Additional File 1. Host Specificity, Distribution, Prevalence (P), Mean Abundance (MA)

Additional file 1. Host specificity, distribution, prevalence (P), mean abundance (MA)  SD and median abundance (M, shown if >0 only) of parasites in Gadus morhua from the Baltic, Celtic, Irish and North seas, Icelandic waters and Trondheimsfjord (Norway). New host records are marked with an asterisk. Abbreviations for host specificity categories: D: food content; G, generalist; GS, gadoid specialist. Abbreviations for distribution categories: A-B, Arctic-Boreal; B, Boreal; W, worldwide; NA, Not applicable. Region Baltic Sea Celtic Sea Icelandic waters Irish Sea North Sea Trondheimsfjord (sample size) (n = 180) (n = 138) (n = 165) (n = 136) (n = 147) (n = 60) Fish standard length (range in cm) 31.4-89.6 25-95.5 30.5-119.5 27.3-75 22.3-109.5 16.5-48 Parasite species Host Distribution P (%) P (%) P (%) P (%) P (%) P (%) specificity MA  SD MA  SD MA  SD MA  SD MA  SD MA  SD (M) (M) (M) (M) (M) (M) MONOGENEA Diclidophora merlangi GS A-B 0.7 0.7 0.01  0.09 0.01  0.08TREMATODA (metacercariae) Bucephalinae gen. sp. G NA 8.7 1.2 12.5 2.0 0.12  0.52 0.01  0.11 0.93  5.53 0.08  0.70Cryptocotyle lingua G A-B 1.4 0.01 ± 0.12Otodistomum sp. G NA 1.8 2.7 0.02  0.13 0.34  2.46Prosorynchoides gracilescens GS B 2.9 0.6 0.7 0.09  0.71 0.01  0.16 0.01  0.17Prosorhynchus crucibulum G NA 5.8 2.9 1.7 0.09  0.39 0.03  0.17 0.02  0.131 Region Baltic Sea Celtic Sea Icelandic waters Irish Sea North Sea Trondheimsfjord (sample size) (n = 180) (n = 138) (n = 165) (n = 136) (n = 147) (n = 60) * Rhipidocotyle sp. G NA 0.7 0.01  0.09TREMATODA (adult forms) Derogenes varicus G W 85.5 86.1 100 87.1 30.0 15.05  23.34 54.85  155.91 34.92  43.29 14.83 38.23 0.48  0.93 (6) (10) (20.5) (4) * Fellodistomum sp. G NA 0.6 0.01  0.08Gonocerca phycidis G W 10.1 23.5 0.7 0.14  0.44 1.07  4.08 0.01  0.08Hemiurus communis G B 0.6 49.3 75.0 48.3 50.0 0.01  0.07 3.20  10.29 8.40  26.00 4.73  20.29 1.90  3.12 (2) (0.5) Hemiurus levinseni G A-B 7.9 0.34  1.67Hemiurus luehei A B 5.2 10.9 0.10  0.44 0.78  4.04Lecithaster sp. ?gibbosus G A-B 0.7 0.7 0.03  0.34 0.02  0.25Lepidapedon elongatum GS A-B 2.2 0.7 9.7 5.9 2.0 60.0 0.18  1.7 0.01  0.09 1.72  11.21 0.17  0.84 0.21  1.88 177.47  585.76 (2) Lepidapedon rachion GS B 2.2 1.8 2.2 45.0 0.06  0.43 0.05  0.42 0.05  0.39 49.42  191.242 Region Baltic Sea Celtic Sea Icelandic waters Irish Sea North Sea Trondheimsfjord (sample size) (n = 180) (n = 138) (n = 165) (n = 136) (n = 147) (n = 60) Opechona bacillaris G B 0.6 0.7 0.01  0.08 0.01  0.09Podocotyle reflexa G A-B 6.1 0.08  0.38Stephanostomum spp. GS B 21.0 3.6 29.4 40.1 1.41  5.53 0.07  0.40 1.85  7.39 4.69  14.68* Steringotrema sp. G NA 0.7 0.01  0.08CESTODA (larval forms) Grillotia sp. G NA 0.7 0.03  0.33Hepatoxylon sp. G NA 1.5 0.03  0.27Lacistorhynchus sp. G NA 2.9 5.2 2.0 0.11  0.79 0.06  0.27 0.02  0.14Scolex pleuronectis G W 0.6 2.2 0.01  0.08 0.02  0.15Pseudophyllidea fam. gen. sp. G NA 2.2 0.6 0.04  0.25 0.01  0.08* Schistocephalus gasterostei D 0.6 0.02  0.30Trypanorhyncha fam. gen. sp. G NA 4.4 1.2 5.2 3.4 0.06  0.31 0.01  0.11 0.07  0.30 0.14  1.063 Region Baltic Sea Celtic Sea Icelandic waters Irish Sea North Sea Trondheimsfjord (sample size) (n = 180) (n = 138) (n = 165) (n = 136) (n = 147) (n = 60) Unidentified plerocercoids G NA 0.6 1.4 0.01  0.08 0.02  0.18CESTODA (adult forms) Abothrium gadi GS B 16.7 3.6 22.1 5.4 0.21  0.50 0.04  0.19 0.31  0.66 0.05  0.23NEMATODA (larval forms) Anisakis simplex (s.l.) (L3) G A-B 15 92.0 99.4 36.0 50.3 5.0 