reddish

Fungi and fungus-lik...
Fungal lesion on largescale sucker
Fungi and fungus-lik...
Fungal lesion on largescale sucker
Myxobolus squamalis
Red spots on belly of rainbow trout caused by the myxozoan parasite Myxobolus squamalis
non-pathogen injury...
Ceratonova shasta
Fish liver showing dark red lesions due to C. shasta infection.
Ceratonova shasta
Fish intestine showing swelling and pale lesions due to C. shasta infection
Infectious Hematopoi...
Hemorrhaged swim bladder caused by IHN virus
Aeromonas salmonicid...
Red patches caused by Aeromonas infection.
Copepods
Sealice and feeding scars on skin of trout.
Copepods
Sealice and feeding scars on skin of salmon.
Tumor-like lumps
Tumors on lips of adult spring Chinook salmon.
Bacteria
Bacterial lesion on side of trout.
Strawberry disease
Red patches known as "strawberry disease".
Aeromonas salmonicid...
Red patches (furunculosis) caused by Aeromonas infection.
Bacteria
Bacterial lesion on tail of carp.
Bacteria
Large carp with lesion on tail.
Bacteria
Goldfish displaying red patch on face due to bacterial infection.
Bacteria
Goldfish displaying red patch on face due to bacterial infection.
Ceratonova shasta
Fish liver showing areas of necrosis and damage due to systemic Ceratomyxa shasta infection.