Åsa Strand

Åsa Strand
IVL Swedish Environmental Research Institute · Kristineberg

PhD

About

46
Publications
12,979
Reads
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563
Citations
Citations since 2016
27 Research Items
412 Citations
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Additional affiliations
January 2012 - June 2015
University of Gothenburg
Position
  • Researcher
Description
  • I’m currently working in a project with the objectives to investigate the origin, dispersal and habitat preferences of the invasive Pacific oyster using genetics, oceanographic modelling and age structure analysis as techniques.
April 2010 - December 2011
University of Gothenburg
Position
  • PostDoc Position
Description
  • The objectives of the project were to investigate the origin, dispersal and habitat preferences of the invasive Pacific oyster (Crassostrea gigas), as well as ecological consequences of the establishment of the species.
October 2002 - April 2010
Swedish University of Agricultural Sciences
Position
  • PhD student and researcher
Description
  • PhD education (thesis work) and research about environmental effects of cage culture

Publications

Publications (46)
Article
Full-text available
To limit compromising the integrity of the planet, a shift is needed towards food production with low environmental impacts and low carbon footprint. How to put such transformative change towards sustainable food production whilst ensuring food security into practice remains a challenge and will require transdisciplinary approaches. Combining exper...
Article
Anthropogenic consumption of nitrogen (N) and phosphorus (P) has pushed their respective planetary boundaries beyond a safe operating space causing environmental problems, and simultaneously, the depletion of finite mineral P resources is of growing concern. Previous research has found that marine biomass such as kelp, reed and mussels have a high...
Article
Full-text available
Harvesting beach-cast can help mitigate marine eutrophication by closing land-marine nutrient loops and provide a blue biomass raw material for the bioeconomy. Cost–benefit analysis was applied to harvest activities during 2009–2018 on the island of Gotland in the Baltic Sea, highlighting benefits such as nutrient removal from the marine system and...
Article
Full-text available
A blue-green bioeconomy revolution is underway in Europe, with particular attention being paid to the development of new or underutilized marine biomass resources. The wild harvest and mariculture of low-trophic non-fed species of marine biomass may be contributing to circular economies, the mitigation of environmental problems such as eutrophicati...
Article
Full-text available
Aim Understanding spatial patterns of the distribution of adult native oyster, Ostrea edulis, and the invasive Magallana (Crassostrea) gigas is important for management of these populations. The aim of this study was to use ensemble SDM’s to (a) identify and predict conservation hotspots, (b) assess the current level of protection for O. edulis, an...
Book
Full-text available
Across its indigenous range, there are growing efforts to reintroduce and restore the European native oyster, Ostrea edulis. At many locations, active intervention is necessary to recover native oyster reefs. Actions can include the introduction of oysters in order to increase the breeding population or the introduction of a substrate or medium for...
Book
Full-text available
This European Native Oyster Habitat Restoration Handbook aims to provide foundational and practical guidance on the restoration and conservation of native oysters (Ostrea edulis) and native oyster habitat across the UK and Ireland. The guidance outlined throughout the Handbook is also of relevance to projects across the native oyster’s biogeographi...
Chapter
Full-text available
1. The movement of people, equipment, materials, and oysters between locations carries with it the risk of moving harmful organisms, such as diseases and invasive non-native species. 2. Translocation of material and oysters from one water body to another is never risk-free and should be avoided where possible. 3. Never translocate material from a...
Article
Full-text available
1. Oyster reefs are among the most threatened marine habitats globally. In Europe, oyster reefs have been extirpated from most locations within their historical range. Active restoration of the native oyster (Ostrea edulis) in Europe has grown substantially in recent years. In sharing experiences between oyster restoration projects in Europe at the...
Technical Report
Full-text available
Mussels and oysters are healthy and sustainably produced foods with great economic value. One of the most valuable bivalve molluscs in Sweden is the flat oyster, Ostrea edulis. However, domestic production of oysters fails to meet the demand on the local market at the same time as the Swedish aquaculture industry has difficulties expanding due to l...
Technical Report
Full-text available
