noun
sea fishing; saltwater fishing
Refers to fishing in the sea, as opposed to rivers or lakes. A straightforward compound noun.
週末に友達と海釣りに行く予定です。
I plan to go sea fishing with a friend this weekend.
海釣りは川釣りより道具が大きい。
Sea fishing requires larger gear than river fishing.
Compound of 海 (umi, 'sea') and 釣り (tsuri, 'fishing'), with rendaku voicing of つ to づ.