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First analysis of digenean populations in Seriola dumerili (Risso, 1810), (Teleostei: Carangidae) from the Algerian Coast: New host record for Lecithocladium excisum (Rudolphi, 1819) Lühe, 1901 Cover

First analysis of digenean populations in Seriola dumerili (Risso, 1810), (Teleostei: Carangidae) from the Algerian Coast: New host record for Lecithocladium excisum (Rudolphi, 1819) Lühe, 1901

Helminthologia
Volume 62 (2025): Issue 2 (June 2025)
By: ,   and    
Open Access
|Sep 2025
Figures & tables

Figures & Tables

Fig. 1.

Lecithocladium excisum: (Lateral view), (C) Ceaca, (E) Eggs, (EC) Ecsoma, (O) Ovary, (OS) Oral sucker, (PP) Pars prostatica, (SV) Seminal vesicle, (T) Testes, (V) Vitellarium, (VS) Ventral sucker.

Fig. 2.

Parahemiurus merus: (Lateral view), (C) Ceaca, (E) Eggs, (EC) Ecsoma, (O) Ovary, (OS) Oral sucker (SV) Seminal vesicle, (T) Testes, (V) Vitellarium, (VS) Ventral sucker.

Fig. 3.

Tormopsolus orientalis: (Ventral view), (CS) Cirrus-sac, (E) Eggs, (ES) Eye-spot pigment, (O) Ovary, (OS) Oral sucker, (Ph) Pharynx, (SV) Seminal vesicle, (T) Testes, (V) Vitellarium, (VS) Ventral sucker.

Fig. 4.

Stephanostomum euzeti: (Ventral view), (CS) Cirrus-sac, (E) Eggs, (ES) Eye-spot pigment, (O) Ovary, (OS) Oral sucker, (Ph) Pharynx, (SV) Seminal vesicle, (T) Testes, (V) Vitellarium, (VS) Ventral sucker.

Fig. 5.

Bucephalus gorgon: (5.a) B. gorgon with expanded rynchus (lateral view), (5.b) B. gorgon with retracted rynchus (lateral view),(CS) Cirrus-sac, (E) Eggs, (M) Mouth, (O) Ovary, (Ry) Rynchus, (T) Testes, (Tt) Tentacule, (V) Vitellarium.

Table 1.

Digenean of Seriola dumerili from the Algerian coastline collected between March 2023 and February 2024.

SpeciesNumber of infested fishNumber of parasitesPrevalenceAbundanceIntensityRange of intensityClassification of the species in the community
% (CI)Mean ±SDMean ±SD
Lecithocladium excisum155412.40 (7.11-19.62)0.45±1.613.60±3.161-10Satellite
Parahemiurus merus328026.45 (18.84-35.24)0.66±1.582.50±2.211-9Satellite
Tormopsolus orientalis135710.74 (5.85-17.67)0.47±2.614.38±7.031-26Satellite
Stephanostomum euzeti6244.96 (1.84-10.48)0.20±1.014.00±2.531-8Satellite
Bucephalus gorgon104774485.95 (78.46-91.60)64.00±99.6474.46±103.821-562Core

1 CI: confidence intervals at 95%

1 SD: Standard deviation

Table 2.

Parasites associations of the digenean infesting Seriola dumerili.

Species number (P %)Species compositionNumber of infested hosts
nP %
1 (59.26 %)Bucephalus gorgon6055.56
Parahemiurus merus43.70
2 (26.85%)Bucephalus gorgon - Parahemiurus merus1513.89
Bucephalus gorgon - Tormopsolus orientalis54.63
Bucephalus gorgon - Lecithocladium excisum54.63
Bucephalus gorgon - Stephanostomum euzeti43.70
3 (10.2%)Bucephalus gorgon -Parahemiurus merus - Tormopsolus orientalis32.78
Bucephalus gorgon - Parahemiurus merus - Lecithocladium excisum65.56
Bucephalus gorgon - Lecithocladium excisum-Tormopsolus orientalis10.93
Bucephalus gorgon - Lecithocladium excisum - Stephanostomum euzeti10.93
4 (3.71%)Bucephalus gorgon - Parahemiurus merus - Lecithocladium excisum-Tormopsolus orientalis32.78
Bucephalus gorgon - Parahemiurus merus - Tormopsolus orientalis - Stephanostomum euzeti10.93
Table 3.

Information related to the weight classes of Seriola dumeríli.

Weight classesHost examinedDigenea Species
Lecithocladium excisumParahemiurus merusTormopsolus orientalisStephanostomum euzetiBucephalus gorgon
Host infestedNumber of parasitesHost infestedNumber of parasitesHost infestedNumber of parasitesHost infestedNumber of parasitesHost infestedNumber of parasites
138-254 g20265511009345
254.01-370.01 g4651211334900422245
370.02-486.02 g3052610304500302536
486.03-602.03 g50000002105568
602.04-718.04 g900452361381525
718.05-834.05 g6292714265463
834.06-950.06 g511001215562
Table 4.

Information related to the length classes of Seriola dumeríli.

Length classesHost examinedDigenea Species
Lecithocladium excisumParahemiurus merusTormopsolus orientalisStephanostomum euzetiBucephalus gorgon
Host infestedNumber of parasitesHost infestedNumber of parasitesHost infestedNumber of parasitesHost infestedNumber of parasitesHost infestedNumber of parasites
22.5-25.71 cm6000000002210
25.72-28.93 cm30411811330025784
28.94-32.15 cm4362213503900372191
32.16-35.37 cm20276103600181953
35.38-38.59 cm7002211021071061
38.60-41.81 cm113143732939111449
41.82-45.03 cm400000015496
Table 5.

Spearman’s correlation analysis of digenean species mean abundance and mean intensity with host parameters (weight and total length).

DigeneaMean abundanceMean intensity
Weight (g)Total length (cm)Weight (g)Total length (cm)
rsprsprsprsp
Lecithocladium excisum-0.1620.72801-0.2700.5580.0740.874
Parahemiurus merus-0.0900.84801-0.1090.81601
Tormopsolis orientalis0.6070.1480.3600.4270.4290.3370.2880.531
Stephanostomum euzeti0.7300.0630.7880.035*0.7940.033*0.8370.019*
Bucephalus gorgon0.0360.9390.1780.7020.1430.7600.1070.819

1 rs. Spearman’s coefficient; p. significance level;

1* . significant values p ≤ 0.05

Fig. 6

Species accumulation curve for the sampled Digenea from Seriola dumerili (n = 121) off the Algerian coast.

DOI: https://doi.org/10.2478/helm-2025-0017 | Journal eISSN: 1336-9083 | Journal ISSN: 0440-6605
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Language: English
Page range: 144 - 155
Submitted on: Jun 19, 2024
Accepted on: Jun 20, 2025
Published on: Sep 30, 2025
Published by: Slovak Academy of Sciences, Institute of Parasitology
In partnership with: Paradigm Publishing Services
Publication frequency: Volume open
Keywords:
Seriola dumerili,
Digenean,
L. excisum,
Teleost,
Algerian coastline
Related subjects:
Life sciences,
Zoology,
Ecology,
Life sciences, other,
Medicine,
Clinical medicine,
Microbiology, virology and infection epidemiology

© 2025 S. Amarache, A. Boukadoum, F. Tazerouti, published by Slovak Academy of Sciences, Institute of Parasitology
This work is licensed under the Creative Commons Attribution 4.0 License.

Volume 62 (2025): Issue 2 (June 2025)
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