International Journal of Aquaculture, 2025, Vol.15, No.6, 287-297 http://www.aquapublisher.com/index.php/ija 292 pressure (Berman, 2024). Looking ahead, the community that is more flexible and diverse economically and more inclusive and cohesive socially is more likely to remain invincible in the development process of sustainable fisheries. 6 The Integration of Aquaculture and The Blue Economy 6.1 Development trends and significance of sustainable aquaculture Nowadays, aquaculture is no longer a niche industry but has become one of the world's fastest-growing food production sectors. Aquaculture has played the role of a "pressure relief valve" in easing the pressure on wild fisheries, and at the same time, it has played a key role in meeting the protein demand brought about by the rapid population growth. Over the past few decades, the livestock industry has undergone earth-shaking changes, ranging from output to technology and management concepts. Overall, freshwater aquaculture is considered to have greater potential in terms of food security and price affordability, while mariculture is often incorporated into the grand narrative of "blue growth" and linked to goals such as Marine economy, ecological conservation and nutritional health (Garlock et al., 2024). However, some studies have pointed out that the "halo" of Marine fish farming might have been exaggerated. Especially the farming of high-value carnivorous fish, its profits are often concentrated among high-income groups, and its contribution to the food security of low-income groups is limited (Belton et al., 2020). Therefore, the future development of aquaculture cannot merely focus on economic growth; it must also take into account ecological and social balance. The investment direction should be more inclined towards those affordable, sustainable and truly people-benefiting breeding models (Wang and Wu, 2025). 6.2 Environmental impacts of aquaculture and mitigation measures The rapid expansion of aquaculture has brought considerable yields, but it has also been accompanied by environmental pressure. Problems such as habitat destruction, eutrophication pollution, microplastics and antibiotic residues have been frequently mentioned in recent years. Aquaculture wastewater often contains organic matter, heavy metals and even pathogenic microorganisms. If not properly treated, it will cause the surrounding water bodies to be overburdened. Among them, the problem of microplastics is particularly intractable - it may enter the aquaculture system from the external environment or originate from the aquaculture process itself, posing a potential threat to the health and growth of fish, and even human food safety. To alleviate these problems, the industry is trying every possible way to introduce new measures: technologies such as recirculating aquaculture systems, biological filtration treatment, and ecological purification zones have been successively launched to improve wastewater treatment efficiency and reduce emissions (Liu et al., 2024). Meanwhile, feed formulas are also being innovated. For instance, single-cell protein is being used to replace part of fish meal and fish oil, and the multi-nutrient-level integrated aquaculture (IMTA) model is widely adopted to achieve ecological circulation through "waste reuse". Overall, for the livestock industry to achieve truly sustainable development, technological progress alone is not enough. Stricter regulations, more meticulous management, and continuous policy support are also required (Garlock et al., 2024). 6.3 Case analysis: norwegian salmon farming and sustainable certification mechanism If one is looking for a model of aquaculture that combines efficiency and environmental protection, the salmon farming industry in Norway is almost an unavoidable example. This industry is renowned for its strict environmental standards, advanced feed technology and highly automated production systems. Its performance in terms of energy consumption, utilization rate of biological resources and greenhouse gas emissions is far superior to that of similar industries in many countries. Norwegian aquaculture enterprises generally adopt third-party sustainable certification mechanisms, such as Marine Stewardship Council (MSC) certification and Aquaculture Stewardship Council (ASC) certification. These certifications prompt enterprises to continuously improve in environmental and social governance (ESG), and also enhance the transparency of the management process (Van Putten et al., 2020). Although certification does not always bring about a significant economic premium, it enhances the reputation of the product in the international market and also strengthens public trust. Norway's experience shows that only when a sound legal system, scientific regulatory methods and appropriate market incentives are combined can the aquaculture industry truly be both sustainable and competitive.
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