Appendix 7. SUMMARY OF SELECTIVITY DATA FOR EUROPEAN HAKE

(Merluccius merluccius linnaeus)

Author

Area

Experimental method

Gauge press

Cod end

50% retention length (cm)

Selection factor

material

average mesh
open. (mm)

Ancellin 1956

Biscay (off Belle-Ile)

Full cover

?

Single hemp

53.6

20.5

3.8

Celtic See

Full cover

?

Single hemp

72.4

31.7

4.4

Celtic See

Full cover

?

Double polyamide

78.7

39.5

5.0

Celtic See

Full cover

?

Single polyamide

59.4

32.0

5.4

Celtic See

Full cover

?

Double manila

76.0

34.0

4.5

Dardignac Hédé-Hauy & Portier 1968

Biscay (46°30’N:110 m)

Full cover

?

Double polyamide

62.8

29.1

4.6

Biscay (46°30’N:110 m)

Alternate hauls

2 kg

Double polyamide

62.8

28.9

4.6

Biscay (46°30’N:110 m)

Trouser cod-end

2 kg

Double polyamide

62.8

35.0

5.6

Dardignac et al. 1969

Biscay (46°30’N:140 m)

Topside cover

4 kg

Double polyamide

63.4

21.9

3.5

Biscay (46°30’N:140 m)

Topside cover

4 kg

Double polyamide

84.4

30.6

3.6

Biscay (46°30’N:140 m)

Topside cover

4 kg

Double polyamide

102.2

39.3

3.8

Biscay (46°37’N: 105 m)

Topside cover

4 kg

Double polyamide

62.2

21.3

3.4

Biscay (46°37’N: 105 m)

Topside cover

4 kg

Double polyamide

83.8

35.0

4.2

Biscay (46°37’N: 105 m)

Topside cover

4 kg

Double polyamide

100.6

39.3

3.9

Biscay (off Port Estaca)

Topside cover

4 kg

Double polyamide

83.4

28.9

3.5

Biscay (off Port Estaca)

Topside cover

4 kg

Double polyamide

99.2

38.8

3.9

Portuguese coast (off Berlingues)

Topside cover

4 kg

Double polyamide

84.1

26.9

3.2

Portuguese coast (off Berlingues)

Topside cover

4 kg

Double polyamide

99.5

35.9

3.6

Portuguese coast (off Berlingues)

Alternate hauls

4 kg

Double polyamide

99.5

48.8

4.9

Davis 1934

Celtic Sea (?)

Topside cover

?

Double sisal

~ 64

20.2

~ 3.2

Celtic Sea (?)

Topside cover

?

Double sisal

~ 88

28.1

~ 3.2

Gulland 1956

Celtic Sea (?)

Topside cover

7 lb

Double sisal

77

29.7

3.86

Celtic Sea (?)

Topside cover

7 lb

Double sisal

70

26.1

3.78

Celtic Sea (?)

Alternate hauls

7 lb

Double sisal

77

30.6

3.97

Lataconnoux 1955

Biscay (off Ile de Ré)

Alternate hauls

?

Single hemp

~ 60

27

~ 4.5

Biscay (off Ile de Ré)

Alternate hauls

?

Single hemp

~ 70

35

~ 5.0

Biscay (off Ile de Ré)

Alternate hauls

?

Single hemp

~ 80

42

~ 5.3

Belvèze H.

Moroccan Atlantic Coast
Off Casablanca

Alternate hauls

4 kg

Double polyester

47

14.5

3.1

Moroccan Atlantic Coast
Off Casablanca

Alternate hauls

4 kg

Single polyamide

68

29.5

4.3

Manteiro 1966

Portuguese coast (between Cape Rosso & C. Espichel)

Full cover

4,95 kg

Double manila

43.8

18.4

4.2

Portuguese coast (between Cape Rosso & C. Espichel)

Full cover

4,95 kg

Single polyamide

63.4

22.8

3.6

Portuguese coast (between Cape Rosso & C. Espichel)

Full cover

4,95 kg

Single polyamide

55.3

19.8

3.6

Rodriguez et al. 1963 & 1964)

Spanish Coast (off Vigo)

Cover

?

Single manila

~ 40

16.5

~ 4.1

Biscay (off S. Sebastian)

Alternate hauls

?

