Ulva intestinalis är en fotoautotrof grönalg som är utspridd i stora delar av världen och har ett flertal användningsområden, däribland som matråvara samt som biobränsle. Matindustrin står idag för en fjärdedel av världens utsläpp av växthusgaser. För att FN:s globala mål ska uppnås innan år 2030 måste dessa utsläpp minska. Ett sätt att bidra till att målen nås är att ändra vilka livsmedel som produceras, där alger kan vara en del av den framtida mera hållbara maten. Syftet Med detta arbete var att undersöka möjligheterna för en hållbar algodling för matkonsumtion.Målet var att genom en litteraturstudie hitta en parameter som potentiellt kan påverka tillväxten av Ulva intestinalis och planera ett experiment i en odlingsanläggning på norra Öland som undersöker den valda parametern. I litteraturstudien undersöktes det vilken parameter som skulle kunna testas i en framtida odlingsanläggning. Resultatet som erhölls från litteraturstudien var att substrat är viktigt för algens sporsättning och i kombination med projektets begränsande faktorer blev substrat den parameter som bör testas i experimentet. Utifrån att substrat valdes som parameter lades ett förslag på ett experiment fram. Slutligen diskuterades potentiella felkällor samt så gavs det förslag på eventuella fortsatta studier. / Ulva intestinalis is a photoautotroph green algae that is found in large parts of the world, and has a variety of uses, for example as food and as biofuel. The food industry is responsible for one fourth of the world’s green gas emissions, and for the United Nations’ Sustainable Development Goals to be reached before the year 2030, these emissions must be reduced. One way to contribute to the achievement of these goals is to change what kind of food is being produced,and algae could be part of the more sustainable future food. The purpose with the project was to examine the possibilities for a sustainable land-based algal cultivation for food use. The goal was to find a parameter that could potentially influence the growth of Ulva intestinalis, and to plan an experiment in a cultivation plant in northern Öland that examines the selected parameter. The method that was selected to fulfill the goal of the project was a literature study, in which some potential growth parameters were identified, so a conclusion of which parameter should be tested in a future experiment could be made. The result from the study was that substratum is important for the settlement of the spores, and in combination with the limits of the project it was chosen to be the parameter to be tested in the planned experiment. On the basis of substratum as the selected parameter, a proposal for an experiment was presented. Finally, potential sources of error were discussed, and suggestions for future studies were made.

In the future, the cultivation of algae for food may become increasingly important in Sweden. But this area is still new in Europe and most of the harvest today comes from wild stocks. In Sweden, cultivation is only available on the west coast, but research is underway to see if it is possible to start cultivating macroalgae in the Baltic Sea as well. The Baltic Sea has completely different biological conditions than the west coast, and one of the challenges is the low salinity, which limits the species that can live in the Baltic Sea. This is something that the Marine Center in Simrishamn is also researching in the project Tångkusten, of which this study is a part of. The purpose of this study is to use a literature study to compile available knowledge about which algae that has the potential to be cultivated in the future and what the life cycles of these algae look like. An inventory of the macroalgae found locally in Hanöbukten was also carried out. Based on this information, possible cultivation methods and the advantages of each species are discussed, but also the challenges that may arise.  The results showed that the most abundant species were filamentous brown algae, bladder wrack and saw wrack . The species deemed most cultivable are gut weed and sea lettuce. Clawed fork weed, bladder wrack and saw wrack are also considered to have some cultivation potential. Among the biggest challenges are the growth of epiphytic algae and finding a suitable site for cultivation. / Projektet Tångkusten på Marint centrum i Simrishamn