Table 1 Geographic position of the sites in the southern Gulf of Mexico, where sediment, water, shoal flounders Syacium gunteri and cestodes Oncomegas wageneri were collected

1

-91.87749

19.063737

6

11.52 ± 0.32

100

97 ± 51

2

-92.924406

18.558687

10

10.41 ± 1.18

100

81 ± 35

3

-92.657425

18.691936

7

10.70 ± 1.42

43

19 ± 28

4

-92.460664

18.711013

4

8.05 ± 1.41

75

10 ± 9

5

-92.50014

19.187617

10

9.01 ± 0.89

80

29 ± 22

6

-91.500028

19.374545

1

23.30

100

13

7

-93.000353

18.753978

11

12.48 ± 1.23

89

73 ± 60

8

-95.501

19.001317

10

10.95 ± 1.17

80

8 ± 6

9

-92.500832

18.999193

9

12.47 ± 2.06

100

20 ± 22

10

-92.006873

18.999577

3

16.87 ± 4.59

67

62 ± 9

11

-91.501037

19.500352

4

23.38 ± 5.54

75

11 ± 13

12

-92.00304

18.937508

6

12.28 ± 0.47

100

94 ± 68

13

-92.375937

18.999565

6

11.18 ± 0.46

100

39 ± 14

14

-95.999833

19.501753

10

12.59 ± 1.31

60

61 ± 108

15

-94.25

18.233333

10

10.97 ± 1.15

80

13 ± 9

16

-92.15496

18.88098

9

11.00 ± 0.71

100

34 ± 15

17

-92.986852

18.483098

4

11.25 ± 0.26

100

110 ± 44

18

-93.00009

18.50345

11

11.35 ± 1.23

82

60 ± 40

19

-93.20285

18.62565

10

17.78 ± 5.62

80

22 ± 23

20

-92.81203

18.691928

11

9.81 ± 0.97

100

33 ± 27

21

-92.563643

19.126108

11

11.32 ± 1.88

90

37 ± 23

22

-92.50009

19.251617

6

13.37 ± 4.15

17

27

23

-92.18765

18.938898

4

10.74 ± 0.82

100

40 ± 46

24

-92.252252

18.772892

3

8.83 ± 2.48

100

25 ± 27

25

-92.12616

19.063458

5

14.16 ± 7.30

80

51 ± 53

26

-94.000493

18.375

6

15.13 ± 0.93

100

26 ± 30

27

-92.390441

18.68429

2

10.45 ± 5.65

100

43 ± 39

28

-92.063815

18.812852

4

10.90 ± 5.53

100

11 ± 7

29

-94.499377

18.753407

1

11.30

100

214