These small crustaceans with the one big nipper claw are like magnets for estuary bream, whiting and flathead. They can be found on the large sandflats in enclosed waters at low tide. A bait pump, which can be purchased from any tackle store, is used to suck out the nippers from their holes. Look for patterns of holes in the sand near the waters edge and do a couple of pumps over the holes. If you have no success, move on.
Nippers tend to live in colonies.
When you locate a patch of nippers, pump all around the area. A bucket filled with water to put the nippers in is the only other equipment needed. Keep the water in the bucket cool by replenishing often. A plastic sieve is useful to squirt the tailings of the pump into so you can find the yabbies easily. Also by using a sieve you don't have to wait for the tide to completely uncover the sandflats before you can begin pumping.