We have mapping data now and crazy numbers of counts of fish. What we can see is that where the sponges are intact—I can send you the data my students have been working up—you have 20 fish per five square metres, little juveniles in among...everywhere. As soon as you get to where there are not sponges, you don't see that.
The halibut move in and out of that area. It's amazing, these halibut that swoop around. It's remarkable to see. You see more at some seasons, because they move through. Where there aren't these structures, these large elevations of sponges, you have fewer fish. Presumably, the correlation is that this is an area in which small fish are hanging out, away from the current. There's a lot of current in that area, so it's a sort of protection for them. It generally is like a bush: it has all the birds in it.