Looks like now is the best time for Barra fishing March to May in King Ash Bay.
Although around reefs and the estuary there are many more other kinds of fish you can catch. 
There are fishing guide tours and packages around the bay and rivers. 

Maybe too popular?   

I always think if there are too many fishermen in the same spot the changes are smaller to get something. 
However, we always go where the other fishermen are.