Ventilation of seawater during bleeding suppresses the occurrence of burnt meat in yellowtail Seriola quinqueradiata

Abstract

Fifteen farmed yellowtail Seriola quinqueradiata were randomly selected from sea cages. Five fish were slaughtered instantly by cutting the spinal bulb (control group). The remaining ten fish were left for 20 min in a narrow net and then they were slaughtered by cutting the spinal bulb instantly. These ten fish were bled in two water tanks. In one tank, the water was aerated (ventilation group), while the other tank was not aerated (burnt group). The ATP ratio in the control group (83.8 ± 4.1%) was higher than the ventilation group (37.2 ± 22.1%) and the burnt group (5.8 ± 6.0%) at 3 h after slaughter. The K value of the burnt group increased remarkably at 3 h after slaughter, and was significantly higher than those for the other groups. The ventilation group showed a recovery in available energy for physiological maintenance to the same level as the control group during bleeding, as well as a significantly slowed loss of muscular firmness compared to the burnt group. This study shows that the yellowtail continued to respire and take up oxygen until complete physiological death, and elevated oxygen levels during bleeding slowed the postmortem changes and suppressed the occurrence of burnt meat.

Influência de diferentes métodos de insensibilização pré-abate sobre parâmetros físicos, químicos e sensoriais da carne refrigerada e congelada de bijupirá (Rachycentron canadum)

“…Resultados similares foram encontrados por Knowles et al, (2008) comparando O ATP e os seus metabolitos têm sido usados como indicadores de frescor em diversas espécies; no entanto, os valores dos padrões de nucleotídeos do seu catabolismo podem variar, de espécie para espécie de acordo com relatos de diversos autores (KUDA et al, 2007;MASSA et al, 2005;SHIOYA;TAKEMURA;YAMAGUCHI, 2011). No presente estudo os valores iniciais de ATP foram de 4,90 μMol/g para narcose por CO 2 e 3,57 μMol/g para eletronarcose, similares aos encontrados por Tuckey, Forster;…”