There’s a long short-story, or maybe a novel where an astronaut crash-lands on a planet where a grass-like species dominates the entire ecosystem. At least on land, he sees some dolphin-like creatures in the ocean. I believe the grass in inedible, and he eventually dies after subsisting on algae. It was released some time after All Flesh is Grass by Clifford Simak, because I remember my dad also had that but it was older (and not about a grassworld).

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