so new ideas are floating around to solve the net issue.
1. the net is simply replaced by a big fish and the penguin is chewing on the tail of the fish attached to the submarine. the kid has caught a fish but also the unexpected penguin and as such the physical argument between the kid and penguin causes the interference of the eel.
2. the kid has a big fish on the end of the sub again but this time the kid is hunting for the eel that is out there somewhere. the kid believes he has a snag but it turns out to be the penguin. the eel is attracted and then the hunter becomes the hunted.
3. jaws style the kid and penguin are in the water and a suspense thriller ensues. the kid and penguin are hunted by the eel and majority of the film is built on tension with a mix of pov's from eel and kid resulting in an inevitable clash.