i have some and they crawl up your hand maybe u can use that to ur advantage maybe put a net on the sand make them crawl up your hand and slowwwwwwwwwly move your hand over the net ...and maybe ull be fast enough to grab the ne or have someone grab the net for u before the escape
try the inverted plastic bottle. cut the top off a 20oz bottle invert it put food inside it. hold it close to the shrimp, they will swim in for the food. hopefully it works for you.