Spawning location of Norway pout (Trisopterus esmarkii Nilsson) in the North Sea

Nash, Richard D.M.; Wright, Peter J.; Matějusová, Iveta; Dimitrov, Stefan Petev; O'Sullivan, Martha; Augley, Julian; Höffle, Hannes

doi:10.1093/icesjms/fss130

Cited by 6 publications

(4 citation statements)

References 20 publications

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“…Larval drift and dispersion from spawning grounds around the Shetland Isles is indicated by the general decline in larval abundance and diversity in parallel with an increase in larval mean lengths from these areas towards the East. Similar patterns have been suggested for Norway pout in other studies (Lambert et al 2009;Nash et al 2012).…”

Section: Discussionsupporting

confidence: 90%

Differences in vertical and horizontal distribution of fish larvae and zooplankton, related to hydrography

Höffle

Nash

Falkenhaug

et al. 2013

Marine Biology Research

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Section: Discussionsupporting

confidence: 90%

Differences in vertical and horizontal distribution of fish larvae and zooplankton, related to hydrography

Höffle

Nash

Falkenhaug

et al. 2013

Marine Biology Research

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“…Here, T represents mean temperature or temperature variability; i is the size class; s is the species and q is the quarter. Spawning aggregations have been found in all species in our study (Nash et al 2012, Heessen et al 2015, González-Irusta and Wright 2017 and are likely to shape the relationship between aggregation tendency and body size as well. We considered the effect of spawning aggregation by defining the 'spawning' variable as the quarter within the spawning period for each species.…”

Section: Relationship Between Size-based Aggregation Tendency and Body Sizesupporting

confidence: 60%

Hump‐shaped relationship between aggregation tendency and body size within fish populations

2021

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A distribution with high spatial variability may impair the bet-hedging capacity of a population, threatening population sustainability. Although the association between aggregation and life history traits of a species (e.g. body size) has been documented, the relationship between aggregation and size within a population has rarely been explored. As selective over-fishing may induce size truncation in the targeted stocks, it is critical to understand if such a truncation also undermines the distribution patterns of the population. In this study, we examined if and how the 'aggregation tendency' varies among different size classes of a population. Aggregation tendency was quantified as the exponent b of Taylor's power law (V = a × M b ), which measures the change in spatial variance (V) with the mean abundance (M) of a population. We estimated b by size class for each of the nine commercially important fish species in the North Sea, using ICES survey data from 1991 to 2015. Our study found that the relationship between b and body size within a population is hump-shaped, with a peak slightly larger than the 50% mature length of the species. This result indicates larger adults in a population tend to distribute less heterogeneously when abundance increases, suggesting that larger size classes play a critical role in reducing the variability of population distribution. Our findings highlight the importance of considering the combined effects of fishing-induced size truncation and changes in aggregation patterns in fishery management. That is, maintaining the size and spatial structure for the target stocks of selective fisheries is critical for the sustainability of the populations.

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“…Norway pout (Trisopterus esmarkii) is a small gadoid that rarely surpasses 5 years of age (Lambert et al, 2009;Nielsen et al, 2012). The North Sea stock is mainly found north of 57 N (Nielsen, 2016; Figure 1) and spawns along the eastern Scottish coast and between the Shetland and Norwegian coasts along the 120-m depth isobath (Huse et al, 2008;Lambert et al, 2009;Nash et al, 2012). Minor density-dependent patterns are observed in the population dynamics of the Norway pout stock (Kempf et al, 2009;Lambert et al, 2009), and a significant percentage of mortality is likely caused by spawning stress (Nielsen et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Opening of the Norway pout box: will it change the ecological impacts of the North Sea Norway pout fishery?

Bigné

Nielsen

Bastardie

2018

ICES Journal of Marine Science

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The small-mesh Norway pout (Trisopterus esmarkii) fishery intensified in the northern North Sea during the 1970s. Concerns about juvenile gadoid bycatch led to the “Norway pout box” closure along the Scottish coast in 1977. To assess the justification of the box today and the potential current impacts of opening the box, we evaluate the closure effects on selected fish stocks by analysing high-resolution research survey and commercial fishery data. The species- and size-specific distribution patterns in relation to environmental influencing factors are analysed for Norway pout and important bycatch species inside and outside the box. Relative distribution of benthic habitats is compared between inside–outside areas according to fish occurrence and fishery spatial footprint. No area differences in fish size composition are observed. However, species abundance depends significantly on habitat and depth whose area distribution is not homogenous. The current fishery is mainly in deeper, muddy seabeds. Haddock (Melanogrammus aeglefinus) and whiting (Merlangius merlangus) density is higher in shallow and sandy habitats, with a relatively larger area coverage inside the box. If a box opening implies relatively more fishery in those habitats, then increased bycatch can be expected. Consequently, closure of certain benthic habitats may instead be better management, opening new fishing opportunities without risk.

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Spawning location of Norway pout (Trisopterus esmarkii Nilsson) in the North Sea

Cited by 6 publications

References 20 publications

Differences in vertical and horizontal distribution of fish larvae and zooplankton, related to hydrography

Differences in vertical and horizontal distribution of fish larvae and zooplankton, related to hydrography

Hump‐shaped relationship between aggregation tendency and body size within fish populations

Opening of the Norway pout box: will it change the ecological impacts of the North Sea Norway pout fishery?

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