Problem with an object

[Phylloxera]

I have an object (fish) when I position it under water, in spite of the transparency of this one it does not appear? You have a solution with this problem! Thank you!

Sorry I have a problem with this topic ! 

[Oshyan]

Objects that have incorrect or reversed normals will not show up correctly underwater. Try the "flip normals" option or fix/adjust normals in a 3rd party modeling tool or converter like Poseray.

- Oshyan