Uaru Fish -Cichlids of the Americas
Uaru Fish -Cichlids of the Americas
Uaru Fish -Cichlids of the Americas
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<strong>Uaru</strong> <strong>Fish</strong> -<strong>Cichlids</strong> <strong>of</strong> <strong>the</strong> <strong>Americas</strong><br />
At one time <strong>the</strong> uaru fish was called <strong>the</strong> poor man's discus" - but not any more.<br />
Wayne Leibel<br />
Click image to enlarge<br />
<strong>Uaru</strong> fernandezyepezi<br />
Photo courtesy Neale Monks. Throughout <strong>the</strong> 1960s and '70s, when only wild discus were available and usually sold<br />
for exorbitant sums <strong>of</strong> money, <strong>the</strong> uaru (pronounced "wahroo") or triangle cichlid fish was <strong>of</strong>ten referred to as <strong>the</strong> "poor<br />
man's discus" — <strong>the</strong>y were readily available as juveniles and subadults at less than one-third <strong>the</strong> price <strong>of</strong> wild discus, and<br />
<strong>the</strong>ir body shape and habits mimicked those <strong>of</strong> discus. These days, with <strong>the</strong> proliferation <strong>of</strong> discus hatcheries and <strong>the</strong> ready<br />
availability <strong>of</strong> reasonably priced captive-bred individuals, <strong>the</strong> discus might be more correctly called <strong>the</strong> "poor man's uaru!"<br />
Although sporadically bred, <strong>the</strong> availability <strong>of</strong> ei<strong>the</strong>r captive-reared stock or, rarer yet, wild imported uaru from Brazil, has<br />
nose-dived. Not surprisingly, <strong>the</strong>ir prices have gone up dramatically. Although lacking <strong>the</strong> brilliant iridescence <strong>of</strong> discus fish,<br />
uaru never<strong>the</strong>less remain highly desirable cichlids because <strong>of</strong> <strong>the</strong>ir interesting behavior and difficulty in spawning.<br />
How Many <strong>Uaru</strong>?<br />
In 1840, Johannes Heckel erected <strong>the</strong> genus <strong>Uaru</strong> and fur<strong>the</strong>r described <strong>the</strong> species amphiacanthoides, <strong>the</strong> large, brown<br />
pancake-like cichlasomine commonly sold as <strong>the</strong> "wahroo" or triangle cichlid in <strong>the</strong> hobby. Rachow (1927) reports that <strong>the</strong><br />
genus name derives from <strong>the</strong> native name for this fish: uara ura, which he suggests means "like a mirror," presumably<br />
referring to <strong>the</strong> fish's dinner-plate body shape.<br />
Fur<strong>the</strong>r, he suggests that <strong>the</strong> species name amphiacanthoides means "resembling Amphiacanthus, a genus <strong>of</strong> about 30<br />
species, chiefly herbivorous fishes from <strong>the</strong> Indian and Western Pacific Oceans." This marine genus is now known as<br />
Acanthurus, <strong>the</strong> surgeonfish, which <strong>Uaru</strong> species resemble both in body shape and in <strong>the</strong>ir preference for vegetable matter.<br />
Most hobbyists are probably familiar with uaru. In addition to <strong>the</strong>ir highly compressed, saucer-shaped bodies, which <strong>the</strong>y<br />
share with discus fish (and, to a lesser extent, severums), adults are notable for <strong>the</strong> conspicuous large black irregular<br />
triangular or wedge-shaped marking that extends along <strong>the</strong>ir flanks — just below <strong>the</strong> lateral line from <strong>the</strong> insertion <strong>of</strong> <strong>the</strong>ir<br />
pectoral fins back to <strong>the</strong> base <strong>of</strong> <strong>the</strong> tail fin. In addition, adult uaru sport a black spot or bar on <strong>the</strong> tail base, and a black<br />
"eyebrow" marking just above and behind <strong>the</strong>ir eyes (<strong>the</strong>y remind me <strong>of</strong> Groucho Marx's eyebrows).<br />
The base coloration is a pleasing brown that lightens to cream along <strong>the</strong> belly and chest. The unpaired fins are dark and<br />
<strong>of</strong>ten marked in black with iridescent blue lines, particularly on <strong>the</strong> spines <strong>of</strong> <strong>the</strong> anal fin and along <strong>the</strong> <strong>the</strong> margins <strong>of</strong> <strong>the</strong><br />
pelvic fins. Like discus fish, <strong>the</strong> eyes are usually bright red. Unlike discus and more like severums, <strong>the</strong> "pancake" body is<br />
<strong>of</strong>ten quite thick.<br />
