Alf Ring Kleiven

Alf Ring Kleiven
Institute of Marine Research in Norway | IMR · Research Group of Fisheries dynamics

PhD

About

47
Publications
12,064
Reads
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843
Citations
Introduction
Current research: 1) A FRAMEWORK FOR SCIENCE-BASED MANAGEMENT OF MARINE RECREATIONAL FISHERIES IN NORWAY, Financed by NFR 2) Techonlogical creep in the lobster fishery. 3) Ghost fishing in marine national parks 4) Monitoring of the lobster (Homarus gammarus) fishery (Skagerrak and Norwegian Sea), estimating effort and catches based on the newly implemented licence system 5) MPA implementation processes and their effects on fish populations and fisheries
Additional affiliations
April 2007 - present
Institute of Marine Research in Norway
Description
  • Main research interests: Recreational fisheries & MPAs
Education
April 2007 - May 2010
UiT The Arctic University of Norway
Field of study
  • Faculty of biosciences, fisheries and economics
February 2002 - September 2003
James Cook University
Field of study
August 1995 - June 2001
University of Bergen
Field of study
  • Marine Biology

Publications

Publications (47)
Article
Full-text available
Marine protected areas (MPAs) are considered viable fisheries management tools due to their potential benefits of adult spillover and recruitment subsidy to nearby fisheries. However, before–after control–impact studies that explore the biological and fishery effects of MPAs to surrounding fisheries are scarce. We present results from a fine-scale...
Article
Full-text available
Recreational fishing, by both local residents and tourists, is a popular activity globally. The behaviour and motivation of recreational fishers is different from those of commercial fishers. Unlike the latter, the former are not dependent on making profits to continue fishing. Rather, the value of recreational fishing to those who engage in it is...
Article
Full-text available
This article reviews a suite of studies conducted in a network of coastal Marine Protected Areas (MPAs) in Skagerrak, Southeast Norway. In 2006, Norway’s first lobster reserves were implemented, with the aim of protecting European lobster (Homarus gammarus) through a ban on fixed gear. A before–after control-impact paired series (BACIPS) monitoring...
Article
Full-text available
The positive effects of reduced fishing pressure in marine protected areas (MPAs) are now well documented globally. Yet, evidence of MPA benefits from long-term replicated before-after control-impact (BACI) studies and their usefulness in protecting target species are still rare, especially in northern temperate areas. Scientific rigor in the monit...
Article
Full-text available
Fishery-dependent data are frequently used to inform management decisions. However, inferences about stock development based on commercial data such as Catch-Per-Unit-Effort (CPUE) can be severely biased due to a phenomenon known as technological creep, where fishing technology improves over time. Here we show how trap improvement over nine decades...
Technical Report
Full-text available
Rapporten om strandkrabbe og strandkrabbefiskeri er en grundig gjennomgang av den biologiske kunnskapen som finnes. I tillegg er det tatt inn økologisk vurdering av strandkrabbens plass i økosystemet, og trusler den har fra invasjonsarter som penselkrabber. Denne rapporten presenterer oppdatert kunnskap om strandkrabber, fra livssyklus, biologi og...
Article
Full-text available
A wide range of applications in marine ecology extensively uses underwater cameras. Still, to efficiently process the vast amount of data generated, we need to develop tools that can automatically detect and recognize species captured on film. Classifying fish species from videos and images in natural environments can be challenging because of nois...
Article
Full-text available
Recreational and semi-subsistence fisheries are challenging to monitor but can act as precursors of developments in commercial fisheries, contributing information in data-limited situations. We compared trends in commercial landings of Norway lobster (Nephrops norvegicus) with data collected through a citizen science project by recreational fishers...
Article
Full-text available
Significance Ecological disruption due to human impacts is evident worldwide, and a key to mitigation lies in characterizing the underlying mechanisms of species and ecosystem stability. Here we show that three extensive “supergenes” are maintained in Atlantic cod by stabilizing selection, tying these genes to the persistence of a keystone species...
Technical Report
Full-text available
Prosjektet ‘Aktiv forvaltning av marine ressurser- Frøya og Hitra’ ble formelt startet opp høsten 2017. Den overordnete målsetningen med prosjektet er å etablere en solid kunnskapsplattform for å sikre de marine verdiene og verdiskapningsmulighetene i de to kommunene. Et viktig element i dette arbeidet er å styrke grunnlagsdataene for kommunene for...
Technical Report
