Tell Me A Dragon

My dragon is a water dragon.
He swims with his skin
As blue as dark primadonna,
His tail is extra thin.

His name is Tsunami
Why don't you give it a nickname?
It is Canella:
He controls the rain.

He lives in the Pacific Ocean near Japan.
My dragon glooms in the sea.
With sharp pointed teeth,
He is hard to see.

The pet of lord Poseidon,
Helps him make storm
Cousin of the Loch Ness Monster
He was a good swimmer when he was born.

Now he is a fantastic swimmer!