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SALMON: From the diminutive counts found in portions of Devil’s Gulch and San Geronimo Creeks, scientists extrapolate that virtually no coho salmon hatched there this spring—compared to thousands of juveniles typically born in the waterways each year. Above, the year’s first adult chinook salmon, which precede the endangered coho, arrived to spawn in Lagunitas Creek last week.    David Briggs

Recent counts of juvenile coho salmon in Devil’s Gulch and San Geronimo Creeks found essentially no “young of year” coho, fish that would have hatched from eggs laid last winter. The dearth is likely the result of extreme drought, said Marin Municipal Water District fisheries scientist Greg Andrews.

Coho typically lay redds, or nests of eggs . . .