I've dabbled a bit with the owd long nets ( mainly night time ) and often on places I shouldn't have been. In my opinion the cheapest 4z 4" net is all you need , very capable of catching in number ( with the right amount of running kill ) if they are there. I have a couple of ancient 50yrd 4z nets here made with sheet netting from Advanced netting which have caught plenty. We ( smithie and I ) went down the thermal route and it spoiled the whole experience...