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Characterization, Microbial Community Structure, and Pathogen Occurrence in Two Typical Eel Farms.

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  • 1College of Chemical Engineering, Huaqiao University, Xiamen 361021, China.

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Summary
This summary is machine-generated.

Aquaculture wastewater treatment struggles with nitrogen removal, impacting water quality and public health. Pathogen risks in eel farms require improved management strategies for sustainable aquaculture.

Keywords:
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Area of Science:

  • Environmental Microbiology
  • Aquaculture Science
  • Water Quality Management

Background:

  • Aquaculture systems face risks from pollutants and pathogens, impacting economics and public health.
  • Microbiological contaminants and their environmental links in aquaculture are poorly understood.
  • Existing treatment processes may be insufficient for comprehensive pollutant removal.

Purpose of the Study:

  • To investigate water quality and microbial communities in two Chinese eel farm treatment processes.
  • To identify key pollutants and their correlations with microbial populations.
  • To propose improvements for aquaculture tailwater treatment and pathogen risk mitigation.

Main Methods:

  • Field investigation of two eel farms in southeast China.
  • Analysis of water quality parameters, including total phosphorus, total nitrogen, ammonium, nitrate, and nitrite.
  • Microbial community analysis to assess bacterial abundance and correlations with environmental factors.

Main Results:

  • Flocculant addition effectively reduced total phosphorus but not total nitrogen.
  • High levels of total nitrogen, ammonium, nitrate, and nitrite were observed.
  • Nitrogen functional bacteria abundance was low, with significant correlations between specific nitrogen pollutants and bacterial phyla (Verrucomicrobiota, Nitrospirota, Anaerolineaceae).
  • Pathogens like Lactococcus and Escherichia-Shigella were detected.

Conclusions:

  • Current aquaculture tailwater treatment processes are ineffective for nitrogen removal.
  • Low abundance of nitrogen-fixing bacteria contributes to poor nitrogen removal efficiency.
  • Pathogen presence highlights the need for enhanced treatment and risk management in aquaculture.