Fish as food has been widely used, and as its consumption is increasing, the efficiency of fish production companies needs to be increased as well. Fish production may consist of many processes, depending on the type of fish products they produce. Based on this, the increase in the efficiency of the whole company could be expensive, especially for small size companies, whose revenues per year are rather small. Therefore, to evaluate and understand which part of the company is the least efficient and needs to be improved first to have the highest increase in the efficiency of the company, the decision making method needs to be used for the evaluation. In this research, the method MULTIMOORA was chosen to evaluate the specific company’s production efficiency. The results have shown that fish preliminary processing is the least efficient process for the chosen case study. Recommendations for improvement the efficiency of the least efficient stage have been developed, therefore improving the efficiency for the whole company.