Rosie is preparing the nest. Richie is more interested in a CK. Why isn't he bringing Rosie any fish? Of course, she can catch her own quite ably and has been seen eating fish every day.
After a slow start, the past few days, Richie has upped his game. He and Rosie spend some time together each day, just looking out over the bay. Both are bringing sticks and grass now. And he is bringing fish to Rosie now. And asking for CK's. March 2 was a five fish day! The season has started.
A Day in the Life of Richmond and Rosie. March 2 Fishing and Nesting and Mating
The trout presumably come from the San Pablo Reservoir.