Länsstyrelsen har i ett föreläggande (D.nr. 527-46806-2018) uppmanat Bohus Havsbruk att utföra en oberoende vetenskaplig undersökning om interaktionen mellan ejder och nuvarande skyddsnät runt företagets musselodlingar i Stigfjorden, ett område som är av stor betydelse för fågellivet. Utredningen genomfördes av IVL Svenska Miljöinstitutet på uppdra...
Technical Report
Full-text available
One of the most valuable bivalve species in Sweden is the European flat oyster, Ostrea edulis, and the interest in aquaculture of the species is high. Commercial culture of the species is, however, hampered by access to spat as neither sea based collection nor hatchery production have been able to provide reliable sources of seed. In addition, impo...
Technical Report
Full-text available
There is a growing interest in aquaculture, both globally and in Sweden. In Sweden, on a relatively small scale, mainly fish, crayfish and mussels are grown. Traditional farming in ponds, lakes, rivers and coastal areas is affected by a potential negative environmental impact in the form of local eutrophication effects and the spread of antibiotics...
Technical Report
Full-text available
År 2007 rapporterades flera oberoende observationer av det japanska jätteostronet (Magallana gigas f.d. Crassostrea gigas) in till Göteborgs universitet, och inventeringar visade att arten etablerat sig längs med den svenska västkusten från Falkenberg i söder till Strömstad vid gränsen till Norge. Utbredningen har sedan dess expanderat söderut till...
Article
Full-text available
Management of invasive species is addressed in both national and international regulations regarding the protection of marine habitats and biodiversity and in regulations of aquaculture. The geographical range of the invasive Pacific oyster, Crassostrea gigas, is expanding, both through human mediated vectors and by natural dispersal. The species i...
Article
Full-text available
Identifying the routes and rates of introductions is fundamental for the understand- ing of marine invasions. Recurring introductions over the last 50 yr have led to the establishment of feral Pacific oyster Crassostrea gigas populations throughout Europe. In the northern countries, Sweden and Norway, the species first occurred in large numbers in...
Article
Full-text available
The salmon industry is heavily dependent on wrasse for delousing infected fish. The goldsinny wrasse is numerically the most important, and each year, millions are harvested from the wild and transported large distances into fish farms. Population genetic knowledge is required to sustainably exploit this species. Here, 1051 goldsinny wrasses from 1...
Article
Full-text available
The Pacific oyster Crassostrea gigas has recently expanded its range in Scandinavia. The expansion is presumably a result of northwards larval drift. Massive settlements were recorded in many areas along the Swedish west coast and southern Norway in 2013 and 2014. After the spawning season in 2014, the temperature of the surface water peaked at 24−...
Chapter
In commercial aquaculture, knowledge about and means for predicting growth rates, feed intake and energy requirements of the farmed animal in different conditions is essential for the viability of the enterprise. As percid fish species are relatively new in culture, there are no models available to estimate the energy requirement of the cultured fi...
Article
Full-text available
Since 2006, the Pacific oyster Crassostrea gigas has been a permanent resident on the west cost of Sweden. Because C. gigas is nonindigenous in Scandinavia, it may modify ecosystems and affect the resident biota. Individuals of C. gigas often settle in large aggregations, and the physical structure of the resulting reef provides attachment points a...
Article
Full-text available
Blue mussels Mytilus edulis and the invasive Pacific oyster Crassostrea gigas are both ecosystem engineering species which modify the environment, thus having large effects on associated species. With the introduction of the Pacific oyster, a new biogenic structure has been added to subtidal sediment habitats in Scandinavia. By conducting a field e...
Article
Full-text available
A massive invasion of the Pacific oyster, Crassostrea gigas, has occurred in Scandinavia during the last decade. The introduction and dispersal was described through collaboration between scientists from Sweden, Denmark and Norway. This work has been followed up by national activities that clearly visualized the need for a continued collaboration b...
Technical Report
Full-text available
Japanska ostron i svenska vatten Främmande art som är här för att stanna
Data
Full-text available
This is a report published in Swedish by Aquaculture Centre West (Vattenbrukscentrum Väst) at the University of Gothenburg. It presents an analysis, based on economic and biological selection criteria, on which marine fish species could be successful candidate species for marine aquaculture on the Swedish west coast.
Article
Full-text available
