Post-mortem degradation of the muscle tissue in diploid and triploid turbots (Scophthalmus maximus L.)
Ayala Florenciano, M. D. | Cal, R. | Hernández-Urcera, J. | Blanco, A. | López-Albors, O.
Structural and ultrastructural muscle changes were studied throughout post-mortem degradation in diploid (2N) and triploid (3N) 22-month-old turbots (Scophthalmus maximus L.). Textural changes were also studied. Muscle degradation was fast in 2N and 3N turbot, as indicated by detachment of myofibrils from the sarcolemma and swollen organelles from day one post-mortem onwards. Interfibrillar and intermyofibrillar spaces, disruptions in sarcolemma-endomysium and autophagic vacuoles increased after 3 days in both fish groups. The percentage of interfibrillar detachments increased from 3 to 7 days in 2N and 3N, remaining constant until 14 days post-mortem, whereas the autophagic processes were more marked after 7 days. Post-mortem muscle alterations were stronger in the triploid group. Thus, the autophagic mechanisms and the percentage of interfibrillar detachments were higher in triploid than in diploid turbot. Hardness was not affected by ploidy or post-mortem stages.
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