Mortality of pike-perch (Stizostedion lucioperca), brown trout (Salmo trutta) and landlocked salmon (Salmo salar m. sebago) caught as by-catch in pelagic trawling in a Finnish lake

Jurvelius, Juha; Riikonen, Raimo; Marjomäki, Timo J.; Lilja, Juha

doi:10.1016/s0165-7836(99)00116-2

Cited by 13 publications

(41 citation statements)

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“…A fish characteristic that explains mortality from trawls is fish length, with higher mortality in smaller than in larger individuals of several species including herring, sole and brown comber (Depestele et al, 2014, Düzbastilar et al, 2015, Düzbastilar et al, 2010a, Düzbastilar et al, 2010b, Hyvärinen et al, 2008 Suuronen et al, 2005, Suuronen et al, 1996a, Davis, 2007, Düzbastilar et al, 2010, Ingólfsson et al, 2007, Olla et al, 1997, Olla et al, 1998-Davis and Ottmar, 2006, Düzbastilar et al, 2010, Olla et al, 1997, Suuronen et al, 1996bDiscarded 0-100 Davis, 2007, Olla et al, 1997, Olla et al, 1998-Jurvelius et al, 2000, Ragonese and Morara, 2012, Davis, 2007, Depestele et al, 2014, Yergey et al, 2012, Olla et al, 1997Landed 0-100 Davis, 2007, Lambooij et al, 2012, Olla et al, 1997, Olla et al, 1998-Davis, 2007, Olla et al, 1997 Discarded 0-100 Drumhiller et al, 2014, Milliken et al, 2009, Wilson Jr and Burns, 1996-Wilson Jr and Burns, 1996, Stachura et al, 2012, ...…”

Section: Explanatory Variables For Mortality In Trawlsmentioning

confidence: 99%

“…Species is another fish characteristic that explains mortality from trawls, with higher mortality of walleye pollock than of sablefish (Olla et al, 1997), coho salmon, and particularly rock sole and Pacific halibut (Davis, 2007). Mortality after trawling is also higher in haddock than in cod (Digre et al, 2010), and in landlocked salmon than in pike-perch or brown trout (Jurvelius et al, 2000).…”

Section: Explanatory Variables For Mortality In Trawlsmentioning

confidence: 99%

“…Greater capture depth resulted in higher mortality of haddock (Ingólfsson et al, 2007), pike-perch (Jurvelius et al, 2000), sole (Depestele et al, 2014) and halibut (Richards et al, 1995). A larger change in water temperature due to higher temperatures of surface water resulted in higher mortality of several species including cod, plaice and sablefish , Hyvärinen et al, 2008, Olla et al, 1998, Suuronen et al, 2005, Van Beek et al, 1990.…”

Section: Explanatory Variables For Mortality In Trawlsmentioning

confidence: 99%

“…Changes in water temperature likely also explain the higher mortality of pike-perch after longer chilling in on-board water tanks (Hyvärinen et al, 2008). No relation between change in water temperature and mortality was identified in brown trout (Turunen et al, 1994), pike-perch, rainbow trout or landlocked salmon (Jurvelius et al, 2000). Longer fishing …”

Section: Explanatory Variables For Mortality In Trawlsmentioning

confidence: 99%

“…Gear characteristics: Gear subtype ± ± ± Gear modification ±, 0 ±, 0 ± Selectivity device ±, 0 ±, 0 Gear material ± Fish characteristics: duration resulted in higher mortality of several species including yellowtail flounder, sole and coho salmon (Barkley and Cadrin, 2012, Davis, 2007, Van Beek et al, 1990, but not of pike-perch (Hyvärinen et al, 2008, Jurvelius et al, 2000, rainbow trout or landlocked salmon (Jurvelius et al, 2000). Higher density in the net due to a higher catch weight resulted in higher mortality of Pacific halibut (Richards et al, 1995), sole (Depestele et al, 2014) and cod (Suuronen et al, 2005), but not herring (Suuronen et al, 1996a).…”

Section: Trawls Hooks Purse Seines Gillnets Traps Seinesmentioning

confidence: 99%

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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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