The effect of digested sludge on the common carp, cyprinus carpio L.

Ming Hung WONG, K. C. LUK, W. K. LIU, S. H. KWAN

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The effects of sewage sludge on the survival of the common carp. Cyprinus carpio. were investigated. It was noted that, when the concentrations of the sludge used for rearing carp exceeded 0.6%. the fish died within 42 days, whereas those reared in 0.2% sludge remained alive and healthy during the trial period. 

The body and the gills of the dead fish were covered by a veil-like film which looked like coagulated mucus and was formed by the heavy metal ions from the sludge reacting with some constituents of the mucus secreted by the gill. 

The histopathological symptoms of the various organs further demonstrated that internal injury in liver and kidney was also an important feature of the intoxicants as well as external damage, especially the particles observed around the gills. 

It was concluded that the optimum concentration of sludge to any species of fish should be determined by testing a series of concentrations before using it as a supplementary fish feed or fish pond fertilizer. Copyright © 1979 S. Karger AG, Basel.

Original languageEnglish
Pages (from-to)130-133
JournalCells Tissues Organs
Issue number2
Publication statusPublished - 1979


Heavy Ions
Heavy Metals
Wounds and Injuries


Wong, M. H., Luk, K. C., Liu, W. K., & Kwan, S. H. (1979). The effect of digested sludge on the common carp, cyprinus carpio L. Cells Tissues Organs, 103(2), 130-133. doi: 10.1159/000145003


  • Survivalship
  • Histopathology
  • Gill
  • Liver
  • Kidney
  • Intestine