So, fewer cod and an explosion of zooplankton-eating sprats means more algae and less oxygen.

所以，鳕鱼数量减少，就造成了西鲱鱼增多，相应的就会消耗掉浮游动物，于是海藻增多，氧气减少。

Cod eat sprats, a small, herring-like species that eat microscopic marine creatures called zooplankton that in turn eat the algae.

鳕鱼吃西鲱鱼，西鲱鱼吃浮游动物，而浮游动物又以藻类为食。