oxygenator

Noun

any device that releases oxygen (or air) into water, especially one in an aquarium

Japanese Meaning

水槽や水域に酸素または空気を供給する装置 / 酸素添加装置 / 酸素供給装置

I installed a small oxygenator in the aquarium to keep the fish healthy during the summer heat.

夏の暑さの間、魚を健康に保つために水槽に小さなエアーポンプを設置しました。

Sense（1）

any device that releases oxygen (or air) into water, especially one in an aquarium

oxygenators

（ plural ）