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Table 1 River otter and its candidate prey species evaluated in the study, Illinois, USA

From: Fatty acid analysis as a tool to infer the diet in Illinois river otters (Lontra canadensis)

Taxonomic division Scientific name
Carnivores (predator species) Nearctic River Otter Lontra canadensis (n = 46; 46 tail, and 19 footpad samples)
Fishes (prey)  
  Clupeiformes Gizzard Shad Dorosoma cepedianum (n = 6)
  Cypriniformes Asian CarpaHypophthalmichthys nobilis (n = 5)
Hornyhead Chub Nocomis biguttatus (n = 3)
Creek Chub Semotilus atromaculatus (n = 7)
  Perciformes Greenside Darter Etheostoma blennioides (n = 6)
Bluegill Lepomis macrochirus (n = 10)
Redear Sunfish Lepomis microlophus (n = 9)
Smallmouth Bass Micropterus dolomieu (n = 7)
Largemouth Bass Micropterus salmoides (n = 6)
White Crappie Pomoxis annularis (n = 1)
Black Crappie Pomoxis nigromaculatus (n = 4)
  Siluriformes Black Bullhead Ameiurus melas (n = 8)
Blue Catfish Ictalurus furcatus (n = 8)
Channel Catfish Ictalurus punctatus (n = 8)
Brindled Madtom Noturus miurus (n = 2)
Molluscs (prey) Threeridge Amblema plicata (n = 2)
Asian Clam Corbicula flumineaa (n = 10)
Wabash Pigtoe Fusconaia flava (n = 10)
Fat Mucket Lampsilis siliquoidea (n = 10)
Round Pigtoie Pleurobema sintoxia (n = 5)
Amphibians (prey) Cricket Frog Acris crepitans (n = 10)
Western Chorus Frog Pseudacris triseriata (n = 1)
American Bullfrog Rana catesbeiana [Lithobates catesbeianus] (n = 1)
Crayfish (prey) Northern Clearwater Crayfish Orconectes propinquus (n = 10)
Virile Crayfish Orconectes virilis (n = 4)
  1. aInvasive species.