Small Otago river estuary…. I think I know the one you mean
Yeah sea-runs will start coming in from September onward for whitebait, although it can be hard to tell the difference between them and resident estuary fish.
And they come again in Feb-march to spawn up-river, can get some big sea runs in them small Otago rivers, my biggest fish from last season was an 8lb brownie out of an otago estuary. I don’t think it was a sea-run fish, it was quite golden, but very nice condition. It was also one of the few fish I didn’t get a pic of