Hooking rate and bait loss rate of traditional hairtail hand line according to immersion time in the coastal waters of Jeju

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J. Kor. Soc. Fish. Tech., 45(2), 77 84, 2009 DOI:10.3796/KSFT.2009.45.2.077

*

Hooking rate and bait loss rate of traditional hairtail hand line according to immersion time in the coastal waters of Jeju

Byung-Yeob KIM, Young-Seok PARK¹and Chang-Heon LEE²*

Dept. of Marine Industrial Engineering, College of Ocean Science, Jeju National University, 690-756, Korea

1Fisheries Engineering Division, Resources Researches Institute, Jeju Special Self-Governing Provence, 699-814, Korea

2Training Vessel, College of Ocean Science, Jeju National University, 690-756, Korea

This paper is to investigate the effect of the immersion time in the traditional hairtail hand line for developing the fishing methods and the fishing gear in the coast of jeju. The operating of 32 times was made with each different immersion time of hairtail hand line, and the relations between the catch and the immersion time were examined. As the result, targeted species rate was over 98% of total catch. From about 800 seconds after casting, the hooking rate was decreased and the bite loss rate was increased, it seems to be made by the decreasing factors of predators including the cutting of branch lines etc. In addition, it was supposed that the hooking rate and the bait loss rate had a deep connection with feeding time zone. The level of the correlation coefficient of the bait loss rate according to the immersion time was 0.54 at p 0.01, in the case of the hooking rate, 0.59 was chosen after about 800 seconds. The hooking rate and the bait loss rate according to the hook number were not irrelevant to the fish school layer. Additionally, it was assumed that the bait loss rate was related to the depth of water.

Key words : Hairtail hand line, Hooking rate, Bait loss rate, Immersion time

*Corresponding author: [email protected], Tel: 82-64-754-3415, Fax : 82-64-756-3483

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(Hairtail, Trichiurus lepturus LINNAEUS)

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al.(1984)

Kim(1995)

, Takafumi et al.(1983b) Takafumi(1983)

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Kim and Lee(2009)

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.

2000 9 27

Fig. 1. Construct of traditional hairtail hand line used in Jeju(unit : mm).

Fishing pole Reel Rear main line

Front main line T type swivel Branch line

Hook Swivel Weight

Table 1. Specifications of materials for traditional hair- tail hand line(unit: mm)

Name Materials Dimension Quantity

Fishing pole Bamboo L 5,000 8,000 1

Reel Sponge φ 300 82 1

Rear main line PA mono-filament # 60 1 Front main line PA mono-filament # 35 40 1

T type swivel Steel # 8 10 15

Branch line PA mono-filament # 18 15

Hook Steel # 16 15

Swivel Steel # 5 0 1

Wight Lead 800g 1

2,600

2,700

60,000 80,0001,000 40,000 50,000 3,200 300

82 38

(3)

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Hr (1) .

Fh

Hr ____ 100% (1)

Ht

Bt

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Bl (2) .

Fig. 2. Construct of traditional hairtail hand line used for operating test.

No.13

No.1

(4)

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Bl (1 ____ 100%_B ) ⁽²⁾

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(1), (2) .

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20

Table 2. Hooking rate and bait loss rate according to immersion time of hairtail hand line.

Number of operating

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32

Mean 780 ^0.4_0.4 ^0.4_0.4 ^0.5_0.3 ^0.5_0.3 ^0.7_0.2 ^0.6_0.3 ^0.6_0.3 ^0.4_0.3 ^0.5_0.3 ^0.4_0.3 ^0.4_0.4 ^0.4_0.1 ^0.3_0.2 6 0.1 ^46.0 _71.2 Time of

Immersion (sec)

406 346 414 319 592 393 473 1,941

410 382 763 1,045

609 815 350 426 1,867

546 546 1,147

578 532 1,414 1,554 967 1,350 1,009 540 684 779 965 790

Bait loss rate(%) Hooking

rate(%)

40.0 38.5 67.5 30.8 84.6 76.9 75.0 69.2 59.6 38.5 59.6 61.5 69.2 23.1 86.5

100.0 38.5

15.4 38.5 15.4 9.6 53.8 57.7 23.1 82.7 84.6 82.7 53.8 65.4 30.8 63.5 46.2 48.1 69.2 76.9 69.2 90.4 30.8 61.5 30.8 75.0 7.7 51.9 53.8 53.8 46.2 88.5 69.2 90.4 46.2 92.3 61.5 90.4 30.8 90.4 46.2 30.8 53.8 82.7 23.1 78.8 92.3 94.2

