Catch composition and codend selectivity of inshore trawl fishery with the legal minimum mesh size

Nguyen, Khanh Q.; Dinh, Minh Q.; Phan, Huyen Trong; Nguyen, Luong Trong; To, Phuong V.; Vu, Nghiep Ke; Tran, Phu Duc

doi:10.1016/j.rsma.2021.101977

Cited by 6 publications

(8 citation statements)

References 37 publications

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“…The government has a low capacity to monitor fish catches and stocks, create policies, and enforce regulation (Pomeroy et al 2009;Tran Thi Phung Ha 2012;Thong Ba Nguyen 2015). Non-compliance with fisheries regulations is routine (Tran Thi Phung Ha 2012;Nguyen et al 2021). We suspect that the reported catch is an underestimate, as data collection is not always commonplace (Thong Ba Nguyen 2015).…”

Section: Vietnammentioning

confidence: 99%

Towards Shrimp and Prawn Welfare in the Wild‐ Caught Fishing Industry: A Global Review and Recommendations for Research and Policy

Ryba,

Connell,

Davis

et al. 2023

Preprint

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Wild-caught shrimp and prawns are the single most numerous group of animals directly killed for human food consumption on the planet. Recent scientific developments have led to greater understanding of the probability that at least some species of shrimp are sentient beings and, should that be the case, policies that could improve shrimp welfare. We begin with an overview of global shrimp fisheries and their characteristics. The world's shrimp fisheries can be understood as a spectrum between large, industrial trawlers in developed and developing countries (e.g. Western Europe, the Americas, Russia) and small-scale fisheries for subsistence in developing countries (e.g. South-East Asia, East Africa). Each has different implications for animal welfare, particularly in light of human wellbeing challenges associated with shrimp fisheries. Secondly, we turn to the emerging science of shrimp welfare and examine recent developments in government and industry policy. In large-scale trawl fisheries, animal welfare can be improved by installing electrical stunning equipment; continuing existing work on bycatch reduction; and optimising on-board processes to reduce the stress endured by shrimp during capture and slaughter. In small-scale fisheries, improving government capacity and supply chain practices may bring benefits for communities in the short-term while opening up opportunities for more specific shrimp welfare policies in the long-term. Thirdly, we provide a new dataset of the estimated numbers of individual shrimp caught by country and species. Drawing on this data, we provide a description of the shrimp fishing industry in the world's top 25 countries by estimated catch of individual shrimp. By our estimates, the wild-catch shrimp industry catches 37.4 trillion individual shrimp (36.3 trillion sergestids, 781 billion carideans, and 287 billion penaeids). Finally, we explore the ethical implications of the probability that shrimp and prawns are capable of feeling pain and the welfare policies that could be adopted.

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Section: Vietnammentioning

confidence: 99%

Towards Shrimp and Prawn Welfare in the Wild‐ Caught Fishing Industry: A Global Review and Recommendations for Research and Policy

Ryba,

Connell,

Davis

et al. 2023

Preprint

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“…Ở nước ta, một số công trình đã nghiên cứu về khả năng chọn lọc của ngư cụ nhằm xác định kích thước mắt lưới phù hợp với kích cỡ của đối tượng đánh bắt ở một số nghề khai thác hải sản như lưới kéo [25,26], lưới chụp [27], lưới rê [6], lưới đáy [7,28], câu mực [22]. Chính phủ đã ban hành quy định kích thước mắt lưới tối thiểu được phép sử dụng để khai thác thủy sản trong đó có nghề lưới rê [1].…”

Section: đặT Vấn đềunclassified

Nghiên cứu sự chọn lọc theo kích thước của lưới rê đơn đánh bắt cá trích xương (Sardinella jussieu) tại vùng biển ven bờ tỉnh Nghệ An

Nguyen¹

2023

JFST

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Nghiên cứu đã sử dụng phương pháp của Holt (1963) để xác định khả năng chọn lọc của lưới rê đơn đánh bắt cá trích xương (Sardinella jussieu) tại vùng biển ven bờ tỉnh Nghệ An. Nghiên cứu đã sử dụng 5 mẫu lưới rê đơn có kích thước mắt lưới 24, 26, 28, 30 và 34 mm để tổ chức 50 mẻ lưới thử nghiệm vào tháng 3 và tháng 4 năm 2022, thu được 2.054 cá thể cá trích xương. Kết quả nghiên cứu cho thấy, chiều dài tối ưu của cá trích xương đánh bắt là 100,5; 108,8; 117,2; 125,6 và 142,3 mm tương ứng với ngư cụ có kích thước mắt lưới 24, 26, 28, 30 và 34 mm; hệ số chọn lọc 4,19; độ lệch chuẩn 19,1; chiều dài cá trích xương tham gia sinh sản lần đầu là 120 mm so với chiều dài tối ưu của cá đánh bắt bởi ngư cụ có kích thước mắt lưới 24, 26, 28, 30 và 34 mm cho thấy, lưới rê có kích cỡ mắt lưới từ 30 mm trở lên là phù hợp để đánh bắt cá trích xương ở vùng biển ven bờ tỉnh Nghệ An.

