Studies on the types,distribution and secretion of mucous cells in the skin and gill of Silurus asotus

Abstract:

The types,distribution and secretion of mucous cells stained with AB-PAS (pH AB = 2.6) in the skin and gill of Silurus asotus (body length 35 ± 10 cm,body weight 650 ± 150 g) were studied.The results showed that the mucous cells in the skin and gill of Silurus asotus could be classified into five types according to colorization with AB-PAS,the shape of the cells and distribution position,i.e.Type Ⅰ,Type Ⅱ,Type Ⅲ,Type Ⅳ and Type Ⅴ mucous cells;In the skin,there were types Ⅰand Ⅲ mucous cells,and in the gill,there were types Ⅰ,Ⅱ,Ⅲ and Ⅴ mucous cells;The density of mucous cells was the highest in the ventral skin,and the mean density was about 1 083 cells /mm₂.Next is in the sbmaxillary skin,and the mean density was about 802 cells /mm₂.The density of mucous cells was the lowest in the gill filament,and the mean density was about 208 cells /mm₂;The mucous cells had 4 kinds of secretion,the type Ⅰmucous cells had holocrine secretion,the type Ⅱ mucous cells had partial secretion,the type Ⅲ mucous had macroapocrine secretion,the type Ⅳ mucous cells had apocrine secretion.