Fig. 1.
Fig. 2.
Parasitic associations in Trachurus trachurus_
| Species composition | Number of infected hosts | P% | |
|---|---|---|---|
| n | P % | ||
| M. filiformis | 100 | 44.05 | 71.37 |
| E. lepidus | 27 | 11.89 | |
| P. polonii | 7 | 3.08 | |
| A. typicum | 20 | 8.81 | |
| P. chloroscombri | 8 | 3.52 | |
| M. filiformis - E. lepidus | 13 | 5.73 | 19.38 |
| M. filiformis - P polonii | 12 | 5.29 | |
| M. filiformis - A. typicum | 14 | 6.17 | |
| M. filiformis - P chloroscombri | 1 | 0.44 | |
| E. lepidus - A. typicum | 1 | 0.44 | |
| P. polonii - A. typicum | 3 | 1.32 | |
| M. filiformis - E. lepidus - P. polonii | 8 | 3.52 | 6.61 |
| M. filiformis - E. lepidus - A. typicum | 3 | 1.32 | |
| M. filiformis - P. polonii - A. typicum | 4 | 1.76 | |
| M. filiformis - E. lepidus - P. polonii - A. typicum | 4 | 1.76 | 2.64 |
| M. filiformis - E. lepidus - P. polonii - P. chloroscombri | 1 | 0.44 | |
| M. filiformis - E. lepidus - A. typicum - P. chloroscombri | 1 | 0.44 | |
Parasitism of Trachurus trachurus by Digenea across regions_
| Host | Regions | Number of hosts examined | Number of hosts infected | Number of parasites | Prevalence (P%) | Mean abundance (MA) | Mean intensity (MI) |
|---|---|---|---|---|---|---|---|
| Trachurus trachurus | Center | 726 | 209 | 953 | 29 | 1.31 | 4.56 |
| East | 68 | 13 | 41 | 19 | 0.60 | 3.15 | |
| West | 26 | 5 | 6 | 19 | 0.23 | 1.20 |
The relationship between parasite load and Trachurus trachurus weight and size_
| Mean Abundance | Mean Intensity | |||||||
|---|---|---|---|---|---|---|---|---|
| Weight (g) | Total length (cm) | Weight (g) | Total length (cm) | |||||
| rs | p | rs | p | rs | p | rs | p | |
| Monascus filiformis | 0.433 | 0.211 | 0.28 | 0.434 | -0.306 | 0.306 | -0.018 | 0.96 |
| Ectennrus lepidus | -0.759 | 0.011* | 0.049 | 0.894 | -0.895 | < 0.001** | -0.502 | 0.139 |
| Prodistomum polonii | -0.792 | 0.006** | -0.234 | 0.515 | -0.802 | 0.005** | -0.677 | 0.032* |
| Ancylocoelium typicum | -0.119 | 0.744 | 0.263 | 0.464 | -0.615 | 0.059 | 0.138 | 0.705 |
| Pseudopecoeloides chloroscombri | -0.768 | 0.009** | -0.314 | 0.377 | -0.787 | 0.007** | -0.444 | 0.199 |
Parasitological parameters of the Digenea species from Trachurus trachurus_
| Host | Parasites species | Number of hosts examined | Number of hosts infected | Number of parasites | Prevalence (P%) | Mean abundance (MA) | Intensity (MI) |
|---|---|---|---|---|---|---|---|
| Trachurus trachurus | Ectenurus lepidus | 820 | 58 | 75 | 7.07 | 0.09 | 1.29 |
| Prodistomum polonii | 39 | 159 | 4.76 | 0.19 | 4.08 | ||
| Monascus filiformis | 161 | 541 | 19.63 | 0.66 | 3.36 | ||
| Ancylocoelium typicum | 50 | 208 | 6 | 0.25 | 4.16 | ||
| Pseudopecoeloides chloroscombri | 11 | 17 | 1 | 0.02 | 1.55 |
Parasitological parameters of the Digenea found in Trachurus trachurus by season_
