New Insights into Chitin Metabolism in Fish

Strategic Insights -

Research from the Norwegian University of Life Sciences has provided new insights into the metabolism of chitin in fish. The study, published in the journal Aquaculture and Fisheries, investigated the effects of dietary chitin on Atlantic salmon chitinase activity, gene expression, and microbial composition. The findings suggest that chitin is metabolized in fish, and the expression and activity of Atlantic salmon chitinases are not affected by dietary chitin. However, the study did reveal an association between gut microbial composition, chitinase activity in the gut, and host chitinase expression.

Key Takeaways:

  • The study demonstrated that chitin is a common component in the natural diet of many fish, including Atlantic salmon.
  • Atlantic salmon express multiple genes associated with chitin metabolism, suggesting that they have a complex mechanism for breaking down chitin.
  • The expression and activity of Atlantic salmon chitinases were not affected by the addition of dietary chitin, indicating that chitin is not a critical source of chitinase activity in fish.
  • However, the study found an association between gut microbial composition, chitinase activity in the gut, and host chitinase expression, suggesting that the gut microbiome plays a role in the regulation of chitin metabolism in fish.
  • The research highlights the importance of understanding chitin metabolism in fish, particularly in the context of aquaculture, where chitin is a common component of fish feed.

Statistics:

  • The study involved the use of chitinase activity assays, transcriptomics, and 16S rRNA bacterial analysis to assess the effect of chitin supplementation on Atlantic salmon gene expression and microbial community composition.
  • The research was conducted by a team of researchers from the Norwegian University of Life Sciences, including Matilde Mengkrog Holen, Simen Rod Sandve, Thomas Nelson Harvey, Yang Jin, Inga Leena Angell, Knut Rudi, and Matthew Peter Kent.
  • The study was published in the journal Aquaculture and Fisheries, volume 10, issue 5, pages 796-803.
  • The research was funded by the Centre for Integrative Genetics (CIGENE) at the Norwegian University of Life Sciences.

Sources:

  • Norwegian University of Life Sciences. The effect of dietary chitin on Atlantic salmon (Salmo salar) chitinase activity, gene expression, and microbial composition. Aquaculture and Fisheries, 2025,10(5):796-803.
  • Life Science Weekly. Norwegian University of Life Sciences Researchers Illuminate Research in Aquaculture [The effect of dietary chitin on Atlantic salmon (Salmo salar) chitinase activity, gene expression, and microbial composition]. September 9, 2025; p 2796.