Single manila

~ 60

22.5

~ 3.8

Vasquez et al. 1975

Spanish coast (off Vigo)

Full cover

5 kg

Single polyethelene

53

12.8

2.42

Spanish coast (off Vigo)

Full cover

5 kg

Single polyethelene

67

17.7

2.64

Spanish coast (off Vigo)

Full cover

5 kg

Single polyethelene

74

24.2

3.27

Spanish coast (off Vigo)

Full cover

5 kg

Polypropylene

48

16.6

3.46

Robles et al. 1975

Spanish coast (off Vigo)

Full cover

4 kg

Single polyethelene

40

13.6

3.4

Spanish coast (off Vigo)

Full cover

4 kg

Double polyethelene

46

5.0

3.27

Lozano et al. 1968

Spanish coast (off Santander)

Full cover

4 kg

Single polyamide

~ 80

32

~ 4.0

Spanish coast (off Santander)

Full cover

4 kg

Single polyamide

~ 60

22

~ 3.7

Larrañeta et al. 1969

Spanish coast (off Valencia-Mediterranean Sea)

Full cover

1.5 kg

Single manila

38-52

12.6-16.4

3.26

Spanish coast (off Valencia-Mediterranean Sea)

Full cover

1.5 kg

Single polyethelene

42-52

11.2-15.2

2.76

Spanish coast (off Valencia-Mediterranean Sea)

Full cover

1.5 kg

Single polyamide

34-52

11.1-16.7

2.80-3.57

Vives & al. 1966

Spanish coast (off Tarragona-Mediterranean Sea)

Full cover

1.5 kg

Single manila

34

10

2.94

Spanish coast (off Tarragona-Mediterranean Sea

Full cover

1.5 kg

Single manila

40

16.5

4.1

Spanish coast (off Tarragona-Mediterranean Sea

Full cover

1.5 kg

Single manila

60

22.5

3.75

SOUTH AFRICAN HAKE (Merluccius m. capensis, Merluccius m. paradoxus)