<strong>Uaru</strong> can grow to at least 12 inches at full maturity. They hail from <strong>the</strong> Amazon and its tributaries, principally in Brazil (e.g.,<br />
<strong>the</strong> Rio Negro, and Rio Branco), as well as <strong>the</strong> Rio Tocantins/Rio Xingu system, and can <strong>of</strong>ten be found alongside discus<br />
and freshwater angelfish (according to Sterba 1962). Not surprisingly, <strong>the</strong>ir requirements in <strong>the</strong> aquarium are nearly identical<br />
with those <strong>of</strong> discus.<br />
As is <strong>of</strong>ten <strong>the</strong> case, <strong>Uaru</strong> amphiancanthoides was described independently, but later, by a host <strong>of</strong> ichthyologists. Synonyms<br />
include: Pomotis fasciatus Jardine 1843, <strong>Uaru</strong> obscurum Gün<strong>the</strong>r 1862, and Acara imperialis Steindachner 1879.<br />
Steindachner (1980) later waffled and put imperialis into <strong>the</strong> genus Heros (severum) and <strong>the</strong>n Astronotus (oscar).<br />
Incidentally, Pellegrin (1904), in reexamining and commenting on Steindachner's <strong>Uaru</strong> (Acara) imperialis, notes that <strong>the</strong><br />
largest specimen in his series was less than 2 inches. This would probably account for <strong>the</strong> coloration description ("5 lines <strong>of</strong><br />
small, sky-blue spots on body") typical <strong>of</strong> juvenile U. amphiacanthoides (see below). There are, however, at least two<br />
additional species <strong>of</strong> <strong>Uaru</strong> — U. fernandezyepezi, described by Stawikowski in 1989, and a third, an apparently undescribed<br />
species.<br />
<strong>Uaru</strong> fernandezyepezi (named after by <strong>the</strong> Venezuelan ichthyologist Agustin Fernandez Yepez, who died in 1977) was first
caught by Hans Kopke in 1988 in <strong>the</strong> Rio Atabapo, in eastern Colombia. This individual measured 9½ inches in length. It<br />
apparently is rare in nature (Andersen 1994), but has been recently imported live into Europe.<br />
If <strong>the</strong> photo <strong>of</strong> this freshwater fish that appears in Anderson (1994) is accurate, U. fernandezyepezi is very unlike U.<br />
amphiacanthoides. Instead <strong>of</strong> a large black triangle against a brown background, it apparently expresses a series <strong>of</strong> four<br />
dark vertical bars starting at mid-body, back to <strong>the</strong> tail and extending from <strong>the</strong> dorsal fin ventrally down to <strong>the</strong> anal fin.<br />
According to Andersen (1994) <strong>the</strong> fins are light brown and <strong>the</strong> dorsal fin is edged in red.<br />
The third, aseemingly undescribed species, was pictured in Stawikowski and Werner (1988; page 61) and again in Staeck<br />
and Linke (1985; drawing on page161). I have had four specimens <strong>of</strong> this fish once myself (1987).<br />
Ra<strong>the</strong>r than triangles, this species has large black rectangles on its flanks that begin just at, and not below, <strong>the</strong> lateral line,<br />
and <strong>the</strong> blotch on <strong>the</strong> base <strong>of</strong> <strong>the</strong> tail is a vertical band. The black eyebrow is lacking. There are also some indistinct<br />
vermiculaform markings on <strong>the</strong> snout, reminiscent <strong>of</strong> severum (H. severus). I have no location data on my own specimens,<br />
but nei<strong>the</strong>r do Stawikowski and Werner (1988) nor Staeck and Linke (1985 ). Regrettably, I never bred <strong>the</strong> fish, lost <strong>the</strong>m<br />
and have never seen <strong>the</strong>m again.<br />
In October 1996 I received a photo from Laif DeMason, proprietor <strong>of</strong> Old World Exotics in Florida, for identification purposes,<br />
which was published in Cichlid News (January 1997, page 36). It is clearly ei<strong>the</strong>r U. fernandezyepezi or a fourth undescribed<br />
species. It's reportedly from Brazil, making <strong>the</strong> former identification unlikely.<br />
In this photo, <strong>the</strong> fish displays two vertical black bands, one on <strong>the</strong> base <strong>of</strong> <strong>the</strong> tail and one about three-quarters <strong>of</strong> <strong>the</strong> way<br />
down <strong>the</strong> body (halfway between <strong>the</strong> middle and <strong>the</strong> base <strong>of</strong> <strong>the</strong> tail <strong>of</strong> <strong>the</strong> fish). There is a third indisdinct vertical band on<br />
