As a thief from ancient Egypt, Dark Bakura (who's going by just "Bakura" ICly) probably knew how to spearfish for survival purposes, but he's long since lost his body in his original canon and with it, much of his memories. Because of the loss of this knowledge to time and to Egyptian magic bullshit, however, he'll be very interested in re-learning this technique for his own gain, especially now that he not only has a body again (thanks for nothing Astoria, bodies are terrible, 0/10 do not recommend), but he also has to actually take care of it. No more fucking off into the Ring when the going gets tough for this guy and letting his host deal with the consequences of his neglect.

He'll also appreciate having a weapon on hand in general for, uh, reasons, having carried a knife on his person during the Battle City arc, which is his current canon point.

In addition to spearfishing, he's also going to go back to his old roots by stealing some seashells for his own personal profit. Anyone who wants to question the morality of this or, worse, tries to steal what he stole first will be met with his spear, but never fear: without the magic of the Millennium Ring, he's actually pretty harmless, and the Shadow Mimicry that was given to him by Astoria will also likely be of little use to him here. Feel free to have your character report him to the shark police, somehow convince him to let them join his scheme, or even mug him if that's just how they're feeling when they catch him red-handed!