in the ATSW area. The present study aims to develop predictive models of catches per unit of fishing effort (CPUE) for two of the most abundant commercial species in the area (Southwest Atlantic Fisheries- ATSW). These models are based on intelligence artificial techniques, in particular Multilayer Perceptron (MLP) neural networks.
Development and validation of chlorophyll a (Chla) algorithms for MERIS full-resolution data in Rias Baixas coastal waters (NW Spain). In this study, an algorithm based on neural network technology (NN) was developed for the retrieval of chla concentration using Medium Resolution Imaging Spectrometer (MERIS) remote sensing reflectance paired with in-situ Chla data.
Shifting baselines and simple environmental indicators in Scottish fish stocks and fisheries: whiting.
Pierce G.J1, , Pita C1&2, Beare D3, Bailey N3
1School of Biological Sciences, University of Aberdeen, Tillydrone Avenue, Aberdeen, AB24 2TZ, UK
2Business School, Department of Economics, University of Aberdeen, Edward Wright Building, Dunbar Street, Aberdeen AB24 3QY, Scotland, UK.
3Marine Scotland, Marine Laboratory, PO Box 101, 375 Victoria Road, Aberdeen, AB11 9DB, UK.
Shifting baseline is a term used to describe the way significant changes to system are measured against past baselines, which themselves may represent significant changes from the original state of the system. It was first used by the marine biologist Daniel Pauly to describe the way that radically depleted fisheries were evaluated by experts who used the state of the fishery at the start of their careers as the baseline, rather than the fishery in its untouched state. The term has become widely used to describe the shift over time in expectations about the characteristics of a healthy ecosystem.
Whiting Merlangius merlangus (Linnaeus, 1758) is the 3rd most important commercial demersal fish species in the UK after cod and haddock. Since the late 1970s commercial landings declined gradually to a historical low. In this paper, we examine evidence for existence of stable “baseline” conditions in the whiting stock and fishery in the North Sea during the 20th century, in terms of spatial distribution, abundance (SSB), size structure of populations, and official records of landed catches. We try to determine whether simple size-based indicators are useful proxies of stock size estimates, and to examine the