Bohl et al. 1971

West coast of Southern Africa

Topside cover

4.0 kg

Double polyamide

111

41.2

3.70

West coast of Southern Africa

Topside cover

4.0 kg

Double polyamide

125

48.3

3.86

West coast of Southern Africa

Topside cover

4.0 kg

Double polyamide

117

36.9

3.15

West coast of Southern Africa

Topside cover

4.0 kg

Double polyamide

129

53.9

4.18

West coast of Southern Africa

Topside cover

4.0 kg

Double polyamide

117

39.5

3.36

Clark & Jensen 1963 - Silver hake

Off Cape Cod

Topside cover

12-15 lb

Single manila

94

28.4

3.0

Off Cape Cod

Topside cover

12-15 lb

Single manila

64

16.7

2.6

Off Cape Cod

Topside cover

12-15 lb

Double manila

115

38.7

3.4

Off Cape Cod

Topside cover

12-15 lb

Single polyamide

103

39.1

3.8

Off Cape Cod

Topside cover

12-15 lb

Single polyamide

103

38.6

3.7

Off Cape Cod

Topside cover

12-15 lb

Single polyamide

85

29.8

3.5

Off Cape Cod

Topside cover

12-15 lb

Single polyamide

82

27.7

3.4

Off Cape Cod

Topside cover

12-15 lb

Single polyamide

54

17.5

3.2

Off Cape Cod

Topside cover

12-15 lb

Single cotton

96

32.4

3.4

Off Cape Cod

Topside cover

12-15 lb

Single cotton

73

19.9

2.7

Off Cape Cod

Topside cover

12-15 lb

Single cotton

60

19.4

3.2

Jensen & Hennemuth 1963 - Silver hake

Gulf of Maine

Topside cover

4,4 kg

Single polyamide

52

15.8

3.0

Gulf of Maine

Alternate hauls

4,4 kg

Single polyamide

52

26.4

5.08

Gulf of Maine

Alternate hauls

4,4 kg

Single polyamide

73

30.4

4.16

Gulf of Maine

Alternate hauls

4,4 kg

Single polyamide

71

31.8

4.27

Gulf of Maine

Alternate hauls

4,4 kg

Single polyamide

71

29.3

4.13

Saetersdal & Villegas 1968 - Chilean hake

Golfo de Arauco

Alternate hauls

4 kg

Single polyester

97

37

3.8

Golfo de Arauco

Alternate hauls

4 kg

Single polyester

97

40

4.1

Golfo de Arauco

Alternate hauls

4 kg

Single polyester

97

39

4.0

Off Lebu

Alternate hauls

4 kg

Single polyester

97

42

4.3

Off Valparaiso

Alternate hauls

4 kg

Single polyester

96

37

3.9

Golfo de Arauco

Alternate hauls

4 kg

Single polyester

96

39.5

4.1

Near Isla Mocha

Alternate hauls

4 kg

Double polyester

68

27

4.0

Author	Area	Experimental method	Gauge press	Cod end		50% retention length (cm)	Selection factor
Author	Area	Experimental method	Gauge press	material	average mesh open. (mm)	50% retention length (cm)	Selection factor
Ancellin 1956	Biscay (off Belle-Ile)	Full cover	?	Single hemp	53.6	20.5	3.8
	Celtic See	Full cover	?	Single hemp	72.4	31.7	4.4
	Celtic See	Full cover	?	Double polyamide	78.7	39.5	5.0
	Celtic See	Full cover	?	Single polyamide	59.4	32.0	5.4
	Celtic See	Full cover	?	Double manila	76.0	34.0	4.5
Dardignac Hédé-Hauy & Portier 1968	Biscay (46°30’N:110 m)	Full cover	?	Double polyamide	62.8	29.1	4.6
	Biscay (46°30’N:110 m)	Alternate hauls	2 kg	Double polyamide	62.8	28.9	4.6
	Biscay (46°30’N:110 m)	Trouser cod-end	2 kg	Double polyamide	62.8	35.0	5.6
Dardignac et al. 1969	Biscay (46°30’N:140 m)	Topside cover	4 kg	Double polyamide	63.4	21.9	3.5
	Biscay (46°30’N:140 m)	Topside cover	4 kg	Double polyamide	84.4	30.6	3.6
	Biscay (46°30’N:140 m)	Topside cover	4 kg	Double polyamide	102.2	39.3	3.8
	Biscay (46°37’N: 105 m)	Topside cover	4 kg	Double polyamide	62.2	21.3	3.4
	Biscay (46°37’N: 105 m)	Topside cover	4 kg	Double polyamide	83.8	35.0	4.2
	Biscay (46°37’N: 105 m)	Topside cover	4 kg	Double polyamide	100.6	39.3	3.9
	Biscay (off Port Estaca)	Topside cover	4 kg	Double polyamide	83.4	28.9	3.5
	Biscay (off Port Estaca)	Topside cover	4 kg	Double polyamide	99.2	38.8	3.9
	Portuguese coast (off Berlingues)	Topside cover	4 kg	Double polyamide	84.1	26.9	3.2
	Portuguese coast (off Berlingues)	Topside cover	4 kg	Double polyamide	99.5	35.9	3.6
	Portuguese coast (off Berlingues)	Alternate hauls	4 kg	Double polyamide	99.5	48.8	4.9
Davis 1934	Celtic Sea (?)	Topside cover	?	Double sisal	~ 64	20.2	~ 3.2
Davis 1934	Celtic Sea (?)	Topside cover	?	Double sisal	~ 88	28.1	~ 3.2
Gulland 1956	Celtic Sea (?)	Topside cover	7 lb	Double sisal	77	29.7	3.86
	Celtic Sea (?)	Topside cover	7 lb	Double sisal	70	26.1	3.78
	Celtic Sea (?)	Alternate hauls	7 lb	Double sisal	77	30.6	3.97
Lataconnoux 1955	Biscay (off Ile de Ré)	Alternate hauls	?	Single hemp	~ 60	27	~ 4.5
