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 | 2018-05-28
Study predicts size of world oceans environmentally suitable to aquaculture and which areas currently most under-utilised
Research news | 2017-11-21
Large-scale changes in Arctic marine food web can be expected within 50 years, some good, but in the long run several critical
Research news | 2017-10-19
The starting point for a rethink on how we produce our food
Research news | 2017-08-21
Feed resources is the big challenge for expansion of marine aquaculture - not lack of suitable ocean space
2018 - Journal / article
By moving away from coastal waters and hence reducing pressure on nearshore ecosystems, offshore aquaculture can be seen as a possible step towards the large-scale expansion of marine food production. Integrated multi-trophic aquaculture (IMTA) in nearshore water bodies has received increasing attention and could therefore play a role in the transfer of aquaculture operations to offshore areas. IMTA holds scope for multi-use o...
2018 - Journal / article
Aquaculture has grown rapidly over the last three decades expanding at an average annual growth rate of 5.8% (2005–2014), down from 8.8% achieved between 1980 and 2010. The sector now produces 44% of total food fish production. Increasing demand and consumption from a growing global population are driving further expansion of both inland and marine aquaculture (i.e., mariculture, including marine species farmed on land). Howev...
2017 - Other publication
As authors of " China's aquaculture and the world's fisheries " (Cao et al., Science, 2015), we would like to dispute several claims presented in " A revisit to fishmeal usage and associated consequences in Chinese aquaculture " (Han et al., Reviews in Aquaculture, 2016), as the latter seriously misrepresents the intent and substance of our Science paper. In their review, Han and colleagues argue that although China's aquacult...