We used an open bottomed compost bin brought out with us from UK.  After a while we realised the developing black gold was full of red brandlings which found their own way into the bin.  Since moving house to another area, there are no brandlings but there is a large number of soldier flies which are just as welcome (their maggots do the munching).  Importing brandlings artificially though may not guarantee their long term ecosystem perhaps (??)

All shops here that sell bait for fishing, sell worms and maggots.
Natural baits are allowed?
But not live bait, such as small fish, sqid etc. that are used to catch cat fish.