Survival of juvenile herring (Clupea harengas membras) after passing through a selection grid in a pontoon trap

Lundin, Mikael; Calamnius, Linda; Lunneryd, Sven-Gunnar

doi:10.1016/j.fishres.2012.05.009

Cited by 7 publications

(14 citation statements)

References 16 publications

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“…) and also for Atlantic herring ( Clupea harengus, Clupeidae) passing through a grid in a pontoon trap (Lundin et al . ). Hay et al .…”

Section: Reviewmentioning

confidence: 97%

“…; Lundin et al . ). High mortality (up to 100%) of sockeye salmon was recorded by Kreiberg and Blackburn () in laboratory trials of artificially gillnetted individuals exposed to 21 °C water, in contrast to zero post‐capture mortality at 17 °C.…”

Section: Reviewmentioning

confidence: 97%

“…Other organisms, including the target species, may escape during the fishing or hauling processes (Baker and Schindler ; Lundin et al . ), while some animals can easily remove and consume catches from gillnets (Gazo et al . ) or baits from traps (Noke and Odell ).…”

Section: Introductionmentioning

confidence: 99%

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Mitigating unaccounted fishing mortality from gillnets and traps

2013

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Gillnets and traps often are considered to have fewer holistic environmental impacts than active fishing gears. However, in addition to the targeted catches, gillnets and traps still cause unwanted mortalities due to (i) discarding, (ii) ghost fishing of derelict gear, (iii) depredation, (iv) escaping or dropping out of gear, (v) habitat damage, and potentially (vi) avoiding gear and predation and (vii) infection of injuries sustained from most of the above. Population‐level concerns associated with such ‘unaccounted fishing mortalities’ from gillnets and traps have been sufficient to warrant numerous attempts at mitigation. In this article, we reviewed relevant research efforts, locating 130 studies in the primary literature that concomitantly quantified mortalities and their resolution through technical modifications, with the division of effort indicating ongoing concerns. Most studies (85) have focused on discard mortality, followed by ghost‐fishing (24), depredation (10) and escape (8) mortalities. The remaining components have been poorly studied (3). All problematic mortality components are affected by key biological (e.g. species), technical (e.g. fishing mechanisms) and/or environmental (e.g. temperature) factors. We propose that these key factors should be considered as part of a strategy to reduce impacts of these gears by first assessing modifications within and then beyond conventional configurations, followed by changes to operational and handling practices. Justification for this three‐tiered approach is based not only on the potential for cumulative reduction benefits, but also on the likely ease of adoption, legislation and compliance.

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“…) and also for Atlantic herring ( Clupea harengus, Clupeidae) passing through a grid in a pontoon trap (Lundin et al . ). Hay et al .…”

Section: Reviewmentioning

confidence: 97%

Section: Reviewmentioning

confidence: 97%

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Mitigating unaccounted fishing mortality from gillnets and traps

2013

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“…In these tests non-commercial fish have been able to escape from the trap. There are also indications of a good survival rate after escape through a selection grid (Lundin et al, 2012). The captured fish have to find the escape route and manage to pass through the grid, by making active choices.…”

Section: Introductionmentioning

confidence: 99%

The efficiency of selection grids in perch pontoon traps

et al. 2015

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“…Fish length explains mortality from traps, with higher mortality in smaller than in larger pink snapper (Stewart, 2008), though the reverse is true for escaped herring (Lundin et al, 2012). Fish species also explains mortality from traps, with higher mortality of grey mullets than of ironfishes, common rudd and bleak (Gisbert and López, 2008).…”

Section: Explanatory Variables For Mortality In Trapsmentioning

confidence: 99%

Understanding social sustainability of capture fisheries

Boer¹,

Berentsen²,

Bokkers³

et al.

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Fishing companies are faced with decreasing profitability and increasing competition. These companies can try to gain a competitive advantage by differentiating their products, e.g. by marketing new product attributes that consumers are interested in such as attributes relating to sustainability. Although consumers could be considerably interested in social sustainability of fish, this sustainability dimension has received little research interest so far. The main objective of this thesis is to understand social sustainability of capture fisheries. Social sustainability can be understood by applying the framework for social sustainability assessment, which consists of stakeholder consultation and issue selection, indicator development and quantification, and interpretation of the results, to the case considered. The case considered in this thesis was capture fisheries in the northeast Atlantic. Stakeholder consultation resulted in the identification of 27 social sustainability issues relevant for capture fisheries in the northeast Atlantic. Overall, social sustainability issues concerning working conditions, employees' job fulfilment and fish welfare were seen as more important than other social sustainability issues. Indicators were defined for the most important social sustainability issues of capture fisheries in the northeast Atlantic. To interpret values for each indicator, rubrics were developed that articulated levels of performance. Application of these indicators and their accompanying rubrics to a Norwegian trawler demonstrated that the indicators and rubrics provide insight into social sustainability at the level of the vessel, which can be used to identify potential room for improvement. To determine whether social sustainability issues can be used for product differentiation, consumer interest in social sustainability issues of whitefish from the northeast Atlantic was studied. Results from a choice modelling survey demonstrated that consumers prefer the issue fish welfare over the issues product quality, worker safety and local employment. Given the lack of overview of the knowledge on fish welfare, the most important social sustainability issue for consumers, the literature on this topic was reviewed to determine how the capture process in capture fisheries affects fish welfare, using the indicators external injuries and mortality. This review showed that scale, skin and fin injuries occur more frequently in trawls, purse seines, gillnets, traps and seines than in hooks, whereas hooking injuries occur in hooks only. Pressure injuries can occur in all gear types when deployed at greater depth. Trawls, purse seines and seines result in higher mortality than gillnets, hooks and traps. Mortality appears to increase with decreasing fish length, and differs across fish species. A greater capture depth and a longer fishing duration were associated with more external injuries and higher mortality, whereas a large change in water temperature, a longer duration of air exposure and a high density in ...

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Survival of juvenile herring (Clupea harengas membras) after passing through a selection grid in a pontoon trap

Cited by 7 publications

References 16 publications

Mitigating unaccounted fishing mortality from gillnets and traps

Mitigating unaccounted fishing mortality from gillnets and traps

The efficiency of selection grids in perch pontoon traps

Understanding social sustainability of capture fisheries

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