About 85% of the Mediterranean and Black Sea stocks assessed are fished at biologically unsustainable levels (FAO, 2016). The experience of EU fisheries management is unique in its scope and ambition, in that it represents the only example of reconciling the concerns of a variety of coastal countries and eco-regions with diverse, if not divergent, interests into a Common Fisheries Policy, the CFP. The last revision, after adoption and several other revisions of the CFP is referred to as the 2013 CFP throughout the document. It is notable that experiences drawn from other countries' fisheries management have been considered to shape the 2013 CFP and these will likely be accounted for in reviewing future performance (Marchal et al., 2016).

The EC and GFCM are promoting a regional approach to fisheries management in the Black Sea. GFCM (2015) has adopted measures to prevent, deter and eliminate illegal, unreported and unregulated fishing in turbot fisheries in the Black Sea as well as management measures for dogfish. Both sets of measures entered into force were reinforced with additional management measures aiming to further protect the stocks in danger (GFCM, 2016). Yet the regulated stocks in EU waters represents very low percent from the total catch in Black Sea (STECF, 2015; FAO, 2016). For example, sprat catches in EU waters were estimated for 2012–2014 between 4 and 14% and 4.6–7% for EU share of turbot catches. This opinion aims to underline the efforts toward fishery management improvement in the Black Sea in the last years but also to highlight the existing gaps and challenges in sustainable management of marine living resources in the region.

Experience with fisheries management worldwide shows that in order to successfully manage the renewable resources of a marine area, compliance of all parties harvesting common resources to a common framework and their agreement on common objectives are both required. The parties should agree on compatible, effective and cost-effective regulations, on the allocation of resources, and on details of implementation of a common fisheries management regime outside territorial waters. These details should be spelled out explicitly in a management plan, which should be upgraded at intervals of 5–10 years. These activities should be reported on following an uninterrupted annual cycle of meetings between the parties concerned, including permanent working parties of national experts, panels on special issues, and commissions made up of accredited government representatives (Caddy, 1999). Some targeted species, such as shellfish, may be relatively static and for management purposes considered to be fully resident in national waters. However the major capture fisheries in the Black Sea migrate within the Black Sea, and are shared with other Black Sea stakeholders. The difficulty of managing fisheries is particularly reflected in the targets assigned to conservation objectives and how management actions are taken to meet these objectives in the short-medium term through to the long term. However, it is typical of political systems that the short-term view is prioritized over the long term (Holden, 1994). Proper management of shared stocks must involve negotiation with stakeholders throughout the range of the species. International agreements and national initiatives may force countries to prepare common fisheries management plans in near future. So, every country should be ready for such actions (Duzgunes and Erdogan, 2008). For a number of reasons which will be alluded to in this text, the Black Sea fisheries community has not been successful in implementing such cooperative activities under all of the above headings, or in “closing the circle” by putting together a working management cycle (Caddy, 1999). The GFCM focused on work toward the adoption of specific recommendations to revert the negative situation of fisheries in the region. However, the information on the status of Black Sea stocks is sparse, with few stocks being regularly assessed and with short time series for these assessments. There are still important uncertainties in the different stock assessments (e.g., estimation of total catches which also includes discards and IUU fishing activity, problems with the coverage of fisheries independent surveys, etc.). Furthermore, the Black Sea is one of the world's most isolated seas from the major oceans and it is the largest anoxic body of water on the planet. This sea is under heavy anthropogenic stress and its marine living resources need protection. Considering the particular characteristics of this sea and the specific challenges it faces in developing management advice, an ecosystem-based management approach that acknowledges the peculiarities of this sea is called for (GFCM, 2016). The level of exploitation varies in the years, as the fishing effort (Van Hoof, 2010) and fishing mortality have been changed during different periods with regards the changes in ecosystem and economic reasons, mainly. As regards the important key species in the Black Sea ecosystem, the measures for sustainable utilization must include wider ecosystem considerations. In this view, measures that advice incorporation of ecosystem approach and rules and guidelines provided by “precautionary approach” (FAO, 1996) have to be taken into account in proper management of the key fish populations (Raykov and Zlateva, 2015).

The term “management” usually is interpreted as series of regulatory measures introduced in the fishery practice with no doubt, positive influence on the general condition of marine living resources. On the other hand, similar restrictions could not lead conceptually to the “management policy” if they are not systemized with clearly formulated aims and prerogatives. In the presence of introduced “closed area,” ”closed season,” ”minimum mesh size,” and other regulations, altogether all of these measures could not serve as restrictions over the yield capacity, i.e., could not influence the fishing effort. The main priority in such a conception is a precautionary approach and responsible fishery practice in force. It could “work” properly with quota principle implementation, together with more effective system control. It is hard for any single country to follow these regulations and it is harder for all Black Sea countries to do so, because they are exploiting resources from shared fish stocks. In order to have an effective management on these stocks, joint stock assessments and co-operated fisheries management plans are needed. On this basis, the allocation of the catches for the separate Black Sea country could be established. Hence, it could be assumed that management of the marine living resources shall be fulfilled in its incomplete form, under the national jurisdiction prescript, as they are. The future of fisheries management in Black Sea is intrinsically linked with the setting of cross-sectoral “Maritime Policy” and “Marine Strategy Framework Directive” (EC, 2008) which deal with the cumulative impact of human activities. Implementation of management procedure involves the practical interpretation of objectives and procedures, and implementation of instructions for compliance, fishery monitoring and enforcement. The public and industry are more inclined to support measures upon which they have been consulted, so public participation at the implementation phase is critical. Public advertising of issues may help in this regard. Peer review of assessments and transparency in the process prevent errors (Pilling et al., 2008). In the Black Sea region the ecosystem approach has not been systematically applied in management, neither it has been previously recognized as a needful and inevitable framework to sustain healthy environment. The scientific message of complexity of ecosystems should reach the decision makers in a way raising their awareness on the necessity to manage the ecosystems in their integrity of health, services and goods. There is an increasing need for adoption of the ecosystem approach to exploitation of marine natural resources to promote ecological, environmental, economic, and social sustainability and preserve biodiversity in the Black Sea region.

The lack of common fisheries management and management plans, overexploitation and unknown use of the resources, lack of bio-economic analyses, significant loss of revenue and unsustainable development are among most serious problems facing Black Sea fisheries.

As regards Black Sea, it is more properly to put the accent on the separate regulations of the fishery, instead of its integral management. These regulations concern in very small extension the shared fish stocks, which are exploited without sufficient control. The future of fisheries management in Black Sea is intrinsically linked with the setting of cross-sectoral Maritime Policy and Marine Strategy Framework Directive which deal with the cumulative impact of human activities. Major efforts for multilateral cooperation among the riparian countries will be needed in order to improve the governance of the shared and migratory stocks in long term.

VR and ED: Substantial contributions to the conception or design of the work; or the acquisition, analysis, or interpretation of data for the work; Drafting the work or revising it critically for important intellectual content; Final approval of the version to be published; Agreement to be accountable for all aspects of the work in ensuring that questions related to the accuracy or integrity of any part of the work are appropriately investigated and resolved.