Table 1.
Epidemiological parameters of Anisakis spp. and Hysterothylacium spp. infection, total and by catch zones, in wedge sole sampled in fishmarkets in Granada (Spain).
| Parameters | Both Zones | Zone 27.IXa | Zone 34.1.11 | |
|---|---|---|---|---|
| Host | ||||
| Wedge sole | No. of fish (F) | 110 | 70 | 40 |
| Mean weight ± SD (range) |
57.9 ± 38.0 (21.8–170.0) |
34.2 ± 6.8 (21.8–56.5) |
99.4 ± 34.4 *** (48.4–170.0) |
|
| Mean length ± SD (range) |
19.2 ± 3.1 (15.0–26.6) |
17.7 ± 1.1 (15.0–19.6) |
22.8 ± 2.0 *** (18.5–26.6) |
|
| Condition factor ± SD (range) |
0.72 ± 0.11 (0.56–1.11) |
0.67 ± 0.07 (0.56–0.94) |
0.81 ± 0.11 *** (0.60–1.11) |
|
| Parasites | ||||
| Ascaridoids | Prevalence (%) CI 95% |
12.7 0.08–0.20 |
5.7 1.6–14.0 |
25.0 ** 12.7–41.2 |
| Mean intensity (range) CI 95% |
1.07 (1–2) 1.00–1.21 |
1 (1) uncertain |
1.10 (1–2) ns 1.00–1.30 |
|
| Mean abundance CI 95% |
0.14 0.07–0.21 |
0.06 0.01–0.11 |
0.28 * 0.13–0.43 |
|
| Anisakis spp. | Prevalence (%) CI 95% |
4.5 0.02–0.10 |
0 0.0–5.1 |
12.5 ** 4.2–26.8 |
| Mean intensity (range) CI 95% |
1 uncertain |
0 nd |
1 (1) ns uncertain |
|
| Mean abundance CI 95% |
0.05 0.01–0.08 |
0 uncertain |
0.13 * 0.03–0.22 |
|
| Hysterothylacium spp. | Prevalence (%) CI 95% |
8.2 0.04–0.15 |
5.7 1.6–14.0 |
12.5 ns 4.2–26.8 |
| Mean intensity (range) CI 95% |
1.11 (1–2) 1.00–1.33 |
1 (1) uncertain |
1.2 (1–2) ns 1.00–1.40 |
|
| Mean abundance CI 95% |
0.09 0.04–0.15 |
0.06 0.01–0.11 |
0.15 ns 0.05–0.30 |
Weight in g, length in cm. Prevalence = 100·N/F, mean intensity = A/N, mean abundance = A/F; where F is the total number of fish, N is the number of infected fish, and A is the number of larvae. SD: standard deviation. CI: confidence interval. nd: not determined. A Student’s t-test comparison of the length, weight and condition factor between zones FAO 27.IXa and 34.1.11 showed high significance (*** p << 0.001). Comparison of the epidemiological parameters between zones: ** p < 0.01; * p < 0.05; ns, not significant.