This paper presents different sorption refrigerator technologies for fishing vessels. The pressure-heat recovery and multi-step heat recovery processes are studied to improve the Coefficient of Performance (COP). Small-channel heat transfers are used to solve the problem of the performance degradation caused by fishing vessels' shaking. The results show that the multi-step heat recovery ammonia water sorption refrigerator has the highest refrigeration capacity per unit volume of 15.4 kW/m(3). (C) 2016 Elsevier Ltd. All rights reserved.