While many legacy bots have disappeared, a few remain common for 3.3.5 private servers (like Warmane) and historical reference:

Perhaps the safest fishing in 3.3.5 is actually the fastest. With the right addons, a human can outfish a bot in short bursts.

. These tools range from memory-reading executables to simple pixel-based scripts. Popular 3.3.5 Fishing Bots WoW-3.3.5-Fishing-Bot (C#)

Over time, the methods for creating these bots have evolved significantly: benjamin-t-wilson/WoW-3.3.5-Fishing-Bot - GitHub