<strong>the</strong> midline culminating in a dark black spot just below <strong>the</strong> insertion <strong>of</strong> <strong>the</strong> dorsal fin. Unfortunately, for this hobbyist, <strong>the</strong> fish,<br />
which had turned up at ano<strong>the</strong>r Florida importer, had long since been sold.<br />
<strong>Uaru</strong> in <strong>the</strong> Aquarium<br />
According to Sterba (1962) and Holly et al. (1941), this fish was first imported into Hamburg, Germany, in 1913. I found a<br />
picture (dated 1916 and signed by <strong>the</strong> artist) and short account <strong>of</strong> <strong>the</strong> "Keilfleckcichlide" (wedge-spot cichlid) in Rachow<br />
1927 (German book, translated into English), and a much longer account, again in Holly et al. (1941; German), in which <strong>the</strong>ir<br />
successful spawning is discussed. However, this fish is conspicuously absent from <strong>the</strong> American hobby literature.<br />
I can find no article or reference to it in ei<strong>the</strong>r Aquatic Life (Vol. 1 to 15, 1915 to 1932) or in The Aquarium (Vol. 1 to 17, 1932<br />
to 1948), <strong>the</strong> preeminent American hobby magazines <strong>of</strong> <strong>the</strong>ir time. No entry ever appears in Innes' Exotic Aquarium <strong>Fish</strong>es<br />
right through <strong>the</strong> 19th edition (revised) published in 1964. Recall that <strong>the</strong> discus, also described by Heckel in 1840, had<br />
made it into <strong>the</strong> American and German hobbies by <strong>the</strong> 1930s (see Leibel 1996b), so <strong>the</strong> uaru fish was definitely ignored by<br />
<strong>the</strong> American hobby despite being a long-term and welcome fixture in <strong>the</strong> German hobby. Perhaps <strong>the</strong> subtlety <strong>of</strong> its brown<br />
and black coloration was lost on American hobbyists more taken with <strong>the</strong> iridescent incandescence <strong>of</strong> discus. I would submit<br />
that this remains true, even today.<br />
Yet, <strong>Uaru</strong> amphiacanthoides is no less charming and interesting than ei<strong>the</strong>r <strong>the</strong> discus or <strong>the</strong> angelfish, and, in some<br />
respects, is even more interesting. Like discus, U. amphiacanthoides contact feeds its young. Unlike discus, this is not<br />
absolutely necessary for <strong>the</strong> successful rearing <strong>of</strong> fry, and is why uaru fish were successfully spawned well before discus.<br />
One unique aspect <strong>of</strong> <strong>the</strong>ir growth and development is that uaru have a distinctively different juvenile color pattern that<br />
changes dramatically as <strong>the</strong> fish reach sub-adulthood. Initially, <strong>the</strong> chocolate-brown base color is punctuated at regular<br />
intervals by rows <strong>of</strong> white spots — <strong>the</strong>re are no hints <strong>of</strong> <strong>the</strong> black flank wedges or <strong>of</strong> <strong>the</strong> Groucho eyebrows. This juvenile<br />
color pattern is not unlike that <strong>of</strong> <strong>the</strong> Tanganyikan cichlid Tropheus duboisi.<br />
As <strong>the</strong> fish nears 2 inches or so, <strong>the</strong> pattern begins to break up: <strong>the</strong> spots enlarge and <strong>the</strong> ground color lightens, until <strong>the</strong><br />
fish transforms (at about 3 to 4 inches) into <strong>the</strong> adult pattern. (So too, T. duboisi fry lose <strong>the</strong>ir beautiful spot pattern and<br />
ultimately develop a white or yellow vertical bar in <strong>the</strong>ir midsection.) This colorational metamorphosis is one <strong>of</strong> <strong>the</strong> added<br />
joys <strong>of</strong> obtaining and raising uaru juveniles to adulthood. As Sterba (1962) wrote, uaru fish are best treated like discus in <strong>the</strong><br />
aquarium. I refer you back to my article on wild discus in this magazine (Leibel 1996b) for details as to how to do so.<br />
In summary, however, <strong>the</strong>y need large aquariums (about 50 to 125 gallons) with well-maintained water. They should be kept<br />
warm (84 to 88 degrees Fahrenheit) and <strong>the</strong>re should be plenty <strong>of</strong> aeration. Although s<strong>of</strong>t, acid water is probably beneficial,<br />
it is not apparently necesssary: Nini Schultz (1988) was able to spawn <strong>the</strong>m repeatedly and successfully in water with a pH<br />
<strong>of</strong> 7.2, with slight hardness (120 parts per million).
