Comparative fishing trials for invasive swimming crabs Charybdis japonica and Portunus pelagicus using collapsible pots

Archdale, Miguel Vázquez; Añasco, Cherry Pilapil; Hiromori, Shinji

doi:10.1016/j.fishres.2006.08.009

Cited by 24 publications

(4 citation statements)

References 14 publications

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“…competitive behaviors for food and space), size-specific distributions, and gear-specific factors (e.g. pot shape, volume, materials, entrance design and numbers) may also affect the entry and escape process when considering the passive capture characteristic of pot (Kim & Ko, 1987;Yamane & Hiraishi, 2002;Vazquez Archdale et al, 2003, 2007Montgomery, 2005;Vazquez Archdale & Kuwahara, 2005;Vazquez Archdale, Añasco & Hiromori, 2006;Butcher et al, 2012;Broadhurst, Butcher & Millar, 2017).…”

Section: Discussionmentioning

confidence: 99%

Improving size selectivity of round pot for Charybdis japonica by configuring escape vents in the Yellow Sea, China

Yu¹,

Zhang²,

Liu³

et al. 2021

PeerJ

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Sustainable development of the important economic species, Asian paddle crab (Charybdis japonica), has attracted attention in the coastal waters of the Yellow Sea, China. The commonly used round pots are almost nonselective, resulting in severe bycatch of juveniles. In this study, we explored a method to improve the size selectivity for C. japonica by mounting escape vents on the side panels of each pot. The selectivity of pots with escape vent sizes of 70 mm × 20 mm, 70 mm × 25 mm, 70 mm × 30 mm, and 70 mm × 35 mm was tested using a catch comparison method. The estimated minimum landing size (MLS) of carapace height (27 mm), according to the regulated MLS of carapace length (50 mm), was used as a reference point to explain the results. Significant increases in the size of crabs caught by pots were found with the enlargement of escape vent size (Kruskal–Wallis test, P < 0.01). The pots with 70 mm × 20 mm, 70 mm × 25 mm and 70 mm × 30 mm escape vents released nearly 50%, 75% and 95% of undersized individuals, respectively, and these three types of pots retained approximately 90% of legal-sized individuals compared with the control pots without escape vents. The pots with 70 mm × 35 mm escape vents released nearly all undersized individuals, but they also released most legal-sized individuals. Pots with an escape vent size of 70 mm × 30 mm were recommended for the sustainable development of C. japonica in the Yellow Sea of China. The results of this study reiterate the importance of carapace height for determining the size selectivity, which can serve as a reference to formulate management regulations in the coastal waters of the Yellow Sea, China.

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Section: Discussionmentioning

confidence: 99%

Improving size selectivity of round pot for Charybdis japonica by configuring escape vents in the Yellow Sea, China

Yu¹,

Zhang²,

Liu³

et al. 2021

PeerJ

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“…Leland et al (2013) also found round-shaped traps be more effective in catching BSC than were rectangular, wire and hoop nets. Funnel-type entrances tend to have higher catch efficiencies than have other types of trap entrances (Vazquez Archdale et al 2006, 2007Bergshoeff et al 2019). Previous experiments on the portunid Charybdis japonica (Asian Paddle Crab) found that funnel-type entrances had higher capture efficacies than did slit entrances because they were easier to enter without the chance of entanglement (Vazquez Archdale et al 2006).…”

Section: Sampling Period Gear Sampling Periodmentioning

confidence: 98%

“…Funnel-type entrances tend to have higher catch efficiencies than have other types of trap entrances (Vazquez Archdale et al 2006, 2007Bergshoeff et al 2019). Previous experiments on the portunid Charybdis japonica (Asian Paddle Crab) found that funnel-type entrances had higher capture efficacies than did slit entrances because they were easier to enter without the chance of entanglement (Vazquez Archdale et al 2006). In addition, Broadhurst et al (2020) found that small meshed funnel-type entrances had no effect on the escape of BSC.…”

Section: Sampling Period Gear Sampling Periodmentioning

confidence: 98%

“…Additional entry funnels may increase the catch of BSC (Smith and Sumpton 1989), on the basis of observations of antagonistic behaviour around entry funnels hindering the ingress of individuals into the trap. Portunid crabs generally advance towards the bait plume from down current and move around the side of the trap until they locate a funnel (Vazquez Archdale et al 2006). These factors all suggest that a greater number of funnel-type entrances will aid ingress of crabs into the trap, and the decreased chance of antagonistic interaction while entering the trap is likely to particularly benefit smaller crabs.…”

Section: Sampling Period Gear Sampling Periodmentioning

confidence: 99%

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Evaluation of a novel research trap for surveys of blue swimmer crab populations

Hanamseth

Johnson²,

Schilling³

et al. 2022

Mar. Freshw. Res.

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Surveying free-ranging crab populations is important for monitoring the health of exploited stocks and predicting future productivity. Here, we present a novel research trap design for use in fisheries-independent surveys of blue swimmer crab (Portunus armatus) populations, and evaluate the trap against some existing approaches within an independent survey framework. Specifically, the trap design aimed to improve efficiency for capturing smaller crabs, without adversely affecting catches of larger crabs. We quantify and report the abundance and selectivity of these traps, relative to co-located samples obtained using beam trawls and standard commercial round traps, to establish whether these small-mesh traps may offer any improvements over existing survey methods. Comparison and evaluation of these small-mesh traps against other existing survey gear, in different places and at different times, showed that the traps are more effective at catching smaller crabs when they are present, and equally or more effective at catching larger size classes of crabs. The beam trawl appeared to be effective at capturing a reasonable size range of crabs; however, the number of crabs caught (using a similar investment of time) was substantially lower than that caught in traps. This novel small-mesh research trap appears suitable for fisheries-independent surveys of portunid crab species.

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Effect of an escape vent in accordion-shaped traps on the catch and size of Asian paddle crabs Charybdis japonica in an artificial reef area

Zhang

et al. 2016

Chin. J. Ocean. Limnol.

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Comparative fishing trials for invasive swimming crabs Charybdis japonica and Portunus pelagicus using collapsible pots

Cited by 24 publications

References 14 publications

Improving size selectivity of round pot for Charybdis japonica by configuring escape vents in the Yellow Sea, China

Improving size selectivity of round pot for Charybdis japonica by configuring escape vents in the Yellow Sea, China

Evaluation of a novel research trap for surveys of blue swimmer crab populations

Effect of an escape vent in accordion-shaped traps on the catch and size of Asian paddle crabs Charybdis japonica in an artificial reef area

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