Personally i've never heard of guys fishing for chokka in durban.
However when watching the sein netters bring in their nets, they almost always have quite a few squid in the net
My father told stories of them fishing for bay squid back in the day, using a light that they would hang close to the water at night., once the first bay squid (pilot) would come up it was always left, it would then decend and the whole shoal would come up to the surface. They would use big nets resembling pool nets to catch them. The popular spot to catch them was at cockaroach corner near the coaling appliances. I seriously doudt if bay squid are caught in the harbour now a days