''Acanthobrama telavivensis'', commonly known as the Yarkon bream or Yarkon bleak, is a

species A species () is often defined as the largest group of organisms in which any two individuals of the appropriate sexes or mating types can produce fertile offspring, typically by sexual reproduction. It is the basic unit of Taxonomy (biology), ...

freshwater Fresh water or freshwater is any naturally occurring liquid or frozen water containing low concentrations of dissolved salts and other total dissolved solids. The term excludes seawater and brackish water, but it does include non-salty mi ...

ray-finned fish Actinopterygii (; ), members of which are known as ray-finned fish or actinopterygians, is a class of bony fish that comprise over 50% of living vertebrate species. They are so called because of their lightly built fins made of webbings of sk ...

of the family

Leuciscidae Leuciscidae is a family of freshwater ray-finned fishes, formerly classified as a subfamily of the Cyprinidae, which contains the true minnows. Members of the Old World (OW) clade of minnows within this subfamily are known as European minnow ...

found only in

Israel Israel, officially the State of Israel, is a country in West Asia. It Borders of Israel, shares borders with Lebanon to the north, Syria to the north-east, Jordan to the east, Egypt to the south-west, and the Mediterranean Sea to the west. Isr ...

, in the

Yarkon River The Yarkon River, also Yarqon River or Jarkon River (, ''Nahal HaYarkon''; , ''Nahr al-Auja''), is a river in central Israel. The source of the Yarkon ("Greenish" in Hebrew) is at Tel Afek (Antipatris), north of Petah Tikva. It flows west throu ...

system.

Description

The silver fish, which grows to a length of , was reintroduced to the Afek springs and Ein Nymphit by the Israel Nature Preservation Authority.

History

Throughout 1950 to 1970, there was a very sharp decline in the species population. The population was stable until a

drought A drought is a period of drier-than-normal conditions.Douville, H., K. Raghavan, J. Renwick, R.P. Allan, P.A. Arias, M. Barlow, R. Cerezo-Mota, A. Cherchi, T.Y. Gan, J. Gergis, D. Jiang, A. Khan, W. Pokam Mba, D. Rosenfeld, J. Tierney, ...

in 1999 which made it near-extinct. The remaining individuals were taken and bred in captivity. In 2006, these fish were re-introduced to 12 rehabilitated sites in its previous range. Since then, large populations of various sizes and ages have been found in these areas. According to the authority's chief ecologist, this shows that efforts to rehabilitate the river have succeeded. Yarkon Bleak preservation efforts began in 1999, when the population dropped to only a few hundred. The project was a joint endeavor of the Yarkon River Authority,

Tel Aviv University Tel Aviv University (TAU) is a Public university, public research university in Tel Aviv, Israel. With over 30,000 students, it is the largest university in the country. Located in northwest Tel Aviv, the university is the center of teaching and ...

and the Israel Nature and National Parks Authority. The fish were transferred to special breeding pools at the university's zoological park, and an attempt was made to reintroduce them to the river in 2002 with little success. The scientists involved believed that this was because of a lack of suitable spawning sites, they built a pond filled with gravel and vegetation and soon there were many juvenile fish seen. In 2005, a second attempt to reintroduce them to the upper part of the river was reportedly more successful, following engineering to create suitable spawning sitesNear-extinct fish reintroduced to Yarkon River
/ref> In 2014, the

IUCN The International Union for Conservation of Nature (IUCN) is an international organization working in the field of nature conservation and sustainable use of natural resources. Founded in 1948, IUCN has become the global authority on the status ...

declared this species sufficiently 'wild' (i.e. no direct intervention) to remove it from its "Extinct in the Wild" category, and is now considered "Vulnerable".

References

{{Taxonbar, from=Q2704671 telavivensis Fish described in 1973 Taxa named by Ethelwynn Trewavas Vulnerable animals Endemic fauna of Israel Taxonomy articles created by Polbot Fish of Israel