Daniel Stepputtis
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View article: An analysis of stakeholders’ vision of the future of coastal fisheries in Germany
An analysis of stakeholders’ vision of the future of coastal fisheries in Germany Open
Coastal fisheries in Germany are undergoing significant structural changes. Key challenges include the declining productivity of commercially important fish and shellfish stocks, the loss of traditional fishing grounds, a dwindling interes…
View article: Annex A-C: List of Participants, Agenda, List of Documents
Annex A-C: List of Participants, Agenda, List of Documents Open
Annex A: List of Participants Annex B: Agenda Annex C: List of Documents How to cite: International Whaling Commission, 2023. Report of the Scientific Committee: Annex A-C. J. Cetacean Res. Manage. (Suppl.). 24: 191-206.
View article: WebGR - storing images of biological material and creating a framework to promote the implementation of sound statistical analysis in age calibration
WebGR - storing images of biological material and creating a framework to promote the implementation of sound statistical analysis in age calibration Open
No abstracts are to be cited without prior reference to the author.The objective of the WebGR project is to develop a set of web services to support the organisation and data analysis of calibration workshops, both for age and maturity inf…
View article: ICES-FAO Working group on fishing technology and fish behaviour (WGFTFB)
ICES-FAO Working group on fishing technology and fish behaviour (WGFTFB) Open
The Working Group on Fishing Technology and Fish Behaviour (WGFTFB) discusses and re-views research and practices of fishing technology and fish behaviour in relation to commercial and survey gears. The group provides guidance for manageme…
View article: The capability of square-meshes and fixed-shape meshes to control codend size selection
The capability of square-meshes and fixed-shape meshes to control codend size selection Open
Trawl codends are commonly made of diamond-mesh netting. However, diamond-mesh codends vary in mesh\ngeometry along its length and during fishing due to catch build up. This introduces variability in the size selection process. This phenom…
View article: Annex A-C: List of Participants, Agenda, List of Documents
Annex A-C: List of Participants, Agenda, List of Documents Open
How to cite: International Whaling Commission, 2022. Report of the Scientific Committee: Annex A-C. J. Cetacean Res. Manage. (Suppl.) 23: 172-198.
View article: Using an open source approach to remotely collect reliable environmental data
Using an open source approach to remotely collect reliable environmental data Open
<p>Environmental monitoring programs carried out by expeditions or autonomous stations are expensive and only allow measurements for discrete times and locations. After data acquisition most of the data needs hand-operated validation…
View article: Workshop on the Further Development of the New IBTS Gear (WKFDNG)
Workshop on the Further Development of the New IBTS Gear (WKFDNG) Open
The standard gear for the International Bottom Trawl Survey (IBTS), a fisheries-independent research survey originating from the 1960s, will be replaced. The long-term monitoring provides data on commercial pelagic and demersal fish specie…
View article: Estimating abundances of 0-group western Baltic cod\nby using pound net fisheries
Estimating abundances of 0-group western Baltic cod\nby using pound net fisheries Open
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 co…
View article: Hierarchical classification, counting and length measurement of fish using a stacking model approach
Hierarchical classification, counting and length measurement of fish using a stacking model approach Open
In this paper, the development of a hierarchical fish classification framework is presented. The conventional data collection technique for the commercial fish stock assessment is a labour intensive and time consuming procedure. The purpos…
View article: Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod (<i>Gadus morhua</i>)
Development and testing of fish-retention devices for pots: transparent triggers significantly increase catch efficiency for Atlantic cod (<i>Gadus morhua</i>) Open
Fish pots have lower catch efficiency than gillnets and trawls and, therefore, are rarely used for catching Atlantic cod (Gadus morhua) and similar species. Fish-retention devices (FRDs), non-return devices that permit fish to enter the po…
View article: Quantifying the performance of selective devices by combining analysis of catch data and fish behaviour observations: methodology and case study on a flatfish excluder
Quantifying the performance of selective devices by combining analysis of catch data and fish behaviour observations: methodology and case study on a flatfish excluder Open
This article describes a method for the quantitative analysis of fish behaviour relative to selection devices in trawl gears. Based on video observations, the method estimates probabilities for a given event to happen and establishes behav…
View article: Determination of Optimal Acoustic Passive Reflectors to Reduce Bycatch of Odontocetes in Gillnets
Determination of Optimal Acoustic Passive Reflectors to Reduce Bycatch of Odontocetes in Gillnets Open
The need to minimize bycatch of toothed whales (odontocetes) in gillnets has long been recognized, because they are often top predators and thus essential to ecosystem resilience. It is likely that a key to achieving this goal is the impro…
View article: Working Group on Electrical Trawling (WGELECTRA)
Working Group on Electrical Trawling (WGELECTRA) Open
The Working Group on Electrical Trawling (WGELECTRA) works on improving knowledge of the effects of electrical or pulse fishing on the marine environment. At the 2020 meeting, the working group considered the Scottish Ensis fishery, ongoin…
View article: REPORT ON EASTERN BALTIC COD BYCATCH IN NON-TARGETED FISHERIES, MIXING WITH WESTERN BALTIC COD IN SD24, AND STOCK SITUATION IN SDS 27-32
REPORT ON EASTERN BALTIC COD BYCATCH IN NON-TARGETED FISHERIES, MIXING WITH WESTERN BALTIC COD IN SD24, AND STOCK SITUATION IN SDS 27-32 Open
1. Bycatch of Eastern Baltic cod in non-targeted fisheries 1a.Total cod bycatch in 2018 was in the range of 360-1306 *tonnes in subdivisions 25-32 (eastern stock) and 66-417* tonnes in subdivision 24 (eastern and western stock combined). T…
View article: ICES-FAO Working Group on Fishing Technology and Fish Behaviour (WGFTFB)
ICES-FAO Working Group on Fishing Technology and Fish Behaviour (WGFTFB) Open
The aims of this workshop were to explain the new RDBES data model, assist in populating it with real data, and identify any issues or problems. The data model was explained using a combination of presentations and hands-on sessions. A set…
View article: The efficiency of sieve‐panels for bycatch separation in <i>Nephrops</i> trawls
The efficiency of sieve‐panels for bycatch separation in <i>Nephrops</i> trawls Open
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…
View article: Predictive framework for codend size selection of brown shrimp (Crangon crangon) in the North Sea beam-trawl fishery
Predictive framework for codend size selection of brown shrimp (Crangon crangon) in the North Sea beam-trawl fishery Open
The brown shrimp (Crangon crangon) fishery is of great socio-economic importance to coastal communities on the North Sea. The fishery is exploited by beam trawlers often using codends with very small mesh sizes, leading to concerns about c…
View article: Broadening the horizon of size selectivity in trawl gears
Broadening the horizon of size selectivity in trawl gears Open
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 altern…
View article: Danish seine - Ecosystem effects of fishing
Danish seine - Ecosystem effects of fishing Open
In 2014, the project “Danish seine – Ecosystem effects of fishing” got initiated in order to establish a better scientific understanding around Danish anchor seining and its effects on the environment. By comparing catch profiles of Danish…