Eel — Food safety facts
Feed with care · Cats · full breakdown on the linked food page
Very high in fat, and raw eel blood is toxic. Cooked plain in tiny amounts only.
Short answer
The first signs of eel poisoning in cats can include vomiting, diarrhea, and lethargy, usually within 1-4 hours after ingestion. The symptoms may last for 1-3 days. If your cat shows these signs, it’s important to contact your vet immediately.