10 research outputs found
An assessment of the Norwegian Deep/Skagerrak shrimp stock using the Stock Synthesis statistical framework
New policies may call for new approaches: the case of Swedish Norway lobster (Nephrops norvegicus) fisheries in the Kattegat and Skagerrak
The northern shrimp (Pandalus borealis) stock in Skagerrak and the Norwegian Deep (ICES Divisions IIIa and IVa East)
Multi-annual fluctuations in reconstructed historical time-series of a european lobster (Homarus gammarus) population disappear at increased exploitation levels
Through the history of ecology, fluctuations of populations have been a dominating topic, and endogenous causes of fluctuations and oscillations have been recognized and studied for more than 80 years. Here we analyzed an historical dataset, covering more than 130 years, of European lobster (Homarus gammarus) catches. The data shows periodic fluctuations, which are first dampened and then disappear over time. The disappearance of the periodicity coincided with a substantial increase in fishing effort and the oscillations have not reappeared in the time series. The shifting baseline syndrome has changed our perception of not only the status of the stock, but also the regulating pressures. We describe the transition of a naturally regulated lobster population into a heavily exploited fisheries controlled stock. This is shown by the incorporation of environmental and endogenous processes in generalized additive models, autocorrelation functions and periodicity analyses of time-series
The short-term impacts of implementing catch quotas and a discard ban on English North Sea otter trawlers
A key objective of the European Union's Common Fisheries Policy reforms is the elimination of discards and a reduction in unwanted catches. Combining a discard ban with catch quotas, where all fish, independent of size, count towards quotas could create economic incentives for more selective fishing, reducing unwanted catches. We use fishing activities data from English North Sea otter trawlers to examine the impact of these measures on this fleet. Initial impacts depend on the scale of increase and distribution of quotas and are unevenly distributed, depending on catch and discard characteristics of vessels. Selective fishing will be rewarded as vessels that currently have low discards could increase catches and profits. Fishing by less selective vessels will be curtailed, reducing profits by 1–14%. This could be partially mitigated through reducing regulated catches but will require changes to fishing patterns as using currently available selective fishing gears may impact on profitability. So, catch quotas and a discard ban create strong incentives for more selective fishing practices, but also for non-compliance with full documentation of catches. A high level of monitoring and enforcement will be required to ensure that fishers improve profitability through more selective fishing practices rather than illegal discarding