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Open Access PDF - Sven Kullander

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SL from same sample. It is not obvious to what<br />

extent respectively sexual dimorphism, ontogenetic<br />

change of colour pattern and state of preservation<br />

contribute to variation in expression of<br />

light spots on head and body.<br />

Specimen 298 mm SL, apparently a breeding<br />

female, light greyish with intense contrasting<br />

blackish vertical bars without light margins. Black<br />

spots on head behind eye prominent; two small<br />

black spots on anterior part of caudal peduncle.<br />

Caudal spot ringed with brilliant white spots, not<br />

seen in any other specimen. Spinous dorsal fin<br />

uniformly black.<br />

Largest specimen examined, 430 mm SL, male<br />

with small soft nuchal hump, agreeing largely in<br />

colour with specimens half its size. Ground colour<br />

light brownish, with lighter underside and vertical<br />

bars prominent. White spots on side and head<br />

absent. Fins immaculate save for caudal ocellus.<br />

Live colouration. Photos are available of transplanted<br />

fishes from Brazilian dams, a fresh captured<br />

specimen from the Araguaia (Stawikowski<br />

& Werner, 2004: 38), as well as various sport fishing<br />

magazine photos without locality information<br />

and illustrated here by aquarium specimens<br />

(Fig. 54). General body colour varies from pale<br />

grey (usually) to yellow, with contrasted black<br />

bars. Bars 1a and 2a usually slightly narrower or<br />

paler than bars 1-3. Light ring around caudal<br />

blotch always silvery to white. Very large males<br />

(40-50 cm estimated size) with reddish, prominent<br />

nuchal protuberance, and white spots absent from<br />

fins. Other specimens, estimated size 30-40 cm<br />

SL, possibly females, feature small white spots<br />

on spinous and soft dorsal fins and upper half of<br />

caudal fin as well as on side of head; body side<br />

with or without light spots; anal and pelvic fins<br />

and lower half of caudal fin yellowish to reddish.<br />

Geographical distribution. Natural occurrences<br />

are recorded from the lower (Rio Itacaiunas,<br />

Marabá, Itupiranga), and upper Rio Tocantins<br />

(Rio Paranã), as well as in the Araguaia drainage<br />

(Cocalinho and Rio das Mortes) (Fig. 9).<br />

Cichla piquiti is extensively stocked in reservoirs<br />

in the Paraná river drainage, and the States<br />

of Minas Gerais and São Paulo. Kelber (1999) lists<br />

tucunaré azul from the Itaipu, Porto Primavera,<br />

Jupiá, Três Irmãos, Ilha Solteria, São Simão, Jaguara,<br />

Estreito, Peixoto, Furnas, Avanhandava, and<br />

Promissão dams in the Rio Paraná drainage, the<br />

Ichthyol. Explor. Freshwaters, Vol. 17, No. 4<br />

349<br />

Tres Marias dam in the Rio São Francisco drainage,<br />

and the Serra da Mesa dam in the Rio Tocantins<br />

drainage, as well as from the Rio Piquiri<br />

in the upper Rio Paraguay drainage. The tucunaré<br />

azul corresponds to C. piquiti, according to photographs<br />

provided by D. Kelber. Photos of large<br />

adults were made available by D. Kelber from<br />

Tres Irmãos (Rio Tietê), collected in 1995, and<br />

Itumbiara (Rio Paranaíba). Preserved material is<br />

available from Embarcação and Bocaina, also in<br />

the Rio Paranaíba drainage.<br />

A specimen of C. piquiti from Itiquira on the<br />

Rio Piquirí in the Rio Paraguay drainage was<br />

sampled already in 1980, although Nascimento<br />

et al. (2001) date the first introduction of Cichla<br />

(presumably C. piquiti) into the Piquirí to 1982.<br />

Nascimento et al. (2001) surveyed extensively the<br />

Piquirí and São Lourenço rivers between 1992<br />

and 1995 but found Cichla only in the Rio Piquirí.<br />

Marques & Resende (2005) extended the distribution<br />

to the Pantanal just north from Corumbá.<br />

Cichla piquiti was found together with C. kelberi<br />

in the Rio Limoy (Paraguay) (Figs. 9, 23). Although<br />

there are practically no fish collections available<br />

from the Rio Paraná in the region of the Itaipu<br />

dam before the construction of reservoirs, introduction<br />

seems more likely than natural occurrence.<br />

Etymology. The species epithet piquiti is a Tupi-<br />

Guarani word meaning striped, and is here used<br />

as a noun in apposition.<br />

Local names. Recorded as tucunaré by Costi et<br />

al. (1977) and as tucunaré azul by Kelber (1999).<br />

Notes. Cichla piquiti is known as tucunaré azul<br />

among Brazilian recreational fishermen (Kelber,<br />

1999), with reference to an overall light bluish<br />

impression of living specimens.<br />

Cichla piquiti bears some resemblance to<br />

C. ocellaris and C. nigromaculata in the presence of<br />

five wide vertical bars on the side, but ocellar<br />

markings are absent from the side, and the vertical<br />

bars reach more ventrally on the side. Cichla<br />

piquiti can be distinguished from the sympatric<br />

C. kelberi by the absence of light spots on the anal<br />

fin, presence of bars 1a and 2a, absence of abdominal<br />

blotches, and absence of occipital bar. It<br />

may be confused at small sizes with C. pinima,<br />

which also occurs in the lower Rio Tocantins, but<br />

the two species appear to be only narrowly parapatric<br />

(cf. Figs. 23 and 60).

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