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.
Table 1.
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 |
[i] Values represent means ± standard deviation; and P values from rank sum tests are also provided. Means with different superscripts letters are significantly different (P < 0.05) within the same parameter. CF=condition factor.
Table 2.
Parasite species of the Pacific mackerel (Scomber japonicus) during Spring and Summer from Todos Santos bay, Baja California, Mexico.
Table 3.
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 | --- | --- | --- |
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.
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).
Fig. 4.
Rhadinorhynchus sp. found in the Pacific mackerel (Scomber japonicus).
Fig. 5.
Female of Caligus pelamydis found in the Pacific mackerel (Scomber japonicus).