Results for “population”

This species varies in colour pattern depending on locality. Some of them are sold under several such names with the variant from Kigoma being known variously as A. compressiceps "Kigoma red", "Kigoma red fin", "Kigoma orange top" or "firefin" for example. The different populations should ideally be kept apart in aquaria and clearly labelled with collection locality in order to avoid hybridisation. Forms popular in the aquarium hobby include: - &quo...

C. strigata is an enduringly popular species in the aquarium hobby but is not bred on a commercial basis with all fish offered for sale collected in the wild. It can be told apart from other members of the genus by its larger adult size and dark, marbled colour pattern appearing as a series of dark and light stripes running diagonally across the body below the lateral line. This colour pattern is variable and popul...

C. bleheri is a popular aquarium fish though it remains unclear whether collection for the ornamentaol trade is having a detrimental effect on wild populations (see 'Habitat'). It's one of several genus members to lack pelvic fins and can be further distinguished from other Channa species by the following combination of characters: sides of lower jaw with one large cycloid scale; lateral line complete with 46-50 scales; 14 pectoral-fin rays; 25 anal-fin rays; 4-11 irregular reddish orange markings on the caudal-fin

This species was one of the first cichlid species to be spawned in captivity and has been in the hobby for over a century. It is less popular than it once was but remains a good choice for the beginner as it is tolerant of a wide range of water conditions and is easily bred. There currently exist 2 subspecies, Pseudocrenilabrus multicolor multicolor and P. m. victoriae. These are quite distinct in terms of colouration and patterning and exist as separate populations in nature. Both subspecie...

This popular species is also known as the 'three-lined' rasbora and provided a large enough tank is available it is an excellent choice for those new to the hobby. The 'scissortail' moniker is derived from the characteristic twitching motion of the when the fish is at rest. It can be distinguished from the similar R. caudimaculata by lacking red colouration in the and from R. spilocerca by its much larger size. Several geographical forms appear to exist as some wild populatio...

A single male of the Tequila Splitfin was sampled in 1955 by Miller and Greenbank, but identified erroneously as Zoogoneticus quitzeoensis, with which species it was collected and found sympatrically . Many years later, the mistake was detected, the fish identified as a new species and finally, 43 years after the first capture, described by Webb and Miller. In 2001, a wild population of this species was rediscovered in a very small spring pool (3 x 4m in diameter). The population there was composed of only a handful of adult fish and a few tens of juveniles (De la Vega-Salazar et al., 2003). In 2007, N. W. Bailey et al showed, that the allelic richness of this population (though it was comparable in size to an aquatic stock) was higher than in any aquatic stock. In 2013 the loss of this population was reported (pers. comm. Domínguez), so there is not much hope that this species is still persisting in the wild.

Wild populations vary in colour pattern depending on origin, and some populations have previously been described as distinct species. A form from Peru has a particularly silvery body colour, for example, while another, marketed as 'super red' possesses an unusually long red stripe on the body, extending much of the length of the dark central stripe. A population from around Boa Vista in the rio Branco system, Pará state, Brazil has an ocellus o...

This species is assigned the codes A220, A221 and A222 under the DATZ 'A' number system with these referring to similar-looking, possibly conspecific, populations. These differ in some aspects of colour pattern, particularly the orientation of the caudal-fin markings which may be horizontal, vertical, or somewhere inbetween. One population displays an orange colouration on the belly and is som...

Like most badids this species is poorly documented and has yet to find significant popularity in the aquarium hobby. Within the genus it is most closely-related to B. pyema but the two are unlikely to be confused as B. corycaeus is much the deeper, darker-bodied fish. Prior to 2002 the family Badidae included just five species of which only B. badis and, to a lesser extent, Badis dario (referred to as B. bengalensis by some sources) were popular in the aquarium hobby. However an extensive rev...

Also known as the beacon tetra, this species is ubiquitous in most dealers' tanks and is one of the best choices for the newcomer to fishkeeping. It's both hardy and inexpensive. It has been popular in the hobby for several decades. There is a selectively bred albino form that has become popular in recent years, for which care is identical to the standard fish. There is possibly also a subspecies, H. ocellifer falsus that lacks the red spot at the caudal peduncle (the gold-coloured tai...

