Effects of escape vents on the size selection of whelk (Rapana venosa) and Asian paddle crab (Charybdis japonica) in the small-scale pot fishery of the Yellow Sea, China

Yu, Mengjie; Liu, Changdong; Tang, Yanli; Zhang, Liyou; Zhao, Wei

doi:10.1007/s10750-022-04899-5

Cited by 12 publications

(3 citation statements)

References 49 publications

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“…Large-sized individuals may be attracted to illuminated nets as a means to enhance predation as mentioned above, resulting in smaller-sized individuals avoiding the adjacent area of illuminated nets or even being preyed on by conspecifics or competitors (Humborstad et al, 2018). Meanwhile, the size-dependent swimming ability may provide more opportunities for large-sized species to approach the vicinity of illuminated nets (Yu et al, 2021;Yu et al, 2022). We need further underwater video observation to verify these intraspecific and interspecific interactions.…”

Section: Discussionmentioning

confidence: 99%

“…The profitability of this commercial fishery was reduced substantially (personal communication with fishermen). Meanwhile, extensive fishing activities captured a high proportion of juveniles with low-economic values, which brought negligible incomes for fishermen and was laborconsuming and time-consuming to handle (Sun et al, 2018;Yu et al, 2022). The current exploitation patterns have resulted in the input not being proportional to the output in the trammel net fishery, causing a financial strain on the coastal communities.…”

Section: Introductionmentioning

confidence: 99%

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Application of light-emitting diodes (LEDs) fishing lights to improve catch rates of small-scale trammel net fishery in the Yellow Sea, China

Liu

Zhang

et al. 2022

Front. Mar. Sci.

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The small-scale trammel net fisheries are essential to the economy and well-being of coastal communities in the Yellow Sea, China. However, these fisheries are low efficient and urgently demand technical innovations to improve catch rates. In this study, we conducted field experiments in three traditional fishing grounds (Rizhao, Yantai, and Weihai) to test whether the addition of different colored light-emitting diodes (LEDs) fishing lights in the trammel nets could improve the catch rates of seven commercial species. Results showed that the effects of LEDs on catch rates were species-specific. Green LEDs could significantly increase the catch per unit effort (CPUE) of black rockfish (Sebastes schlegelii), fat greenling (Hexagrammos otakii), marbled flounder (Pseudopleuronectes yokohamae), stone flounder (Platichthys bicoloratus), Asian paddle crab (Charybdis japonica), and mantis shrimp (Oratosquilla oratoria) by 40%-72% compared with unilluminated nets, while had no significant effect on the catch rates of swimming crab (Portunus trituberculatus). Red LEDs harvested 58%-86% higher CPUE of fat greenling, marbled flounder, stone flounder, mantis shrimp, and swimming crab while catching fewer black rockfish and Asian paddle crab. Blue and white LEDs exhibited similar performance, which could significantly capture more black rockfish, fat greenling, and mantis shrimp and did not affect the catch rates of other species. The effects of LEDs were also size-dependent for certain species, and the catch rates generally increased with the length classes. Taking economic benefits into consideration, the green and red LEDs provided the highest profitability for Rizhao, while green LEDs performed best in Weihai and Yantai. This study is the first investigation on how artificial lights affected the catch rates of trammel nets. The findings of our study illustrated that trammel nets equipped with LEDs could serve as a viable fishing strategy in small-scale trammel net fisheries.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Application of light-emitting diodes (LEDs) fishing lights to improve catch rates of small-scale trammel net fishery in the Yellow Sea, China

Liu

Zhang

et al. 2022

Front. Mar. Sci.

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“…The decline in fish stocks can be closely linked to the exploitation pattern of fisheries, especially fishing intensity and the size selectivity and catch efficiency of fishing gear. It is widely acknowledged that extensive use of fishing gear with poor selectivity is one of the primary drivers contributing to the overexploitation of fishery resources [10][11][12][13][14]. As the main fishing gear for harvesting croaker species, before legislation for stow net fisheries, the commonly used stow nets had small mesh sizes (17-20 mm) in the codend, which was considered nonselective [15].…”

Section: Introductionmentioning

confidence: 99%

Effect of Codend Design and Mesh Size on the Size Selectivity and Exploitation Pattern of Three Commercial Fish in Stow Net Fishery of the Yellow Sea, China

Herrmann

Liu

et al. 2023

Sustainability

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To address the issue of minimum mesh size regulations of the stow net fishery for croaker species, we tested and compared the size selectivity and exploitation pattern for diamond- and square-mesh codends with mesh sizes 35, 45 and 55 mm for little yellow croaker (Larimichthys polyactis), silver croaker (Pennahia argentata), and flower croaker (Nibea albiflora) in the Yellow Sea, China. Our results showed that the legal codend (35 mm diamond-mesh) was inadequate to protect the juvenile croaker species because more than 75% of undersized individuals were retained, and the discard ratios were as high as approximately 60%. Irrespective of mesh shape, increasing the codend mesh sizes could significantly improve the size selectivity and exploitation pattern of croaker species. Between codends with the same mesh size, the square-mesh codends had higher size selectivity than diamond-mesh codends. Based on results, the 55 mm square-mesh codend was recommended for rational exploitation of croaker stocks. This study can provide feasibility and insight for the enforcement and reform of management strategies for sustainable fishing in Chinese stow net fisheries.

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Abundance and Distribution of Blue Swimmer Crab in Response to Environmental Variation Across Two Contrasting Estuaries

Hanamseth,

Schilling,

Johnson

et al. 2024

Estuaries and Coasts

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Portunid crabs are an iconic, high value species in NSW, but catches are highly variable in space and time. Substantial variation in biomass is observed in both exploited and unfished populations, and environmental effects on distribution and abundance are an important factor contributing to this variability. Predicting and responding to this variability is a challenge for management and sustainability of exploited populations. We examine spatial and temporal variation in Blue Swimmer Crab (Portunus armatus) populations, over a 2.5 year trapping survey in two temperate estuaries that differ in tidal flow and riverine input. Specifically, monthly catch rates and distribution throughout the estuary are examined alongside variation in temperature and conductivity. In Wallis Lake, the shallower estuary with a restricted entrance, both water temperature and conductivity impacted abundance and distribution of crabs but there was no evidence that pulses of freshwater flow had a major impact. For a 10 °C increase in temperature the population on average shifted ~ 700 m closer to the ocean. Males were consistently located slightly further into the estuary compared to females, but there was no convincing evidence of estuarine egression in response to lower salinity. In Port Stephens, the deeper, tidal estuary, water temperature and conductivity also impacted abundance, but while males were more dispersed than females, the distribution of crabs within the estuary did not appear to be influenced by temperature, conductivity or flow. These results highlight the links between nuanced environmental relationships and estuarine geomorphology for Blue Swimmer Crab.

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Effects of escape vents on the size selection of whelk (Rapana venosa) and Asian paddle crab (Charybdis japonica) in the small-scale pot fishery of the Yellow Sea, China

Cited by 12 publications

References 49 publications

Application of light-emitting diodes (LEDs) fishing lights to improve catch rates of small-scale trammel net fishery in the Yellow Sea, China

Application of light-emitting diodes (LEDs) fishing lights to improve catch rates of small-scale trammel net fishery in the Yellow Sea, China

Effect of Codend Design and Mesh Size on the Size Selectivity and Exploitation Pattern of Three Commercial Fish in Stow Net Fishery of the Yellow Sea, China

Abundance and Distribution of Blue Swimmer Crab in Response to Environmental Variation Across Two Contrasting Estuaries

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