78.8

Catches Hairtail other

3 5 4 10

9 5 7 3 5 2 1 7 3 11

7 4 6 9 9 4 4 1 7 6 9 6 8 4 6 7 3 12

1 0 0 0 0 0 1 0 0 0 1 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 Hook number

1 2 3 4 5 6 7 8 9 10 11 12 13

The number of fish Remain rate of bait

0.0 1 0.0 0 1.0 0 0.0 1 1.0 1 0.0 0 0.0 1 0.0 0 1.0 0 1.0 0 1.0 0 0.5 0 0.5 0 1.0 0 0.0 0 0.0 0 0.5 1 0.5 1 0.0 0 0.0 0 0.0 1 1.0 0 0.0 1 0.3 1 0.0 1 0.0 0 1.0 0 0.0 0 1.0 0 0.5 1 0.3 0 0.0 1

0.3 0 0.5 0 1.0 0 0.0 1 0.3 0 0.0 0 0.0 0 0.0 0 1.0 1 1.0 0 0.5 0 1.0 0 0.0 0 0.0 1 0.0 0 0.3 0 0.5 1 0.0 1 0.8 1 0.3 0 0.3 1 0.8 0 0.0 0 0.0 0 0.0 1 0.8 1 0.0 1 1.0 0 1.0 0 0.0 1 0.5 0 0.3 1

1.0 1 0.3 1 0.5 0 0.0 1 0.3 1 0.5 0 0.0 0 0.0 1 0.8 1 1.0 0 0.5 0 0.0 1 0.3 0 1.0 1 0.3 1 0.5 0 0.0 0 0.0 1 0.0 1 0.0 0 0.5 0 0.3 0 0.0 0 0.0 1 0.5 0 0.0 0 0.0 1 0.5 0 0.0 1 0.0 0 0.0 0 0.8 1

0.0 0 0.3 0 0.8 0 1.0 0 0.3 1 0.0 0 0.0 1 0.0 0 1.0 0 0.0 1 0.3 1 0.0 1 0.5 0 0.3 1 0.5 0 1.0 0 0.0 0 0.0 1 0.8 1 0.0 1 0.3 1 0.3 0 0.0 1 0.0 0 0.0 1 0.5 1 0.0 1 0.5 0 0.0 0 1.0 1 0.0 1 0.8 1

0.0 1 0.0 1 0.0 1 0.0 1 0.0 0 0.0 1 0.3 1 0.0 1 0.3 1 1.0 1 0.0 0 0.0 1 0.0 0 0.0 1 1.0 1 0.3 1 0.3 1 0.0 1 0.5 1 0.0 1 0.3 0 0.0 0 0.3 1 0.0 0 0.0 1 0.0 0 0.0 0 1.0 1 0.0 0 1.0 0 0.0 0 0.5 1

0.0 0 0.0 0 0.0 1 1.0 1 0.0 0 0.5 1 0.0 1 0.0 0 1.0 0 1.0 0 0.5 0 0.0 0 0.5 0 0.0 1 1.0 1 0.5 1 0.0 1 0.0 1 0.0 1 0.3 0 0.0 0 1.0 0 0.0 1 1.0 1 0.0 1 0.0 0 0.0 0 1.0 1 0.0 1 0.0 1 0.0 1 0.0 1

0.0 1 0.0 1 0.0 0 0.8 1 1.0 1 0.3 1 0.0 1 0.0 0 0.8 0 0.8 0 0.5 0 0.0 1 0.3 0 0.3 1 0.5 1 1.0 1 0.0 1 0.8 1 0.8 0 0.3 1 0.0 0 0.3 0 0.0 1 0.0 0 0.5 1 0.0 0 0.3 1 1.0 0 0.0 1 0.3 1 0.0 0 0.0 1

1.0 0 0.0 1 0.0 0 1.0 1 0.3 1 0.0 0 0.0 0 0.0 0 0.0 1 1.0 0 0.8 0 0.0 0 0.3 1 1.0 1 0.0 0 0.8 0 0.5 1 0.0 0 0.3 0 0.0 0 1.0 0 0.3 0 1.0 1 0.0 1 0.0 1 0.0 0 0.0 1 1.0 0 0.0 1 0.0 1 0.0 0 0.0 1

0.0 0 0.0 0 0.0 1 1.0 0 0.0 0 1.0 1 0.0 0 0.0 0 1.0 0 1.0 0 0.0 1 0.0 1 0.0 0 0.3 0 0.5 0 0.5 1 0.0 0 0.0 1 1.0 1 0.5 0 1.0 0 0.3 0 0.0 1 0.0 1 0.0 1 0.0 1 0.0 1 1.0 0 0.3 1 0.0 1 0.0 1 0.5 0

