Tua'kea's Crab Traps

Objectives
Collect 8 of Tua'kea's Crab Traps and return them to him at Moa'ki Harbor.
 * Tua'kea Crab Trap: (8)

Description
With all the troubles, I've lost my assistants. I was wondering if maybe you could help me?

I have many crab traps under the waves of the harbor. Will you retrieve them for me? I'm too old for that sort of thing and the waters can be very dangerous.

Please, take this bladder. It will help you to breathe while you're down there.

Rewards
You will receive:

Progress
How many crab traps did you manage to retrieve?

Completion
I'm a simple trapper. The world has turned upside-down all of a sudden. It doesn't make sense.

I hope that you'll be able to set it right again.

Progression

 * 1) Tua'kea's Crab Traps (leads to ...)
 * 2) Signs of Big Watery Trouble
 * 3) The Bait
 * 4) Meat on the Hook