This Santa Barbara Janolus (Janolus barbarensis) is a brightly-colored nudibranch, a sea slug that is usually found in more coastal waters. “[It’s] a good indicator that water quality has improved in Lake Merritt. The brightly colored cerata (spikes) on its back are used to ward off predators by presenting toxins and stinging cells that they get from the organisms they eat.” Photo by Damon Tighe.

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