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Fish Health Guide

5 conditions • Expert-reviewed information

Temperature

Species-dependent (tropical: 68-82°F/20-28°C)

Heart Rate

Species-dependent

Respiratory Rate

Species-dependent

Conditions by Body System

cardiovascular System

Dropsy in Fish

Not a disease itself but a symptom of underlying organ failure (usually kidneys). The fish's body swells and scales stand out like a pinecone. By the time dropsy is visible, the underlying disease is often advanced.

Severe

skin coat System

Columnaris (Cotton Mouth Disease) in Fish

A highly contagious bacterial infection caused by Flavobacterium columnare. Often confused with fungal infections due to its cotton-like appearance. Can kill fish within 24-48 hours in acute cases.

Moderate

Ich (White Spot Disease) in Fish

The most common parasitic disease of aquarium fish, caused by Ichthyophthirius multifiliis (freshwater) or Cryptocaryon irritans (saltwater). Characterized by tiny white spots on the body and fins. Highly contagious and potentially fatal.

Moderate

Fin Rot in Fish

A common bacterial infection causing progressive erosion of the fins. Often a secondary consequence of poor water quality or stress. Can progress from the fin edges to the body (body rot) if untreated.

Mild

musculoskeletal System

Swim Bladder Disorder in Fish

A condition affecting buoyancy control. Fish may float uncontrollably, sink to the bottom, or swim at odd angles. Most common in fancy goldfish and bettas. Can be temporary or chronic.

Mild

Fish Health Tips

Annual Check-ups

Schedule yearly veterinary exams including blood work for fishs over 7 years old. Early detection saves lives.

Dental Care

Dental disease affects 80% of fishs by age 3. Brush teeth regularly and schedule professional cleanings.

Weight Management

Obesity shortens lifespan and predisposes to arthritis, diabetes, and other conditions. Use a body condition score to monitor.

Parasite Prevention

Keep up with flea, tick, and heartworm prevention year-round — not just in summer.

Know the Emergencies

Learn the signs of common fish emergencies: bloat (dogs), urinary blockage (cats), poisoning, and severe trauma.

Nutrition

Feed a high-quality diet appropriate for life stage. Consult your vet before making major diet changes.