Table 2 Automatic feeder efficiency at different feed pellets sizes, air flow rates and rotational speeds of screw.

From: Evaluation of fish feeder manufactured from local raw materials

Feed pellets size, mm

Flow rate, m3 m−1

Rotational speed of screw, rpm

Mean

180

360

540

720

900

Efficiency of automatic feeder, %

1

10

37.03

47.02

62.26

60.76

62.47

53.91a

15

54.26

55.08

73.01

72.82

70.97

65.23b

20

76.07

69.20

82.18

76.30

80.14

76.78c

Mean

55.79a

57.10a

72.48b

69.96b

71.19b

 

2

10

39.96

58.29

75.21

70.66

71.56

63.14b

15

55.17

67.45

80.83

79.87

78.93

72.45bc

20

78.82

80.38

89.39

86.47

84.39

83.89d

Mean

57.98a

68.71b

81.81c

79.00b

78.29b

 

3

10

47.11

70.29

78.08

78.22

79.77

70.69b

15

66.17

80.01

84.99

88.21

86.55

81.19cd

20

94.95

95.04

95.32

93.99

93.41

94.54e

Mean

69.41b

81.78bc

86.13c

86.81c

86.58c

 

Mean of size (A)

65.30a

73.16b

82.14c

Mean of flow rate (B)

62.58a

72.95b

85.07c

Mean of speed (C)

61.06a

69.20b

80.14c

78.59c

78.69c

LSD at 0.05

A

B

C

AB

AC

BC

ABC

5.28

6.03

6.57

7.11

8.62

6.95

N.S

  1. Superscripts letters mean significantly between the treatments (statistical analysis).