On Tuesday 16 December, Guðbjörg Stella Árnadóttir will hold her master's defense in the field of resources. The defense takes place at 13:00 and will be in room K201 in Sólborg.
Stella's project is entitled "The effects of cold cathode lights on growth of juvenile Atlantic cod (Gadus morhua L.): use of IGF-I as an indicator of growth".
The project was part of a larger project, "Development of industrialized cod farming: Growth and puberty management with advanced lighting equipmentWhich was funded by the AVS fund and was a collaborative project of Matís ohf., The Marine Research Institute, Hraðfrystihús Gunnvarar hf., The University of Gothenburg, the University of Hólar, the University of Akureyri, Matís-Prokaría and the Westfjords Nature Center.
Guðbjörg Stella's master project was funded by Matís ohf., The AVS Fund, Landsbankinn and the Margrét Björgólfsdóttir Memorial Fund.
Ljóslota is one of the environmental factors that has the greatest impact on the growth and sexual maturity of cod, as in other fish species. Recent research suggests that the growth rate of cod can be increased by using light control to extend the day over autumn and winter. In this study, cod juveniles were reared in cans using new cold-cathod lights (CCLs) from a weight of about 10 grams. With the lighting, the juveniles were created special environmental conditions very early in the life cycle that can potentially increase sensitivity to certain wavelengths of light when the juveniles are later in the life cycle transferred to light-controlled sea cages. The effect of the light on the growth of the juveniles and the concentration of IGF-I (insulin-like growth factor-I) in the blood were studied.
The main results of the study indicate that treatment with CCL lights does not affect the growth or survival of cod fry in the first year of fire. The results also show that it is possible to measure the level of IGF-I in the blood, but there was no relationship between the growth rate and the concentration of IGF-I in the blood of cod during this developmental stage. The results also indicate that treatment with CCL lights in the early stages of farming has a positive effect with regard to skeletal defects that have been a problem in cod juvenile farming.
Supervisors and the supervisors of the project were Rannveig Björnsdóttir, assistant professor at the University of Akureyri / head of department at Matís ohf., Dr. Þorleifur Ágústsson project manager Matís ohf., Professor Björn Þrándur Björnsson at the Faculty of Fish Physiology at the University of Gothenburg and Dr. Helgi Thorarensen, head of the aquaculture department at Hólar University.
Opponent is Dr. Logi Jónsson, Associate Professor at the University of Iceland.