Tomales Bay What is chasing what?

Name that predator.
Was at Nick's cove a couple of weeks ago and saw the most amazing pelican attack.  It went on for at least 45 minutes, moving up against the shore and then out a bit. there were scores of birds. The water is pretty shallow thru here.
I assume there was a large number of anchovies being herded, but I don't know what was chasing them.  I didn't see any seals in the water so I assume it was halibut or salmon but there are probably a lot more halibut around.  I used to fish a good sized run of coho in the bay years back.
Sorry for the fuzzy pictures. I only had my iPhone.
I was out having an anniversary dinner and fishing was out of the question.
Any one ever fish conditions like this or know what was happening?

Stripers, salmon, White Sea Bass...

To have been in a kayak in the midst of that could have been awesome !!! 

Thanks for the pics.

Are there a lot of stripers there? That would be my guess, having seen similar scenes a few times around the Monterey Bay...

Some locals I just spoke to think they are stripers for sure

That area just north of the launch is just a few feet deep. Definitely seems like a striper thing to do to corner a bait ball in the shallows like that and pick them off.

My guess is stripers too, saw the same thing going on a month or two ago by Hog.  Even saw a big one (maybe around 10-15# class?) hit some of the bait at the surface about 10 feet from me.  I didn't catch anything that day because I suck at fishing Tomales.   

Just saw this happen this afternoon.  Some bait school and all the birds were going crazy.  School moved too fast before I could get there and toss a swimbait.