AS), eblanda@ruc.dk (EB), torjan.bodvin@imr.no (TB), jdavids@ruc.dk (JKD), lfj@fimus.dk (LFJ), tholmh@ruc.dk (THHH), anders.jelmert@imr.no (AJ), susanne.lindegarth@marecol.gu.se (SL), stein.mortensen@imr.no (SM), frithjof.moy@imr.no (FEM), pnielsen@bio.ku.dk (PN), Pia.norling@niva.no (PN), carlo_nyberg@hotmail.com (CN), htc@aqua.dtu.dk (HTC), bvism...
Article
As an intertidal species, the Pacific oyster (Crassostrea gigas, Thunberg) is very tolerant to varying abiotic conditions. The temperature range for survival has, however, not been fully evaluated. Most notably, information about cold tolerance of the species is missing. As a first step toward acquiring a better understanding of the species’ cold t...
Article
Fish feed constitutes one of the largest costs in aquaculture, therefore inefficient feed management will have a negative impact on fish farm economics. Eurasian perch (Perca fluviatilis L.) is a relatively new candidate for freshwater aquaculture, however little is known about the energy requirements of this species. The aim of this study was to d...
Article
Full-text available
To calculate the theoretical daily energy requirement of fish, information about the daily growth increment and the amount of digestible energy needed (DEN) to obtain one unit of biomass gain is required. The thermal unit growth coefficient (TGC) can be used for estimation of the daily growth increment. TGC is thought to be less affected by body si...
Article
Full-text available
To calculate the theoretical daily energy requirement of fish, information about the daily growth increment and the amount of digestible energy needed (DEN) to obtain one unit of biomass gain is required. The thermal unit growth coefficient (TGC) can be used for estimation of the daily growth increment. TGC is thought to be less affected by body si...
Article
Full-text available
De huvudsakliga miljöeffekterna från fiskodling är; utsläpp av närsalter och eutrofieringsproblem, rymning av fisk som kan konkurrera med och genetiskt ”förorena” vilda bestånd, samt spridning av sjukdomar från odlad fisk till vild. Fokus i detta projekt har legat på närsalterna, specifikt fosfor och dess effekt på primärproduktionen. Syftet med st...
Article
Full-text available
In seasonal environments, accumulated energy reserves are important to avoid starvation mortality during periods of low resource levels. Here we investigated patterns of energy accumulation and the importance of growth history for winter survival in young-of-the-year Eurasian perch (Perca fluviatilis). Under simulated winter conditions in aquaria,...
Article
Eurasian perch (Perca fluviatilis) is receiving increasing attention as a new species in freshwater aquaculture. Understanding perch behaviour and performance in culture is important to optimize the design and management of tanks, and other culture conditions. The objective of this study was to evaluate how different combinations of tank colour and...
Article
Feed intake, growth and feed efficiency of juvenile perch Perca fluviatilis were significantly affected by group size, with fish in groups of 12 having lower feed intake, higher growth and higher feed efficiency than solitary individuals. The same trend was seen for fish in groups of 12 compared to fish in groups of four, and for fish in groups of...
Article
As aquaculture of Eurasian perch (P. fluviatilis) develops, optimizing growth becomes increasingly important. Fish may be stressed by ordinary farming procedures such as handling and cleaning of tanks. This may induce behavioural changes, reduce feed intake, increase energy expenditures and thus reduce growth rates. In order to quantitatively evalu...
Article
Full-text available
In commercial aquaculture, knowledge about and means for predicting growth rates, feed intake and energy requirements of the farmed animal in different conditions is essential for the viability of the enterprise. As Eurasian perch (Perca fluviatilis L.) is relatively new in culture, no growth models or suitable models for evaluation of the daily fe...

Questions

Questions (2)
Question
Hi again. This time I wonder if anyone know of any biotoxins/algae produced toxins that can kill Crassostrea gigas? I know parasites and disease can cause mass mortalities, but how about biotoxins? Regards Åsa
Question
Hi. Does anyone have records, observations or publications of presence of "natural" Crassostrea gigas populations along the European coastline from northern France and southwards, also in the Mediterranean? Any information is appreciated, but I need a GPS position of the site where the oysters are found. We have good occurrence data from Scandinavia, the Wadden sea, the British isles and northern France, but very little south of that.

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Projects

Projects (2)
Project
The aim is to evaluate the possibility to use submerged culturing systems for Pacific oysters (Magallana gigas, f.d. C. gigas) in coastal areas of Sweden, to e.g. control reproduction and improve quality of the oysters. The methods will also be tested using native oysters (O. edulis) and blue mussels (M. edulis).