yes, that would be the bait fish. Since you are new to boating, there is a learning curve and it can be tough. The hardest part is understanding you electronics. If you use the DSI it makes it a little easier, but if you watch most of the pro's when they are showing you the electronics they have it on the color graph. Understanding how to read this is the hard part. Don't get hung up looking for bait. Also, how deep is this lake? If it's deep and clear, you may need to go deeper. In S.Cal it's not uncommon to fish bass in 40ft of water on clear lakes. But being clear it is going to take some time to warm up as well. You may try looking for stained or slightly dirtier water which will warm faster then clear as will the North side of the lake due to sun exposure. Stained water also may make the fish less spooky. If I were you, take your boat out, take a few markers buoys with you, and pick an area. One of the areas WRB suggested and spend a few hrs just looking with the electronics so you can get a picture in you mind of what the bottom looks like. Look at the shore, is it rocky, steep, does it have a wash that runs into it somewhere, is it clay or shale, does it have a break where it goes from clay to rock?. These can give you an idea to help get a picture of what you're looking at. If you see something of interest throw a buoy or mark it with a waypoint and keep looking. Once you are done go back and fish the spots that you marked. Being clear I would look for steeper banks where the fish can move vertically without having to go to far. And then look in that area. Asking questions and being observant to EVERYTHING will help. Example, are there flocks of coots? Do they stay in one area of the lake and only in one part of the cove. Odds are they found some underwater grass/weeds and are feeding on it. Guess what I'm saying is be observant. When you fished the bank did you see any bluegill? Just keep looking and keep learning, welcome to the world of fishing from a boat. See when you fished from a shore you had to work with what you had, once people get a boat they think it's gonna be easy, nope just got a bit harder because you're mobile, more options, and tend to fish faster, and try to cover more water. Took me a couple years fishing as a charter captain to take my time, read the conditions and the water, and then find the spot I want to fish where the conditions at hand are going to be the most productive and not try and fish a huge area of water. The more time you put in the easier it will be. Just take notes each time you go out and when you catch fish write down all the info, water temp, depth, water color, etc.