Staff profile

From Anthrome to Refugium? A short history of small-scale fisheries in the Anthropocene

Boonstra, W.J., Björkvik, E., Joosse, S., Hanh, T.T.H.

2019 - Journal / article

In this article we investigate small-scale fisheries—its characteristics and values—by considering the type of aquatic and marine environments in the Global North and South that they exploit and change. We use the literature on (small-scale) fisheries and our own studies to argue that the aquatic and marine environments where small-scale fishers currently operate are shrinking under the pressures from a globalizing and urbaniz...

A sea of many colours – How relevant is Blue Growth for capture fisheries in the Global North, and vice versa?

Boonstra, W.J., Valman, M., Björkvik, E.

2017 - Journal / article

Blue Growth is a relatively new term that is meant to realize economic growth based on the exploitation of marine resources, while at the same time preventing their degradation, overuse, and pollution. This article discusses the relevance and usefulness of this new concept for the development of capture fisheries, a sector where growth largely seems impossible without ecological devastation. An analytical distinction between i...

The quality of compliance: investigating fishers’ responses towards regulation and authorities

Boonstra, W.J., S. Birnbaum, E. Björkvik

2016 - Journal / article

A substantial amount of scientific effort goes into understanding and measuring compliance in fisheries. Understanding why, how and when fishers follow or violate rules is crucial for designing effective fishery policies that can halt overfishing. Non-compliance was initially explained almost exclusively with reference to economic and self-interested motivations. More recently, however, most explanations involve a combination ...

Stepwise function of natural growth for Scylla serrata in East Africa: A valuable tool for assessing growth of mud crabs in aquaculture

Moksnes, P.-O., D.O. Mirera, E. Björkvik, M.I. Hamad, H.M. Mahudi, D. Nyqvist, N. Jiddawi, M. Troell

2015 - Journal / article

Predicting growth is critical in aquaculture, but models of growth are largely missing for mud crab species. Here, we present the first model of natural growth in juvenile and adult mud crabs Scylla serrata from East Africa using a stepwise growth function based on data on intermoult periods and growth at moult from field mark-recapture, pond and laboratory studies. The results showed a sigmoid growth pattern in carapace wid...