Its native rivers flow through one of the most densely-populated and industrialised parts of Brazil, and have suffered greatly from dam construction, water abstraction, pollution, introduced species (including over 40 exotic freshwater fishes in the rio Paraíba do Sul alone), and other forms of anthropogenic degradation. H. flammeus is now uncommon or even extinct across much of its putative natural range, and in Rio de Janeiro state only a handful of highly-fragmented populations remain at best, with the mo...

This species is one of the most popular Rift Lake cichlids in the hobby, due to its striking colouration and somewhat peaceful (for a mbuna) nature. It exists in many different colour forms in nature, and the ubiquitous "electric yellow" morph, so popular in the hobby, is actually one of the rarer forms in nature, with the blue and white variety being more widespread. Wild fish are correspondingly rare in the hobby, with the vast majority of specimens offered for sale being tank-bred. ...

Different populations vary in appearance somewhat (see image of Salween specimen for example), and L. leptocheilus may turn out to represent a group of closely-related species rather than a single taxon. The population from the Cambodian Mekong has been considered to represent a distinct species, Labiobarbus lineatus, although that name is currently a synonym of L. leptocheilus following Kottelat (2013). It is widely used in the ornamental trade, however.

This species has been introduced into many areas in Africa for commercial purposes, and it's had a hugely detrimental effect on local fish populations in some of these environments. The most notable case is that of Lake Victoria, where much of the endemic cichlid population has been wiped out. L. niloticus is thought to have directly contributed to the extinction of over 200 endemic species in the lake by predation, or outcompeting them for food. The IUCN have included it in their list of t...

One of the most popular Tanganyikan species in the hobby, N. leleupi is a stunning fish when in good condition. However, it is not as easy to maintain as its popularity suggests, due to its disagreeable attitude towards conspecifics and its sensitivity to deteriorating water conditions. It is a solitary species in nature, with male fish entering females' caves as they find them and spawning with receptive females. This explains the weak pair bond formed by spawning fish in aquaria and also ...

For a number of decades this species was thought to occur throughout much of Madagsacar's western slope but populations immediately to the north and south of the range described above (see 'Distribution') are currently considered to represent unidentified species, while a number of populations from the Mahavavy du Sud and Betsiboka riv...

The majority of original populations have already been extirpated due to introduction of invasive species such as Gambusia holbrooki and Poecilia reticulata, ongoing deforestation of the Ambohitra Massif, and physical diversion of the source of the Sakaramy River for domestic use by locals. An additional population may exist in a stream on the southern slope of the Ambohitra Massif on the road between Bobasokoa and Anivorano, near the village of Andranotohiliny, but this requires verification.

One of the most common and popular Cichlid species in the hobby, the vast majority of Kribensis (often simply called "Krib" by many fishkeepers) seen in the hobby today are captive bred and are far more adaptable in terms of water chemistry than the wild fish. They also tend to be less aggressive when breeding. An aquarium sport albino form is available and is fairly popular. This fish is one of the best choices for newcomers to both Cichlids and fish breeding, being of a manageable...

Quite widely distributed having been recorded from Brazil, Colombia, Peru and Venezuela. It's been collected from the upper parts of several major river drainages including the Río Negro, Río Orinoco (including the Río Inírida and Casiquiare canal) and Río Solimões. The type series was collected from 'Igarapé Préto', Brazil, said to be 60 kilometres to the south of the Colombian border city Leticia. Populations from Colombia and Brazil tend to be more intensely-coloured, and the Peruvian populations may apparently represent an undescribed species.

The genus Procatopus currently comprises half a dozen members (P. aberrans, P. lambertii, P. nimbaensis, P. nototaenia, P. schioetzi and P. similis), all of which are are non-annual species existing in permanent bodies of water. They are actually more closely related to the livebearing species of the subfamily Poeciliinae than the popular Aplocheilid killifish. None are particularly popular in the aquarium trade, although specialist dealers may have them available from time-to-time. Some such as...