Hey boertjie, plz let me know how the fishing goes, i lived in yzerfontein for 8 years and went fishing for snoek all the time as my dad was a commercial fisherman there, and he loved the yellowtail, we moved to paarl from there on i came to middelburg.
From watching the weather, the conditions may not be right for yellowtail as the water is still a bit cold and warm clear water only comes in with strong north westerley winds.
I wish you the greatest of luck