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Rhinichthys obtusus és una espècie de peix de la família dels ciprínids i de l'ordre dels cipriniformes.
És un peix d'aigua dolça i de clima subtropical.[3]
Es troba a Nord-amèrica: conques dels rius Mississippi i Ohio als Estats Units i el Canadà (Manitoba).[6][3][7]
Rhinichthys obtusus és una espècie de peix de la família dels ciprínids i de l'ordre dels cipriniformes.
Western blacknose dace (Rhinichthys obtusus) is a common species of ray-finned fish belonging to the family Cyprinidae (minnow or carp)[3] and the genus Rhinichthys. Western blacknose dace have tan to dark brown backs, lighter sides, and cream colored undersides.[4] Dark blotches are sporadically scattered across their sides and backs.[4] A distinctive dark colored mid-lateral stripe from the tip of the snout to the caudal peduncle is present.[4] The snout is relatively long and they have a slightly sub-terminal mouth.[5] The stripe is dark brown in females and is a rusty pink color in males during spawning season.[6] The lateral stripe is more pronounced and the caudal spot is present in juveniles.[7] Similar to other species of dace the western blacknose dace give the illusion of having no scales but in actuality the scales are so small they are hard to see.[4] Western blacknose dace are typically 2-3 inches long but can grow to as long as 4 inches.[4] They have a forked tail, single dorsal fin with 8 rays and no spines, a pelvic fin on the abdominal, no adipose fin, and an anal fin with 7 rays and no spines.[7]
The western blacknose dace inhabits the upper Mississippi, Ohio, and Great Lakes drainages, from as far north as south-central Canada to northern Alabama and Georgia and east to eastern Lake Erie.[1] Young daces prefer to inhabit shallower, quiet pools with silty bottoms while more mature daces prefer streams with consistently high turbulence patterns and plenty of places to hide since they are a prey species.[8] Most often they occupy water depths ranging from 100 to 200 mm with gravel or cobble bottoms.[8] They can also be found in riffles hiding under large rocks or boulders.[4]
Spawning begins in spring and continues to mid-summer depending on water temperature.[8] The western blacknose dace spawn in areas with gravel bottoms unlike other daces who spawn in the beds of other Cyprinids.[4] Since the western blacknose dace is so short lived, only living up to four years, daces begin reproducing after 2 years.[4] Unlike other species of dace the two Ohio Rhinichthys species do not spawn in the nests of larger minnow species.[5]
Western blacknose dace are mostly carnivorous and exhibit changes in diet as they grow older. Young dace diets consist mostly of Dipteran larvae.[8] Mature daces continue to feed on Dipteran larvae when available but a large portion of their diet also include amphipods.[8] The change in diet is thought to be because of the change in the areas that they inhabit once the daces mature.[9]
Western Blacknose Dace from Indiana. Western blacknose dace (Rhinichthys obtusus) is a common species of ray-finned fish belonging to the family Cyprinidae (minnow or carp) and the genus Rhinichthys. Western blacknose dace have tan to dark brown backs, lighter sides, and cream colored undersides. Dark blotches are sporadically scattered across their sides and backs. A distinctive dark colored mid-lateral stripe from the tip of the snout to the caudal peduncle is present. The snout is relatively long and they have a slightly sub-terminal mouth. The stripe is dark brown in females and is a rusty pink color in males during spawning season. The lateral stripe is more pronounced and the caudal spot is present in juveniles. Similar to other species of dace the western blacknose dace give the illusion of having no scales but in actuality the scales are so small they are hard to see. Western blacknose dace are typically 2-3 inches long but can grow to as long as 4 inches. They have a forked tail, single dorsal fin with 8 rays and no spines, a pelvic fin on the abdominal, no adipose fin, and an anal fin with 7 rays and no spines.
Rhinichthys obtusus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
Los machos pueden llegar alcanzar los 8 cm de longitud total.[1][2]
Come insectos acuáticos.
Es un pez de agua dulce y de clima subtropical.
Se encuentran en Norteamérica: cuencas de los ríos Mississippi y Ohio los Estados Unidos y Canadá (Manitoba ).
Rhinichthys obtusus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
Rhinichthys obtusus Rhinichthys generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Rhinichthys obtusus Rhinichthys generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Rhinichthys obtusus is een straalvinnige vissensoort uit de familie van de eigenlijke karpers (Cyprinidae).[1] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1854 door Agassiz.
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小點吻鱥（学名：Rhinichthys osculus）为輻鰭魚綱鯉形目鲤科的其中一種，分布於北美洲加拿大卑詩省、美國西部及墨西哥，本魚身體細長，在背鰭之前的最大高度，頭部鈍三角形，嘴下方像吸管一樣，下頜有肉質的唇。整體的顏色灰色或灰褐色有分散的與模糊的較深色的斑紋，通常在側邊的中線之上；下側與腹面略微淡黃色或乳脂色的白色，體長可達11公分，棲息在岩石激流區。
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