Full-text available
Mapping ghost fishing in Raet marine national park
Preprint
Full-text available
A wide range of applications in marine ecology extensively uses underwater cameras. Still, to efficiently process the vast amount of data generated, we need to develop tools that can automatically detect and recognize species captured on film. Classifying fish species from videos and images in natural environments can be challenging because of nois...
Technical Report
Full-text available
Norwegian report on methods to estimate the Norwegian fishery for European lobster (Homarus gammarus) based on a license system
Article
Full-text available
Norway has the highest participation rate in marine recreational fisheries (MRF) in Europe, and is popular among marine tourist anglers. Fishing licences are not required for marine recreational anglers, and the complex and long coastline makes on-site surveys a challenge. A novel approach for spatial sampling was developed and tested in on-site su...
Chapter
Our understanding and ability to effectively monitor and manage coastal ecosystems are severely limited by observation methods. Automatic recognition of species in natural environment is a promising tool which would revolutionize video and image analysis for a wide range of applications in marine ecology. However, classifying fish from images captu...
Preprint
Full-text available
Our understanding and ability to effectively monitor and manage coastal ecosystems are severely limited by observation methods. Automatic recognition of species in natural environment is a promising tool which would revolutionize video and image analysis for a wide range of applications in marine ecology. However, classifying fish from images captu...
Article
Full-text available
Marine protected areas (MPAs) are considered viable fisheries management tools due to their potential benefits of adult spillover and recruitment subsidy to nearby fisheries. However, before-after control-impact studies that explore the biological and fishery effects of MPAs to surrounding fisheries are scarce. We present results from a fine-scale...
Article
Atlantic cod (Gadus morhua) in Skagerrak are structured into distinct ecotypes or stock components that have been severely depleted over the past decades. To improve our understanding of how local commercial and recreational fisheries influence cod stocks, we investigated whether these user groups target different stock components of cod. Cod were...
Article
Full-text available
Marine recreational fishing (MRF) is a high-participation activity with large economic value and social benefits globally, and it impacts on some fish stocks. Although reporting MRF catches is a European Union legislative requirement, estimates are only available for some countries. Here, data on numbers of fishers, participation rates, days fished...
Technical Report
Full-text available
Hummerfisket har en lang historie i Norge og har vært en viktig inntektskilde for mange kystsamfunn. Siden 1970-tallet har derimot bestanden vært på et historisk lavt nivå. Til tross for høye priser på hummer kan hummerfisket nærmest karakteriseres som økonomisk utryddet; det er svært begrenset kommersiell lønnsomhet i dette fiskeriet mer. Fritidsf...
Technical Report
Full-text available
Evaluation of Marine Protected Areas (MPAs) implemented in Tvedestrand in 2012
Article
Knowledge on mortality causes is key for an effective management of animal populations and can help to restore depleted fish stocks. Here we investigated the mortality dynamics of coastal Atlantic cod in Skagerrak, south Norway, by analyzing local mark-recapture and recovery data collected from 2005 to 2013 (N = 9360 fish, mean length = 41 cm, rang...
Article
Full-text available
Marine recreational fishing is a popular outdoor activity. However, knowledge about the magnitude of recreational catches relative to commercial catches in coastal fisheries is generally sparse. Coastal Atlantic cod (Gadus morhua) is a target species for recreational fishers in the North Atlantic. In Norway, recreational fishers are allowed to use...
Data
File specification of the multi-event modelling approach in program E-SURGE. Description of the model pattern and matrices used in the analysis of recovery data. (DOC)
Data
Each row in the dataset contains information regarding a single individual. (TXT)
Poster
Full-text available
Individual deaths in animal populations can be related to multiple causes, either natural or anthropogenic, but the contribution of each of these factors to total mortality has seldom been evaluated, despite cause-specific mortality proportions may help us to understand the demographic impacts of different mortality factors and allow us to derive a...
Article
Full-text available
Studying the sub-lethal effects of catch-and-release (C&R) is challenging, as there are several potential sources of bias. For example, if behavioural alterations immediately after the release event are to be studied, separation of tagging effects from actual C&R effects is required, which is a challenge in the wild, particularly in marine environm...
