I'm in Corpus and live 2 blocks from the Gulf and am very aware of the
large brown herons here along with the pelicans, seagulls
etc...beautiful birds so large their wings can be heard over the
crashing waves by the seaside.

My soloution was to build a terrace over my pond so the birds can't see
them from far up... plus it gives much needed shade in the brutal South
Texas summers down here.

I have never lost one fish in the the 12 years i have had my pond.