Colossoma macropomum
(Cuvier 1818)
Common Names: black pacu (tambaqui, cachama, black fin pacu)
FROM FRANK MAGALLANES
Grows to 400 mm SL, the young spotted, adults plain with the fins dark-brown. Many synonyms exist; C. oculus and C. nigripinnis. The adipose fin is also rayed in this species. This species occurs in the Amazon, as well as the Orinoco basin. The species occurs in the Amazon and Orinoco basins. This group was revised by Antonio Machado-Allison (1982), also provided keys for species identification. This fish is frequently misidentified by fish and wildlife authorities as a red-bellied piranha when captured in U.S. waters.
Tambaqui growth and survival when exposed to different photoperiods
Paulo Henrique Rocha ARIDE1, Rodrigo ROUBACH2, Sérgio Ricardo NOZAWA3 and Adalberto Luís VAL2
1UNINILTON LINS. Toxicologia Ambiental. 69058-040, Manaus, AM. aride@inpa.gov.br
2 Instituto Nacional de Pesquisas da Amazônia - INPA, CP 478, 69011-970, Manaus, AM.
3 UNINILTON LINS. Expressão Gênica. 69058-040, Manaus, AM.
ABSTRACT
The use of different photoperiods (light) were investigated during tambaqui (Colossoma macropomum) juvenile growth under captivity. Light intensity tested was: continuous dark (24hrs without light), natural photoperiod simulation (10hrs of light and 14hrs without light) and continuous light (24 with light). No mortality was recorded among treatments. Significant differences was observed after 50 days of experiment among mean fish weight, fish kept under a continuous darkness showed a better specific growth rate (6.02%) when compared to control fish (natural photo period, 3.67%). Fish exposed to continuous light presented the lowest mean specific growth rate (2.04%). It is possible to improve tambaqui juvenile weight gain performance when kept under continuous darkness.
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