WP2: Sea Cultivation

Laboratory and field experiments will be designed to develop new knowledge on growth, biochemical composition and biofouling under variable conditions of nutrient availability, light, temperature and salinity along the Norwegian coast.

WP2 Illustration

Laboratory and field experiments will be designed to develop new knowledge on growth, biochemical composition and biofouling under variable conditions of nutrient availability, light, temperature and salinity along the Norwegian coast. A monitoring program for seaweed growth and fouling covering the Norwegian coast from Agder to Tromsø will be carried out. Moreover, seedlings of different quality produced in WP1 will be cultivated in order to test and follow the impact of the defined seedling quality parameters on biomass yield and quality during out-growth at sea.

Status

Status autumnt 2019

A lab experiment has been conducted with nitrogen-saturated and nitrogen-limited juvenile S. latissima (8-12 cm in length) to study N-uptake of nitrate and ammonia (WP2). Results are being analysed and soon ready to be submitted for publication. One MSc-thesis by V.R. Dahlen has been published: "Characterization of the initial ammonium uptake in S. latissima: Possible implications for an IMTA system with intensive salmon farming". A Monitoring programme has been performed with S. latissima. Seeded ropes were deployed at 9 sites in Feb 2017 followed by registrations from Apr to Sep the same year. Chemical analysis of amino acids, heavy metals, CN, internal nitrate, ash and dry matter is complete together with growth and biofouling data, and carbohydrate contentis being analysed. The manuscript «Latitudinal, seasonal and depth-dependent variation in growth, chemical composition and biofouling of cultivated sugar kelp (Saccharina latissima) along the Norwegian coast» is submitted and currently under revision. Two MSc-thesis have been published: "Morfologiske relasjonar til dyrka S. latissima ved tre stasjonar langs Norskekysten" by S. Foldal, and "The effects of variable environmental conditions on growth, nutritional state and protein content in cultivated S. latissima in Norway" by G. E. Brodahl. The results will significantly improve the sugar kelp growth model in SINMOD (WP4). An article has been published in Journal of Aquaculture on variation of biofouling and growth of S. latissima (Matsson et al 2019). A field trial has been conducted on the date of deployment (Feb, Apr, May) of S. latissima related to growth, internal nitrate-N, C/N and fouling in Tromsø. Preliminary results show a difference between the deployment dates in amount of biofouling and growth.

Publications:

  • Brodahl GE (2018). The effects of variable environmental conditions on growth, nutritional state and protein content in cultivated S. latissima in Norway. MSc-thesis, NTNU
  • Bøe RR (2019). Investigation of important steps in Palmaria palmata cultivation. MSc-thesis, NTNU
  • Dahlen V (2018). Characterization of the initial ammonium uptake in Saccharina latissima: Possible implications for an IMTA system with intensive salmon farming. MSc-thesis, NTNU
  • Foldal S (2018). Morfologiske relasjonar til dyrka S. latissima ved tre stasjonar langs Norskekysten. MSc-thesis, NTNU
  • Forbord S, Matsson S, Brodahl G, Bluhm B, Broch OJ, Handå A, Metaxas A, Skjermo J, Steinhovden KB, Olsen Y. Latitudinal and seasonal variation of growth, chemical content and biofouling of cultivated sugarkelp (Saccharina latissima) along the Norwegian coast. Under review
  •  Matsson S, Christie H, Fieler R (2019). Variation in biomass and biofouling of kelp, Saccharina latissima, cultivated in the Arctic, Norway. Aquaculture 506, p 445-452 .https://www.sciencedirect.com/science/article/pii/S0044848618300103
  • Skjermo J (2019). Høsting av havents planter – tang og tare. In: Nye Muligheter for verdiskaping i Norge, Almås K (ed).  

    https://www.nho.no/contentassets/6ffd5dbbe6e54616b9565b737c7e94ca/sintef_verdiskaping2019.pdf

 

Status autumn 2018

N-uptake study (nitrate and ammonia) in Saccharina

A lab experiment was conducted last year with juvenile S. latissima (8-12 cm in length). The experiment was run with both N-saturated and N-starved plants. Different concentrations of NO3 and NH4 were used, and samples were taken at different time intervals. Results are under treatment and the first paper will be submitted at the end of this year. Master student Vegard R. Dahlen delivered his MSc thesis in June 2018 with the title " Characterization of the initial ammonium uptake in Saccharina latissima: Possible implications for an IMTA system with intensive salmon farming".

Regional monitoring programme with Saccharina latissima (WP1, WP2, WP3, WP4)

Seeded ropes were prepared and sent from SINTEF Sealab to all 10 participants for deployment at sea in early February 2017. Registrations were done from April to September 2017, and biomass was collected from two depths. Chemical analysis for amino acids, heavy metals, CN, internal nitrate, ash and dry matter is complete, and carbohydrate content and biofouling data is currently analysed. Results are under treatment (see preliminary results on poster presented at the annual RCN program conference HAVBRUK/AQUACULTURE below, and a workshop for discussion of these results is planned in October. Two master students delivered their MSc thesis in June 2018; Solveig Foldal ("Morfologiske relasjonar til dyrka Saccharina latissima ved tre stasjonar langs Norskekysten"), and Guri E. Brodahl ("The effects of variable environmental conditions on growth, nutritional state and protein content in cultivated Saccharina latissima in Norway").

Test on deployment time:

A field trial has been conducted on the date of deployment related to growth, internal nitrate-N, C / N and fouling in Tromsø. Sugar kelp were deployed in February, April and May. Length, width, growth, light, temperature, ambient nitrate were measured and samples for internal nitrate-N and C / N were collected. The majority of the May deployment seedlings died due to low seedling quality and deployment coinciding with the spring bloom. The study is in its final phase and only nitrate analyzes are left. These will hopefully be completed before Christmas, depending on the availability of the analytical equipment. Preliminary results show a difference between the deployment dates in amount of biofouling and growth.


 

Status autmn 2017 (EN)

Regional monitoring programme with Saccharina (WP1, WP2, WP3, WP4): Seeded ropes were prepared and sent from SINTEF Sealab to all participants for deployment at sea in early February. A few challenges occurred due to missing licences for some sites the first weeks and some struggled to get equipment and seedlings in place due to bad weather. We have still managed to get quite some good data sets from several locations. In addition to the industry partners our PhD and MSc students have done a great job with getting registrations done at the different locations. The monitoring programme is completed and we are currently doing analysis.

N-uptake study (nitrate and ammonia) in Saccharina (WP2): A lab experiment was conducted in April with juvenile S. latissima (8-12 cm in length). The experiment was run with both N-saturated and N-starved plants. Six different concentrations of NO3 and NH4 were used (two separate experiments) and samples were taken at seven different time intervals. Analysis are being run these days, and results seems promising.

Workshop

A workshop on cultivation of the red algae Palmaria palmata (WP1 and WP2) with contributions from DTU Food, DTU Aqua, SAMS, NTNU, and UiO was arranged at SINTEF Sealab in Trondheim in October 2017.

Contacts

Silje Forbord

Research Scientist
Name
Silje Forbord
Title
Research Scientist
Phone
971 22 001
Department
Environment and New Resources
Office
Trondheim
Company
SINTEF Ocean AS

Yngvar Olsen

Professor
Name
Yngvar Olsen
Title
Professor
Organization
NTNU