One off year won't impact much, but put two or three back to back and you'll see it. It's out of anyone's control anyway. I don't worry too much about rough water or a little cloudiness, but big temperature swings are bad. Hatch is not always what makes a good year class, survival does. Forage base the first few weeks means a lot. That takes plankton then later forage animals/fish and good environmental conditions, eggs are tough, fry not so much. Just take my word I know what I'm talking about.....