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Anguillidae (eels)

Anguillidae (eels). Pennsylvania Fish and Boat Commission. Eel-like body (long, slender) Terminal mouth; jaws Small opercle Small scales; smooth skin Long dorsal fin continuous with caudal, anal fins; no pelvic fin Homocercal caudal fin. American eel ( Anguilla rostrata ) ). Anguillidae.

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Anguillidae (eels)

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  1. Anguillidae (eels) Pennsylvania Fish and Boat Commission • Eel-like body (long, slender) • Terminal mouth; jaws • Small opercle • Small scales; smooth skin • Long dorsal fin continuous with caudal, anal fins; no pelvic fin • Homocercal caudal fin American eel (Anguilla rostrata))

  2. Anguillidae • Catadromous • Females migrate long distances (15 years in fresh water); males remain near coast • Nocturnal movements (can move over land) • 3 larval forms (leptocephala, glass eels, elvers) • Uncommon in Iowa; large rivers American eel (Anguilla rostrata))

  3. Clupeidae (herrings, shads) • Laterally compressed • Silvery scales • Saw-tooth margin (pointed scales) on abdomen (belly) • No lateral line • Fins lack spines • Caudal fin homocercal, forked Pennsylvania Fish and Boat Commission gizzard shad (Dorosoma cepedianum))

  4. Clupeidae • Diets primarily zoo-, phytoplankton; gizzard shad strain organisms form soft sediments • Gizzard shad an important food web component in lakes and reservoirs with soft bottoms Ohio Department of Natural Resources gizzard shad (Dorosoma cepedianum))

  5. Hiodontidae (mooneyes) • Laterally compressed • Silvery color • Large eye • Part of belly sharp/knifelike, but no saw-tooth margin • Lateral line present • Fins lack spines • Caudal fin homocercal, forked GLERL/NOAA mooneye (Hiodon tergisus))

  6. Hiodontidae • Diet consists of small animals, including fishes • Sportfishes where they are common (e.g., western Canada) • Uncommon in Iowa; present in large border rivers University of Alberta Department of Biology goldeye (Hiodon alosoides))

  7. Salmonidae (trouts) • Terminal mouth • Small scales • Fins lack spines • Adipose fin • Axillary process at base of pelvic fin • Caudal fin homocercal, squared or forked brook trout (Salvelinus fontinalis))

  8. Adipose fin Axillary process Eddy and Underhill (1978)

  9. Salmonidae Virginia Tech virtual aquarium • Cool/cold waters • Prey on invertebrates, fishes • Economically important sport/food fishes • Brook trout native to northeast IA; 2 nonindigenous species propagated, stocked (some natural reproduction) brook trout (Salvelinus fontinalis))

  10. Umbridae (mudminnows) • Terminal mouth • Lateral line absent • Fins with soft rays • Dorsal, anal fins toward posterior end of body • Caudal fin homocercal, rounded New York State Department of Environmental Conservation central mudminnow (Umbra limi)) University of Michigan Museum of Zoology

  11. Umbridae • Inhabit swamps, ponds • Very tolerant of low oxygen concentrations, drought • Bury themselves in mud • Prey on invertebrates University of Michigan Museum of Zoology central mudminnow (Umbra limi)

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