Looks like threadfin. Long dorsal fin and the Lowe jaw doesn't stick way out. The third and largest one might be a blueback. I can't tell. I have to see in person. Threadfin seem to also have a yellow tail. Bluebacks don't. Just what I've seen. How to catch?? This time of the year should be the easiest time to catch them. Look for warm water creeks. They should be in the backs of those creeks. If you can find a water treatment plant discharge that's where u need to be. There is a creek at Lanier that has a water treatment plant about a mile from lake. Herring are in the creek, literally, when lake gets below 50degrees. Creek is barely wide enough to turn boat around. One cast and your done.