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[Microbial silage production from eviscerated fish]

R Bello1, E Cardillo, R Martínez

  • 1Instituto de Ciencia y Tecnología de Alimentos, Facultad de Ciencias, Universidad Central de Venezuela.

Archivos Latinoamericanos De Nutricion
|September 1, 1993
PubMed
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This study developed microbial fish silage from shrimp by-catch, using Lactobacillus plantarum. The resulting silage showed reduced microbial load and stable nutritional value, making it a safe product.

Area of Science:

  • Aquaculture and Marine Biology
  • Food Science and Technology
  • Microbiology

Background:

  • Shrimp by-catch represents a significant underutilized resource in fisheries.
  • Developing value-added products from fish by-catch can improve economic viability and reduce waste.
  • Microbial silage is a promising method for preserving fish by-products.

Purpose of the Study:

  • To produce and evaluate microbial fish silage from mixed shrimp by-catch species.
  • To assess the biochemical, microbial, and toxicological changes during silage production and storage.
  • To determine the suitability of the silage as a potential feed ingredient.

Main Methods:

  • Fish silage was prepared using shrimp by-catch, molasses, pineapple, papaya, sorbate, and Lactobacillus plantarum ATCC8014.

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  • Process parameters monitored included pH, acidity, consistency, exudate, non-protein nitrogen, and total volatile bases.
  • Microbial counts (aerobic mesophilic, psychrotrophic, Pseudomonas, coliform, S. aureus, Bacillus spores) and toxicological analyses (lead, mercury, chrome) were performed.

    • Main Results:

    • Rapid pH reduction and acid production occurred within the first two days, stabilizing thereafter.
    • Significant hydrolysis and liquefaction were observed in the initial 8 days of processing.
    • The final silage exhibited a substantial reduction in harmful microbial load, with only Bacillus spores detected after dehydration.
    • Toxicological tests revealed low levels of heavy metals in the dry silage, and proximate analysis remained stable throughout.

    Conclusions:

    • Microbial silage production using Lactobacillus plantarum is effective in preserving shrimp by-catch.
    • The process significantly reduces microbial contamination, rendering the silage safe for potential use.
    • Dehydrated fish silage offers a stable and potentially valuable product from fishery waste.