The use of enzyme-digested soybean residue for feeding common carp.

Ming Hung WONG*, L. Y. Tang, F. S. Kwok

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

27 Citations (Scopus)


This experiment was an attempt to use the soybean residue derived from the production of "soy milk". The residue contains about 18% protein, 70% carbohydrates and 7.5% lipid as fish feed for rearing common carp, Cyprinus carpio. There were 4 types of diets: (1) soybean residue, (2) soybean residue digested with Papain, (3) soybean residue (64%) mixed with beef liver (34%) and (4) same mixture as (3) but digested with Papain. The results indicate that the percentage increase in weight and length of fish feeding with beef liver supplemented diets was higher than those feeding with soybean residue alone. This was possibly due to the fact that beef liver was able to supplement the nutrient deficiency in soybean. The two types of feeds (2 and 4) digested with Papain also yielded significantly better fish growth in terms of weight and length gains, than their counterparts without digestion. Furthermore, the water turbidity of the tanks added with digested feeds was significantly less, as Papain was able to hyrolyse the protein substrates suspended in the water, and thus lowered the turbidity.

Original languageEnglish
Pages (from-to)418-423
Number of pages6
JournalBiomedical and Environmental Sciences
Issue number4
Publication statusPublished - Dec 1996

Scopus Subject Areas

  • Public Health, Environmental and Occupational Health
  • Health, Toxicology and Mutagenesis


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