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Changes in some chemical and rheological parameters and in the indices of rigor in the muscle of rainbow trout and sea bass in the 24-hour postmortem period.

Evolution de certains paramètres chimiques et rhéologiques et de la rigidité dans le muscle de truite arc-en-ciel (Oncorhynchus mykiss) et de bar (Dicentrarchus labrax) pendant les 24 heures suivant l'abattage.

Author(s) : PARISI G., GERI G., LUPI P., MECATTI M., GUIDOTTI P., FRANCI O.

Summary

Variations in L-lactate, in pH, in the degree of isometric muscle tension and in the indices for rigor, compactness and resilience were studied in the 24-h postmortem period to study rigor mortis development at the initial stages in rainbow trout and sea bass. Also assessed were the effects of two modes of antemortem treatments, non stressed and stressed. Trout and sea bass of marketable size were stored under ice at 4 deg C after slaughter for the duration of the study. There were significant differences between both species and types of treatments. Bass attained peak isometric contraction earlier, and had lower levels of glucose and glycogen upon slaughter, as well as lower levels of L-lactate in the 24-h postmortem period, than rainbow trout. Fish exposed to stressed treatment contracted earlier, with lower muscle tension values and lower glycogen levels upon slaughter, than non stressed-type fish. The effect of ante mortem treatment was most noticeable in bass.

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Details

  • Original title: Evolution de certains paramètres chimiques et rhéologiques et de la rigidité dans le muscle de truite arc-en-ciel (Oncorhynchus mykiss) et de bar (Dicentrarchus labrax) pendant les 24 heures suivant l'abattage.
  • Record ID : 1997-0963
  • Languages: French
  • Source: Refrigeration and Aquaculture.
  • Publication date: 1996/03/20
  • Document available for consultation in the library of the IIR headquarters only.

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