branchial filament

The branchial filament clearly widen and whose holes become smaller and closely arranged.

鳃丝明显变宽,其两侧的鳃孔也变小,排列更紧密.

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so there is a significant difference in thickness of the lamina and lamella, and width of the branchial filament in inner and outer gill.

由于这种结构的存在，使得内外鳃瓣在鳃瓣厚度、鳃小瓣厚度、鳃丝宽度上存在显著性差异。

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The microstructure of gill was destroyed when exposed to dimethoate and triazophos. Symptoms included the shortening of branchial filament, hyperplasia of inter-filamentary junction and the basal membrane connective tissues, and the jam of water tube and blood tube.

乐果和三唑磷对缢蛏鳃显微结构的影响是：鳃丝变短，鳃丝间隔和基底膜结缔组织增生，鳃孔、血管腔堵塞；

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