Catch Of The Day / by Michael Johns

Part of the work we do includes monitoring the diet of several seabird species that serve as indicators of fish populations in the Gulf of the Farallones. This involves sitting in arm chairs near nesting areas or in blinds with a pair of binoculars and watching birds fly in with bill loads of fish. Species such as pigeon guillemots and common murres deliver a single fish held in their bill with every foraging trip, so we can identify the type and size of each prey item fed to the awaiting chick. Earlier in the season, we were seeing a lot of juvenile rockfish in their diet, and it turns out pinnipeds like to take the adults too. This Steller's sea lion was seen tossing a vermillion rockfish at the surface, shredding it into more manageable pieces while the western gulls snatched up the smaller bits.