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Coastal roach still holding on in Berkeley creeks
October 22, 2026
A (Hesperoleucus venustus) was observed in Berkeley on October 2, 2026. This threatened native cyprinid continues to inhabit freshwater creeks in the ecosystem despite its declining range, with repeated observations in the Berkeley area over recent months.
Red speckled dun mayfly found at Tilden Regional Park
October 22, 2026
A Red Speckled Dun mayfly () was recorded at Tilden Regional Park on October 17. Mayfly larvae in Callibaetis are pollution-sensitive aquatic insects requiring clean, well-oxygenated water, indicating that some creeks in the ecosystem still support suitable conditions for these taxa.
Invasive crayfish found in Oakland and Berkeley creeks
October 22, 2026
Red Swamp Crayfish (Procambarus clarkii) were recorded in Oakland on October 21 and Signal Crayfish () in Berkeley on October 16. Both invasive species compete with native fauna and disrupt stream ecosystems, reflecting their established presence in local freshwater habitats.
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