Thank you for your posts.
On your fish sculpture, I really do not think it is a Dino Martens piece. I looked over by book and saw that all the fish shapes he did were more intricate. Their shapes were also more natural and they looked a bit plump. Yours is the oposite, being very stramlined and thin.
I have seen the fish before, but never with any labels, so I would hesitate in calling it by a specific makers name. Hope this helps a little. If anyone has documentation of a label on this type of fish, it would be great if it was posted!