Catching fish in lava in Terraria requires using special items. Note that these items typically require you to be in Hardmode.
How to Fish in Terraria - Touch, Tap, Play
Lava Fishing Village. : r/Terraria
A Comprehensive Fishing Guide/Calculator
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How to get Obsidian Lock Box - Terraria 1.4
Terraria's fishing is… really fun? #fyp #foryou #daily #terraria #terr
Fishing in lava (Swipe for original). : r/Terraria
Terraria: How to Fish in Lava(Terraria Fishing guide)
How to Fish in Lava in Terraria (Easy Guide)
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After over 18 hours fishing and over 100 obsidifish, I finally got a lava charm in my FTW master world. : r/Terraria
How to Fish in Lava in Terraria, Explained - WhatIfGaming