Long‐term changes in the feeding of <i>Pollachius virens</i> on the Scotian Shelf: responses to a dynamic ecosystem

Carruthers, Erin H.; Neilson, John D.; Waters, C.; Perley, Peter

doi:10.1111/j.0022-1112.2005.00594.x

Cited by 22 publications

(20 citation statements)

References 35 publications

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“…saithe and cod) would not normally exceed 0.1 to 5 km (e.g. Aabel et al 1997, Uglem et al 2008). However, no fishery and survey vessels are currently permitted to operate closer than 0.5 km to any oil and gas platforms in the North Sea due to stringent safety regulations (0.5 km safety zones).…”

Section: Discussionmentioning

confidence: 99%

“…Interestingly, large aggregations of both T. esmarkii and mackerel have also been frequently observed near the North Sea oil platforms (e.g. Aabel et al 1997, Guerin 2009), and their occurrences may therefore be explained by the potential association between the local availability of euphausiids and the physical presence of the offshore platforms. In addition, the significant reduction of the proportion of T. esmarkii in the saithe stomach contents in Cluster 4M may be attributable to the enhanced availability of euphausiids around the offshore structures, which Table 5, symbols as in Fig.…”

Section: Discussionmentioning

confidence: 99%

“…Aabel et al 1997, Guerin 2009, and therefore stomach contents data specifically for saithe in the wider North Sea were collected during the 2012 Q3 IBTS aboard the FRV 'Scotia' between 22 July and 11 August. A bottom trawl net (Grande Ouverture Verticale [GOV]) was used to sample demersal fishes at 85 stations across the North Sea.…”

Section: Sampling In the Ibts Survey On The Frv 'Scotia'mentioning

confidence: 99%

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Potential influence of offshore oil and gas platforms on the feeding ecology of fish assemblages in the North Sea

Fujii¹

2016

Mar. Ecol. Prog. Ser.

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This article presents results from the first detailed study on the feeding habits of fish assemblages associated with offshore oil and gas platforms in the North Sea. Multi-seasonal sampling was conducted at one of the oil platforms located in the central North Sea between September 2010 and January 2014 to characterise temporal variation in the stomach contents of different fish species. A total of 6 fish species were recorded, including commercially important gadoids such as saithe Pollachius virens, haddock Melanogrammus aeglefinus and cod Gadus morhua. Saithe fed predominantly on euphausiids and haddock consumed a large proportion of ophiuroids, whereas cod were mainly piscivorous. The prey compositions were significantly different between species, indicating the presence of interspecific prey resource partitioning among those species. To further investigate possible links between the feeding habits of the most dominant fish species, saithe, and the physical presence of offshore platforms across the North Sea, a separate set of stomach data was collected during the 2012 Quarter 3 International Bottom Trawl Survey aboard the FRV 'Scotia'. The multivariate analysis of both data sets showed that the observed spatio-temporal variability in the saithe diet was significantly explained by proximity to the nearest offshore platforms and changes in water temperatures, which appear to reflect patterns of euphausiid availability over space and time. The physical presence of the offshore structures may potentially affect the distribution/availability of zooplankton (i.e. euphausiids) and thereby influence the feeding behaviour of saithe and any other marine populations that are interconnected to the dynamics of such trophic interactions.

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Section: Discussionmentioning

confidence: 99%

Section: Discussionmentioning

confidence: 99%

Section: Sampling In the Ibts Survey On The Frv 'Scotia'mentioning

confidence: 99%

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Potential influence of offshore oil and gas platforms on the feeding ecology of fish assemblages in the North Sea

Fujii¹

2016

Mar. Ecol. Prog. Ser.

