Dictionary of Ichthyology  

hypertrophy = the over-development of a structure, e.g. the lips in some cyprinid fishes, the finfolds in the larval myctophid Loweina rara used in nutrient absorption

Barbus nedgia from Boulenger's "Fishes of the Nile". Photograph by Brian W. Coad.

Canadian Museum of Nature
 www.briancoad.com