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Red king crab and snow crab have both become important species for the Norwegian seafood industry. Since the first commercial harvest of red king crab in 2002 and of snow crab in 2012, the Norwegian seafood industry has developed new technology and knowledge for handling these species. This includes new fishing gear, conditions for live storage and processing, handling of byproducts, and entrance into new markets. The total Norwegian quota for red king crab increased from 220 metric tons in 2002 to 2350 metric tons in 2017, with a free-red king crab harvesting zone to the west of the quota-regulated area to prevent further expansion of the crab. At present, there is no established quota for snow crab. In 2016, a volume of about 5300 metric tons of snow crab was landed in Norway. In 2016, the export of red king crab and snow crab in Norway amounted to 529 million and 338 million Norwegian Kroner, respectively. Based on regular surveys of crab populations in the Barents Sea, it is assumed that the volumes red king crab and snow crab will remain steady and increase, respectively. Thus, these industries will continue to be important to the Norwegian seafood industry.

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Aquaculture is a major contributor to global food production, but has attracted considerable controversy. Disagreements over the social and ecological impacts of aquaculture (positive and negative) have hindered further expansion of aquaculture production, particularly in wealthy democratic countries. This article presents findings from a series of workshops bringing international aquaculture scholars together from the natural and social sciences to examine and compare social-ecological challenges facing aquaculture development in five nations: Canada, the Faroe Islands, Iceland, Norway, and Sweden. This multinational comparison provides unique insights into common and particular challenges in aquaculture governancea dimension that is missing in current literature about the industry. A political ecology framework from the environmental social sciences is used to examine how natural and human phenomena interact to shape these challenges and frame the conflicts that often result. The analysis reveals a wide range of social-ecological factors limiting aquaculture expansion in the five countries, including access to suitable environments, interactions with other sectors, and policy and regulatory gapsnot only with respect to aquaculture, but also on related issues such as marine spatial planning and the involvement of indigenous peoples in decision-making. The findings provide preliminary guidance for future policy development and comparative aquaculture research. IntroductionAquaculture, the farming of aquatic animals and plants for private harvest, has grown substantially in recent decades and now plays a major role in the global food system. Like landbased agriculture, aquaculture takes multiple forms, from the small-scale stocking of ponds with herbivorous fish for local consumption, to the industrial-scale production of high-value species such as salmon, shrimp, and shellfish for international markets (FAO 2016). Global aquaculture production has grown at rapid rate, from 32 million tonnes in 2000 to 77 million tonnes in 2015 (Zhou 2017). With this growth have come new social and ecological challenges. In developing regions where small-scale freshwater aquaculture is common, issues such as landscape change, water quality, deforestation, and loss of wetlands have been identified as key problems (Bush and Marschke 2014). In wealthier countries, controversy has emerged over impacts on wild stocks and species, degradation of habitat, rural futures and economic restructuring, and legal and moral rights to aquatic spaces and resources (Young and Matthews 2010). These challenges

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