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Table 2 Density index (N/km2), standard deviation (SD), coefficient of variation (CV) and frequency of occurrence (f) of P. erythrinus by stratum and in the overall bathymetric range for each survey

From: Distribution and biological features of the common pandora, Pagellus erythrinus (Linnaeus, 1758), in the southern Tyrrhenian Sea (Central Mediterranean)

Depth

Density index (N/km2)

Survey

1994

1995

1996

1997

1998

1999

2000

2001

2002

2003

2004

2005

2006

2007

2008

10–50 m

Mean

140

412

626

445

443

446

183

1028

1378

1605

388

239

371

159

94

SD

7

125

239

138

139

104

37

325

487

499

34

26

9

27

12

CV %

5

30

38

31

31

23

20

32

35

31

9

11

2

17

12

f

100

100

75

75

100

100

100

100

100

100

100

100

100

100

100

51–100 m

Mean

777

232

376

665

235

295

489

456

361

194

63

264

134

299

120

SD

227

91

158

236

93

99

158

152

83

49

8

106

28

115

6

CV %

29

39

42

35

39

34

32

33

23

25

12

40

21

38

5

f

50

50

25

50

50

100

100

100

100

100

100

33

67

67

100

101–200 m

Mean

67

140

0

0

45

19

64

35

0

0

0

15

27

11

12

SD

36

68

0

0

20

11

18

14

0

0

0

6

10

4

6

CV %

54

49

0

0

44

58

27

41

0

0

0

38

36

34

50

f

33

67

0

0

50

17

67

50

0

0

0

40

40

40

20

10–200 m

Mean

278

240

272

304

205

204

214

420

452

449

114

142

144

128

64

SD

134

89

149

146

89

81

88

195

255

274

40

56

36

60

13

CV %

48

37

55

48

43

40

41

46

56

61

35

40

25

47

21

f

54

71

29

36

64

64

86

79

55

55

55

55

64

64

64