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

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

Oceanological and Hydrobiological Studies

Volume 47 (2018): Issue 2 (June 2018)

By: Katarzyna Najda, Agnieszka Kijewska, Tomasz Kijewski, Kęstas Plauška and Jerzy Rokicki

Open Access

|Jun 2018

Figures & Tables

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).

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

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

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
Liver	“shallow”	29.7	27.0	0	86.7
Stomach	“deep”	33.7	17.5	66.7	20.0
Stomach	“shallow”	32.5	11.2	100.0	0
Intestine	“deep”	23.7	56.4	0	20.0
Intestine	“shallow”	33.9	61.3	0	13.3
Body cavity	“deep”	1.1	0	0	0
Body cavity	“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

DOI: https://doi.org/10.1515/ohs-2018-0014 | Journal eISSN: 1897-3191 | Journal ISSN: 1730-413X

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Language: English

Page range: 128 - 139

Submitted on: Aug 26, 2017

Accepted on: Jan 3, 2018

Published on: Jun 18, 2018

Published by: University of Gdańsk

In partnership with: Paradigm Publishing Services

Publication frequency: 4 issues per year

Keywords:

Greenland halibut

Related subjects:

Chemistry, other,

Geosciences, other,

Life sciences, other

© 2018 Katarzyna Najda, Agnieszka Kijewska, Tomasz Kijewski, Kęstas Plauška, Jerzy Rokicki, published by University of Gdańsk
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License.

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