I have been very lucky with catching fish, I found a coelacanth in around 10 minutes of searching, accidentally found a char by just fishing casually for a bit, and same for the giant snake head. I was looking for the soft shelled turtle actively and was only looking for around 15-20 minutes and caught that too.

Just need to find that turban shell... I looked it up and apparently they come from August to May by diving? Looked a few times for around 20 minutes and haven't found anything.