[Brian of Aquanauts]

Interacting (not interfering) with anilmals and wildlife can bring it's own rewards, beyond just bagging it and taking it home for the missus to cook.

I'm not a marine biologist so any extra info would be good.
The more experienced divers out there probably know these:

So how do you confuse a cuttlefish?

I've tried for quite some time. Normally sticking two fingers up (as you would behind someone's head to give them horns) works best. It mimics the cuttlefishes agressive stance, but they aint used to seeing if from a diver. Moving your fingers across the front of your torch has often initiated them flashing stripes back at me. And if you have a glove that has different textures, maybe black flat and smooth on one side and raised white grips on the other, rapidly turning your hand over and back again sometimes make them try and talk back...

Does spinning the bezel of your dive watch round at different speeds really attract dolphins? Have had varrying levels of success but did manage to dive with a pod for 10-15minutes once before they started scaring me by getting a bit too friendly.

Pushing sand up with your fingers seems to make wrasse want to come close - maybe they think you're looking for food, and are hoping to get some scraps.

The worst case of mimicing involved a friend who has a technique for sounding like a shark crunching crustaceans - i won't tell you the exact technique, but it makes them come real close thinking there's food around. At 40m he was acting as the bait while his buddy filmed. He ended up getting his mask eaten, his reg bitten through, and knocked unconscious.

Anyone know any others?