Most of the fish which live in Charlotte Harbor are euryhaline. Euryhaline fish can survive in wide a range of salinities or saltiness. The fish in our estuaries need to be euryhaline because the water in Charlotte Harbor can vary from really salty — almost as salty as ocean water — to nearly fresh water which contains hardly any salt at all.
For example, the water near Boca Grande Pass at the mouth of the Harbor is very salty during the winter dry season, especially at high tide when Gulf water has pushed inside the Pass. But the water at Punta Gorda can become completely fresh during the summer rainy season when the Peace River is running hard. Snook live successfully in both places under those extremely divergent conditions, which means that they are euryhaline.
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