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 | 2017-02-03
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
Research news | 2016-11-30
WorldFish partners with SwedBio to respond to a new regional coastal fishery policy in the Pacific
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...
2016 - Journal / article
Eco-certification has become an increasingly popular market-based tool in the endeavor to reduce negative environmental impacts from fisheries and aquaculture. In this study, we aimed at investigating which psychological consumer characteristics influence demand for eco-labeled seafood by correlating consumers’ stated purchasing of eco-labeled seafood to nine variables: environmental knowledge regarding seafood production, fam...
2015 - Journal / article
In their article “Global trends in antimicrobial use in food animals” (1), Van Boeckel et al. provide important insights into antimicrobial use in terrestrial animal production. Although aquaculture was deliberately excluded from their study, some extreme facts on antimicrobial use in aquaculture were mentioned. Here we briefly complement their study with more up-to-date information about the present use and trends of antimicr...
2015 - Journal / article
Nearly 40% of seafood is traded internationally and an even bigger proportion is affected by international trade, yet scholarship on marine fisheries has focused on global trends in stocks and catches, or on dynamics of individual fisheries, with limited attention to the link between individual fisheries, global trade and distant consumers. This paper examines the usefulness of fish price as a feedback signal to consumers a...