Projekt

Improving sea farming sustainability - Effects of fish feed composition on fecal removal potential

Udbyder

Vejleder

Sted

Nordjylland

Net cage farming of salmonids is a huge and growing industry especially in countries like Norway where environmental conditions (deep oligotrophic fjords) favor this type of production. In comparison, net cage production in eutrophicated regions like Denmark is more challenged depending on the exact location and local current conditions, and new measures are requested.

As it is now, solid and dissolved waste nutrients from net cages (consisting primarily of organic matter, phosphorus, and nitrogen) dilute and disperse in the sea with no further treatment. All net cage waste traces directly (via feed spill) and indirectly (via fish excretion and faces) to fish feed, and fish feed modifications therefore have a huge impact on especially waste nutrient quantities and to some extent also on solid fecal physical structure.

Aiming at improving net cage sustainability by eventually collecting fish feces from cages, the objective of the current project is to resolve if - and to what extent - fish feed manipulations may improve fish feces coherency, density, and sinking velocity making them easier to collect. To resolve this, a number of controlled experiments are needed. Procedures for measuring fecal pellet coherency, density, sinking velocity (e.g., video recording), and nutrient leakage will be developed in the lab. The methods will be applied to controlled feeding trials with large (> 700 g) all-female rainbow trout maintained in the lab and fed different modified diets.

I samarbejde med

AquaPri, BioMar, Hvalpsund Net, the Danish Aquaculture Association

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Kontakt

Virksomhed/organisation

DTU Aqua

Navn

Anne Johanne Tang Dalsgaard

Stilling

Seniorforsker

Mail

jtd@aqua.dtu.dk

Vejleder-info

Kandidatuddannelsen i Akvatisk Videnskab og Teknologi

Vejleder

Anne Johanne Tang Dalsgaard

ECTS-point

10 - 35

Type

Bachelorprojekt, Kandidatspeciale

OM DTU

DTU er et teknisk eliteuniversitet med international rækkevidde og standard. Vores mission er at udvikle og nyttiggøre naturvidenskab og teknisk videnskab til gavn for samfundet. 10.000 studerende uddanner sig her til fremtiden, og 5.700 medarbejdere har hver dag fokus på uddannelse, forskning, myndighedsrådgivning og innovation, som bidrager til øget vækst og velfærd.

Find os her

Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby


45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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