Fish bullying

[Cap'n]

I use a wide mouth jar trick as well but a different variation. I just set the jar on the bottom and wait for the more curious fish to swim in. If they aren't quite so adventurous you can bait the jar with food. Placing it near the damsel's territory will almost guarantee him checking it out. If he's too fast to lift the jar out with him inside then you can trap him with a net placed over the top / side of the jar. Patience is the key.