Evaluation of the sieve net as a selectivity-improving device in the Belgian brown shrimp (Crangon crangon) fishery

Polet, Hans; Coenjaerts, J.; Verschoore, Reinhart

doi:10.1016/j.fishres.2004.04.007

Cited by 15 publications

(18 citation statements)

References 7 publications

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“…In Polet (2003), it was already concluded that the sieve net would be the better choice for the Belgian shrimp fishery compared to a sorting grid. Comparing electric fishing with the sieve net is difficult.…”

Section: Comparison With the Other Selective Devicesmentioning

confidence: 99%

On electrical fishing for brown shrimp (Crangon crangon)

Polet¹,

Delanghe²,

Verschoore

2005

Fisheries Research

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Section: Comparison With the Other Selective Devicesmentioning

confidence: 99%

On electrical fishing for brown shrimp (Crangon crangon)

Polet¹,

Delanghe²,

Verschoore

2005

Fisheries Research

Self Cite

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“…2), so that jellyfish would naturally move toward the outlet due to water resistance. The distance between the outlet and the sea bed was designed to be approximately 0.7 m. For the experiment, we attached a cover net [14,15], which had a 50 mm mesh opening as the same opening as the cod end, to the outside of the outlet to collect any jellyfish or fish that escaped through the outlet (Fig. 2).…”

Section: Experimental Netmentioning

confidence: 99%

“…http://www.fao.org/fishery/geartype/227/en) on the western coast of Korea have developed and adopted a jellyfish exclusion device that uses a conical separator, which is formed from an isosceles triangular or trapezoidal piece of netting. This cone-shaped separator works similar to sieve nets that are inserted in shrimp trawls to direct unwanted bycatch to an escape hole under the body of the trawl net [14,15]. Although the stow net is one of the fixed gears using tidal current, it appears to have almost the same characteristics as the trawl net in the hydrodynamic aspect.…”

Section: Introductionmentioning

confidence: 99%

Authors and their affiliations

Chan¹,

Chin²,

Nagami³

et al. 2015

Culture and Foreign Language Education

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Recently, the increasing population of giant jellyfish Nemopilema nomurai has negatively affected coastal fisheries in Korea. As a result, the fishing industry has begun developing devices to prevent jellyfish capture. In this study, we assessed the performance of a conical jellyfish exclusion device in the coastal areas of Yokji Island in southern Korea during 2009. After hauling, we measured the length, diameter, and weight of the jellyfish and fish that were captured by the cod end and cover net. We found that the captured species included N. nomurai, silver croakers Pennahia argentata, yellow croakers Larimichthys polyactics, shotted halibut Eopsetta grigorjewi, largehead hairtails Trichiurus lepturus, and melon seeds Psenopsis anomala. The catch ratios of the giant jellyfish that entered the cod end in terms of the weight ranged from 0.005 to 0.027. In contrast, the catch ratios of total fish in terms of the weight and number were 0.793 and 0.835, respectively. From the selectivity analysis of a conical separator for individual fish species, their exclusion ratios were independent of their length, and were similar to their observed exclusion ratios in terms of number. These results indicated that a conical jellyfish exclusion device performs well; however, some improvements are needed to minimize the escape of fish from the net.

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“…However, this visual contrast requires maintaining relatively bright illumination and clear water, which are limited at certain fishing depths or under cloudy conditions. Other researchers have used guiding panels or funnel nets in addition to square mesh windows or grid systems in the cod end to separate or guide fish from nephrops (Polet et al, 2004;Bahamon et al, 2007;Ferro and Kynoch, 2007). Despite the technological innovations described above, worldwide by-catch is estimated at about 20 million tons, although estimation is difficult for a variety of reasons (Chopin and Suuronen, 2009).…”

Section: Introductionmentioning

confidence: 99%

Performance of an Active Stimulating Device Using a Rope Kite or Array in the Cod End to Reduce Juvenile by-catch

Kim¹

2010

Fisheries and aquatic sciences

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An active stimulating device (ASD) using a rope apparatus may operated by the flow of turbulence inside a cod end, generating variable stimuli in addition to flow-related effects to minimize the bycatch of juvenile fishes. Preliminary testing involved a hydrodynamic effect inside the cod end with a rotating rope kite or conical rope array to generate variable stimuli (visual stimuli, water flow, or physical contact with fish) to change fish position. The experimental rope kite offered more choice in rotating period and range of sweeping action; adjusting the towing line or flow velocity helped to drive fish toward the net panel and encouraged escape. The conical shape of the rope array in the cod end helped to clear a path for fish by disturbing the rigging and providing more contrast between objects, preventing an optomotor response. This enabled more black porgy to be herded toward the net at an early stage of towing. Therefore, either a conical rope array or a rotating rope kite can be used as an effective ASD to prevent juvenile by-catch.

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Evaluation of the sieve net as a selectivity-improving device in the Belgian brown shrimp (Crangon crangon) fishery

Cited by 15 publications

References 7 publications

On electrical fishing for brown shrimp (Crangon crangon)

On electrical fishing for brown shrimp (Crangon crangon)

Authors and their affiliations

Performance of an Active Stimulating Device Using a Rope Kite or Array in the Cod End to Reduce Juvenile by-catch

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