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Commercial gillnetting is more stressful for saithe (Pollachius virens L.) than jigging: but is fillet quality affected?

Uglem, Ingebrigt; Toledo-Guedes, Kilian; Ulvan, Eva Marita
Journal article, Peer reviewed
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URI
http://hdl.handle.net/11250/2561430
Date
2016
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  • Publikasjoner fra CRIStin - NINA [2258]
  • Scientific publications [1286]
Original version
10.1051/alr/2016013
Abstract
Various fish capture methods, which involve different levels of pre-slaughter stress/welfare, could influence

the final quality of marketed fish. In this study, living saithe (Pollachius virens L.), caught during realistic commercial

fishing by gillnetting (n = 37) and automatic jigging (n = 50), were analysed for stress indicators in blood parameters.

An assessment of the fillet quality of the same fish, after four days storage on ice, was carried out using an Industrial

Test (IT) and a Quality Index Method (QIM). Stress indicators in gillnetted fish, such as lactate (7.5 ± 0.6 mmol/L),

haematocrit (33.9 ± 1.2%) and glucose (6.7 ± 0.7 mmol/L) were significantly higher when compared to jigged fish

(2.6 ± 0.2 mmol/L, 23.7 ± 0.7% and 3.3 ± 0.1 mmol/L, respectively), indicating higher stress levels for fish caught with

gillnets. No differences due to fishing gear were detected in the quality indexes, which seemed to be influenced by a

potential bias introduced when only fish hauled on board alive were analysed, and the limitations of the QIM and IT to

detect small differences in quality. Condition factor (K) was positively correlated with IT for gillnetted fish, but not for

jigged fish. This could also mask potential effects of capture methods on fillet quality. These results will be valuable

given emerging concerns on fish welfare in commercial fisheries and the need to deliver fish products with high quality

standards.
Journal
Aquatic Living Resources

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