What might be the correlation between the clarity of the lake water and the occurrence of the full body plate trait?

The clearer the water, the less threatened it is with the full body plate fish.

Explanation:

The correlation between the clarity of the water and the occurrence of the full body plate trait, is that the clarity of the water determines how much of the full bady plate fish will exist in that environment.

This is because the full body plates are dark colored, the less clear the lake water has, the easier it will be for these fish to survive because they will be able to camouflage themselves more easily. However, the greater the clarity of the water, the more affected the camouflage will be, causing a great threat to the existence of this fish.