Article
1. With the drive for greater numbers and areas of MPAs to be put in place to meet national and international targets, challenges have emerged in both the establishment and development of sustainable governance of the networks of sites that are emerging. 2. Using 12 presentations given in a workshop on 'Improving participation for better governance...
Article
Full-text available
The management of recreational fisheries benefits from good collaboration between scientists, managers and recreational fishers. However, the level of collaboration largely depends on the levels of effective communication among the different stakeholders. This paper presents the views of scientists, managers and fishers concerning the quality of co...
Article
Full-text available
Marine protected areas (MPAs) are increasingly implemented as tools to conserve and manage fisheries and target species. Because there are opportunity costs to conservation, there is a need for science-based assessment of MPAs. Here, we present one of the northernmost documentations of MPA effects to date, demonstrated by a replicated before-after...
Data
a b s t r a c t A workshop of over 100 participants, balanced between fisheries management and biodiversity conservation backgrounds, reviewed and synthesised experiences regarding policy and institutional frameworks for use of MPAs in the contexts of fisheries management and conservation of biological diversity. The workshop concluded that althoug...
Article
Full-text available
Accurate information on total catch and effort is essential for successful fisheries management. Officially reported landings, however, may be underestimates of total catch in many fisheries. We investigated the fishery for the nationally red-listed European lobster (Homarus gammarus) in south-eastern Norway. Probability-based strip transect survey...
Article
Full-text available
A workshop of over 100 participants, balanced between fisheries management and biodiversity conservation backgrounds, reviewed and synthesised experiences regarding policy and institutional frameworks for use of MPAs in the contexts of fisheries management and conservation of biological diversity. The workshop concluded that although fisheries mana...
Article
Full-text available
page/terms-and-conditions This article may be used for research, teaching, and private study purposes. Any substantial or systematic reproduction, redistribution, reselling, loan, sub-licensing, systematic supply, or distribution in any form to anyone is expressly forbidden. The publisher does not give any warranty express or implied or make any re...
Conference Paper
Recreational fishing for coastal marine species can be significant, but is often challenging to estimate. Here we present a case study where a probability-based strip transect survey is used to estimate effort in the Norwegian fishery for European lobster (Homarus gammarus). This fishery is conducted by both recreational and commercial fishers, but...
Conference Paper
Recreational angling has become an increasingly important part of the Norwegian tourism industry and may contribute significantly to the fishing mortality of the Norwegian coastal cod (Gadus morhua) stock, which might presently be overfished. A national probability-based survey was conducted during 2009 to estimate the harvest of cod and eight othe...
Article
Full-text available
Place-based management is any management action having implications for a specified area. Place-based management is seen as a key component to practical implementation of ecosystem approach to management, with marine spatial planning (MSP) being the currently most promoted approach. In the present paper we address the challenges of place-based mana...
Chapter
Full-text available
The Norwegian fishery for European lobster (Homarus gammarus) has gradually decreased over the last 50 years. In 2006, four experimental lobster reserves (0.5-1 km2 in area) were established along the Skagerrak coast in Southern Norway, with only hook- and line-type gear allowed inside the reserves. The objective was to provide knowledge of the eff...

Questions

Question (1)
Question
I am looking for any studies that has analysed what happens if a marine reserve is again opened to fishing. Any tips highly welcomed?

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Projects

Projects (7)
Archived project
The aim of BIOKEY is to identify possible predators with controlling impact on lower trophic levels within the kelp forest ecosystem. The project take advantage of large scale changes in the kelp forest distribution observed along the Norwegian coast. The project is funded by Ministry of Trade, Industry and Fisheries, and is a cooperation between Institute of Marine Research IMR and University of Oslo.
Archived project
Does a small and relatively young MPA provide benefits to nearby fishing grounds?