Abstract
We made a comparative study on changes of ultrastructure and cytochemical Mg2+-adenosine triphosphatase (Mg2+-ATPase) in ordinary muscle of cultured and wild red sea bream during storage in ice.Degeneration of the Z lines of ordinary muscle was faster in cultured fish than in wild fish. In cultured fish, the structure of the Z lines became discontinuous within 1 day in ice. While, the Z lines showed continuity until day 3 in wild fish. Degenerations of other organella, such as the sarcoplasmic reticulum, mitochondria, A band, and I band were similar in both cultured and wild fish.Mg2+-ATPase activity was found at the sarcoplasmic reticulum, near both ends of A band, mitochondria, and nuclear membrane in both fish immediatedly after death. Mg2+-ATPase activity in these organella became undetectable on day 5 in cultured fish, but it was still weakly detected on day 7 in wild fish.These results suggested that ultrastructure and cytochemical Mg2+-ATPase activity are good indicators for post-mortem changes in fish muscle.
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