They can be shy, so shelter in <strong>the</strong> form <strong>of</strong> submerged bog wood, along with dim lighting, is recommended. Provide some flat<br />
rocks to hold <strong>the</strong> egg plaque if spawning is a desired outcome.<br />
Unlike discus, live aquatic plants should be omitted as <strong>the</strong>se are enthusiastic herbivores! In fact, one <strong>of</strong> <strong>the</strong> requirements for<br />
successfully maintaining uaru is to provide adequate vegetable materials in <strong>the</strong>ir diets. This can be romaine lettuce,<br />
parboiled zucchini or any <strong>of</strong> a number <strong>of</strong> Spirulina-based disc foods (e.g., Wardley, Hikari) and flake foods (e.g., Tetra<br />
Dorogreen). Spinach is probably not a good idea on a regular basis because <strong>of</strong> <strong>the</strong> toxic oxalic acid found in <strong>the</strong>ir leaves.<br />
Excess duckweed, Java moss and water sprite works well, too.<br />
Of course, <strong>the</strong>se should supplement a rich base diet <strong>of</strong> prepared, frozen and even live foods. Johnson (1992) fed live<br />
earthworms, mealworms and trout chow, and no vegetable material directly. Quarles (1997) also omitted vegetable material<br />
and fed a mixture <strong>of</strong> blended beef heart and shrimp as a staple, with blackworms and adult brine shrimp as an additional<br />
treat. Both were able to spawn <strong>the</strong> fish successfully.<br />
Breeding can be touchy, and actually raising fry harder still. For starters, you need a pair, which is easier said than done!<br />
While some, including Sterba (1962) and Loiselle (1992), suggest that (<strong>the</strong> only way) one can sex adult specimens by<br />
"venting" <strong>the</strong>m (turning <strong>the</strong>m over and inspecting <strong>the</strong>ir urogenital openings), I have seen too many errors made by<br />
experienced hobbyists with South American cichlids to take this approach seriously. As <strong>of</strong>ten as not, when <strong>the</strong> tubes actually<br />
come down during a spawning, "George" becomes "Georgia." Which is okay, except that "Martha" may really be "Martha" —<br />
two spawning females! This is ano<strong>the</strong>r cichlid fish, like angelfish and discus, in which compatible all-female couples form<br />
and spawn, exchanging roles as egg-layer from spawn to spawn.<br />
Loiselle (1992) reports that some breeders maintain that males have somewhat more pointed s<strong>of</strong>t dorsal and anal fins than<br />
females, and a more rounded cranial pr<strong>of</strong>ile, but that <strong>the</strong>se differences are subtle. It has been suggested (Johnson 1992)<br />
that uaru fish can be sexed on <strong>the</strong> basis <strong>of</strong> eye color (red for males, orange for females). However, it has been <strong>the</strong><br />
experience <strong>of</strong> many successful uaru breeders that this system does not work (at least not for <strong>the</strong>ir fish).<br />
So, <strong>the</strong> recommendation? You guessed it — raise four to six or eight juveniles. Or, if adults are all that are available, buy<br />
several. As Schultz (1988) describes, when two fish constantly swim toge<strong>the</strong>r (she started with four adults), pair formation<br />
