A Guide To Otoliths Of Minnesota Fishes

Authors

Baylor J. Short

Document Type

Article

Abstract

Investigations into the diet patterns of piscivores can provide crucial information on predator-prey relationships, population dynamics, and responses to changing ecosystems. However, digestive processes often remove or alter physical characteristics that are traditionally used to identify consumed fish. This problem has been addressed to some degree with advances in molecular technologies, although these methods can be costly and require specific training and equipment to do so. In contrast, bony structures such as otoliths, vertebrae, cleithra, and others frequently have morphologies that are unique among families, genera, and species. Because these structures are resistant to digestion, they can be used to identify prey fishes effectively and efficiently in varying states of digestion, if the investigator has access to reference specimens or photos from identified taxa. Although some reference materials for identifying bony structures are available, many are specific to a small number of species. This is especially true for otoliths, which are often more difficult to differentiate among species. To address this issue, we have compiled a photographic atlas of sagittal and astericus otoliths for fishes of Minnesota that have been identified in previous diet studies and during summer sampling within the state. In addition to photographs, this guide will provide insights on distinct morphological characteristics and key differences among similar species, making this a useful resource for investigations of piscivore diets in Minnesota and the surrounding area.

Publication Date

2024

Comments

Faculty sponsor: Dr. Andrew Hafs, Department of Biology, Aquatic Biology Program

Recommended Citation

Short, Baylor J., "A Guide To Otoliths Of Minnesota Fishes" (2024). Journal of Earth and Life Science. 65.
https://pines.bemidjistate.edu/j-earth-life-sci/65