Daniel Stepputtis

Migration Institute of Australia

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Bent Herrmann

UiT The Arctic University of Norway

Ludvig Ahm Krag

Technical University of Denmark

Juan Santos-Echeandía

Instituto Español de Oceanografía

Juan Santos

Johann Heinrich von Thünen-Institut

Bernd Mieske

Johann Heinrich von Thünen-Institut

Harald Wienbeck

Johann Heinrich von Thünen-Institut

Axel Temming

Universität Hamburg

Waldemar Moderhak

National Marine Fisheries Research Institute

Cornelius Hammer

Université du Québec à Rimouski

Isabella Kratzer

University of Pittsburgh Medical Center

Cooperative Institutions

Migration Institute of Australia

519

STMicroelectronics (France)

286

Johann Heinrich von Thünen-Institut

Technical University of Denmark

GEOMAR Helmholtz Centre for Ocean Research Kiel

Kiel University

Universität Hamburg

Shanghai Ocean University

NOAA National Marine Fisheries Service

Ministry of Agriculture and Rural Affairs

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Effect of netting direction and number of meshes around on size selection in the codend for Baltic cod (Gadus morhua)

Fisheries Research (2011)

Harald Wienbeck Bent Herrmann Waldemar Moderhak Daniel Stepputtis

Netting

10.1016/j.fishres.2011.01.019

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Citations (78)

Estimating abundances of 0-group western Baltic cod by using pound net fisheries

Robert Klaus Bauer Daniel Stepputtis Marie Storr‐Paulsen Ronny Weigelt Cornelius Hammer

Nearshore 0-group western Baltic cod are frequently caught as bycatch in the commercial pound net fishery. Pound net fishermen from the Danish Isle of Funen and Lolland and the German Isle of Fehmarn have recorded their catches of small cod between September and December 2008. Abundance patterns were analysed, particularly concerning the influence of abiotic factors (hydrography, meteorology) and the differences between sampling sites. Catch per unit effort (CPUE) differed by site and location, whereas CPUE were highest at Lolland. Correlation between catch and wind/currents were generally weak. However, wind directions and current speeds seem to affect the catch rates. Finally an algorithm was developed to calculate a recruitment index for western Baltic cod recruitment success based on previous analyses.

Bycatch

Baltic sea

10.3220/infn57_1-11_2010

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Citations (2)

The efficiency of sieve‐panels for bycatch separation in Nephrops trawls

Fisheries Management and Ecology (2018)

Juan Santos-Echeandía Bent Herrmann Bernd Mieske Ludvig Ahm Krag Stefanie Haase

Abstract This study investigated the efficiency of a sieve‐panel concept, intended to separate bycatch species from Nephrops (Norway lobster) in a trawl gear via mechanical and behavioural means. Four different designs of varying panel mesh size or inclination were tested in experimental fishing. For each design, the length‐dependent sieving efficiency, defined as the fraction of Nephrops or fish passing through the panel to the lower codend, was estimated. The sieving efficiency for Nephrops increased from ~17% to ~71% as mesh size increased, and decreased with increasing carapace length, but did so less as panel inclination and mesh size increased. The sieving efficiency for roundfish was low, as intended, while the efficiency for flatfish decreased with fish size. Although results are promising, the sieving efficiency for the largest, most valuable Nephrops remained too low. Therefore, further improvements are necessary before the concept is acceptable to the commercial fishing fleet.

Nephrops norvegicus

Bycatch

Sieve (category theory)

10.1111/fme.12323

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Citations (11)

Scientific, Technical and Economic Committee for Fisheries (STECF) - Review of technical measures (part 1) (STECF-20-02)

Sarah Kraak Daniel Stepputtis Ralf Döring Christoph Stransky François Bastardie

Commission Decision of 25 February 2016 setting up a Scientific, Technical and Economic Committee for Fisheries, C(2016) 1084, OJ C 74, 26.2.2016, p. 4–10. The Commission may consult the group on any matter relating to marine and fisheries biology, fishing gear technology, fisheries economics, fisheries governance, ecosystem effects of fisheries, aquaculture or similar disciplines. This reporte valuates the performance of technical measures to conserve fishery resources and protect marine ecosystems in accordance with Article 31 of Regulation (EU) 1241/201.

