This article proposes that multispecies anthropology and its curiosities about non-humans constitute a ‘minor anthropology’ that poses challenges not only to anthropological categories, but also to anthropological methods. Through attention to Pacific salmon, I probe why and how anthropologists might explore the ways non-humans know and enact worlds via collaborations with natural scientists. Working with biologists, I examine salmon scales and otoliths, or ear bones, whose crystallization patterns act as a kind of fish diary, recording a fish’s migrations and relations. I take up these methods with an anthropological eye, asking how one might use such practices to learn about multispecies encounters that classical ethnography often misses. Lastly, I demonstrate how anthropologists can engage natural science tools while remaining alert to the politics of knowing.