A morphological and histochemical study on gill primary lamellae of the teleost, Seriola quinqueradiata, exposed to sea bloom.

Abstract

The effects of sea bloom on gill primary lamellae of the teleost, young yellowtail (Seriola quinqueradiata) were investigated from the morphological and histochemical point of view. Mucous goblet cells located on the afferent ridge were significantly impaired by the sea bloom (Gymnodinium), while they were intact on the efferent ridge. Most of the mucous cells epxosed to the sea bloom disappeared from the afferent ridge, and a few rudimental cells remained. Histochemically, these mucous cells contained neutral glycoproteins. Electronmicroscopically, the surface of the afferent ridge exposed to sea bloom was covered entirely with the pavement cells. These observations may have relevance to the manner in which the toxic effects of sea bloom on the teleost are mediated.