We get questions like this fairly often. The answer is pretty simple...any rod can catch just about any fish out there!
When you see line (or pound) ratings on a rod it is a suggestion for the best line class to put on a rod for overall performance, not a pound range of the size fish that the rod can catch. (Too heavy of line will not cast very well and if too heavy could cause the rod to break under enough pressure. While, too light will not let you get the power out of a rod you may be looking for and could also limit your casting distance)
The size of the fish does not play into this line rating much at all (more important factors would be the reel being used, drag settings, and line capacity), as small fish can easily break heavy line and big fish can be caught on light line. Avoid buying rods based on "how big of fish" you can catch with them, but more on action and uses.