Mc Millan 968 -Yes if you are using ultra light or a fly they can fight decent in the fast current, but they are rarely over twelve inches.
As Merrilizer mentioned they are normaly filter feeders that eat predominatly zooplankton, mostly a small shrimp like plankton refered to as copepods, and other micro crustations, but there has been record of them eating small fry when available wich might be the reason sibiki rigs work at times. I have caught them many times where they bit the sabiki rather then just snagging them with it. BTW many people catch them on small shad darts and flutter spoons. this can be a great way to catch them when they are too few and far between for snagging. In addition they will eat insects, and larva. The attached link will give some scientific info to better understand this resource. A bit heavy and technical, but informative.
http://fwie.fw.vt.edu/WWW/macsis/lists/M010038.htm