The Fishing Mechanism of Fish Pots for Puffer.

Fuwa, Shigeru; Shimomura, Yoshitaka; Ishizaki, Munechika; Imai, Takehiko

doi:10.2331/suisan.60.455

Cited by 11 publications

(7 citation statements)

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“…The diameter of the outer funnel is 180 mm and the entrance ring frame was interconnected with 22 wires of 180 cm long and 1 mm in diameter. This trap is commonly used to catch puffer fish 10–14 …”

Section: Methodsmentioning

confidence: 99%

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Fundamental studies on the hydrodynamic resistance of small pot traps

2004

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The hydrodynamic resistance of small pot traps has been conducted in order to establish some basic information. The specific objectives of the study was to measure the hydrodynamic force and estimate the critical setting condition for traps. Five types of traps with different materials were used in the experiment: a netted semi-cylinder shape, a wire semi-cylinder shape, a heart shape, a box shape, and a cylinder shape. The hydrodynamic force of each trap was measured in a flume tank. Flow speeds in the flume tank were 0.1, 0.2, 0.3, 0.4, and 0.5 m/s. Attack angles for this study were 0, 15, 30, 45, 60, 75, and 90 degrees. At an attack angle of 0 degrees the main axis of the trap was parallel to the water flow and at 90 degrees it was vertical. The values of the hydrodynamic drag coefficient varied with traps: netted semi-cylinder shape, 2.75-5.96; wire semi-cylinder shape, 2.81-4.49; heart shape, 2.77-3.66; box shape, 2.39-2.97; and for cylinder shape, 3.57-3.67. The flow speed (0.5 m/s) was effective to set the netted semi-cylinder, wire semi-cylinder, box, and cylinder shaped traps. The same flow speed applied to the heart-shaped trap was only effective to a maximum of 30 degrees attack angles and below.

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Section: Methodsmentioning

confidence: 99%

“…This trap is commonly used to catch puffer fish. [10][11][12][13][14] The heart-shaped trap ( Fig. 1c) was constructed completely from bamboo strips.…”

Section: Experimental Materialsmentioning

confidence: 99%

Fundamental studies on the hydrodynamic resistance of small pot traps

2004

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“…The diameter of the outer funnel was 180 mm and the entrance ring frame was made of 22 wires 180 mm long and 1 mm diameter. This trap is commonly used to catch puffer fish in Kagoshima Prefecture 5–9 …”

Section: Methodsmentioning

confidence: 99%

“…This trap is commonly used to catch puffer fish in Kagoshima Prefecture. [5][6][7][8][9] The heart shaped trap was constructed completely from bamboo strips. This trap is usually used in Manado, North Sulawesi, Indonesia.…”

Section: Experimental Materialsmentioning

confidence: 99%

Fundamental study on the flow speed distribution around small traps

et al. 2005

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This study measured the flow speed distribution using actual small traps to investigate the effects of their materials and shapes by analyzing the characteristics of the water flow patterns around them. Five types of trap (netted semi-cylinder shaped, wire semi-cylinder shaped, heart shaped, box shaped, and a cylinder shaped traps) constructed from different materials were used in the experiment. The flow speed distribution around each trap was measured in a flume tank. Flow speeds in the flume tank were 0.1, 0.2, 0.3, and 0.4 m/s. The webbing of the traps was different in shape and had various diameters of twine. The diameters of twine ranged from 0.55 to 1.00 mm. The relationship between the solidity ratio of the twine and flow distribution of the traps was also analyzed. For the netted semi-cylinder shaped and cylinder shaped traps, the area of reduced flow speed extended along the downstream area and its width slightly increased with distance from the trap's entrance. The heart shaped trap is shown to have the largest solidity ratio and this resulted in a high reduction of the flow speed downstream from the trap.KEY WORDS: flow ratio, flow speed distribution, solidity ratio, trap.

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“…Traps are widely used in fisheries throughout the world because of their simple structure and convenient operation. However, many factors affect the catch rate of traps, and the most important factor is the trap entrance 1–11 . The entrance number, shape, size and location significantly affect the catch.…”

Section: Introductionmentioning

confidence: 99%

Effects of entrance design on catch efficiency of arabesque greenling traps: a field experiment in Matsumae, Hokkaido

Yamamoto

Hiraishi

et al. 2006

Fisheries Sci

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A field experiment was conducted in the Matsumae area of Hokkaido, Japan, during June and July 2002, to investigate the effects of different entrance designs on the catch efficiency of fish traps by fishing with commercial traps (entrance inclination angle [ α ] = 37 ° ; funnel length of entrance [ L f ] = 22 cm) and experimental traps. The experimental traps were of the same size and similar design as commercial traps, with different entrance inclination angles (trap E1: α = 46 ° ; E2: α = 27 ° ; E3: α = 0 ° ; all L f = 22 cm) or funnel lengths (E4: α = 37 ° , L f = 8 cm). In total, 2200 fish during 200 trap hauls were captured. The catch was significantly higher using both traps E2 and the commercial trap than with trap E3 ( P < 0.05), and the catch of trap E2 was higher than that of the commercial trap. There were no significant differences in mean fish body length or the frequency distributions of body length among trap types (E1, E2, E3 and commercial). The funnel length of the entrance also affected the catch of traps. Trap E4 had significantly higher catches than the commercial trap ( P = 0.04) when traps were deployed for a 1-day soak time. Fish body length frequency distributions did not differ between trap E4 and the commercial trap. The results showed that catch can be greatly affected by trap entrance designs.

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The Fishing Mechanism of Fish Pots for Puffer.

Cited by 11 publications

References 0 publications

Fundamental studies on the hydrodynamic resistance of small pot traps

Fundamental studies on the hydrodynamic resistance of small pot traps

Fundamental study on the flow speed distribution around small traps

Effects of entrance design on catch efficiency of arabesque greenling traps: a field experiment in Matsumae, Hokkaido

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