A Histological Observation of Nodular Growth on the Head Skin of

Journal of The School of Marine Science and Technology,Vol.4 No.2

A Histological Observation of Nodular Growth on the Head Skin of Japanese Lion-head Goldfish

Nobuhiro SUZUKI and Masahiro TANITSU

	Abstract

	Japanese lion-head goldfish,known as a Rantyu in Japan,is characterized by exhibiting papilliform growth on cranial, infraorbital and opercular of head regions. A histological character in the papilliform growth is observed. The epithelial layer is made up of papillate growth toward the dermal layer. The dermal layer is composed of extensive collagen fibers. The histological character of head skin of Japanese lion-head goldfish is not skin tumor but epithelial and dermal nodular growth.The frequency of nodular growth is accompanied by growth of individuals.