I am still confused on what you are trying to prove from such little data that you are providing on croakers and menhaden???? The only conclusion i can make from this chart is Populations of species that you took samples of... Heck some days the whole lake is covered in menhaden and some days you cant find one. So what can you prove about that??? Statistically you can "attempt" to prove things with incomplete data. Maybe you have looked at too many numbers or too long of time... haha
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