On arrival, ornamental fish should be allowed to recover from transport stress in tanks and acclimate to local water conditions before being distributed to retailers. The acclimation operation includes floating sealed bags in recovery tanks until the temperature
difference between the transport water and the recovery water is less than 2 1C. This may take about 30 min for atemperature di¡erence of 4^5 1C. The pH and hardness of the recovery water should also be close to the optimal values for the respective species.