You need to fix near the surface of the water. Fish glitch out of the water you should be able to see them. This also happens when you use the net. One of thing why do I need to use the net on a tiny fish? In real life you just lift it out with the rod.
Thankyou for your feedback- we are aware of this first issue, we apologise for this. As for the netting of smaller fish, this is something we could integrate later on but for now, all fish need to be netted.