bottom mud meaning in English

底层泥浆
底泥

A spokesman for afcd said , " fish faeces or unconsumed feed from fish culture activities can lead to an increase in water turbidity . in some cases these organic matters accumulate in the bottom mud , increasing the possibility of bottom oxygen depletion
渔护署发言人说：养鱼活动所产生的鱼粪或流失饲料会使海水变得浑浊，有些情况下这些有机物积聚在鱼类养殖区海床的底泥，增加海底缺氧的可能性。
[ method ] the screening method of strains : preliminarily isolation : chitinase producing strains are screened by the method of transparent zones and use selective medium . the s oil samples ( cotton field soil , rice field soil , tangerine garden soil , pond bottom mud , aquacult ure mud , etc . )
方法菌种筛选方法：初步分离：采用平板透明圈方法筛选几丁质酶产生菌菌株，中文摘要产生透明圈的培养基选用分离培养基。将土样（棉用土