Results for “congener”

Known from various parts of the middle and upper Mekong river basins with record existing from the Nam Tha, Nam Ou, Nam Khan, Nam Lik, Nam Ngum and Nam Mang tributary systems in Laos, the Nam Noeua (a tributary of Nam Ou) in Vietnam, and the Mae Nam Kok in Thailand. Occurrences in the Chao Phraya drainage in central Thailand most likely refer to the congener R. chiengmaiensis.

This fish is normally imported alongside the congener R. candidianus and is actually the commoner of the two in the aquarium trade. It looks very similar to R. candidianus but does not grow as large and possesses a more rounded snout. Most specimens also have spot-like markings on the sides of the head which has led to them being identified as R. nantaiensis, but the fish do no...

This species has been in the aquarium trade since 2010 and is sold under several names including 'Chinese vermilion goby', 'Zhou's scarlet goby', 'scarlet goby', and 'flame goby'. It can be told apart from congeners by the following combination of characters: second dorsal-fin rays I, 8-9; anal-fin rays I, 7-8; pectoral-fin rays 16-18; longitudinal scale series 29-31; predorsal scales 10-12; vertebral count 10+16=26.

This species is relatively rare in the ornamental trade, where it is sometimes confused with its similarly-patterned congeners S. daemon and S. lilith. These three species all possess 1-3 dark blotches on the side of the body and a relatively large ocellus on the upper caudal-fin base, characters that immediately separate them from the remainder of the genus which lack blotches on the body and have a relatively small ocellus on the upper caudal-fin base.

S. leucosticta is frequently available in the ornamental trade and farmed for the purpose in several countries. It is often confused with its congener S. jurupari in aquarium literature and on websites, but is easily recognised by presence (vs. absence) of prominent white spots or vermiform markings on the sides of the head. Although the presence of white spots on the head does not distinguish it from all known Satanoperca populations (see below), it can...

S. pappaterra is relatively rare in the ornamental trade and much sought after by enthusiasts. It is easily distinguished from all known congeners by presence of a series of prominent black blotches beneath the dorsal-fin, plus a well-defined dark band extending along the side of the body. In recent genetic analyses its genetic distinctness was strongly supported, with S. jurupari and S. leucosticta its closest relatives.

This species is quite uncommon in the aquarium hobby although its name is sometimes used in reference to the similar-looking, apparently undescribed congener S. cf. balteata, and both are also traded as 'sumo loach', 'tri-banded sumo loach', and 'orange saddle-back loach'. Following Kottelat (1990) it's diagnosed by the following combination of characters: unique colour pattern consisting of two da...

Can be told apart from congeners by its colour pattern which consists of 8-11 closely-set, narrow dark bars in the anterior part of the body and 5 wider bars in the posterior part. It also possesses prominent dorsal and ventral adipose crests on the caudal peduncle and 9½ branched dorsal-fin rays.

It can be distinguished from congeners by the following combination of characters: caudal peduncle deep, ≥ the deepest part of the remainder of the body; no dorsal or ventral skin crests along the caudal peduncle; caudal-fin deeply forked, the outermost principal rays in the upper and lower lobes more than twice the length of the innermost: suborbital flap in males present; a well-developed suborbital groove in females; 6–8 very regular bars along the flank.

This species is seen in the aquarium trade on a relatively frequent basis and is sometimes sold as 'bicolor loach' in the United States. It can be distinguished from congeners by its unique colour pattern comprising 9-10 thin, yellowish bars on a dark background in the upper part of the body, and plain whitish colouration in the lower portion.

This species is traded on a fairly regular basis and is similar in appearance to some congeners, most notably S. bella, S. mahnerti, S. multifasciata, S. poculi, S. reticulata, S. longa, S. conirostris and S. udomritthiruji. This assemblage has been referred to as the Schistura multifasciata 'group', and members share a...

This species is distinguished from its Australian congeners S. jardinii and S. leichardti by possessing a lower number of lateral line scales (21-26 vs 32-36). It occurs naturally in a number of colour forms of which three were elevated to distinct species status in 2003, but the current majority view is that all represent S. formosus pending a detailed review. Kottelat (2013) mentions that the red form may...

Semaprochilodus are one of the most common and widespread shoaling fish found in South America. Over a dozen species have been described but most are never imported. They are used as food fish in their native countries. It makes a stunning addition to a community of larger fish. Along with some congeners, S. insignis is commonly known as the Jaraqui in Brazil. It is an interesting species both ecologically and biologically. In nature it migrates over large distances in huge shoals according ...

Semaprochilodus are one of the most common and widespread shoaling fish found in South America. Over a dozen species have been described but most are never imported. They are used as food fish in their native countries. It makes a stunning addition to a community of larger fish. S. taeniurus is also sold as the Silver Prochilodus or Fei Feng. Along with some congeners, it is commonly known as the Jaraqui in Brazil. It is an interesting species both ecologically and biologically. In nature it...

Fish sold under the name S. zonata are sporadically available in the aquarium trade but the majority appear to be the congener S. octozona. The genus currently contains just three members all of which are known only from the Mekong basin. S. octozona is the type species and separ...

There are currently 24 described species of Serrasalmus, many of which look superficially similar. S. serrulatus occupies a particularly confusing taxonomic position and is very tricky to identify positively. According to scientific literature it is very close in appearance to several congeners, most notably S. eigenmanni, S. hollandi, S. humeralis and S. nalseni. The separation of these is largely based on geographical range and it's possible that some of them may turn out to be synonymous...

Live colouration of this species was not included in the original description but the specimens in our images were identified by Dr. Ronald E. Watson, the principal author, as S. exallisquamulus. It's normally misidentified and traded as the Sri Lankan endemic species Sicyopus jonklaasi. It is diagnosable from congeners by the following combination of characters: 14-15 pectoral-fin rays; both genders exhibit small, widely-spaced scales...

This species is also sold under the vernacular names 'golden Chinese loach' and '12-banded Chinese loach'. Along with S. robusta it's the most commonly-traded member of the genus, and the two are often imported in mixed batches, presumably because they occur and are thus collected together in nature. Like most congeners it has a highly flexible, sinuous body which makes it very interesting to observe. S. pulchra can be differentiated from...

This species not often seen in the aquarium trade and is apparently rare in its natural waters, with the occasional individual imported as bycatch in shipments of S. pulchra or S. robusta, or by private collectors. Like others in the genus it has a highly flexible, sinuous body which makes it very interesting to observe. It's told apart from congeners by the following combination of chara...

This species is rarely-seen in the trade due to a relative lack of commercial exports from the middle Yangtze basin. It looks very similar to S. pulchra but can be told apart by the fact it lacks irregular, brownish markings and spots on the side of the head (vs. present in S. pulchra), and like most congeners it has a highly flexible, sinuous body which makes it very interesting to observe.