Deformities are usually skin tumours or parasites in the skin or muscular tissue.
They can also be caused by a disease or as a result of natural defects or inbreeding.
158 . Paracheirodon axelrodi ?Cardinal? - Deformity: Cardinal Tetra (wild-caught) with deformed spine.
159 . Kryptopterus minor bicirrhis - Deformity: Glasscatfish with deformed spine. 
160 . Corydoras paleatus ?albino high fin? - Deformity: Corydoras with deformed spine. 
161 . Xiphophorus variatus ?Platy? - Deformity: Platy with hunchback caused by Bacterial (FishMB) infection.
162 . Microgeophagus ramirezi - Deformity: Dwarf Cichlid with deformed mouth caused by inbreeding. 
163 . Microgeophagus ramirezi - Deformity: Dwarf Cichlid with swelling underneath the eye (and also pop-eye) caused by FishMB.
164 . Neolamprologus sp. - Deformity: Tanganyika Cichlid with swollen thyroid gland causing an extended throat. (Photo W.Van der Elst)
165 . Pterophyllum scalare - Deformity: Angelfish with missing gill cover (congenital deformity) with damaged (white necrotic) gills.
166 . Pterophyllum scalare - Deformity: Angelfish with tumour at the upperlip. 
167 . Carassius ?Oranda? - Deformity: Oranda Fantail with tumour on the body. 
168 . Barbus tetrazona - Deformity: Barb with tumour on the head and the eye. 
169 . Aulonocarra nyassae - Deformity: Malawi Cichlid (wild-caught) with swelling on base of tail caused by Sporozoa infection.
170 . Hemigrammus bleheri - Deformity: Rummynose with a large, protruding swelling on its body caused by a worm (Nematode).
171 . Pangasius sutchi - Deformity: Iridescent Shark with large bubbles on the skin caused by parasitic Sporozoa Plasmodia. 
172 . Lebistes reticulatus ?Guppy? - Deformity: Guppy consisting of 2 fish: a large fish with a small fish attached to its belly = Siamese Twin.