Plagopterus argentissimus 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 temperat.[4]
Es troba a Nord-amèrica: conca del riu Colorado a Utah, Nevada i Arizona (els Estats Units).[4][6][7][8][9][10][11]
Plagopterus argentissimus és una espècie de peix de la família dels ciprínids i de l'ordre dels cipriniformes.
The woundfin (Plagopterus argentissimus) is a species of minnow endemic to the Virgin River of the southwestern United States. It is the only species in the monotypic genus Plagopterus.
The woundfin is a small slender, silvery minnow, with a flattened head and belly, long snout, leathery skin, and no scales. There are barbels on the corners of its lips, and its common name likely comes from the first spinous ray of its dorsal fin, which is sharp-pointed. Its maximum length is rarely more than 7.5 cm (3 in).[2] It can be distinguished from spikedace and spinedace by presence of barbels.
Historically, the woundfin occupied much of the lower Colorado River basin, including two tributaries, the Virgin River and part of the Gila River; however, habitat destruction through dams and water development has led to its extirpation from these regions. In addition, several introduced species, most notably the red shiner (Cyprinella lutrensis) have contributed to a decrease in the woundfin's Virgin River population. The woundfin is currently federally listed as an endangered species, while the United States Fish and Wildlife Service lists the population status as "declining."
The woundfin tolerates highly mineralized, turbid waters. It is typically found in warm, swift streams of high turbidity, preferring a stream speed of one to two feet per second and a depth of eight to eighteen inches.[2] Woundfin lives in part of salty streams, avoiding clear waters and rarely can be found in quieter pools.
The woundfin is omnivorous, and depending on availability will feed on detritus, algae, seeds, and aquatic insects and their larvae.[2][3]
Historically, the woundfin also occupied the lower Colorado River from the Virgin to Yuma, Arizona, and the Gila River from Yuma to its confluence with the Salt River, but habitat destruction through water development (including eight major dams which alter flow) and the introduction of several species (particularly the red shiner (Cyprinella lutrensis), which competes for food and is known to prey upon the woundfin's eggs and young[4]) have led to its extirpation in these regions as well as a decline in population in the Virgin River.[3] Since 1970, the woundfin has been listed as an endangered species. Other listings include "Vulnerable" on the IUCN Red List and "Critically Imperiled" (the most critical classification) by NatureServe. The United States Fish and Wildlife Service lists the population status as "declining." The Dexter National Fish Hatchery in Dexter, New Mexico studies the woundfin in an effort to help conserve the species, and has successfully spawned the fish in captivity.[2] However, efforts to transplant the species into other rivers and creeks have failed due to reproduction not taking place.[5] On July 11, 2007, approximately 50 woundfin were released into the Hassayampa River near Wickenburg, Arizona. The hatchery-raised fish were from wild Virgin River stock. The only wild population of the species is in the Virgin River. An aggressive program to eradicate red shiner from the Virgin River in Utah has all but removed red shiner from reaches previously dominated by red shiner. Fish barriers have been erected to prevent re-colonization by red shiner, and has allowed the reintroduction of hatchery raised woundfin. Several thousand of hatchery-raised woundfin were released in the fall of 2007 and 2008. With red shiner no longer a threat, low flows and high temperatures are the biggest threats still facing woundfin. Another minnow, the Virgin River chub (Gila seminuda), has much of the same range as the woundfin and thus faces the same threats of extinction, particularly competition from the red shiner and a decrease in water quality as the result of agricultural runoff.[5]
The woundfin (Plagopterus argentissimus) is a species of minnow endemic to the Virgin River of the southwestern United States. It is the only species in the monotypic genus Plagopterus.
Plagopterus argentissimus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
Es un pez de agua dulce y de clima templado.
Se encuentran en Norteamérica: cuenca del río Colorado en Utah, Nevada y Arizona (los Estados Unidos ).
El sistema del Río Virgen se ha visto afectada negativamente por el desarrollo de la agricultura y la energía causada por el hombre.
