Trichodina in Freshwater Fish

Also known as the "scrubbing bubbles," trichodinosis is caused by freshwater parasites commonly found on koi and goldfish. Although there are many species, they all have a similar appearance and behavior. They are circular in shape and have multiple teeth that ratchet around, feeding on skin and mucus. Here you can watch them in action: [...]

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Salt in Fish Systems

Salt is a normal component of many fish systems. Saltwater and brackish systems require salt on a continual basis. But what about freshwater systems? Some internet pages recommend keeping salt in koi/goldfish ponds/tanks at all times. Others say don't bother. What are the effects of salt on an all-freshwater species? In a freshwater environment, a [...]