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Navicula? Nitzschia? I think in any case it is likely a marine diatom (algae). I didn't see many of these rice-shaped organisms in the sample.
A marine biologist on board skimmed some plankton using really fine mesh nets and we took a drop from that sample and placed it under a microscope. The sample was skimmed in Izhut Bay just off Afognak Island in somewhat shallow water (less than 200 feet).