How to Fish Weapons and Upgrades

Quick answer: use a controllable rapid-fire weapon for crowded fights, invest in magazine and recoil help when a boss window is short, and keep explosives for clear burst opportunities. Buy travel or movement improvements when the route itself is costing more time than combat.

Choose by bottleneck

If this happens	Prioritize	Why
Your crosshair leaves the target	Recoil or handling	More damage does nothing if the shots miss. Stabilize the weapon before chasing a higher ceiling.
You die while reloading	Magazine or reload	Long boss animations create brief damage windows; reduce the time you spend exposed.
Small enemies surround the team	Reliable rapid fire	Control and target switching matter more than a slow, high-damage shot.
You cannot create space	Movement, terrain, or defensive utility	Survival creates more total damage than standing still for one extra volley.
The boat trip is the bottleneck	Travel improvement	Once the combat problem is under control, shorten repeated route time.

Weapon rules that hold up

Use the weapon you can aim. A familiar, controllable loadout is more valuable than an upgrade that looks impressive on paper.
Build around the arena. Open ground rewards movement; trees, stairs, tables, and buildings can create reset points for a boss attack.
Keep one burst option. Dynamite or another explosive is most useful when the target is committed to an animation or trapped in a predictable line.
Do not spend the last cash on a speculative upgrade. Keep enough for the bait, delivery, or practical upgrade that starts the next island.

Route loadouts

Encounter	Practical choice	Fight note
Spider Crab	Knife or brass knuckles	Bait the charge, sidestep, and punish the recovery instead of chasing constantly.
Giant Piranha	Pistol for minions; dynamite as burst	Clear smaller targets when they create pressure, then spend explosives on a clean opening.
Pufferfish	SMG with magazine and recoil help	Use trees for spacing and stop shooting when the purple poison trail makes the path unsafe.
Tuna	SMG and terrain	Stairs or the casino table can interrupt the target's pathing and create safer angles.
Albatross	SMG with larger magazine and recoil control	Retreat into a building when you need to reset after a dive or ranged attack.
Bowhead encounters	Assault rifle and constant movement	Open ground and lava punish stationary play more than a small loss of firing time.

Evidence boundary: the encounter notes come from the supplied community route guide and are useful starting tactics. They are not official balance data, and exact prices or unlock conditions may change.