Resumen

KLEIN, Sidnei et al. Additives in the water during transportation of Piaractus mesopotamicus: Effects of survival rates after stocking in cages. Zootecnia Trop. [online]. 2013, vol.31, n.3, pp.255-257. ISSN 0798-7269.

The aim of this study was to assess the effect of the inclusion of additives into the water during transportation of juvenile pacu (Piaractus mesopotamicus) on the survival rate of fi sh once they are transferred and stocked in cages. Eight hundred fi sh of approximately 30 ± 1.75 g/fi sh of body weight were fasted for 24 h and then distributed into 20 plastic bags of 30 l (40 fi sh per bag). Each bag was then placed in a plastic container. The transportation period lasted for 2 h. The additives and concentrations used in the present study were: salt (8 g/l), fl orfenicol (0.01 g/l), oxytetracycline (0.001 g/l) and a combination of salt (8 g/l) + gesso (1 g/l). A control treatment (with no addition of additives) was included in the study. Water quality parameters such as dissolved oxygen, oxygen saturation, pH, temperature, nitrite and ammonia were measured at the beginning and at the end of the transportation process. The use of additives in the water during transportation of pacu did not have a signifi cant (P>0.05) effect on the mortality of fish once they were stocked in cages. The results from the present study highlight the ineffi ciency of the addition of these compounds in the water during transportation of pacu.

Palabras clave : aquaculture; chemical additives; antibacterial; good management practices; pacu.

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