hard to catch small ones
go along the ocean beach during a storm
and walk the waterline, sometimes they are wallowing in the backwash
if still alive take a bucket and fill with salt water place puffer in it and let it settle
rubber gloves are good to handle them with as once inflated those spines are rigid
take enough water to do a waterchange after about 20 mins or wait on beach till they have deflated and change water
when inflated they seem to foul the water quicker
better end of summer months for pickups