spider crab claws are awesome
get them myself
tools for the job...
big old school bag
flippers/fins (either will do, i use my manta blades)
5-10m 1/2" ID tubing (spare from watercooling)
bodyboard (to gently tie the tubing onto)
weight belt (either a real one, or tie rocks to a rope and use that to weigh yourself down)
pair of wetsuit gloves
snorkelling mask
they tend to explore more when it's mildly sunny, and they often stay in fairly large pockets of crabs, say 5-10 within close proximity of each other, on rocky beaches / coves
do some quick dives first without the belt / tubing to find an area that they are in
now go down with the tubing in your mouth and weight belt, with the bag at hand.
only breathe
in through the tubing, or you'll deplete the oxygen if you keep breathing in and out in the tube, so breathe out through your nose
fill the bag with spider crabs, once you're done, untie the rocks and keep the rope.
then get home ASAP and put the bag in a freezer
the crabs will go into a hibernation like state as they're used to cold temperatures anyway, this seems more humane to me that throwing them straight into a boiling pan of water
now look up any spider crab cooking guide and you're off
they make great soup too
the only downside to this, is I get bad nightmares about the japanese ones getting me back, as revenge..
http://en.wikipedia.org/wiki/Japanese_spider_crab
4m leg span