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Parasitic load of the Pacific mackerel, Scomber japonicus (Pisces: Scombridae) from Northwestern Baja California, Mexico

M. Vivanco-Aranda
M. Vivanco-Aranda
, 
S. Tanahara
S. Tanahara
 and 
O. B. Del Rio-Zaragoza
O. B. Del Rio-Zaragoza
   | Dec 31, 2023
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Published Online: Dec 31, 2023
Page range: 370 - 379
Received: May 17, 2023
Accepted: Sep 28, 2023
DOI: https://doi.org/10.2478/helm-2023-0039
Keywords
© 2023 M. Vivanco-Aranda et al., published by Sciendo
This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.

Fig. 1.

Study area. a) Baja California Peninsula, Mexico, and b) detailed view of the Todos Santos Bay and bathymetry. The marks in blue represent the sampling points.
Study area. a) Baja California Peninsula, Mexico, and b) detailed view of the Todos Santos Bay and bathymetry. The marks in blue represent the sampling points.

Fig. 2.

Distribution of nematodes in different organs of the Pacific mackerel (Scomber japonicus) during Spring and Summer from Todos Santos bay, Baja California, Mexico.
Distribution of nematodes in different organs of the Pacific mackerel (Scomber japonicus) during Spring and Summer from Todos Santos bay, Baja California, Mexico.

Fig. 3.

Anisakis sp. found in the Pacific mackerel (Scomber japonicus). The anterior end with the boring tooth (a), ventriculus (b), and Posterior end with anus (c).
Anisakis sp. found in the Pacific mackerel (Scomber japonicus). The anterior end with the boring tooth (a), ventriculus (b), and Posterior end with anus (c).

Fig. 4.

Rhadinorhynchus sp. found in the Pacific mackerel (Scomber japonicus).
Rhadinorhynchus sp. found in the Pacific mackerel (Scomber japonicus).

Fig. 5.

Female of Caligus pelamydis found in the Pacific mackerel (Scomber japonicus).
Female of Caligus pelamydis found in the Pacific mackerel (Scomber japonicus).

Biological index of Pacific mackerel (Scomber japonicus) sampled during spring and summer.

Parameter Spring (n=47) Summer (n=57) P Value
Mean weight (g) 117.42 ± 42.33 118.12 ± 63.16 0.487
Mean length (cm) 24.49 ± 2.06 22.75 ± 4.69 0.071
CF 0.769 ± 0.10 0.936 ± 0.289 <0.001

Prevalence (P%), Abundance (A), and Intensity (I) of the parasites found in the Pacific mackerel Scomber japonicus collected from Todos Santos” bay, Baja California, during Spring and Summer

Spring (n=35) Summer (n =60)
Parasite species P % A I P % A I
Monogenea
Kuhnia scombri* 4.9 ± 16.6 0.59 ± 1.75 2.8 ± 2.9 0.05 ± 0.41 0.01 ± 0.12 1 ± 0
Digenea
Didymozoidae** 4.21 ± 14.2 1.7 ± 6.21 10 ± 12.6 1.3 ± 3.13 0.33 ± 0.7 1.54 ± 0
Cestoda
Tetraphyllidea** 0.11 ± 0.81 0.02 ± 0.14 1 ± 0 --- --- ---
Nematoda
Anisakis sp.** 90.1 ± 21.9 27.6 ± 29.9 28.1 ± 30 60.2 ± 48 8.25 ± 15 13.4 ± 16.5
Acanthocephala
Rhadinorhynchus sp.** 0.07 ± 0.52 0.02 ± 0.14 1 ± 0 1.66 ± 12.9 0.01 ± 0.1 1 ± 0
Copepoda
Caligus pelamydis* 0.62 ± 2.9 0.12 ± 0.53 2 ± 1 --- --- ---

Parasite species of the Pacific mackerel (Scomber japonicus) during Spring and Summer from Todos Santos bay, Baja California, Mexico.

Spring Summer
Parasite species PN DH PN DH
Monogenea
Kuhnia scombri* 28 G 1 G
Digenea
Didymozoidae** 80 S, IC, I 0 ---
Cestoda
Tetraphyllidea** 1 I 0 ---
Nematoda
Anisakis sp.** 1297 M, S, IC, I, L, MU, GN 515 M, S, IC, I, L
Acanthocephala
Rhadinorhynchus sp.** 1 I 1 I
Copepoda
Caligus pelamydis* 6 G 0 ---
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