A 4wt is a great all around rod for smaller fish.I use mine for small stream bass both smallmouth and largemouth.I have used it for carp up to about 5lbs,small stripers in the salt,as well as croakers and spot.Its a good weight rod for pickerel,perch,and trout.Of course it has its limitations on the size of flies it will handle and the wind but I think its the most versital of the light weight rods.