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Distribution of ascaridoid nematodes (Nematoda: Chromadorea: Ascaridoidea) in fish from the Barents Sea

Katarzyna Najda
Katarzyna Najda
, 
Agnieszka Kijewska
Agnieszka Kijewska
, 
Tomasz Kijewski
Tomasz Kijewski
, 
Kęstas Plauška
Kęstas Plauška
 et 
Jerzy Rokicki
Jerzy Rokicki
   | 18 juin 2018
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Article Category: Original research paper
Publié en ligne: 18 juin 2018
Pages: 128 - 139
Reçu: 26 août 2017
Accepté: 03 janv. 2018
DOI: https://doi.org/10.1515/ohs-2018-0014
© 2018 Faculty of Oceanography and Geography, University of Gdańsk, Poland
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Figure 1

Map of the sampling area on the Barents Sea (checkerboard pattern). Fish were sampled along the shelf from Bear Island to South Svalbard. Greenland halibut nursery and main spawning grounds are marked. National economic zones, the disputed border areas between Norway and Russian (i.e. the Gray Zone), the international Loophole and the ICES areas are shown (Nedreaas & Smirnov, modified).
Map of the sampling area on the Barents Sea (checkerboard pattern). Fish were sampled along the shelf from Bear Island to South Svalbard. Greenland halibut nursery and main spawning grounds are marked. National economic zones, the disputed border areas between Norway and Russian (i.e. the Gray Zone), the international Loophole and the ICES areas are shown (Nedreaas & Smirnov, modified).

Figure 2

Abundance calculated for nematode species sampled from fish species identified in both the northern and southern groups (R. hippoglossoides, S. mentella and H. platessoides) and at both depths (R. hippoglossoides, S. mentella and M. berglax). Values for nematode species are shown on separate graphs due to the large difference between the abundance level of the two common species and two much less abundant species.
Abundance calculated for nematode species sampled from fish species identified in both the northern and southern groups (R. hippoglossoides, S. mentella and H. platessoides) and at both depths (R. hippoglossoides, S. mentella and M. berglax). Values for nematode species are shown on separate graphs due to the large difference between the abundance level of the two common species and two much less abundant species.

Figure 3

Abundance of C. osculatum A and B from Greenland halibut depending on the location and depth
Abundance of C. osculatum A and B from Greenland halibut depending on the location and depth

Figure 4

Abundance of C. osculatum A and B per length class of R. hippoglossoides
Abundance of C. osculatum A and B per length class of R. hippoglossoides

Figure 5

Percentage of nematode species across the main locations in their host organisms. Calculations were carried out for all host species.
Percentage of nematode species across the main locations in their host organisms. Calculations were carried out for all host species.

Percentage of each ascaridoid species in organs of Greenland halibut by catch depth. The number of fish is given in Table 2

Nematode species A. simplex s.s. C. osculatum s.l. H. aduncum P. bulbosa
Liver “deep” 41.6 26.0 33.3 60.0
“shallow” 29.7 27.0 0 86.7
Stomach “deep” 33.7 17.5 66.7 20.0
“shallow” 32.5 11.2 100.0 0
Intestine “deep” 23.7 56.4 0 20.0
“shallow” 33.9 61.3 0 13.3
Body cavity “deep” 1.1 0 0 0
“shallow” 3.9 0.4 0 0

Abundance and prevalence of ascaridoids depending on the host and haul depth for R. hippoglossoides

N All species A. simplex s.s. C. osculatum H. aduncum P. bulbosa
Abundance
All fish 149 48.7 33.8 9.4 2.2 0.7
R. hippoglossoides all 110 52.0 36.1 11.2 < 0.1 0.5
 “shallow” 49 59.2 10.7 < 0.1 0.3
 “deep” 61 16.2 11.8 < 0.1 0.6
S. mentella 19 10.2 9.0 0.2 1.0 0.0
M. berglax 7 5.2 9.0 0.3 0.3 0.1
H. platessoides 6 29.0 7.5 12.8 0.0 8.7
G. morhua 7 192.3 126.7 13.0 51.5 1.2
Prevalence (%)
All fish 149 91 80 82 12 15
R. hippoglossoides all 110 100 81 97 3 14
 “shallow” 49 88 96 2 10
 “deep” 61 77 100 3 16
S. mentella 19 95 74 11 42 0
M. berglax 7 86 71 14 14 14
H. platessoides 6 100 67 83 0 67
G. morhua 7 100 100 100 100 50

Digestion patterns given as approximate lengths of the main DNA fragments (bp), which characterize three sibling species of C. osculatum s.l. The missing fragments are represented by short and not diagnostic fragments (total length).

 Contracaecum species RsaI XbaI
C. osculatum A 390 + 260 960
C. osculatum B 390 + 260 730+230
C. osculatum C 390 + 260 + 240 960
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