Fish Diseases

Masthead
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Fish with signs of columnaris
Title
Fish Diseases
Subtitle
Infections and Parasites
Cards
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Fish with signs of columnaris
Body

The affected skin may have pale patches and/or a characteristic sore or lesion shaped like a saddle across the dorsal fin.

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flukes
Title
Body

Fluke larvae burrow into the flesh of the fish and form a cyst.

Body

Melanosis is not an infection but an increase in the melanin in the skin.

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Fish roundworms in body cavity of a fish
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Red, off-white, and white worms found under the skin, in the intestines, and in the body cavity.

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Sandy flesh shown in two filets
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Body

The diseased flesh appears tough, granular, coarse, and yellow to brown, often resembling freezer-burned meat.

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Tapeworm larvae in fish cavity
Body

Tapeworm larvae (plerocercoids) often appear as white cysts or coiled worms in the flesh or internal organs.

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Ulcers on the skin of a fish
Title
Body

The most common causes are three bacteria in the genus Aeromonas.

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Numerous warts on the skin of a fish
Title
Body

Fish have wartlike growths on the skin, fins, and occasionally gills.

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Water mold on skin of a catfish
Title
Body

Water molds (which are not true molds or fungi) appear as white, gray, or tan cottony growths on the skin of the fish when submerged in water.