Without tick manipulation

Give a shark*

Osrs, right?

Edit: sharks provide 20hp, and At level 76 Fishing, players can start catching sharks, but only an average of 150 sharks can be caught per hour, yielding 50,550.

https://oldschool.runescape.wiki/w/Money_making_guide/Catching_sharks

Reminds me of the innumerous hours I spent just levelling to 80.

Fishing levels? I’m heading to Karamja and needs some fishing mates