Their study indicated a large
variability in the amount of hemoglobin (56e65%) present in
unbled and bled mackerel fish. Moreover, the authors also
concluded that lipid oxidation in fish muscle is affected by the
concentration and types of hemoglobin. In the present study, the
detection of more oxidized and off-flavor in reddish catfish fillets in
comparison to normal catfish fillets could be attributed to the overabundance
of hemoglobin. Richards, Dettmann, and Eric (2005)
observed that the release of heme from hemoglobin accelerated
lipid oxidation in cod muscle. Similarly, Grunwald and Richards
(2006a), (2006b) examined the role of heme proteins (hemoglobin
and myoglobin variants) in causing lipid oxidation in raw and