Proximate and protein compositions of the ordinary muscle of requiem shark Triakis scyllia were examined. The proximate composition of the dorsal muscle was: moisture 76.0%, crude protein 24.9%, crude fat 2.7%, and crude ash 1.3%. The protein content corrected for urea (5.4mgN/g) and for non-protein nitrogenous compounds (11.2mgN/g) was 21.5% and 17.5%, respectively. The protein compositions of the dorsal and ventral muscle remained unchanged essentially through pre-, in-, and post-rigor stages: In the dorsal part, sarcoplasmic 22.1–25.9% (av. 24.5%), myofibrillar 60.1–66.8% (63.2%), alkali-soluble 4.1–5.5% (4.7%), and stroma fraction 6.5–8.9% (7.6%). In the ventral part, corresponding data were 20.4–26.1% (24.2%), 58.4–67.2% (63.5%), 2.9–9.2% (6.1%), and 3.8–8.2% (6.1%), respectively. The protein composition of each muscle did not show any significant changes after a 2-week frozen storage at −20°C.
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