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“…Saithe can be found in far higher concentrations immediately beside and beneath salmon cages than just 25-200 m distance away from the nearest cage, most likely because they feed on waste fish food (Cromey et al 2002;Tuya et al 2006;Dempster et al 2010). Hence, wild Saithe that normally feed on crustaceans and fish (e.g., Du Buit 1991;Carruthers et al 2005) substitute , feed pellets for these natural items, when they aggregate at farms. This change in diet affects the chemical composition of the fish in a way that is similar to that seen in cultured fish species (Skog et al 2003;Fernandez-Jover et al 2011a).…”

Section: Discussionmentioning

confidence: 99%

Assessing the Influence of Salmon Farming through Total Lipids, Fatty Acids, and Trace Elements in the Liver and Muscle of Wild Saithe Pollachius virens

et al. 2015

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Saithe Pollachius virens are attracted to uneaten salmon feed underneath cages at open‐cage salmon farms in Norway. The aggregated Saithe have modified their feeding habits as they have switched from wild prey to uneaten food pellets, which could lead to physiological and biochemical changes in the Saithe. Variations in profiles of total lipids, fatty acids, and trace elements in Saithe liver and muscle were measured to evaluate the influence of fish feed from salmon farms on wild Saithe populations. Farm‐aggregated Saithe had higher fat content in liver tissues than did individuals captured more than 25 km away from farms, but no clear differences were found in muscle tissues. High proportions of fatty acids of terrestrial origin, such as oleic, linoleic, and linolenic acids, in liver and muscle tissues of farm‐aggregated Saithe reflected the presence of wild Saithe at farms. Accordingly, low proportions of arachidonic, eicosapentaenoic, and docosahexaenoic acids in Saithe tissues mirrored the feeding activity at farms. Variations in specific trace element signatures among fish groups also revealed the farming influence on wild Saithe. High levels of Fe, As, Se, Zn, and B in liver, but also As, B, Li, Hg, and Sr in muscle of Saithe captured away from farms indicated the absence of feeding at farms. Received March 26, 2014; accepted December 10, 2014

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“…The lesser sandeel is a short-lived species. It comprises up to one-third of the total fishery yield in the North Sea (Arnott & Ruxton 2002) and is a major food source for several predatory fish (Carruthers et al 2005) and bird species (Furness 2002). Sandeels normally reproduce in their second year; they produce large demersal eggs and, because of extremely high natural mortality, do not live much longer than 3 yr. As a contrast to their larval performance we chose the temporally co-occurring dab, which spawns several times during its lifetime of around 10 yr, producing smaller pelagic eggs.…”

Section: Introductionmentioning

confidence: 99%

Comparative nutritional condition of larval dab Limanda limanda and lesser sandeel Ammodytes marinus in a highly variable environment

Malzahn¹,

Clemmesen

Wiltshire

et al. 2007

Mar. Ecol. Prog. Ser.

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We investigated the nutritional condition of larval fishes caught in daily ichthyoplankton hauls in the 'Helgoland Roads' (54°11.18' N and 07°54.00' E) from February to June 2004. We concentrated on larvae of dab Limanda limanda and lesser sandeel Ammodytes marinus in order to compare early life stages of iteroparous and nearly semelparous fish. We analysed length, weight and RNA:DNA ratios as a proxy for condition of the larvae. The relationship between larval nutritional condition and larval size provided an indication of condition-selective mortality due to a loss of larvae in poor condition from the larger size-classes. For the sandeel, larvae in good condition were present in all size-classes, whereas for the dab maximum larval condition increased with increasing size. Variability in both standard length and condition was high in the 2 species during their planktonic stage. Both species showed good nutritional condition in the early to mid portion of the recruitment period and declines in condition in late April. This was more pronounced in larval dab, which showed a higher dependency on feeding conditions than larval sandeel. Together, these findings indicate a more conservative strategy of early life stages of the nearly semelparous sandeel compared with the iteroparous dab.

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Long‐term changes in the feeding of Pollachius virens on the Scotian Shelf: responses to a dynamic ecosystem

Cited by 22 publications

References 35 publications

Potential influence of offshore oil and gas platforms on the feeding ecology of fish assemblages in the North Sea

Potential influence of offshore oil and gas platforms on the feeding ecology of fish assemblages in the North Sea

Assessing the Influence of Salmon Farming through Total Lipids, Fatty Acids, and Trace Elements in the Liver and Muscle of Wild Saithe Pollachius virens

Comparative nutritional condition of larval dab Limanda limanda and lesser sandeel Ammodytes marinus in a highly variable environment

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