It also depends where you are in the lake or in where you are in the channel and how much flow is coming down the river. I've seen it get ugly on top during short duration storms and then we've seen it get fresh from top to bottom on the upper end. Each incoming tide pushes salt water up under the fresh. It may take several weeks of back and forth tide mixing and wind to mix it all back togther unless there is a prolonged flood event like we had last fall, winter, and spring.
Fish deeper with slightly heavier jig heads, and keep moving closer to the pass until you find fish.
As for the 'only catch one' question, they arn't always in schools and sometimes they roam as singles and as 3-5 fish groups. Your cast might have been perfect for that one out of the 3 but then the next cast is a little off and you don't catch anything. Try to keep fishing the same structure and depth where you caught the one and your likely to be in the ball park a little more often.
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