Tambaqui growth and survival when exposed to different photoperiods

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. KEY-WORDSColossoma macropomum, juvenile fish, photoperiod, growth. Crescimento e sobrevivência do tambaqui exposto a diferentes fotoperíodos RESUMO Investigou-se o uso de diferentes fotos períodos (iluminação) durante o crescimento de juvenis de tambaqui (Colossoma

Growing in the Dark Warmth: The Case of Amazonian Fish Colossoma macropomum

“…In the treatments where it was applied the natural photoperiod found by tambaqui in nature, the feed efficiency was compromised, as previously described by Aride et al (2006). Thus, in our study, the best feed conversion for the D-32 group may be associated with the fact that the animal is prepared to process the food near or at night.…”

Weight gain and morphometric growth of genetically improved tambaqui (Colossoma macropomum)

“…There was no significant difference among the experimental units and averages complied with the recommended range for the production of tropical fish, such as the tambaqui (BOYD, 1992;SIPAÚBA-TAVARES, 1995;ARIDE et al, 2006;RADÜNZ NETO, 2010).…”

Changes on physiological parameters of tambaqui (Colossoma macropomum) fed with diets supplemented with Amazonian fruit Camu camu (Myrciaria dubia)

“…These results differ from those observed for Sparus aurata fed different levels of vitamin C (25, 50, 100 and 200 mg/kg) (Henrique et al, 1998) and tambaqui fed 200 and 400 mg ascorbic acid/kg feed and exposed to hypoxia (Chagas and Val, 2006), where the evaluated specimens showed no differences in plasma glucose values during the feeding period. Aride et al, (2006) also found no significant differences in tambaqui specimens subjected to different photoperiods. According to Pickering and Pottinger (1995) and Reid et al, (1998), various species of fish exhibit primary responses to stress, such as increased circulating catecholamines and corticosteroids, thus triggering secondary effects related to energy requirements, such as increased blood glucose by glycogenolysis and gluconeogenesis.…”