
You went looking for Tiger Prawn and got a wall of conflicting advice — half of it about real-world prawning, tides, and traps that have nothing to do with the game. In Harvest Moon: One World the answer is narrow and fixed: Tiger Prawn is a Sea catch, it bites between 3:00 PM and 11:00 PM, and it wants Level 2 bait. Get those three right and the rest is routing.
3:00 PM–11:00 PM.Stand on the Halo Halo coast with Level 2 bait before 3:00 PM and cast until you land one or the clock passes 11:00 PM. That is the whole strategy.
Tiger Prawn is listed as a Level 2 bait fish. You can technically hook one on Level 1, but the rate is bad enough that it feels broken — so do not rely on it. If you are fishing the right coast at the right hour and still coming up empty, the bait tier is the first thing to check. Bring more than you expect to use; running dry mid-window costs you the whole evening, and the catch is too cheap to ration.

The window is 3:00 PM–11:00 PM. Outside it, your odds are effectively zero, so a midday or post-midnight session that “should” work is just timing failure dressed up as bad luck. Walk to your spot before 3:00 PM so your first cast lands the moment the window opens, instead of burning the early minutes crossing the map. Treat Tiger Prawn as a planned trip for that block of the day, not a “passing the beach” catch.
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Tiger Prawn is a Sea catch, full stop. If you are still casting in a river or pond out of habit, relocate — for a lot of players that single fix turns a dry run into a quick win. Any sea-facing spot in the window with Level 2 bait can produce one, which is handy when you are already near the coast.
For the focused run, go to the Halo Halo ocean coast near the lighthouse. That is the spot players name first when they farm Tiger Prawn on purpose. It is the right balance: specific enough to save time, broad enough that you are not hunting a single tile of sand.

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If you are stocking up on bait and tackle, sort your gear and tool tiers first — see our guide to upgrading tools and unlocking the Workbench — and fold the fishing run into a wider day plan with the event triggers and farm workflow guide so a single evening covers more than one goal.
Three constants, one spot. Use Level 2 bait, fish the Sea, stay inside 3:00 PM–11:00 PM, and start at the Halo Halo lighthouse coast. If you land one in minutes, great; if not, it is ordinary fishing randomness, not a broken plan. Lock the requirements and let the casts do the rest.