1.0 0 0.0 0 0.0 0 0.0 0 0.0 1 0.3 1 1.0 0 0.0 0 0.0 0 1.0 0 0.3 0 0.0 0 0.0 1 0.3 1 0.0 1 1.0 0 0.5 0 0.0 1 0.5 1 0.5 1 1.0 0 1.0 0 0.0 0 0.0 0 0.0 0 0.0 1 0.0 1 0.0 0 0.0 1 0.0 0 0.0 0 0.0 1

1.0 0 0.0 0 0.0 1 1.0 1 0.0 0 0.0 1 0.0 1 0.8 0 1.0 0 1.0 0 0.0 0 0.0 0 0.5 1 1.0 1 1.0 0 0.0 0 0.0 0 0.5 1 0.5 0 1.0 0 1.0 0 0.3 0 0.0 0 0.0 1 0.0 1 0.0 1 1.0 1 0.0 0 0.0 0 0.0 0 0.0 1

0.0 1 0.0 1 0.3 1 0.8 1 0.8 0 0.0 1 0.0 0 0.3 1 1.0 0 0.3 0 0.3 1 0.0 0 0.0 1 0.0 0 0.0 0 0.3 0 0.0 0 0.0 0 0.0 0 0.0 1 0.0 1 0.0 0 0.0 1 0.0 0 0.0 0 0.0 0 0.0 1 0.0 0 0.0 0 0.0 0 0.0 1

0.0 0 0.0 0 0.3 1 0.5 1 0.8 0 0.5 1 0.0 0 0.3 0 1.0 0 0.0 0 0.5 1 0.0 1 0.0 1 0.0 1 0.0 0 0.5 0 0.0 0 0.0 1 1.0 0 1.0 0 0.0 0 0.0 0 0.0 0 0.0 0 0.0 1 0.0 0 1.0 0 0.0 0 0.0 0 0.0 0 0.0 1

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10 40 .

190 98%

,

1 , 2

2%

.

,

. Fig. 3

, 800

.

0.59 0.01 .

1,941

100% ,

0.54 0.01

.

, ,

815

.

Fig. 4

3 .

, .

Fig. 3. Hooking rate and bait loss rate accord-ing to the time of immersion.

100 80 60 40 20 0

Rate(%)

Time of immersion(sec) Bait loss rate

r 0.26

r 0.59 r 0.54 Hooking rate

300 550 800 1050 1300 1550 1800

Fig. 4. Variation of bait loss rate according to the number of operating.

100 80 60 40 20 0

2500 2000 1500 1000 500 0

Bait loss rate(%) Time of immersion(sec)

Number of operating

Bait loss rate Time of immersion Moving avg. of bait loss rate Moving avg. of time of immersion

1 4 7 10 13 16 19 22 25 28 31 Operating time(hh:mm)

0:20 1:20 2:20 3:20 4:20 5:20 6:20 7:20 8:20 9:20 10:20

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, Taka-fumi et al.(1983a)

.

Fig. 5 .

3

, 8 , 12

, 7

32

. Fig. 3 Fig. 5

, Michio et al.(1980) 1977 12

, ,

. ,

.

, ,

.

,

, ,

,

.

, , ,

(Park et al., 2002).

, .

Fig. 5. Variation of hooking rate according to the number of operating.

100 80 60 40 20 0

2500 2000 1500 1000 500 0

Hooking rate(%) Time of immersion(sec)

Number of operating

Hooking rate Time of immersion Moving avg. of hooking rate Moving avg. of time of immersion

1 4 7 10 13 16 19 22 25 28 31 Operating time(hh:mm)

0:20 1:20 2:20 3:20 4:20 5:20 6:20 7:20 8:20 9:20 10:20

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,

. Fig. 6

, 1

13 4 7

. Fig. 1

40 50m

, 100m

, 4 7 60 70m

.

4 7 ,

. 40 50m

, Fig 6 5 ,

, Table 2

Fig. 6

. 7

. ,

.

, ,

(Huh, 1999).

, , , , ,

, ,

(Ochii and Tanaka,

1986). , ,

, .

.

,

.

Fig. 6. Hooking rate and bait loss rate according to hook , number.

100 80 60 40 20

01 3 5 7 9 11 13

Rate(%)

Hook number Bait loss rate Hooking rate

r 0.96

r 0.49

r 0.96

(8)

.

, 98%

, 0.54

. 800 0.59

, ,

,

.

, .

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2009 3 10

2009 5 3 1

2009 5 18 2

2009 5 18