What Can Fisheries Historians Learn from Marine Science? The Concept of Catch per Unit Effort (CPUE)

Poulsen, René Taudal; Holm, Poul

doi:10.1177/084387140701900205

Cited by 12 publications

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“…In marine systems, fisheries are often the main driver of change, affecting not only the size and the distribution of marine populations but also the structure of coastal habitats (Jackson et al, 2001;Reise, 2005), and increasing evidence is available on associated population declines and species extirpations in the sea over hundreds of years (Carlton et al, 1999;Lotze, 2007). One often initial effect of a deteriorating ecosystem state in fisheries is the severely declining yield per unit effort (see Poulsen and Holm, 2008). In the North Sea, such signs of severe decline were already recognized in the 1880s and 1890s (Anon, 1913;Sims and Southwood, 2006) and confirmed thereafter by long-term analyses (Lundbeck, 1962;Thurstan et al, 2010).…”

Section: Introductionmentioning

confidence: 99%

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Estimating historical trawling effort in the German Bight from 1924 to 1938

Fock¹

2014

Fisheries Research

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Section: Introductionmentioning

confidence: 99%

“…A concise description of the fisheries with cpue/lpue values representative for the target species or main catch and of the area for which the assessment is undertaken, is a prerequisite for this approach (Poulsen and Holm, 2008;Walters, 2003). Effort may be expressed in different units (e.g.…”

Section: Introductionmentioning

confidence: 99%

Estimating historical trawling effort in the German Bight from 1924 to 1938

Fock¹

2014

Fisheries Research

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“…All the powder extracted from an increment was thoroughly homogenized before an aliquot of the sample was isotopically characterized. where C represents the catch, E represents the effort, N is the fish density and q is the catchability coefficient (Arreguín-Sánchez, 1996; Poulsen & Holm, 2007). The effort can be defined in different ways, ranging from the number of ships in a given year's fishing fleet, the total area of fishing net, or the ships' dimensions and power.…”

Section: Comparison To Historical Datamentioning

confidence: 99%

Reconstruction of Atlantic herring (Clupea harengus) recruitment in the North Sea for the past 455 years based on the δ¹³C from annual shell increments of the ocean quahog (Arctica islandica)

et al. 2019

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Understanding the recruitment variability of the Atlantic herring North Sea stock remains a key objective of stock assessment and management. Although many efforts have been undertaken linking climatic and stock dynamic factors to herring recruitment, no major attempt has been made to estimate recruitment levels before the 20th century. Here, we present a novel annually resolved, absolutely dated herring recruitment reconstruction, derived from stable carbon isotope geochemistry (δ13C), from ocean quahog shells from the Fladen Ground (northern North Sea). Our age model is based on a growth increment chronology obtained from fourteen shells. Ten of these were micromilled at annual resolution for δ13C analysis. Our results indicate that the anthropogenically driven relative depletion of 13C, the oceanic Suess effect (oSE), became evident in the northern North Sea in the 1850s. We calculated a regression line between the oSE‐detrended δ13C results (δ13CṠ) and diatom abundance in the North Sea, the regression being mediated by the effect of phytoplankton on the δ13C of the ambient dissolved inorganic carbon. We used this regression to build an equation mediated by a nutritional link to reconstruct herring recruitment using δ13CṠ. The reconstruction suggests that there were five extended episodes of low‐recruitment levels before the 20th century. These results are supported by measured recruitment estimates and historical fish catch and export documentation. This work demonstrates that molluscan sclerochronological records can contribute to the investigation of ecological baselines and ecosystem functioning impacted by anthropogenic activity with implications for conservation and stock management.

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“…CPUE was defined as the biomass of fish caught per hook and fishing season (c.f. Poulsen and Holm 2007). It is here assumed that the length of the fishing season was comparable between different years.…”

Section: Metricsmentioning

confidence: 99%

A centurial development of the North Sea fish megafauna as reflected by the historical Swedish longlining fisheries

et al. 2014

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Historically, to compensate for declining catches, fishers have usually shifted from species characterized by high catch rate onto less easily caught species or have moved into new fishing grounds. Such shifts are poorly documented for areas with a long history of exploitation (i.e. North Sea) as they occurred long time before the start of the regular assessments of the marine resources. The Swedish longline fisheries in the Kattegat-Skagerrak and North Sea have a long history that spans over several centuries. These fisheries have historically targeted large demersal predator fish as ling (Molva molva), cod (Gadus morhua), Atlantic halibut (Hippoglossus hippoglossus) and skates (mainly Dipturus spp.). In this study, data from the Swedish longline fisheries from 1859 to 1960 have been collated. The data show that the geographical expansion of the fishery was extensive. At the turn of the 20th century, offshore longlining became concentrated north and west of the Shetlands and Hebrides, and after the WWII, the fishery expanded to Iceland and Rockall. In the offshore fishery, CPUE for the main target species, ling, remained stable, whereas for the other species, with the exception of tusk (Brosme brosme), CPUE showed a dramatic decline over time. In contrast, in the coastal longlining fishery, severe declines were revealed for all major target species except cod. We argue that the constant search for new fishing grounds in the Northeast Atlantic reflects a dwindling resource, where the fishermen kept the catch rates of ling high by travelling to more and more distant fishing grounds.

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What Can Fisheries Historians Learn from Marine Science? The Concept of Catch per Unit Effort (CPUE)

Abstract: Museum. We would also like to express our gratitude to two anonymous reviewers for valuable comments on the manuscript.

Cited by 12 publications

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Estimating historical trawling effort in the German Bight from 1924 to 1938

Estimating historical trawling effort in the German Bight from 1924 to 1938

Reconstruction of Atlantic herring (Clupea harengus) recruitment in the North Sea for the past 455 years based on the δ¹³C from annual shell increments of the ocean quahog (Arctica islandica)

A centurial development of the North Sea fish megafauna as reflected by the historical Swedish longlining fisheries

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What Can Fisheries Historians Learn from Marine Science? The Concept of Catch per Unit Effort (CPUE)

Abstract: Museum. We would also like to express our gratitude to two anonymous reviewers for valuable comments on the manuscript.

Cited by 12 publications

References 0 publications

Estimating historical trawling effort in the German Bight from 1924 to 1938

Estimating historical trawling effort in the German Bight from 1924 to 1938

Reconstruction of Atlantic herring (Clupea harengus) recruitment in the North Sea for the past 455 years based on the δ13C from annual shell increments of the ocean quahog (Arctica islandica)

A centurial development of the North Sea fish megafauna as reflected by the historical Swedish longlining fisheries

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About

Reconstruction of Atlantic herring (Clupea harengus) recruitment in the North Sea for the past 455 years based on the δ¹³C from annual shell increments of the ocean quahog (Arctica islandica)