Norwegian Institute of Water Resources (NIVA) - Porsanger

Restoration Project

Norwegian Institute of Water Resources (NIVA) - Porsanger

Restoration Objective:

Testing quicklime application and efficacy and then removing sea urchins at a large scale to restore kelp forest.

Site Selection Criteria:

Urchin barrens with low biodiversity were targeted in areas that were once kelp.

Key Reasons For Decline:


Scientific Paper

Financial and institutional support are important for large-scale kelp forest restoration.

A. M. Eger, A. Vergés, C. G. Choi, H. C. Christie, M. A. Coleman, C. W. Fagerli
Frontiers in Marine Science, 7.

Site Observations:

Observation Date

1st Jan 2011 – 1st Jan 2017

Action Summary:

n 2011, a pilot project involving local authorities, research institutions, and industry tested whether the use of quicklime (CaO), which dissolves urchin tests on contact, had any unintended environmental impacts in Porsanger Fjord. After 1 year, cover of macroalgae and kelp increased, and the method was then scaled up in Porsanger in year 2 (∼30 ha) and replicated in nearby Hammerfest over an area of ∼80 ha in 2017.

Lessons Learned:

Quicklime can be effective approach for restoring kelp forests with minimal collateral damage when applied correctly.

Project Outcomes:

These efforts resulted in the return of the kelps Saccharina latissima and Alaria esculenta and increases in faunal biodiversity.

Area of Restoration (Ha)


Indicator Data:

Transplant Info:
Life Stage:NA
Cost Year:2021
Cost Currency:NOK
Total Cost:30,000