Aquaculture can have negative environmental impacts, adding to the suite of anthropogenic stressors that challenge coastal ecosystems. However, a growing body of scientific evidence indicates that the commercial cultivation of bivalve shellfish and seaweed can deliver valuable ecosystem goods and services, including provision of new habitats for fish and mobile invertebrate species. We completed a systematic literature review of studies focused on understanding habitat-related interactions associated with bivalve and seaweed aquaculture, and a brief meta-analysis of 65 studies to evaluate fish and mobile macroinvertebrate populations at farms and reference sites. Bivalve and seaweed aquaculture were associated with higher abundance (n = 59, range: 0.05× to 473×, median lnRR = 0.67) and species richness (n = 29, range: 0.68× to 4.3×, median lnRR = 0.13) of wild, mobile macrofauna. Suspended or elevated mussel and oyster culture yielded the largest increases in wild macrofaunal abundance and species richness. We describe the major mechanisms and pathways by which bivalve and seaweed aquaculture may positively influence the structure and function of faunal communities-including provision of structured habitat, provision of food resources and enhanced reproduction and recruitment-and identify the role of the species cultivated and cultivation gear in affecting habitat value. Given the continued deterioration of coastal habitats and increasing investments into their restoration, understanding how industry activities such as aquaculture can be designed to deliver food within ecological limits and have positive influences on ecosystem goods and services is essential in ensuring ecological, social and economic objectives can be achieved.

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Ecohistories of aquaculture suggest that aquaculture is a natural part of human development throughout history and that modern, industrial aquaculture could strengthen its social and ecological roots by articulating its evolution along a sustainability trajectory and by adopting fully the Food and Agriculture Organization (FAO) ecosystems approach to aquaculture (EAA; <xref ref-type="bibr" rid="bib121">Soto et al., 2008</xref>). The EAA creates a new code for global aquaculture development, combining into one common framework the two most important social‐ecological trajectories for global aquaculture—aquaculture for the world’s rich and aquaculture for the world’s poor. Knowledge of the rich archeology and anthropology of aquaculture connects this FAO code to antiquity, creating a single development pathway for aquaculture throughout human history. Without widespread adoption of an EAA, <xref ref-type="bibr" rid="bib50">FAO (2009)</xref> projections of aquaculture development over the next 30 years may provide a far too optimistic scenario for its global growth. In this regard, aquaculture over the last 20 years has been criticized as lacking adequate attention and investment in developing grassroots, democratic, extension processes to engage a broader group of stakeholders to evolve the “blue revolution.” As an example, there has been a failure of fisheries and aquaculture to plan together to ensure sustainable supplies of seafood—the world’s most valuable proteins for human health—for seafood-eating peoples. Nonfed aquaculture (seaweeds, shellfish) has received worldwide attention for its rapid movement toward greater sustainability, which has led to more widespread social acceptance. For fed aquaculture, recent trends analyses have suggested that aquaculture is turning from the ocean to land-based agriculture to provide its protein feeds and oils. As such, more sophisticated, ecologically planned and designed “aquaculture ecosystems” will become more widespread because they better fit the social‐ecological context of both rich and poor countries. Ecological aquaculture provides the basis for developing a new social contract for aquaculture that is inclusive of all stakeholders and decision makers in fisheries, agriculture, and ecosystems conservation and restoration.

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