I write this article to help people who still do not know very basic about common behavior of big brown trout and marble trout in Slovenia. There is a fact that big marble and big brownie gets more predator instinct, when reaching 50cm+ in lenght. So from that size they feed more on bigger prey, like bullheads, small fish. They can still take some insects, but it is rare. Espacialy the marble trout stay at one place, not moving at all. When it is feeding time they go searcing for prey. In that time they are pretty agressive. They take almost everythink (frogs, bullheads, fish…).
So when you flyfish for a big ones, you must adjust your tackle and technique for more likely predator fishing. Very important is that you place a streamer on the river bottom as soon as possible( it is like: 1, 2, 3 and boom …streamer is on the bottom). I do it with heavy jig stremaers(7cm , 10g) and this is far best technique for catching big ones. If you do not like this technique, you can do it your own way, but always remember: the whole thing is to reach the river bottom fast.