2 Living Species: Goldeye (Hiodon alosoides) (image 1) and Mooneye (Hiodon tergisus) (image 2 and gif below)
Anatomy: silvery cycloid scales; large, metallic-shining eyes; forked tails; two abdominal and pelvic fins as well as a dorsal on their back and an anal fin on their underside, positioned opposite to each other; blunt round snout; teeth present on the tongue, roof of the mouth, and along the jaws
Diet: insects, crustaceans, small fish, and mollusks
Habitat/Range: clear lakes, ponds, and rivers of North America
Evolved in: Early Eocene
(source)
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Propaganda under the cut:
The Goldeye (Hiodon alosoides) is so called for its conspicuous golden irises.
Goldeye eggs are about 4 millimetres (0.16 in) in size and are semi-buoyant (a rare trait in freshwater fish, but more common in marine fish). Their eggs are suspended in the water and drift downstream or to quiet waters.
Goldeyes average less than 450 g (1 lb) and 12 in (30 cm) in length, but can be found up to 910 g (2 lb) or 52 cm (20 in) in some lakes.
The Goldeye is considered a good fly-fishing fish, but not popular with most anglers because of its small size. Its fresh flesh is also considered soft and unappealing, so it was only taken randomly in gillnets and (in the past) sold for dogfood. They are now consumed smoked in oak or apple wood and marinated in a brine of salt, sugar, and spices, mainly in Canada.
The Mooneye (Hiodon tergisus) is listed as threatened in New York, North Carolina, and Michigan. Although Mooneyes inhabit much of eastern North America, many of their habitats are isolated or broken off, so if an isolated population goes extinct or begins to go extinct, no migration of outside Mooneyes can take their place or boost their population. Preferring clean, clear water, the development of agricultural and industrial practices has also led to low water quality, threatening the Mooneyes. Dams also block the migration routes of Mooneyes, and other species.
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