Are there any sea creatures in Avatar?

Question

Are there any sea creatures in Avatar?

Being that James Cameron's ideas and influences were heavily influenced by earth sea creatures: James Cameron’s Love for Scuba Diving Shows in Avatar

“I just swept in every design influence in my life. I've always had this deep respect for nature and a lot of my youth was out in the woods hiking around. I was a total science geek. I spent over 2,500 hours underwater and I've seen things that are absolutely astonishing on the bottom of the ocean. It really is like an alien planet. I've always felt like that's something I've been able to do was live out a science-fiction fantasy adventure for real in my diving work. So yeah, there's a lot of stuff there. There's even a lot of stuff in the shallow ocean that's influenced things. The Banshee wings are based on the colourations of tropical fish, for example. We were a little concerned that these large creatures wouldn't scale with these incredibly vivid colour patterns, but we managed to make that work.” – James Cameron

And we are shown Jake falling in to what looks like a river, an ocean looking like scene when gathering the tribes and we are even shown Jake and Netiri swimming. There seems to be a lack of water dwelling creatures.

Seeming James Cameron's love of the ocean, there seems to be a very visible lacking presence of water dwelling creatures.

Was there anything in or out of universe that shows James Cameron having water dwelling creatures?

Answers can be plain and simple, either he did or didn't or even we are never shown will be accepted.

Answer 1

According to Cameron, the oceans of Pandora are just as rich and diverse as the land masses.

“We created a broad canvas for the environment of film. That’s not just on Pandora, but throughout the Alpha Centauri AB system. And we expand out across that system and incorporate more into the story – not necessarily in the second film, but more toward a third film. I’ve already announced this, so I might as well say it: Part of my focus in the second film is in creating a different environment – a different setting within Pandora. And I’m going to be focusing on the ocean on Pandora, which will be equally rich and diverse and crazy and imaginative, but it just won’t be a rain forest. I’m not saying we won’t see what we’ve already seen; we’ll see more of that as well.”

_{^{Cameron Talks ‘Avatar 2’ & Extended ‘Avatar’ Release}}

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Tangentially, the "Pandorapedia" mentions that Tetrapterons come in differing varieties; aquatic and arboreal and that those that live by the oceans enjoy a

"feeding ecology"

as

"fish-eating"

predators.

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The World of Avatar: A Visual Exploration book also mentions several sea creatures;

Answer 2

With the opening of the new "Pandora - the World of Avatar" land at Disney's Animal Kingdom at Walt Disney World (developed in partnership with James Cameron), we have a definitive answer to this question.

(marking as a spoiler for any who wish to visit the new land free of pre-gained knowledge)

In the "Flight of Passage" attraction, as you soar on the back of a Banshee in your avatar body, you come inches away from a gigantic sea creature breaching up from the ocean. So, yes, there is most definitely sea life on Pandora.

Answer 3

Although we will wait for the second film to know more about the aquatic creatures of Pandora.

If there are aquatic creatures, in fact part of the Tretapteron mentioned in another comment.

One knows of two aquatic creatures.

One is the "Anemonoid", these are already seen in some scene of the first film. Anemonoid

The other known creature is the "Dinicthoid" according to its definition is:

"Its head features two large, protruding red eyes that can see for long distances under water in dim light. It also features a disconcertingly humanoid false face, (used to befuddle or Frighten would-be predators), that is created by folds at the top of the skull. "

If you want more information: Dinicthoid

Answer 4

There are three known ocean creatures. The "ilu" which is a plesiosaur-like creature, the much bigger "nalutsa", and lastly the "akula", the "cousin" of the nalutsa which is more fierce and elusive.