Fisheries law

Marine Fisheries

Fisheries science

Fishing industry

European commission

10.2760/734593

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Citations (2)

Broadening the horizon of size selectivity in trawl gears

Fisheries Research (2015)

Daniel Stepputtis Juan Santos-Echeandía Bent Herrmann Bernd Mieske

The discussion of alternative harvest patterns in commercial fisheries has been raised by stock assessment and fishery modelers, especially in the wider context of balanced harvesting. But often, these theoretical approaches propose alternative exploitation patterns that are difficult to achieve within the current limitations in the selectivity characteristics of fishing gears, such as trawl gears. The aim of the present study is to broaden the horizon for size selectivity in trawl gears by demonstrating the feasibility of alternative selectivity patterns for trawls. As a case study, we combined two well-known selection devices to obtain a bell-shaped selectivity curve in trawls with low catch ability of both small and large individuals from the target species. We have successfully tested this gear in the Baltic Sea cod fishery. The results revealed that completely different exploitation patterns for trawl gears can be achieved by means of gear technology.

Stock (firearms)

10.1016/j.fishres.2015.08.030

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Citations (28)

Development and testing of HESPAN, a sievenet-based BRD for nephrops trawl fisheries : Bericht über die 709. Reise des FFS Solea vom 09.09. bis 25.09.2015

Juan Santos-Echeandía Bernd Mieske Daniel Stepputtis Ludvig Ahm Krag Bent Herrmann

Nephrops norvegicus

Source

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Citations (0)

Using an innovative net-pen-based observation method to assess and compare fish pot-entrance catch efficiency for Atlantic cod (Gadus morhua)

Fisheries Research (2021)

Jérôme Chladek Daniel Stepputtis Andreas Hermann Isabella Kratzer Peter Ljungberg

Funnel

Enclosure

10.1016/j.fishres.2020.105851

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Citations (7)

Egg mortality: predation and hydrography in the central Baltic

ICES Journal of Marine Science (2011)

R. Voss Hans‐Harald Hinrichsen Daniel Stepputtis Matthias Bernreuther Bastian Huwer

Abstract Voss, R., Hinrichsen, H-H., Stepputtis, D., Bernreuther, M., Huwer, B., Neumann, V., and Schmidt, J. O. 2011. Egg mortality: predation and hydrography in the central Baltic. – ICES Journal of Marine Science, 68: 1379–1390. Cod and sprat are the dominant fish species in the Baltic pelagic ecosystem, both of great economic importance and ecologically strongly interlinked. Management of both species is challenged by highly variable recruitment success. Recent studies have identified predation and hydrographic conditions during the egg phase to be of critical importance. Two years of extensive field investigations in the Bornholm Basin, central Baltic Sea, were undertaken. In 2002, a typical stagnation situation characterized by low salinity and poor oxygen conditions was investigated, and in early 2003, a major inflow of North Sea water completely changed the hydrographic conditions by increasing salinity and oxygen content, thereby altering ecological conditions. The goal was to quantify egg mortality caused by predation and hydrography, and to compare these estimates with independent estimates based on cohort analysis. Results indicated high intra-annual variability in egg mortality. Cod and sprat egg mortality responded differently to the major Baltic inflow: mortality related to hydrographic conditions increased for sprat and decreased for cod. On the other hand, predation mortality during peak spawning decreased for sprat and increased for cod.

Sprat

Gelatinous zooplankton

10.1093/icesjms/fsr061

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Citations (23)

Um artigo na língua original, que passa a ser o inglês

The Journal Of Test Deposits (2013)

Daniel Stepputtis

10.5555/translation

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Citations (0)

Catch Patterns of the German Baltic Sea Trawl Fleet Targeting Demersal Species Between 2006 and 2009

Acta Ichthyologica Et Piscatoria (2011)

Wolfgang Probst Ulrich Berth Daniel Stepputtis Cornelius Hammer

Background. The data collection of commercial fisheries has been formalized by the EU data collection framework (DCF). Besides gaining relevant information to fisheries management under the Common Fisheries Policy, the data of the DCF will gain importance in assessing the impacts of fishing on the ecosystem of the Baltic Sea. Materials and methods. The catch of the demersal German Baltic Sea trawl fleet between 2006 and 2009 was sampled by on-board observers to investigate the temporal and spatial patterns in catch composition. Results. There was a general increment in tow duration, landing weights, and discard weights from west to east. The most important species by catch weight was cod, for which highest catches were obtained during spring in ICES subdivision 25. Single hauls exceeded 25 h and caught more than 9900 kg of cod. On average, about 5%, 13%, and 20% and of the captured cod, flounder, and dab, respectively, were discarded. Conclusion. The presently reported study provides a benchmark for the German Baltic Fisheries that can be used for assessment of new management regulations and/or new marine policies. A comprehensive documentation of the spatial and temporal catch distribution of the German Baltic demersal trawl fleet, prior to the implementation of marine spatial planning measures such as marine protected areas or offshore wind farms, should help to evaluate the implications of intensifying spatial use on the fishing industry.

Demersal zone

Baltic sea

Marine ecosystem

Marine protected area

Marine Spatial Planning

Demersal fish

10.3750/aip2011.41.4.08

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Citations (5)