| Seasons | Autumn | Winter | Spring | Summer | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Parasitological parameters | P% | MA | MI | P% | MA | MI | P% | MA | MI | P% | MA | MI | |
| Parasites species | Ectenurus lepidus | 25 | 0.38 | 1.50 | 2 | 0.03 | 1.20 | 8 | 0.11 | 1.31 | 8 | 0.08 | 1.00 |
| Prodistomum polonii | 0 | 0.00 | 0.00 | 1 | 0.01 | 1.00 | 7 | 0.31 | 4.24 | 0 | 0.00 | 0.00 | |
| Monascus filiformis | 21 | 0.42 | 2.00 | 8 | 0.18 | 2.16 | 26 | 0.85 | 3.32 | 11 | 0.95 | 8.86 | |
| Ancylocoelium typicum | 0 | 0.00 | 0.00 | 0 | 0.00 | 0.00 | 10 | 0.41 | 4.29 | 3 | 0.03 | 1.00 | |
| Pseudopecoeloides chloroscombri | 0 | 0.00 | 0.00 | 1 | 0.02 | 2.50 | 2 | 0.02 | 1.33 | 0 | 0.00 | 0.00 | |
Analysis of seasonal variations in prevalence and abundance of digenea parasites in Trachurus trachurus using Chi-Square and Kruskal-Wallis tests_
| X2 | Kruskal-Wallis | |||
|---|---|---|---|---|
| Prevalence | Abundance | |||
| X | P | H | P | |
| Ectenurus lepidus | 21.085 | < 0.001* | 21.348 | < 0.001* |
| Prodistomum polonii | 19.288 | < 0.001* | 19.41 | < 0.001* |
| Monascus filiformis | 32.638 | < 0.001* | 32.607 | < 0.001* |
| Ancylocoelium typicum | 27.51 | < 0.001* | 27.588 | < 0.001* |
| Pseudopecoeloides chloroscombri | 2.307 | 0.511 | 2.293 | 0.514 |
Parasitism of Trachurus trachurus by Digenea across seasons_
| Host | Seasons | Number of hosts examined | Number of hosts infected | Number of parasites | Prevalence (P%) | Mean abundance (MA) | Mean intensity (MI) |
|---|---|---|---|---|---|---|---|
| Trachurus trachurus | Autumn | 24 | 7 | 19 | 29 | 0.79 | 2.71 |
| Winter | 226 | 27 | 54 | 12 | 0.24 | 2.00 | |
| Spring | 505 | 181 | 858 | 36 | 1.70 | 4.74 | |
| Summer | 65 | 12 | 69 | 18 | 1.06 | 5.75 |
Parasitological parameters of the Digenea found in Trachurus trachurus by regions_
| Areas | Center | East | West | |||||||
|---|---|---|---|---|---|---|---|---|---|---|
| Parasitological parameters | P% | MA | MI | P% | MA | MI | P% | MA | MI | |
| Parasites species | Ectenurus lepidus | 7 | 0.09 | 1.31 | 3 | 0.03 | 1.00 | 15 | 0.19 | 1.25 |
| Prodistomum polonii | 5 | 0.21 | 4.19 | 3 | 0.10 | 3.50 | 4 | 0.04 | 1.00 | |
| Monascus filiformis | 22 | 0.72 | 3.30 | 4 | 0.29 | 6.67 | 0 | 0.00 | 0.00 | |
| Ancylocoelium typicum | 6 | 0.27 | 4.80 | 13 | 0.16 | 1.22 | 0 | 0.00 | 0.00 | |
| Pseudopecoeloides chloroscombri | 1 | 0.02 | 1.60 | 1 | 0.01 | 1.00 | 0 | 0.00 | 0.00 | |
Analysis of regional variations in prevalence and abundance of digenea parasites in Trachurus trachurus using Chi-Square and Kruskal-Wallis tests_
| X2 | Kruskal-Wallis | |||
|---|---|---|---|---|
| Prevalence | Abundance | |||
| X | P | H | P | |
| Ectenurus lepidus | 4.508 | 0.105 | 4.545 | 0.103 |
| Prodistomum polonii | 0.608 | 0.738 | 0.585 | 0.747 |
| Monascus filiformis | 18.423 | < 0.001* | 17.922 | < 0.001* |
| Ancylocoelium typicum | 7.996 | 0.018* | 7.465 | 0.024* |
| Pseudopecoeloides chloroscombri | 0.369 | 0.831 | 0.368 | 0.832 |