noun
marine ranch; marifarm
A facility or area where marine organisms are raised and harvested, analogous to a livestock ranch on land.
この地域では海洋牧場で魚を育てている。
In this region, they raise fish at a marine ranch.
養殖場 is a general aquaculture farm, while 海洋牧場 specifically refers to a ranch-like operation in the open sea.
Compound of 海洋 (ocean) and 牧場 (ranch, pasture). The term is a modern coinage for marine ranching.