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New Species Found

Bloodfin Tetra
Aphyocharax Yekwana

The Caura River Basin, in the state of Bolivar, is an area of pristine tropical forest and waterways tucked away in the highlands, about 500 kilometres (300 miles) south-east of the Venezuelan capital Caracas.  The 70-meter Salto Pará waterfall divides the Caura River into two biologically distinct zones. The Caura River Basin sits atop the Guayana Shield, a single massive geological formation that runs beneath northeastern South America. Formed more than two billion years ago, the shield supports the single most intact tropical wilderness area in the world. The Caura River is one of the greatest tributaries of the Orinoco River.

28 August 2003. A previously unknown species of bloodfin tetra, Aphyocharax Yekwana, one of 10 new species of freshwater fish discovered by scientists studying the Caura River Basin, an unspoiled jungle wilderness in southern Venezuela. The scientists announced their discoveries in Caracas on Thursday and called on the Venezuelan government to protect the area.

CARACAS, Venezuela (Reuters) - Scientists studying an unspoiled jungle river wilderness in Venezuela have announced the discovery of 10 new fish species, including a red-tailed tiddler, a "punk" catfish with a spiky head and a piranha that eats fruit as well as flesh. They called on the Venezuelan government and international conservation bodies to protect the Caura River Basin in Bolivar state, a vast area of pristine tropical forest and waterways covering five percent of the surface of the oil-rich country. Conservationists fear encroachment by human settlement, as well as fishing, farming, mining and possible government hydroelectric projects, could destroy what they call one of the world's richest biodiversity "hotspots". "The Caura River Basin requires immediate and urgent protection as a wildlife reserve," said Antonio Machado, a zoologist from Venezuela's Central University who announced the new fish discoveries in Caracas on Thursday. Among the 10 new freshwater fish species logged was a tiny fish with a blood-red tail, a previously unknown variety of the Bloodfin Tetra family, which is popular with aquarium owners. This had been given the scientific name in Latin of Aphyocharax yekwanae in honour of the Ye'Kwana Indians who live among the Caura River Basin's flooded forests and waterways. "These indigenous people depend on the water," Machado said.

 

He said any attempt to divert or dam the river for hydro-power development -- like the huge power dams on the eastern Caroni River that generate more than 70 percent of Venezuela's electricity -- would reduce water levels and dry up waterfalls. This would threaten hundreds of varieties of freshwater fish, shrimps, crabs and aquatic plants. "They can do what they like on the Caroni, but they must leave the Caura alone," Machado said.

Some Facts on the Bloodfin:

Scientific Name Aphyocharax anisitsi
Family Characidae
Community Docile
Class Tetra
Temperature 78 ºF
Swimming Range Middle
Adult Length 1 3/4-2 inches
Feeding Habits: Live blood worms, glass worms, brine shrimp and tubifex worms. Frozen vegetable diet, daphnia, plankton, beef heart, brine shrimp, glass worms and blood worms. Flake and freeze dried foods also accepted.
Compatibility Peaceful and schooling with fish of the same size.
Habitat Argentina: Moderately decorated with rocks, live plants and driftwood.
Breeding The anal fin of the male has a small hook on the end. During spawning 300-500 eggs are produced.
Additional Comments The Bloodfin has an average life span of ten years.

Other new and as yet unclassified species found included a variety of tentacled armoured catfish, whose tangle of spiky protuberances on its mouth and forehead -- looking like a punk rocker's hairstyle -- has earned it the name of "punk" fish. (Ancistrus sp)

Also discovered was a new piranha, different in size and shape from other known varieties of the South American flesh-eater. It supplemented its meat diet by eating fruit from submerged trees, Machado said. A new species of freshwater shrimp was also found.

"BIOLOGICAL SWAT TEAMS"

In conjunction with Washington-based Conservation International, he presented, after several years of exhaustive study, the definitive findings of a three-week expedition that studied the biology of the Caura River Basin in late 2000.  Explaining the delay in announcing the expedition results, Leeanne Alonso, a director at Conservation International, told Reuters: "These scientific studies are a lengthy process". The conservation group, which studies and protects the world's natural wildernesses, calls its expeditions Rapid Assessment Programs or RAPs in which "biological SWAT teams" of scientists swoop into often unexplored regions by plane, helicopter or boat to assess their ecological value. Machado said it was essential to preserve intact the free-flowing watercourse of the (420-mile) 700-km Caura River, which is one of the tributaries of the mighty Orinoco.

 

 

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