Riddles - Sea animals

I have sharp teeth. I swim in the sea. With my big fin, you can see me. I'm dangerous. What am I?

I float in the sea, with no legs or head. I'm soft and dangerous, and I sting. What am I?

My green shell is my home, I swim and walk very slow. I'm a character in the movie Finding Nemo. What am I?

I am grey and smart, I swim and I play. I have a fin on my back and jump every day. What am I?

I'm red or dark blue, with strong claws. I walk, not swim. I have a hard shell. Some people like eating me. What am I?

I have no bones, but I can still hug with my eight arms. I can squirt black ink. What am I?

I'm tiny. I have got ten legs, two claws and a round shell. I don't walk straight. I walk to the side. What am I?

I have five arms. I live in the sea but I don't swim far. People usually hold me in their hands. What am I?

I have a beak, two wings and two feet. I fly by the sea to find food to eat. What am I?

I have a big mouth, full of sharp teeth. My tail is long. I have got scales, but I haven't got fins. What am I?

I am huge. I swim in the sea. Water comes out when I breathe through me. What am I?