Blast fishing

Fishing with live explosives. Throw a bomb into the water, all fish goes belly up. Obviously unsafe, but therefore somewhat popular in comedy.

Anime and Manga

 * One episode of Rune Soldier Louie shows something similar: fishing with high-voltage electricity. It's just as effective and just as disruptive to the environment as fishing with explosives.

Film

 * Crocodile Dundee does [//tenor.com/view/crocodile-dundee-dynamite-strange-fishing-paul-hogan-gif-14500215 this] in the opening of the second film. Then the camera zooms out, and we see.

Video Games

 * Borderlands has "Wanted: Fresh Fish" mission, and Borderlands 2 got a grenade fishing side-challenge.
 * One of things that the Remote Bombs in The Legend of Zelda: Breath of the Wild can be used for is killing the fish while they're in the water, which makes them easier to collect since they can't vanish when you dive in after them.

Web Comics

 * THe FReCKLeD FINGeR goes for dark humor, so how about [//www.theduckwebcomics.com/THe_FReCKLeD_FINGeR/5063424/ suicide bomber fishing]?
 * Saturday Morning Breakfast Cereal had this [//www.smbc-comics.com/comic/2008-02-05 go an unexpected way].

Web Original

 * "[//www.youtube.com/watch?v=k3XZ4qoKGw0 Trout Fishing - Afghan style]"

Real Life

 * Actually can be (and was) done. It's banned in most remotely civilized places — for several good reasons, from overkill of everything in water to handling explosives in the ways prone to having them lost and/or leading to accidents.
 * Soviet aviation found this "inventive" use for rockets. It's known due to an infamous incident which got Vasiliy Stalin (yes, son of Iosif Stalin) removed from post of a regiment commander: their weapon engineer fiddling with the munition was killed instantly, and others wounded (2 of 7 "fishermen" who got hospitalized per the official report, 6 out of 9 per an unofficial telling of one participant), so this had to be reported.