Here are a series of portals. The fish are very slightly different to one another. This fish appears about ten times between the Saigon Walk in Bankstown and about four of them are portals. The two ends of the walk, which are the circled fishes on both ends are at the Bankstown Arts Centre (the bottom-left) and the Bankstown Train Station (top-right).
I've already gotten all the duplicate reports rejected by Niantic so whatever, they don't see a problem. Is this not a problematic thing not to be duplicated, or am I more than welcome to try submitting all the other fish in-between the existing fish (shown as a starburst in-between each one)?