For the development of Croatian fisheries and aquaculture, the State Budget of the Republic of Croatia has provided financial resources for the implementation of structural support to fisheries through which various projects in fisheries are co-financed. As a full member state of the European Union, the Republic of Croatia is entitled to have support from the European Maritime and Fisheries Fund (EAFRD), the European Union's financial instrument to help achieve the objectives of the Common Fisheries Policy (CFP) for the 2014-2020 programming period. The measure "Productive investments in aquaculture" aims to strengthen the competitiveness and sustainability of enterprises, protection and restoration of aquatic biodiversity and the promotion of resource-efficient aquaculture. In Croatia, three tenders related to this measure were conducted, in 2016, 2017 and 2018. The aim of this research is to investigate the implementation of the measure "Productive investments in aquaculture" in the Republic of Croatia, i.e. to investigate the number of applicants by counties, the purpose of investments and to investigate the difference between applied and approved projects and the most common reasons for rejection. From the results of the research it can be concluded that according to the number of registered users, the largest number of claims for support for the analyzed measure comes from the Adriatic region. Most of the claims through the three tenders were approved and for those that were not approved the reasons were: not submitting the documentation within the publicly announced deadline, lack of benefits, financial unsustainability of the project and incomplete claim for support. The most common reasons for applying for the measure "Productive investments in aquaculture" are investments in various "simple" equipment (nets, cages, pontoons, buoys, etc.) and also for the reconstruction / construction of existing and new farms / hatcheries, the purchase of specialized vehicles with refrigerators that are necessary for the delivery of goods to customers and in the equipment needed for the operation of storage facilities (refrigerators, work machines, etc.). The biggest problems are in freshwater fisheries which has a significant decline regardless of support measures. Freshwater fisheries policy should be focused on providing support for development projects for processing and placing fish on the market, financially relieve fisheries and aquaculture from various water charges, solving agricultural land issues, ensure traceability, originality, biodiversity.