The question is: does temperature affect the brightness of glow sticks! : what would be the independent variable and would the dependent variable be!

The independent variable is the one that you can control, which in this case would be the temperature.

The dependent variable is what changes based on the independent variable, so is the brightness of glow sticks.

I’d have to say no because without oxygen in the water the fish would all be dead. so if you want to fish for dead fish, pick the ponds with the lowest oxygen concentrations.