Behaviour 2019
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Gross neuroanatomy in three species of invasive Asian carp
Matthew K LeFauve1, Karly E Cohen2, Amy E Goerge3, Duane C Chapman3, L Patricia Hernandez1. 1George Washington University, Washington, DC, United States; 2University of Washington, Seattle, WA, United States; 3United States Geological Survey, Columbia, MO, United States

Fish brains are incredibly diverse, reflecting the associated demands of the broad ecological and behavioral needs of this enormous vertebrate group. Within this diversity there are patterns revealing that both phylogenetic and ecological factors play large roles in determining neuroanatomical diversity among species. In fishes, the size of sensory-related brain regions provides a clue into the relative sensory importance for an organism. We present a 3D rendering of micro-CT scanned adult grass, silver, and bighead carp brains to provide an understanding of the neural gross morphology in these species. Differences in brain location and overall architecture reveal that there are substantial morphological differences between the grass carp and the bigheaded carps (silver and bighead) suggesting a strong phylogenetic signal affecting the observed neural gross morphology. Preliminary histological results reveal differences between the bigheaded carps as well, suggesting an ecological component to cytoarchitectural differences. Our results show support for an interplay between phylogeny and the environment in neural architecture in these carp species.