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Study suggests ion generators could be harmful to fish
Scientists found the ion generators can produce high concentrations of copper and zinc that are harmful to fish.
Researchers conclude generators produce toxic levels of copper and zinc.

Copper ion generators used to control algae growth in freshwater ponds generate high concentrations of metals that could be harmful to fish, according to new research.

The study, published in Vet Record, concludes that ion generators might not be safe for fish and that copper should only be used to prevent algae growth if concentrations are monitored closely.

In the study, researchers carried out physical and postmortem examinations on two koi fish that had died in a pond fitted with a copper ion generator (Aquascape IonGen). They concluded that heavy metal toxicity was the likely cause of morbidity and mortality, which was supported by a heavy metal screening of the owners’ pond.

The team also carried out tests to see whether the IonGen produced toxic levels of copper and zinc. They found that the tank containing the IonGen had higher concentrations of copper and zinc, and copper levels exceeded those associated with toxicity in both hard and soft water.

The researchers conclude: 'Cu ion generators such as the IonGen can produce Cu concentrations that have detrimental effects on the health of koi. Although both Cu and Zn toxicities are dependent on water hardness and other geochemical parameters, the experiment suggests that the IonGen has the capacity to produce Cu at levels that are toxic regardless of water hardness.'

They continue: 'Cu ion generators should not be used in freshwater ponds that contain live plants and animals due to the risk of chronic and unpredictable Cu exposure, and veterinarians should consider Cu ion generators as potential sources for Cu toxicity in freshwater fish, especially in ponds with soft water.'

The study was conducted by researchers at the North Carolina State University College of Veterinary Medicine and the University of Pennsylvania School of Veterinary Medicine.

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Practices urged to audit neutering data

News Story 1
 RCVS Knowledge has called on vet practices to audit their post-operative neutering outcomes.

It follows the release of the 2024 NASAN benchmarking report, which collates data from neutering procedures performed on dogs, cats and rabbits.

The benchmarking report enables practices in the UK and Ireland to compare their post-operative outcomes to the national average. This includes the rate of patients lost to follow-up, which in 2024 increased to 23 per cent.

Anyone from the practice can submit the data using a free template. The deadline for next report is February 2026.

Visit the RCVS Knowledge website to complete an audit. 

Click here for more...
News Shorts
UK's BSE risk status downgraded

The WOAH has downgraded the UK's international risk status for BSE to 'negligible'.

Defra says that the UK's improved risk status recognises the reputation for having the highest standards for biosecurity. It adds that it demonstrates decades of rigorous animal control.

Outbreaks of Bovine Spongiform Encephalopathy, also known as mad cow disease, have previously resulted in bans on Britain's beef exports.

The UK's new status could lead to expanded trade and better confidence in British beef.

Christine Middlemiss, the UK's chief veterinary officer, said: "WOAH's recognition of the UK as negligible risk for BSE is a significant milestone and is a testament to the UK's strong biosecurity measures and the hard work and vigilance of farmers and livestock keepers across the country who have all played their part in managing the spread of this disease.