Describe the excretory system of the genus Nereis briefly.

简述沙蚕属的排泄系统。

Products: lobworm, blach shell, dried fish etc.

沙蚕、、干。

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

通过营养价,表明沙蚕白虾来说是一种高蛋白、低脂肪的优质饲料。