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Raw fish
Raw fish
Raw fish is not acutely toxic to cats, but it carries significant health risks that make it inappropriate as a regular food. Many raw fish species contain thiaminase — an enzyme that destroys thiamine (vitamin B1) — and all raw fish poses bacterial and parasitic contamination risks.
Important Notes
Thiaminase risk: raw freshwater fish and many saltwater species (tuna, carp, herring) contain thiaminase, which destroys thiamine (B1); regular feeding causes neurological damage — weakness, seizures, head tilt, coma
Bacterial risk: Salmonella, Listeria, and other pathogens in raw fish can cause vomiting, diarrhea, and sepsis
Parasitic risk: raw fish may contain anisakis worms or other parasites that harm the GI tract
Cooked fish (plain, boneless): safe in small amounts; cooking destroys thiaminase and kills pathogens
Bones: raw fish bones can splinter and cause oral or GI injury; always remove bones before offering
Potentially Toxic Parts
Raw form
Flesh
Skin
Possible Symptoms Reported in Cats
Severe Neurological Dysfunction (Ataxia, Seizures, and Ventriflexion)
Neurological · Chronic/Delayed (typically develops within 2 to 4 weeks of a raw fish-heavy diet).
Cardiac Arrhythmias
Cardiac · Late-stage / End-stage of thiamine deficiency.
Gastrointestinal Upset (Vomiting, Diarrhea, and Anorexia)
Gastrointestinal · Variable. Can be acute (within hours to a few days) if caused by foodborne pathogens,
Ocular / Visual Impairment
Neurological · 2 to 4 weeks (manifests rapidly once the thiamine deficiency encephalopathy sets in).
Steatitis (Yellow Fat Disease)
Dermal · Chronic (develops over time from an unbalanced diet).
Based on the sources and our conversation history
Metabolic
Disclaimer: This summary was compiled from multiple sources and is for informational use only. It is not a diagnosis or treatment plan. Toxicity can vary based on the substance, amount, plant part, and individual cat. If you think your cat may have been exposed to a toxic substance, contact a veterinarian right away.