Dr. Gerald Bassleer's New Illustrated Guide to Fish Diseases – 3rd Edition

Know what's wrong with your fish — before it's too late.

When a fish shows spots, frayed fins, or odd behavior, the clock is ticking and guesswork costs lives. Most hobbyists are left scrolling forums, hoping someone's symptoms match.

This is the reference written by the man the food is named after. Dr. Gerald Bassleer has spent 40+ years in fish-health management, and his newly updated third edition is a comprehensive, richly illustrated diagnostic guide covering tropical, freshwater, and pond fish — used by hobbyists, breeders, and professionals alike.

1. Match what you're seeing to the illustrated symptoms.
2. Identify the likely cause with confidence.
3. Act early, with the right treatment.

Keep the definitive guide on your shelf. Add to cart.

Few names carry more authority in this field than Dr. Gerald Bassleer. With more than 40 years dedicated to fish-health management — the same expertise behind the Dr. Bassleer functional food range — he has distilled decades of hands-on diagnostic experience into a reference trusted across the aquarium world.

What's Inside

A comprehensive, richly illustrated diagnostic guide to the diseases of tropical, freshwater, and pond fish. Detailed photographs and illustrations let you match visible symptoms — spots, frayed fins, discoloration, and abnormal behavior — to their likely causes, so you can identify a problem with confidence and act early with the right treatment. This newly updated third edition brings the guidance in line with current fish-health practice.

Who It's For

Hobbyists, breeders, and aquarium professionals who need to diagnose sick fish quickly and accurately — from the keeper facing their first outbreak to the experienced fishkeeper who wants a definitive reference on the shelf.

FAQ

What's new in this edition? This is the newly updated third edition, revised and expanded to reflect current fish-health knowledge.

Is it suitable for beginners? Yes — the illustrated, symptom-first approach makes it approachable for hobbyists while remaining detailed enough for breeders and professionals.

Which fish does it cover? It covers tropical, freshwater, and pond fish diseases.