El declive del Plagopterus argentissimus se ha debido en parte a la pérdida de hábitat, fragmentación y degradación causada por las presas, embalses y la desviación del agua. La Finalización del Quail Creek State Park en Utah en 1985 fue seguido por una disminución sustancial en la abundancia y el área de ocupación del Plagopterus argentissimus. A causa de esto las principales amenazas son la competencia y la depredación por parte de especies no nativas (principalmente por el Cyprinella lutrensis) y la degradación del hábitat (flujo reducido / temperaturas elevadas). Las causas de la disminución más reciente en el número de Plagopterus argentissimus se atribuyó a la siguiente serie de condiciones ambientales:
En 1994 El Servicio de Pesca y Vida Silvestre de los Estados Unidos (en inglés, US Fish and Wildlife Service, FWS) declara las siguientes acciones necesarias:
Plagopterus argentissimus es una especie de peces de la familia de los Cyprinidae en el orden de los Cypriniformes.
Plagopterus argentissimus Plagopterus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Plagopterus argentissimus Plagopterus generoko animalia da. Arrainen barruko Actinopterygii klasean sailkatzen da, Cyprinidae familian.
Plagopterus argentissimus est un poisson de la famille des cyprinidés[1], endémique de la rivière Virgin dans le sud-ouest des États-Unis.
Omnivore, il se nourrit d'algues, de graines, d'insectes aquatiques et de leur larves.
Plagopterus argentissimus est un poisson de la famille des cyprinidés, endémique de la rivière Virgin dans le sud-ouest des États-Unis.
Plagopterus argentissimus è un piccolo pesce d'acqua dolce appartenente alla famiglia Cyprinidae, unico rappresentante del genere Plagopterus.
Questa specie è diffusa nelle acque dolci dell'America del Nord (Utah, Arizona, Nevada), dove frequenta zone con corso medio e lento a substrato sabbioso, spesso con acque torbide.
Presenta un corpo snello e allungato, con profili dorsale arcuato e ventre poco pronunciato. Gli occhi sono grandi. Le scaglie sono molto piccole, quasi invisibili a occhio nudo. Le pinne sono trapezoidali, con i vertici arrotondati. La pinna caudale è bilobata. La livrea: un colore di fondo azzurro argenteo con vivi riflessi metallici. Il dorso è più scuro, il ventre tendente al bianco. Le pinne sono trasparenti, con velature d'azzurro e di grigio.
Raggiunge una lunghezza massima di 10 cm.
La fecondazione è esterna, con deposizione delle uova lasciate a sé stesse: non vi sono cure parentali. Il periodo riproduttivo avviene, nei luoghi d'origine, tra aprile e agosto.
Questa specie si nutre di piccoli pesci, insetti, vermi, invertebrati in genere.
P. argentissimus è stato iscritto alla Lista Rossa IUCN a causa delle modifiche al suo habitat naturale: infatti nei fiumi dove è diffuso si è registrata la costruzione di numerose dighe che hanno interferito con il normale scorrimento delle acque fluviali.
Plagopterus argentissimus è un piccolo pesce d'acqua dolce appartenente alla famiglia Cyprinidae, unico rappresentante del genere Plagopterus.
Aštriapelekės (Plagopterus) – karpinių (Cyprinidae) šeimos žuvų gentis.
Gentyje vienintelė rūšis – sidabrinė aštriapelekė (Plagopterus argentissimus).
Plagopterus argentissimus is een straalvinnige vissensoort uit de familie van de eigenlijke karpers (Cyprinidae).[2] De wetenschappelijke naam van de soort is voor het eerst geldig gepubliceerd in 1874 door Cope.
Bronnen, noten en/of referenties傷鰭魚(学名:Plagopterus argentissimus)是輻鰭魚綱鯉形目鯉科的其中一個種,是傷鰭魚屬中的唯一一種。僅分佈在分布於北美洲美國猶他州、內華達州及亞利桑納州的維琴河(Virgin River)內。體長可達10公分,棲息在底層水域。