Fish: quality management of seafood - Spoilage and quality analysis

6 important questions on Fish: quality management of seafood - Spoilage and quality analysis

What entails rigor mortis in fish?

  • Rigor mortis
    • depending on: species, temp, nutrition, handling
    • when handled badly: gaping, drip loss, toughness, discoloration
    • should be frozen after rigor mortis

What is autolysis and by what is it influenced?

Autolysis is the enzymatic breakdown of fish (self-digestion), affected by feeding, processing and temperature

after abuse of the fish: belly burst and rapid bacteria growth

By what is bacterial spoilage influenced?

Bacterial spoilage is influenced by temperature, handling and processing
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What is rancidity of fish? And what happens when the fish was abused?

Fat oxidation -> unpleasant odor and taste
affected by: temp, O2, light, metals
when fish was abused?  -> odor, yellow/brown discoloration, inedible
solution:  exclusion of oxidants by antioxidants

When do changes in protein take place?

With lean fish, affected by fluctuating temperature and high freezing temperature
when abused (storage at 30 degrees) -> spongy, rubbery, though meat

How to handle fish well? (good handled fish)

Good care and low temperatures
work with clean/pure processing water
use high hygiene standards

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