''Nun galilaeus'',Kottelat, M. (2012)
Conspectus cobitidum: an inventory of the loaches of the world (Teleostei: Cypriniformes: Cobitoidei).
''The Raffles Bulletin of Zoology, Suppl. No. 26: 1-199.'' also known as the Galilean stone loach, is a species of stone loach in the family

Nemacheilidae The Nemacheilidae, or stone loaches, are a family of cypriniform fishes that inhabit stream environments, mostly in Eurasia, with one genus, ''Afronemacheilus'' found in Africa Africa is the world's second-largest and second-most populous ...

native to

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 ...

and

Syria Syria, officially the Syrian Arab Republic, is a country in West Asia located in the Eastern Mediterranean and the Levant. It borders the Mediterranean Sea to the west, Turkey to Syria–Turkey border, the north, Iraq to Iraq–Syria border, t ...

Description

''Nun galilaeus'' has the elongated, subcylindrical body shape typical of stone loaches with its

mean A mean is a quantity representing the "center" of a collection of numbers and is intermediate to the extreme values of the set of numbers. There are several kinds of means (or "measures of central tendency") in mathematics, especially in statist ...

depth being 15.5% of its length. That of the caudal peduncle being 10.4% while the head makes up a mean of 21.2% of the

standard length Fish measurement is the measuring of individual fish and various parts of fish anatomy, their anatomies, for data used in many areas of ichthyology, including Taxonomy (biology), taxonomy and fishery biology. Overall length Standard length (SL) is ...

. The origin of the

dorsal fin A dorsal fin is a fin on the back of most marine and freshwater vertebrates. Dorsal fins have evolved independently several times through convergent evolution adapting to marine environments, so the fins are not all homologous. They are found ...

sits in front of the vertical origin of the

pelvic fin Pelvic fins or ventral fins are paired fins located on the ventral (belly) surface of fish, and are the lower of the only two sets of paired fins (the other being the laterally positioned pectoral fins). The pelvic fins are homologous to the hi ...

. The dorsal fin has a slightly convex to near straight upper margin and 4-5 unbranched and 9-11 branched rays. The

anal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported o ...

has 3-4 unbranched and 5-6 branched rays. The

caudal fin Fins are moving appendages protruding from the body of fish that interact with water to generate thrust and help the fish swim. Apart from the tail or caudal fin, fish fins have no direct connection with the back bone and are supported only ...

is slightly emarginated, but can look truncated. The body is scaleless and the lateral line extends to the anal fin. The lip is thick and has an irregular outline and there are three pairs of barbels around the mouth, one maxillio-mandibular pair and two rostral pairs. The body colour is generally a light yellowish brown with an irregular pattern of grey brown mottles and a varying number of diffuse bars or blotches which can fuse towards the caudal fin for vertical stripes.

Distribution and habitat

''Nun galilaeus'' is known with certainty from two lakes in the

drainage basin A drainage basin is an area of land in which all flowing surface water converges to a single point, such as a river mouth, or flows into another body of water, such as a lake or ocean. A basin is separated from adjacent basins by a perimeter, ...

of the

River Jordan The Jordan River or River Jordan (, ''Nahr al-ʾUrdunn''; , ''Nəhar hayYardēn''), also known as ''Nahr Al-Sharieat'' (), is a endorheic basin, endorheic river in the Levant that flows roughly north to south through the Sea of Galilee and d ...

Lake Hula The Hula Valley () is a valley and fertile agriculture, agricultural region in northern Israel with abundant fresh water that used to be Lake Hula before it was drained. It is a major stopover for birds migrating along the Great Rift Valley be ...

in Israel and the smaller Lake Muzairib in Syria. It has been

extirpated Local extinction, also extirpation, is the termination of a species (or other taxon) in a chosen geographic area of study, though it still exists elsewhere. Local extinctions are contrasted with global extinctions. Local extinctions mark a chan ...

from Lake Hula and Lake Muzairib is affected by moderate pollution and a declining water level due to over abstraction and low rainfall. However, the species is said to be still abundant in that lake. It has been reported from a third lake,

Lake Tiberias The Sea of Galilee (, Judeo-Aramaic: יַמּא דטבריא, גִּנֵּיסַר, ), also called Lake Tiberias, Genezareth Lake or Kinneret, is a freshwater lake in Israel. It is the lowest freshwater lake on Earth and the second-lowest lak ...

, but that is now thought to be a mislabelled specimen. It is a lake species which can be found near the lake shores. It can also be found in very slow flowing, almost stagnant water in the tributaries to Lake Muzairib where it lives among stones and the roots of

willows Willows, also called sallows and osiers, of the genus ''Salix'', comprise around 350 species (plus numerous hybrids) of typically deciduous trees and shrubs, found primarily on moist soils in cold and temperate regions. Most species are known ...

References

{{Taxonbar, from=Q2382120, from2=Q12237111 Nemacheilidae Fish of Asia Fish described in 1864 Taxa named by Albert Günther Taxonomy articles created by Polbot