has occurred.<br />
Johnson (1992) describes <strong>the</strong> courtship behavior as consisting <strong>of</strong> lip-tugging, side-by-side swimming and mutual spawning<br />
site preparation. Again, all-female pairs may form, but with additional fish you have <strong>the</strong> opportunity <strong>of</strong> mixing and matching<br />
until you get fertile eggs.<br />
The o<strong>the</strong>r major problem in breeding uaru fish is that <strong>the</strong>y are notorious egg eaters. Often, one parent becomes <strong>the</strong><br />
chronically <strong>of</strong>fending partner. You can ei<strong>the</strong>r try to change partners or pull <strong>the</strong> rock and incubate <strong>the</strong> eggs artificially, as per<br />
angelfish (see Leibel 1996a). Johnson (1992) did just this with impressive success.<br />
I remember way back when I was a member <strong>of</strong> <strong>the</strong> Elm City Aquarium Society (New Haven, Connecticut) circa 1975. One<br />
member, Sue Rastad, an able aquarist who, like Nini Schultz, could spawn anything she put her mind to, was routinely<br />
getting uaru eggs only to have <strong>the</strong>m eaten within a few days (and prior to hatching). She told us that she used to stand<br />
guard over <strong>the</strong> eggs and beat <strong>the</strong> <strong>of</strong>fending parent on <strong>the</strong> head (gently) with a net if he/she approached <strong>the</strong> clutch, until she<br />
felt <strong>the</strong> eggs were old enough to snatch and rear artificially!<br />
Ano<strong>the</strong>r suggestion (made by Eberhard Schulze, 1988, in his book on discus) is to cover <strong>the</strong> spawn with wire mesh (held in<br />
place by suction cups) that will keep <strong>the</strong> parents from getting at <strong>the</strong> spawn but allow <strong>the</strong>m to fan <strong>the</strong> eggs to prevent fungus.<br />
Nini Schultz (1988) also reported that with <strong>the</strong> light kept on continuously, <strong>the</strong> spawners did not eat <strong>the</strong>ir eggs for at least<br />
three days (<strong>the</strong>y hatch on day four). Incidentally, uaru fish, like discus and angelfish, will spawn every five to seven days for<br />
long periods if <strong>the</strong> eggs are eaten or removed (N. Schultz 1988).<br />
Nini Schultz (1988) found, as is <strong>the</strong> case for discus fry, that newly hatched brine shrimp were too large for newly hatched<br />
uaru. Instead, and taking a cue from commercial discus hatcheries, she fed <strong>the</strong> free-swimming fry powdered (baker's) egg<br />
yolk four times a day for <strong>the</strong> first five days, at which time she switched <strong>the</strong>m to newly hatched brine shrimp.<br />
Johnson (1992), in contrast, reported that he was able to feed newly hatched brine shrimp nauplia immediately. So did<br />
Quarles (1997), but <strong>the</strong> size <strong>of</strong> Artemia nauplii varies dramatically depending on <strong>the</strong> origin <strong>of</strong> <strong>the</strong> eggs. Azuma (1973)<br />
reported that ei<strong>the</strong>r brine shrimp or hard-boiled egg squeezed through a cloth could be used as a first fish food for <strong>the</strong><br />
free-swimming, foraging fry.
