Been there a few times, have not caught anything.
First time was a nice day with a moderate swell. A bunch of guys on the pier had a pile of dead skates. I caught nothing all day.
The second time I fished up near the cliffs, it was a cold southerly wind with a nasty sea. I fished dusk and into the night. I had one short run but that was about it. Mainly used prawn/shrimp that night.
I find seaview to be the most productive site close to Blenheim.