I have no experience with awd stuff, but with obj I had to clone the meshes - cloning the ObjectContainer didn't work for me.. So maybe try something like this in your loop:
fishArr[i] = ObjectContainer3D();
for(var j:uint = 0; j<fish.numChildren; j++)
{
fishArr[i].addChild( Mesh(fish.getChildAt(j).clone()) );
}
cheers,
sven
