Artificial maggots/gents work. I think Berkley was the brand I used. Basically plastic look alike gents. Either rub them with a pilchard or when you catch the first one, rub in their green poop or even dip into tuna oil or just use as they are.
If no live gents onboard, then just as easy to use small slivers of cockle, pilchard, soften squid, fish flesh, worm etc. The key I find is to start with no float or weight & play with the rig until it works on the day with only a small amount of berley. Often the larger ones are further back. Also, when there are plenty of gar about, there is