Early on during our Namibia trip we undertook a pelagic at Walvis Bay. There are a few boats of various sizes that do this. Naturally ours was the smallest. That said, there was no noticeable swell and the provided lunch was just the job.
Over time, the operators have begun by taking people to see the Fur Seals which are interesting and quite attractive. Lately they have managed to get Jackals to come to fish bait. That was a real surprise.
However the real fish fanciers are the Pelicans. They have learnt that fish is available to they get in on the act. You might think they are clumsy. No so, the they can catch fish in the air no bother. Nowadays they also land on the boats to "encourage" the fish production line. Yes, they are almost cute. My strategy was to stick close to the fish thrower and got some pleasing pictures.