The Israeli Journal of Aquaculture - Bamidgeh 55(1), 2003, 61-68

PREDICTION OF CARCASS QUALITY TRAITS OF
COMMON CARP BY X-RAY COMPUTERIZED TOMOGRAPHY


C. Hancz*, R. Romvári, Z. Petrási and P. Horn
Faculty of Animal Sciences, University of Kaposvár, 7400 Kaposvár, P.O. Box 16, Hungary

(Received 9.11.02, Accepted 18.11.02)

Key words: carcass quality, common carp, computerized tomography, fat content, prediction

Abstract

X-ray computerized tomography (CT) and chemical analysis were used to determine the fat and protein contents in the fillet of table-sized mirror carps. Serial CT scans were taken along the body from the operculum to the beginning of the caudal fin. After scanning, the anesthetized fish were immediately processed; slaughter value and fillet yield were determined before taking samples for chemical analysis. Independent variables of prediction equations were produced from the CT density values, which ranged from -90 to 160 on the Hounsfield scale. Based on the data derived from the CT scanning, areas (cm²) of muscle and fat tissue were identified. Fat deposition was highest in the dorsal fin region. The muscle area varied according to the body shape and seems to be inadequate for predicting the slaughter value of common carp. The fat and protein contents of the fillet, when predicted from scanning only the dorsal region, were as accurate as when predicted from scanning the whole body and were R² =0.88 and 0.86, respectively.


*Corresponding author: e-mail: hancz@mail.atk.u-kaposvar.hu

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