Fish were food restricted for 48 h prior to the transport. One
hundred-twenty matrinxãs (mean body weight 1.0 kg ± 0.2
SEM) were transported in four 200-l plastic tanks for four hours
on a pickup truck. Each tank hauled 30 fish (150 kg.m-3) at
different NaCl concentrations: 0.0, 1.0, 3.0, and 6.0 g/l. Water
temperature, pH, un-ionized ammonia nitrogen (NH3-N), CO2
and oxygen were measured every 30 min during the transport.
Oxygen levels were maintained above 6 mg.l-1 by injection of
liquid oxygen.