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“…In addition, we also employed the fleet data in Global Fishing Watch (https://globalfishingwatch.org/data-download/ datasets/public-fishing-effort) to fit the actual fishing effort in the ECS (Table S5), whereas the fishing effort of every month in a year was assumed to be the same in the M2018 no-SFM model. Although a minimum mesh size could be beneficial to the juveniles of nektonic groups by selecting suitable lengths for the species (Heikinheimo et al, 2006;Nguyen et al, 2021), the model cannot load this policy due to the lack of body length distribution data for the kinds of function groups. Climate change was considered to affect the physiology, distribution, and biomass of the marine species and alter the community composition of the marine ecosystems (Cheung et al, 2013;Kroeker et al, 2013;Zeng et al, 2019).…”

Section: Dynamic Simulationmentioning

confidence: 99%

Estimating the Impact of a Seasonal Fishing Moratorium on the East China Sea Ecosystem From 1997 to 2018

Song

Wang

et al. 2022

Front. Mar. Sci.

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Fisheries management policies (FMPs) have been implemented in coastal countries to ensure a sustainable supply of seafood and the recovery of species diversity. Because of the depletion of fishery stocks, China has introduced a series of FMPs since 1995, including a seasonal fishing moratorium (SFM), a zero-growth strategy, and a minimum mesh size for fishing nets. Here, we built two mass balance models for 1997–2000 (M1997) and 2018–2019 (M2018) using Ecopath with Ecosim 6.6 to illustrate the interannual changes over the past two decades in the East China Sea (ECS). We then simulated two dynamic scenarios from 1997 to 2018, SFM (M2018SFM) and no SFM (M2018no-SFM), to test the role of the SFM under fishing pressure in the ECS. Ecopath showed that the ECS ecosystem is becoming more mature, although it is still unstable, featuring lower total primary production/total respiration, longer cycles, faster organic material circulation speed, and a higher omnivorous degree. This suggests a slow recovery for the ECS ecosystem in the past two decades. The biomass of fish in the ECS—especially the planktivores, dominated by small-sized Benthosema pterotum—significantly increased in M2018 versus M1997, but there were fewer medium- and large-sized fish. The keystone species switched from the planktivores/piscivores dominated by Decapterus maruadsi in M1997 to planktivores in M2018. Ecosim illustrated that the SFM has positive effects on fishery resources recovery, especially for commercial fishes (i.e., large yellow croakers and hairtails), as reflected by the significantly higher predicted biomass of fish in M2018SFM compared to M2018no-SFM and M1997, although the bioaccumulation was consumed by the intense fishing pressure after the SFM. However, the M2018SFM prediction for nektons was still lower than the actual value, especially for planktivores, which display a sharp increase in biomass. This should be partly attributable to the policy of the minimum mesh size (<5 cm was banned), which benefits B. pterotum due to its 3.5 cm maximum body size. Therefore, a series of FMPs, rather than only the SFM, functioned together in the ECS ecosystem. However, the mixed trophic impact indicated a negative impact if the fisheries were further developed. Fishery management in the ECS needs to be strengthened by extending the SFM and reducing fishing pressure after the SFM.

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Catch composition and codend selectivity of inshore trawl fishery with the legal minimum mesh size

Cited by 6 publications

References 37 publications

Towards Shrimp and Prawn Welfare in the Wild‐ Caught Fishing Industry: A Global Review and Recommendations for Research and Policy

Towards Shrimp and Prawn Welfare in the Wild‐ Caught Fishing Industry: A Global Review and Recommendations for Research and Policy

Nghiên cứu sự chọn lọc theo kích thước của lưới rê đơn đánh bắt cá trích xương (Sardinella jussieu) tại vùng biển ven bờ tỉnh Nghệ An

Estimating the Impact of a Seasonal Fishing Moratorium on the East China Sea Ecosystem From 1997 to 2018

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