I was told this is probably an Eastern Garter Snake... And likely will eat some of the minnows.
I thought about it though, and the minnows are leftover fishing bait shiners that DH and DD brought home (and the goldfish, while wonderful that they survived from last year, were originally PetSmart "feeder" goldfish.... so I'd rather have the snake
Does the garter snake dive all the way down to catch the fish, I wonder....? But this does explain why I was feeling like there didn't seem to be as many fish in the pond as earlier when I was so happy to see they had survived the winter -- fickle me.
I suppose where snakes are abundant including venomous ones, my excitement might seem funny, but you know I try to make my postage stamp in a cookie cutter development a sanctuary of sorts, so I love seeing new species of insects, even pests because that means new predators might be drawn to the feast (I don't spray, etc. the pest for this purpose) ...and I feel like another tier in the form of a snake has been established in the biodiversity of my garden.
So while fully aware of the havoc it may cause among its food groups, I'm thrilled to welcome it among my residents and denizens, and as a new member of the Garden Patrol.
Studio Ghibri "NekoBus on a tree"
(I did feel a bit less guilty for the above when I spotted three minnows and one goldfish just a little while ago