up with greg andrew, a fish biologist with the marin municipal water district, and his intern rosa albanese. >> we've got waders for you. you can put these on, keep you dry. >> they let me join them on a survey to track fresh spawning activity in lagunitas creek, one of the last strongholds for wild coho salmon on the central coast. >> right away we've got two nest sites where the female has laid her eggs and the male has fertilized those. >> i gave greg a hand measuring the spawning nest site. >> that's good. doesn't have to be exactly there but pretty close. 7.2. >> normally the coho in the lagunitas watershed finish spawning in mid-january. but the drought has changed the fish's behavior pushing the spawning season well into february. >> what that tells me is that those fish were out in tomorrow's bay holding and just waiting. this is the first time we've actually seen this happen. >> the fish waited for a big storm, a much-needed event that came last week when more than a foot of rain soaked marin county. that deluge prompted 100 coho to surge into the creek to spawn and then die. >> th