I scuba , but the theory is the same for free diving.
Things I have learnt.
If you find 1 cray stop and look there is usually more than one within a few meters if not a whole nest.
Terrain is important ie, you wont find crays in a kina bed , but I have found them on the edge of a kina bed.
Crays dont normal live near crabs, but they do live in the same atmosphere/terrain as the black and white stripped fish I think its called Paroarey? And if you see yellow sponge stuff covering a boulder look hard at the cracks I have always found crays with Paroary and yellow sponge stuff..
Check holes and cracks.
I use to check every hole and crack ( Keep it clean boys) But have learnt in good visibility dive a little higher and you will see more., in dirty water you will have to check every hole.
I got 5 on saturday , it was luck thou, water was so dirty I literally swam into them.
I have found crays in the thermal layer, ie within a couple of meters of when you feel the water get noticably colder on the cold side.
Different times of the year they will be in the shallows.
The ones on saturday were caught in 6 meters of water.
Cover the ground quickly slow down stop and have a good look when you find 1.
Another trick is if you are unsure of what depth they will be at dive deep at the begining of the dive, crays are often at the bottom where the sand meets the rocks, if your like me and have a compass, set it and on your return back to the boat you can traverse at a higher depth thus covering new ground. Have caught plenty of crays on my last 50 bar...
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