Key words: Aquaculture, Coastal ecosystems, ecosystem services, ecosystem functions, ecosystem valuation, biodiversity, resilience, environmental impacts and sustainability of aquaculture, integrated aquaculture systems, mangroves.
Troell is a system ecologist mainly working with environmental problems associated with aquaculture. This work focuses on inter-linkages between aquaculture and fisheries, on different spatial scales.
Practical fieldwork has mainly been conducted in developing countries (both tropical and temperate) and involved coastal systems as well as freshwater systems. He is currently doing work in India and Cambodia, where he studies how aquacultures allocation of low valued fish resources affect poor peoples ability to access cheep fish. In India he studies coastal fishery resources and coastal communities, and in Cambodia the Mekong fishery and rural inland communities (Sida Project).
A further area of interest is developing integrated cultivation techniques. This work started with coastal open-water aquaculture in Chile, and at present he is involved in works on land-based abalone farms in South Africa (Sida Project). The systems he tries to develop build on using seaweeds as biofilters, with the ultimate aim to increase environmental and economic performance.
A key question is what role these systems can play in future development of aquaculture, i.e. considering the challenges we face with limited resources and degrading environments. Also within this concept he has a minor part in a EU project where peri-urban mangroves are evaluated out from their biofiltering capacity. This work has besides studying nutrient dynamics also a component where socio-economic benefits are evaluated (including estimation of ecosystem goods and services generated from the mangroves).
Troell is also more generally working with ecological and socio- economic evaluation of ecosystem goods and services generated from tropical and temperate coastal systems. The latest work involved identification of goods and services from some Swedish key coastal habitats, and how to value these (SEEPA).
He has since 1991 been teaching and acting as course leader for marine and freshwater ecology courses. He has regular and occasional teaching assignments on various courses (University level teaching; SU, UmeåUniv., SLU, KTH, Södertörn).
He is a course leader for PhD certificate course (Ecology and economic management, 4 cr), given by The Beijer Institute and has taught ecology in a Sida financed teaching and training programme on environment and development issues for university teachers in economics in developing countries.
Research news | 2017-06-07
New study introduces the 'seafood gap', the forgotten freshwater use in seafood production chains
Research news | 2017-02-03
Recent Science paper on China’s aquaculture industry met with criticism from peers
Research news | 2017-02-02
Stockholm Resilience Centre and ReAct join forces on the global antibiotic resistance challenge
Research news | 2016-12-20
New study looks at how shocks like political change, natural disasters, diseases and overfishing have affected capture fisheries and aquaculture worldwide
2017 - Journal / article
Marine ecosystem science has developed since the 1940s, when humans obtained the ability to spend substantial time underneath the surface of the ocean. Since then, and drawing on several decades of scientific advances, a number of exciting research frontiers have emerged. We find: Understanding interacting drivers of change, Identifying thresholds in ecosystems, and Investigating social-ecological dynamics to represent particu...
2017 - Journal / article
Freshwater use for food production is projected to increase substantially in the coming decades with population growth, changing demographics, and shifting diets. Ensuring joint food-water security has prompted efforts to quantify freshwater use for different food products and production methods. However, few analyses quantify freshwater use for seafood production, and those that do use inconsistent water accounting. This inh...
2016 - Journal / article
Sudden disruptions, or shocks, to food production can adversely impact access to and trade of food commodities. Seafood is the most traded food commodity and is globally important to human nutrition. The seafood production and trade system is exposed to a variety of disruptions including fishery collapses, natural disasters, oil spills, policy changes, and aquaculture disease outbreaks, aquafeed resource access and price spike...
2016 - Journal / article
The Perspective on food sustainability (T. Garnett, 16 September, 353/6305) gives valuable insights related to links between dietary choices, environmental impacts and health. Substituting meat with fish could, as stated, only result in a transfer of impacts. If, however, fish is caught sustainably, respecting biological limits and using smart fishing methods, capture fisheries can produce low-impact food without requiring lan...