도미 유사어종의 식품학적 품질 비교 및 도미회의 원료 판별

Abstract

The mullet(chelon lauvergnii), red drum(sciaenops ocellatus) which is a similar species of red sea bream(pagrus majro) are difficult to be distinguished due to its comparable features of color and shape as sliced raw fish. Because of this, almost low-budget fish restaurants have been selling the mullet or red drum as the red sea bream which is more expensive. This study investigated to confirm the differences among red sea bream, mullet and red drum by comparing their food quality and ecological characteristic. To judge the origin raw material of red sea bream sliced raw fish, several distinction index components which can clearly show the differences among them were adopted. Moreover, a survey was conducted in order to compare an appearance, tensile stress and standard of red sea bream distinction before and after training the way of red sea bream distinction. In proximate components, red sea bream, mullet and red drum's moisture contents were 72.35±0.37%, 73.47±0.35% and 70.78±0.04% respectively, And crude protein contents were 19.58±0.06%, 19.93±0.18% and 20.97±0.66% respectively, In addition, they presented 1.37±0.07%, 1.27±0.08% and 1.19±0.08% respectively in crude ash contents, and 7.07±0.17%, 1.89±0.24% and 5.36±0.43 respectively in crude lipid contents. Most proximate components were not significantly different among three species, but red drum contained lowest lipid contents and mullet was highest. Mineral and heavy metal contents of muscle of three species are significantly different, but not much. Constituent fatty acid were different among species and omega-3 fatty acid contents were 17.08%, 6.45%, 18.29% at red sea bream, mullet and red drum. In breaking strength, 3 species were not significantly different, and red sea bream was the lowest level and red drum wes the highest level. In electrophoresis, red sea bream and mullet were clearly featureless and 18 raw sliced fish bought at sea food restaurants were not distinguishable at SDS-PAGE, showing that bands were not clearly different. For appearance, red sea bream and mullet were distinguishable, but red sea bream and red drum were similar that cannot be distinguish. For tensile stress test, the length of stretched spring was 3.5±0.1cm, 4.7±0.2cm, 5.0±0.2cm at red sea bream, mullet and red drum. red drum's lowest tensile stress means its flexibility is the highest. The survey was conducted to confirm result of education that distinguishing red sea bream and its similar fishes by making education manual was conducted. In result, trained people can distinguish by simple appearance and tensile stress test.