Aquatic Louse Asellus aquaticus
This first specimen had a body length of about 12mm. Some of the larger ones in my dip were about 20mm.

This guy only wanted to bump against the edge of the dish instead of staying in the center. I tried carbon dioxide with seltzer water to slow it down but there were too many bubbles in the background for photography. Vodka finally slowed it down.
This one was about 1.5mm.
