dark

Dark patches and lumps.

Myxobolus squamalis
Red spots on belly of rainbow trout caused by the myxozoan parasite Myxobolus squamalis
Infectious Hematopoi...
Hemorrhaged swim bladder caused by IHN virus
Neascus
Unpigmented Neascus metacercaria.
Tumor-like lumps
Tumors on lips of adult spring Chinook salmon.
Neascus
Fish infected with Neascus (spots).
Bacteria
Bacterial lesion on side of trout.
Glochidia (parasitic...
Larval mollusc (glochidium) on gills.
Trematodes (flukes...
Black spots on fin are trematode metacercaria.
Neascus
Black spots on fin are Neascus.
Neascus
Comparison of normal fish (top) and fish infected with Neascus (bottom - spots).
Nanophyetus
Nanophyetus metacercaria (black spots) on ventral surface of fish.
Trematodes (flukes...
Trematode metacercaria in gills.
Salmincola
Salmincola adults on gills of trout.
Copepods
Adult sea lice on fish skin.
Myxobolus squamalis
Skin of fish showing several puckered scales, resulting from development of Myxobolus squamalis cysts in the scale pockets.