"Burn" will work if you're on top of the water and the fish is close to the top...I guess it boils it to death, LOL! Boiled fish, yuk.
I've found most Fiend spells work well underwater, including "Pain"...definitely a reason to get Fiend magic Burning Haze may work, but you'd probably have to cast it on something in the water from outside the water...every fire spell I've cast underwater has fizzled for obvious reasons.
If Burning Haze works, some of the storm spells like "Firestorm" might work as well...but, again, only for near-surface denizens. On the other hand, Icestorm might work since it's water-based.
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