Desorption isotherms at 25°C and 43°C and adsorption isotherms at 25°C were determined for salted and unsalted female roe of mullet (Mugil cephalus). Isotherms for ground white muscle of mullet were also determined for desorption at 25"C, 43'C, and 54.5'C, and for adsorption at 25'C. Adsorption-desorption hysteresis was evident for the sigmoid shaped isotherms. At 45°C and 15% RH, and also at 45'C and 25% RH, mullet fillets dry almost four times faster than mullet roe. An air temperature lower than 45°C should be used to obtain an acceptable color for the roe.