Fisheries Science

, Volume 74, Issue 5, pp 1075–1082

Influence of certain soybean antinutritional factors supplemented to a casein-based semipurified diet on intestinal and liver morphology in fingerling rainbow trout Oncorhynchus mykiss

  • Yasuro Iwashita
  • Takeshi Yamamoto
  • Hirofumi Furuita
  • Tsuyoshi Sugita
  • Nobuhiro Suzuki
Article

DOI: 10.1111/j.1444-2906.2008.01627.x

Cite this article as:
Iwashita, Y., Yamamoto, T., Furuita, H. et al. Fish Sci (2008) 74: 1075. doi:10.1111/j.1444-2906.2008.01627.x

Abstract

To investigate the cause of morphological changes occurring in the liver and intestine of rainbow trout Oncorhynchus mykiss fed defatted soybean meal (SBM)-based non-fish meal diets, morphological observations were conducted on fish fed casein-based semipurified diets supplemented with soybean antinutritional factors (soya saponin, soya isoflavone, soya lectin, oligosaccharide, Ca-phytate and their mixture). Hepatocytes and the epithelial cells in the hepatic ducts were not atrophied in any of the treatments. Lack of microvilli and pinocytotic vacuoles, and fatty degeneration of the epithelial cells were observed in the distal intestine of fish fed diets containing soya saponin. The proliferation of connective tissue in the mucosal folds and submucosa was shown in the distal intestine of fish fed the diet containing all substances including lectin. These results suggest that both saponin and lectin are the responsible factors in SBM for the occurrence of morphological changes of the distal intestine in rainbow trout fed SBM-based diets.

Key Words

antinutritional factor intestine lectin morphology Oncorhynchus mykiss saponin soybean meal 

Copyright information

© The Japanese Society of Fisheries Science 2008

Authors and Affiliations

  • Yasuro Iwashita
    • 1
  • Takeshi Yamamoto
    • 2
  • Hirofumi Furuita
    • 2
  • Tsuyoshi Sugita
    • 2
  • Nobuhiro Suzuki
    • 1
  1. 1.Department of fisheries, Graduate School of Marine Science and TechnologyTokai UniversityShimizu, ShizuokaJapan
  2. 2.Feed Research Group, Inland Station, National Research Institute of AquacultureFisheries Research AgencyTamaki, MieJapan

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