Observation: Pipe-fish
LEO says: This pipefish species looks similar to the Bay pipefish (Syngnathus leptorhynchus), also known as, the Slender-nosed Pipefish that is a native (established) species that ranges from the Southeast (Sitka) Alaska down to the Pacific coast to Baja California (northern Mexico). Pipefish are found in coastal wetlands, and camouflage themselves by mimicking the movement of eelgrass. Related to kelp pipefish, and the Pacific seahorse, Bay pipefish have no scales, but have joined, bone-like rings that encircle the fish's body, with tiny dorsal, pectoral, and tail fins. Pipefish feed on small crustaceans by "slurping" them up from about an inch away.
Source: Monterey Bay Aquarium.
This observation has been shared with the Sitka Sound Science Center for identification.