Describe the excretory system of the genus Nereis briefly.

简述沙属的排泄系统。

Products: lobworm, blach shell, dried fish etc.

沙、禾、。

Nereis is a high-protein,low-fat and high-quality Penaeus vannamei feed through nutrition assessment.

通过营养价,表明沙美白虾来说是一种高蛋白、低脂肪的优质饲料。