Question, for the spawning of fish the length of the day has little importance if the water temperature is good?
And if the water temperature triggers spawning earlier, will the eggs be sufficiently developed?
A+
Photoperiod also matters.
When producers stimulate spawning of YP in tanks, they simulate the fall and winter season water temperatures for proper gonadal development. They also increase the hours of "daylight" when they warm the water temperatures to mimic the spring season for the fish.
I have read a study that YP in captivity will still spawn when the water temperature is "correct" but the photoperiod in "incorrect". But it effects the length of the spawning and hurts the results when both factors are not in synch.
YP will even spawn (poorly) if the water temperature is artificially constrained from reaching the correct temperature.
Life will find a way!