	Biscay (off Ile de Ré)	Alternate hauls	?	Single hemp	~ 70	35	~ 5.0
	Biscay (off Ile de Ré)	Alternate hauls	?	Single hemp	~ 80	42	~ 5.3
Belvèze H.	Moroccan Atlantic Coast Off Casablanca	Alternate hauls	4 kg	Double polyester	47	14.5	3.1
Belvèze H.	Moroccan Atlantic Coast Off Casablanca	Alternate hauls	4 kg	Single polyamide	68	29.5	4.3
Manteiro 1966	Portuguese coast (between Cape Rosso & C. Espichel)	Full cover	4,95 kg	Double manila	43.8	18.4	4.2
	Portuguese coast (between Cape Rosso & C. Espichel)	Full cover	4,95 kg	Single polyamide	63.4	22.8	3.6
	Portuguese coast (between Cape Rosso & C. Espichel)	Full cover	4,95 kg	Single polyamide	55.3	19.8	3.6
Rodriguez et al. 1963 & 1964)	Spanish Coast (off Vigo)	Cover	?	Single manila	~ 40	16.5	~ 4.1
Rodriguez et al. 1963 & 1964)	Biscay (off S. Sebastian)	Alternate hauls	?	Single manila	~ 60	22.5	~ 3.8
Vasquez et al. 1975	Spanish coast (off Vigo)	Full cover	5 kg	Single polyethelene	53	12.8	2.42
	Spanish coast (off Vigo)	Full cover	5 kg	Single polyethelene	67	17.7	2.64
	Spanish coast (off Vigo)	Full cover	5 kg	Single polyethelene	74	24.2	3.27
	Spanish coast (off Vigo)	Full cover	5 kg	Polypropylene	48	16.6	3.46
Robles et al. 1975	Spanish coast (off Vigo)	Full cover	4 kg	Single polyethelene	40	13.6	3.4
Robles et al. 1975	Spanish coast (off Vigo)	Full cover	4 kg	Double polyethelene	46	5.0	3.27
Lozano et al. 1968	Spanish coast (off Santander)	Full cover	4 kg	Single polyamide	~ 80	32	~ 4.0
Lozano et al. 1968	Spanish coast (off Santander)	Full cover	4 kg	Single polyamide	~ 60	22	~ 3.7
Larrañeta et al. 1969	Spanish coast (off Valencia-Mediterranean Sea)	Full cover	1.5 kg	Single manila	38-52	12.6-16.4	3.26
	Spanish coast (off Valencia-Mediterranean Sea)	Full cover	1.5 kg	Single polyethelene	42-52	11.2-15.2	2.76
	Spanish coast (off Valencia-Mediterranean Sea)	Full cover	1.5 kg	Single polyamide	34-52	11.1-16.7	2.80-3.57
Vives & al. 1966	Spanish coast (off Tarragona-Mediterranean Sea)	Full cover	1.5 kg	Single manila	34	10	2.94
	Spanish coast (off Tarragona-Mediterranean Sea	Full cover	1.5 kg	Single manila	40	16.5	4.1
	Spanish coast (off Tarragona-Mediterranean Sea	Full cover	1.5 kg	Single manila	60	22.5	3.75
SOUTH AFRICAN HAKE (Merluccius m. capensis, Merluccius m. paradoxus)
Bohl et al. 1971	West coast of Southern Africa	Topside cover	4.0 kg	Double polyamide	111	41.2	3.70
	West coast of Southern Africa	Topside cover	4.0 kg	Double polyamide	125	48.3	3.86
	West coast of Southern Africa	Topside cover	4.0 kg	Double polyamide	117	36.9	3.15
	West coast of Southern Africa	Topside cover	4.0 kg	Double polyamide	129	53.9	4.18
	West coast of Southern Africa	Topside cover	4.0 kg	Double polyamide	117	39.5	3.36
Clark & Jensen 1963 - Silver hake	Off Cape Cod	Topside cover	12-15 lb	Single manila	94	28.4	3.0
	Off Cape Cod	Topside cover	12-15 lb	Single manila	64	16.7	2.6
	Off Cape Cod	Topside cover	12-15 lb	Double manila	115	38.7	3.4
	Off Cape Cod	Topside cover	12-15 lb	Single polyamide	103	39.1	3.8
	Off Cape Cod	Topside cover	12-15 lb	Single polyamide	103	38.6	3.7
	Off Cape Cod	Topside cover	12-15 lb	Single polyamide	85	29.8	3.5
	Off Cape Cod	Topside cover	12-15 lb	Single polyamide	82	27.7	3.4
	Off Cape Cod	Topside cover	12-15 lb	Single polyamide	54	17.5	3.2
	Off Cape Cod	Topside cover	12-15 lb	Single cotton	96	32.4	3.4
	Off Cape Cod	Topside cover	12-15 lb	Single cotton	73	19.9	2.7
	Off Cape Cod	Topside cover	12-15 lb	Single cotton	60	19.4	3.2
Jensen & Hennemuth 1963 - Silver hake	Gulf of Maine	Topside cover	4,4 kg	Single polyamide	52	15.8	3.0
	Gulf of Maine	Alternate hauls	4,4 kg	Single polyamide	52	26.4	5.08
	Gulf of Maine	Alternate hauls	4,4 kg	Single polyamide	73	30.4	4.16
	Gulf of Maine	Alternate hauls	4,4 kg	Single polyamide	71	31.8	4.27
	Gulf of Maine	Alternate hauls	4,4 kg	Single polyamide	71	29.3	4.13
Saetersdal & Villegas 1968 - Chilean hake	Golfo de Arauco	Alternate hauls	4 kg	Single polyester	97	37	3.8
	Golfo de Arauco	Alternate hauls	4 kg	Single polyester	97	40	4.1
	Golfo de Arauco	Alternate hauls	4 kg	Single polyester	97	39	4.0
	Off Lebu	Alternate hauls	4 kg	Single polyester	97	42	4.3
	Off Valparaiso	Alternate hauls	4 kg	Single polyester	96	37	3.9
	Golfo de Arauco	Alternate hauls	4 kg	Single polyester	96	39.5	4.1
	Near Isla Mocha	Alternate hauls	4 kg	Double polyester	68	27	4.0