Fish disease library

Browse every disease, parasite, and bacterial infection covered in our knowledge base. Pick filters to narrow it down — results update as you go.

17 conditions

Goldfish

Bacterial Diseases in Koi & Goldfish

Bacterial diseases are among the most common and serious health challenges facing koi and goldfish keepers worldwide. Caused…

Moderate To To To Severe

Freshwater Tropical

Mycobacteriosis (Fish Tuberculosis)

A slow, chronic infection caused by Mycobacterium spp. Symptoms include emaciation, spinal deformity, and granulomas. Zoonotic risk —…

Critical

Freshwater Tropical

Dropsy

Bloated body with pinecone-stuck-out scales — a symptom of organ failure, not a disease itself. Prognosis is generally…

Critical

Freshwater Tropical

Cloudy Eye

Hazy or opaque film over one or both eyes — usually a sign of bacterial infection or chronic…

Moderate

Freshwater Tropical

Streptococcosis

Bacterium disease of aquarium fish. Key signs: exophthalmia (often unilateral, 'pop-eye'), corneal opacity, spinning/spiral swimming, darkening, hemorrhages around…

Severe

Freshwater Tropical

Bacterial Cold Water Disease

Bacterium disease of aquarium fish. Key signs: rtfs in fry: spiral swimming, exophthalmia, dark colouration, anaemia, splenomegaly; older…

Moderate

Freshwater Tropical

Edwardsiellosis

Bacterium disease of aquarium fish. Key signs: gas-filled abscesses in muscle ('emphysematous putrefactive' lesions), ascites, exophthalmia, foul odour…

Moderate

Freshwater Tropical

Enteric Redmouth Disease (ERM)

Bacterium disease of aquarium fish. Key signs: subcutaneous hemorrhages around mouth and throat (the 'red mouth'), darkening, exophthalmia,…

Severe

Freshwater Tropical

Bacterial Kidney Disease (BKD)

Bacterium disease of aquarium fish. Key signs: chronic, progressive: granulomatous lesions in kidney (creamy white nodules), spleen, and…

Moderate

Freshwater Tropical

Enteric Septicemia of Catfish (ESC)

Bacterium disease of aquarium fish. Key signs: acute septicaemic: lethargy, head-up vertical floating, petechial hemorrhages on chin and…

Severe

Freshwater Tropical

Infectious Pancreatic Necrosis (IPN)

Virus disease of aquarium fish. Key signs: fry: dark color, exophthalmia, abdominal distension, spiral swimming, white mucoid faecal…

Critical

Freshwater Tropical

Viral Hemorrhagic Septicemia (VHS)

Virus disease of aquarium fish. Key signs: acute: exophthalmia, anaemic gills, hemorrhages on skin and at fin bases,…

Critical

Freshwater Tropical

Tilapia Lake Virus (TiLV) Disease

Virus disease of aquarium fish. Key signs: skin congestion, scale erosion, exophthalmia, abdominal swelling, ocular alterations, behavioural changes;…

Critical

Goldfish

Spring Viremia of Carp (SVC)

Virus disease of aquarium fish. Key signs: lethargy, darkening, exophthalmia, distended abdomen (dropsy), petechial hemorrhages in skin and…

Critical