(Found) HELP! Forgot Title "Group of people colonize new planet, fish in the river turn into killer reptiles"



Science fiction & fantasy
The book must be at least 30 years old. I read it as a child and forgot the title. Our library had horror books of Stephen King, Dean Kootz, Peter Straub, John Saul but i can't find it.

It's about a group of people colonizing an alien planet. It seems calm but then the fish in the river start turning into reptiles who end up killing people and overrunning their camp.

Anyone any idea which book it might have been?
Damn beat me to it, its scifi not horror. A wonderful warning about messing with the environment.

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