; cholesterol – 193.2 mg dl-1 ; HDL – cholesterol 126.5 mg dl-1), less fed fish (total protein – 69.9 g l-1 ; glucose – 271.1 mg dl-1 ; triglyceride – 258.5 mg dl-1 ; cholesterol – 174.9 mg dl-1 ; HDL – cholesterol 122.8 mg dl-1).According to the present results, the blood chemical values of the reared BFT were significantly higher then those of wild, except glucose. Higher blood protein level in less fed fish indicates to a metabolic difference among the fish exposed to different feeding regimes. The body fat content of wild BFT was lower compared to the fed fish, while no appreciable differences in fat content was found among farmed fish.

juvenile bluefin tuna; farming; muscle; blood; proximate composition; Adriatic Sea

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