Hi Andre, Fishing during daylight hours is not quite the ideal time of day to fish.
Fishing is best over high tide so you should best have your baits in from about two hours before high tide, no matter time of day even if at midnight. Best fishing is at daybreak and sunset especially when it coincides with high tide, and night time also tends to be more productive than during the day especially in such clear water as at Kosi Bay.
Important is to persist, have your line in the water as often as possible, and follow the good advice from fellow successful anglers on the forum.