Julia Calderwood

Marine Institute · Fisheries Ecosystems Advisory Services (FEAS)

The starfish, Asterias rubens, preys on mussels (Mytilus edulis), which are relaid during benthic cultivation processes. Starfish mops, a modified dredge used to remove starfish from mussel cultivation beds, are used in several fisheries today but few studies have attempted to quantify the effectiveness of this method in removing starfish. This stu...

The shore crab, Carcinus maenas, is recognized as a voracious predator of blue mussels, Mytilus edulis, having the potential to greatly reduce stocks in the benthic cultivation industry. As a consequence, baited crab pots are often deployed on and around cultivated benthic mussel beds to trap and remove crabs, in an attempt to reduce predatory pres...

Navigating the Future VI is a flagship foresight EMB Position Paper that explores the role of the Ocean in the wider Earth system and promotes collaboration between disciplines to tackle global issues. This document aims to influence and guide international, European and national research funding programmes, policy development and inspire the scien...

Our study investigated discarding patterns by bottom otter trawlers over 17 years prior to the full implementation of the Landing Obligation. A generalized additive modelling approach was applied to at-sea sampling data to examine the most important drivers of the discards per unit effort (DPUE) of cod, whiting, hake, and haddock in the Celtic Seas...

The importance of the integration of fishers' experiential knowledge (FEXK) into marine science is increasingly recognized. However, current integration attempts often focus on quantitative observational datasets, missing the unique information acquired by fishers throughout their lifetimes. Despite the potential value of FEXK, best practices aroun...

The EU Commission (EU DG MARE) has requested ICES advice on progress that has been made, or impact arising, from the use of innovative fishing gears within EU waters. Specifically, and to the extent possible, EU DG MARE seeks information on the type and range of innovative gears that are being used in commercial fisheries in the EU, the rationale o...

The ICES Workshop on developing guidance for ensuring the integrity of scientific information submitted to ICES by data providers (WKEnsure) convened to develop guidance for identifying, assessing and managing potential conflict of interest (CoI) in data and information provision that may affect the integrity of ICES science and advice. Such guidan...

The objective of WKFISHDISH2 was to develop a standardized and open-source way of routinely using trawl survey data to produce distribution maps which can be easily updated. To do so, workshop participants (i) reviewed models that can produce distribution maps from survey data in DATRAS and MEDITS formats, (ii) considered best practice guidance for...

Fishing industry stakeholders have unique and important contributions to make to fisheries research. Co-operative and collaborative research approaches between science and industry are important to facilitate the documentation of fishers’ knowledge and the co-creation of common understandings. Successful collaborations require open communication, t...

The objective of WKFISHDISH2 was to develop a standardized and open-source way of routinely using trawl survey data to produce distribution maps which can be easily updated. To do so, workshop participants (i) reviewed models that can produce distribution maps from survey data in DATRAS and MEDITS formats, (ii) considered best practice guidance for...

For future sustainable management of fisheries, we anticipate deeper and more diverse information will be needed. Future needs include not only biological data, but also information that can only come from fishers, such as real-time ‘early warning’ indicators of changes at sea, socio-economic data and fishing strategies. The fishing industry, in ou...

Smartphones are increasingly the most common type of mobile phone used throughout the world, offering users the ability to browse the internet and access mobile applications. Smartphones are also often equipped with high definition digital cameras, accelerometers, gyroscopes, and GPS. They can, therefore, facilitate the collection and dissemination...

Avoiding unwanted catches and reducing discards is an important objective of fisheries management. Fishers can avoid unwanted catches to some extent by improving selectivity of their fishing operations. This can be achieved through technical measures and gear modifications but also by adjusting when and where fishing takes place. Having access to r...

The Workshop on the production of annual estimates of abundance of sensitive species (WKABSENS) met to define sensitive species, collate ICES assessments of abundance where these are available, and estimate indices of their abundance per swept-area where not, for the OSPAR area. The analyses identified 140 potentially sensitive species or species c...

The ICES Workshop on Stakeholder Engagement Strategy (WKSHOES) met online 22-24 June 2021 with the objective to organize the background information needed for SCICOM and ACOM to develop a formal ICES Stakeholder Engagement Strategy. Stakeholder engagement has taken an increasingly important role in ICES. There was a strong consensus in the workshop...

50 days free download: https://authors.elsevier.com/c/1cGNG,714MghsI . Trials conducted on board industry vessels to test gears or alternative fishing tactics are often adopted to test selectivity measures in the field. A challenge trial was conducted on board an Irish demersal vessel in 2015 to assess the potential of tactical and behavioural chan...

The introduction of the Landing Obligation in Europe has increased the need for fishers to adopt more selective fishing practices, to avoid unwanted catches that would previously have been legally discarded. Modelling, experiments and trials have been conducted by scientists, often in collaboration with industry, to determine how gear modifications...

With the introduction of the Landing Obligation (LO) in EU fisheries, there is an increasing need for fishers to avoid unwanted catches while maximizing revenues. Improving understanding of the spatio-temporal dynamics of unwanted catches could assist the fishing industry optimize catches by altering where they fish. How following such advice relat...

Since 2015, the European Union gradually implemented the landing obligation (LO). This prohibits at-sea discarding of species under total allowable catch management. Spatiotemporal avoidance strategies and increasing fishing gear selectivity are two complementary levers that could help fishers in reducing the amount of discards. The objective of th...

The purpose of the Workshop on Science with Industry Initiatives (WKSCINDI) was to provide ICES with an up to date overview on the roles that industry can play in delivering scientific information relevant to ICES advice and marine research, and to develop a roadmap for taking measurable steps toward the inclusion and application of scientific data...

The 2019 meeting of WGECO was held at the International Council for the Exploration of the Sea, Copenhagen, Denmark from 8–16 April 2019. The meeting was attended by 16 delegates from eight countries and was chaired by Stefán Ragnarsson (Iceland) and Jeremy Collie (USA). The work conducted centred on three Terms of Reference that had been made by W...

As a result of the introduction of the Landing Obligation in European fisheries there is a need to equip industry with the tools and knowledge to avoid unwanted catches. Optimising fishing practices in terms of time and location fished have been acknowledged as being important in modulating catch composition. Mapping techniques used to identify and...

Under the Landing Obligation (LO) fishers will need to reduce or land fish that were previously discarded. In this chapter we look at how they might be able to do that by summarising a number of studies conducted in various European regions. We start by describing a series of “challenge” trials where fishers tried to reduce their discards by whatev...

The Irish fishing fleet is subject to monthly quotas which are designed to ensure an equal share between vessels and to spread uptake throughout the year. This monthly quota system also allows us to study the links between discarding and quota exhaustion once a month rather than once a year, as would be the case in most other countries. The hypothe...

Key findings:  Cod and haddock were the principal choke species for both the Nephrops and mixed demersal whitefish vessels.  The Nephrops vessel was able to reduce cod catches and mitigate the economic impact of the landing obligation, and a range of technical measures are available to further assist Nephrops vessels in this regard.  Similar to...

Shell fragmentation patterns that result from attacks by durophagous predators on hard-shelled marine invertebrates are a rich source of indirect evidence that have proved useful in interpreting predation pressure in the fossil record and recent ecology. The behaviour and effectiveness of predators are known to be variable with respect to prey size...