Spawns are typically small for such a large fish, about 100 or so eggs (Stawikowski and Werner 1988). However,<br />
Johnson(1992) reported consistent spawn sizes <strong>of</strong> 200 to 300 eggs, once <strong>the</strong> breeders got going, for several spawnings.<br />
Azuma (1973) reported repeated spawns <strong>of</strong> 500-plus eggs. Quarles (1997) reports spawn sizes <strong>of</strong> "about 500 eggs."<br />
Schultz (1988) raised 96 in her first successful batch, with no mortalities. She raised many subsequent broods, and regularly<br />
supplied one East Coast wholesaler with juveniles for several years.<br />
Incidentally, she noted that growth was extremely rapid. After two weeks in a 10-gallon aquarium <strong>the</strong> fry were moved to a 20<br />
gallon for three more weeks, and <strong>the</strong>n a 40-gallon aquarium — with 20-percent water changes done twice a week throughout.<br />
At 10 weeks <strong>of</strong> age, <strong>the</strong> "babies" had reached 2 inches!<br />
This is good news if you intend to breed uaru commercially. A productive pair <strong>of</strong> uaru is a gold mine, given <strong>the</strong> constant<br />
demand for <strong>the</strong>se fish and <strong>the</strong> small number <strong>of</strong> fry <strong>the</strong>y produce despite <strong>the</strong>ir size.<br />
Incidentally, although <strong>the</strong>y can get aggressive with each o<strong>the</strong>r, uaru can be successfully kept in community situations with<br />
fish that share <strong>the</strong>ir maintenance requirements and are bigger than <strong>the</strong> uarus' mouths. In fact, Nini Schultz's uarus spawned<br />
in a 125-gallon community aquarium! See Leibel (1996b) for tankmate suggestions.<br />
Even if you are not intending to breed <strong>the</strong>m, uaru are worth keeping. If not for <strong>the</strong>ir subtle coloration (which I, for one, find<br />
attractive!), <strong>the</strong>n for <strong>the</strong>ir personalities. In many ways, uaru are like oscars (Astronotus sp.) behaviorally. That is, <strong>the</strong>y are<br />
deliberate in <strong>the</strong>ir movements and even appear to be thoughtful. It would seem that with bigger size goes bigger brains, at<br />
least in New World cichlids.<br />
References<br />
Andersen, K. 1994. Colombia: Back to Paradise. In The <strong>Cichlids</strong> Yearbook Vol. 4, A. Konings, ed. Pp. 78-83.<br />
Azuma, H. 1973. Spawning <strong>the</strong> triangle cichlid, <strong>Uaru</strong> amphiacanthoides. Tropical <strong>Fish</strong> Hobbyist (TFH) Vol. 22 (December):4<br />
et seq.<br />
Holly, M. A. Rachow and H. Meinkein, 1941. Die Aquarien Fische (looseleaf). Suppl 5. Pp. 831/832. (in German)<br />
Johnson, D. 1992. Spawning <strong>the</strong> "almost" discus. Aquarium <strong>Fish</strong> Intl. (AFI) 5(3):60-63.<br />
Leibel, W., 1996a. Goin' South: The Pancake Cichlasomines, Part 1 (Angelfish). AFI X(X):XX-XX.<br />
Leibel, W, 1996b. Goin' South: The Pancake Cichlasomines, Part 2 (Discus). AFI X(X):XX-XX.<br />
Loiselle, P. 1992. Cichlid Forum: Almost a discus. AFI 4(9):5-6.<br />
Pellegrin, J. 1904. Etudes des poissons de la famille des cichlides (in French). Mem Soc Zool France 16:41-399.<br />
Rachow, A. 1927. Tropical Aquariafish Catalog (in English). Aquarienfisch Im-und ExportCo., Hamburg, Germany. Pp 152.<br />
Schulze, E. 1988. Discus <strong>Fish</strong>, The King <strong>of</strong> All Aquarium <strong>Fish</strong>. Discus Limited. Bangkok, Thailand. Pp 139.<br />
Schultz, N., 1988. Breeding <strong>the</strong> <strong>Uaru</strong> amphiacanthoides. The Reporter: Bull North Jersey Aqua Soc. July:XX-XX.<br />
Staeck, W. and H. Linke. 1985. Amerikanische Cichliden II GrosseBuntbarsche (in German). Tetra Verlag, West Germany.<br />
Pp. 164.<br />
Stawikowski, R. and U. Werner. 1988. Die Buntbarsche der Neuen Welt:Südamerica (in German). Reimar Hobbing Verlag,<br />
West Germany. Pp. 288.<br />
Sterba, G. 1962. Freshwater <strong>Fish</strong>es <strong>of</strong> <strong>the</strong> World (English translation). Pet Library, Ltd., New York. Pp. 837.<br />
Quarles, J. 1997. <strong>Uaru</strong> amphiancanthoides: The Poor Man's Discus. TFH 45(7)(March):116-123.