2.37  13.25 74.89  134.59 327.29  433.06 4.65  42.41 34.33  127.02 0.05  0.22 (19.5) (121) (1) Contracaecum osculatum (s.l.) G A-B 53.9 72.5 94.6 62.5 15.7 8.3 (L3) 6.84  16.07 8.19  15.50 56.62  62.85 10.94  23.40 1.29  5.73 0.23  0.96 (1) (2) (34) (2) Hysterothylacium aduncum (L3) G A-B 41.7 68.8 97.6 72.8 78.2 65.0 1.83  5.49 11.28  20.80 37.9  35.71 11.85  20.67 11.95  39.37 1.20  1.47 (3.5) (28) (3.5) (4) (1) Hysterothylacium rigidum (L3) G B 40.6 52.2 6.7 8.1 23.1 8.3 6.34  51.17 14.57  36.15 0.37  2.47 0.20  0.95 1.33  7.19 0.12  0.42 (1) Pseudoterranova decipiens (s.l.) G A-B 3.9 51.5 52.7 22.1 12.9 1.7 (L3) 0.07  0.39 2.23  4.22 3.51  12.47 0.86  3.00 1.38  9.77 0.02  0.13 (7) (1) (1) Rhapidascaris sp. (L3) G NA 0.7 0.01±0.08NEMATODA (adult forms)Ascarophis morrhuae GS A-B 20.3 52.1 66.9 20.4 1.7 1.11  4.83 11.96  32.49 7.96  20.64 1.01  3.78 0.02  0.13 (1) (2)4 Region Baltic Sea Celtic Sea Icelandic waters Irish Sea North Sea Trondheimsfjord (sample size) (n = 180) (n = 138) (n = 165) (n = 136) (n = 147) (n = 60) Ascarophis crassicollis GS A-B 1.1 26.8 1.8 45.6 31.3 0.01  0.11 2.20  11.49 0.03  0.23 3.38  8.08 11.39  37.92Ascarophis filiformis GS A-B 0.7 7.9 2.9 0.01  0.09 0.18  1.01 0.03  0.17Capillaria gracilis G A-B 3.9 7.3 32.7 1.5 4.8 88.3 0.13  0.76 0.10  0.41 1.14  4.15 0.01  0.12 0.09  0.44 18.25  38.34 (8) Cucullanus cirratus GS A-B 71.0 79.4 53.7 55.1 93.3 4.80  9.29 6.74  9.21 3.38  10.29 3.24  7.21 14.32  19.43 (2) (3) (1) (1) (8) * Cucullanus sp. G NA 0.7 0.01  0.09Hysterothylacium aduncum G A-B 13.9 94.2 87.3 79.4 85.7 5.0 0.36  1.28 31.67  40.02 25.78  33.40 25.69  38.41 16.33  35.28 0.12  0.58 (19) (14) (13.5) (6) * Spinitectus sp. G NA 5.1 1.2 1.5 0.13  0.90 0.01  0.11 0.02  0.19ACANTHOCEPHALA (post-cystacanths) Corynosoma semerme G A-B 10.6 3.6 0.6 0.7 0.7 1.7 0.36  1.28 0.04  0.24 0.01  0.16 0.01  0.09 0.01  0.08 0.02  0.13Corynosoma strumosum G B 6.1 18.8 7.3 14.0 14.3 0.14  0.73 0.36  1.02 0.09  0.35 0.26  1.26 1.24  6.33ACANTHOCEPHALA (adult forms) Echinorhynchus gadi (s.l.) G A-B 88.3 5.1 53.9 12.5 28.6 30.0 32.24  44.79 0.16  1.30 4.55  9.87 0.29  1.42 2.35  9.02 0.48  1.02 (16) (1) HIRUDINEA (adult forms)5 Region Baltic Sea Celtic Sea Icelandic waters Irish Sea North Sea Trondheimsfjord (sample size) (n = 180) (n = 138) (n = 165) (n = 136) (n = 147) (n = 60) Calliobdella nodulifera G A-B 0.7 2.0 0.01  0.09 0.02  0.14Johanssonia arctica G A-B 0.6 0.01  0.08 COPEPODA (larval forms) Caligus sp. copepodite G NA 0.7 0.01  0.09Copepoda fam. gen. sp. G NA 0.7 copepodite 0.01  0.09COPEPODA (adult forms) * Acanthochondria soleae D 0.7 0.01  0.09Caligus curtus G A-B 1.5 3.6 16.2 9.5 0.01  0.12 0.06  0.38 0.65  2.97 0.27  1.56Caligus diaphanus A B 0.7 0.01  0.09Caligus elongatus G A-B 24.6 13.3 16.9 20.4 2.04  5.35 0.60  3.84 0.43  1.69 1.68  6.44* Chondracanthus ornatus A W 0.7 0.01  0.09Clavella adunca GS W 72.5 56.4 67.7 71.4 43.3 2.96  3.88 2.06  3.45 2.74  5.22 2.36  3.95 0.92  1.41 (2) (1) (2) (1)6 Region Baltic Sea Celtic Sea Icelandic waters Irish Sea North Sea Trondheimsfjord (sample size) (n = 180) (n = 138) (n = 165) (n = 136) (n = 147) (n = 60) Holobomolochus confusus GS B 1.7 0.02 0.13Lernaeocera branchialis G A-B 6.5 19.4 4.4 17.0 21.7 0.09  0.37 0.30  0.68 0.04  0.21 0.30  0.96 0.33  0.73AMPHIPODA Lafystius sturionis G A-B 0.7 1.27  15.42ISOPODA Gnathia elongata G A-B 0.7 1.8 (praniza larva) 0.01  0.09 0.02  0.197

Additional File 1. Host Specificity, Distribution, Prevalence (P), Mean Abundance (MA)

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