The opening efficiency difference of guide net in finless porpoise escape device by the type of extension net in stow net

LEE, Gun-Ho; KIM, Hyun-Young; SONG, Dae-Ho

doi:10.3796/ksfot.2021.57.4.271

Cited by 6 publications

(1 citation statement)

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“…It is also a necessary initiative for the conservation of the common dolphin to extensively apply such mitigation measures to commercial fishing gear and vessels that operate within their home ranges. For example, in Korea, the use of excluder devices developed to prevent the bycatch of finless porpoises has been legally recommended to fishermen using stow nets in the YS [47]. However, in countries where fishery development is considered vital for food security or maintaining the balance of trade, cetacean bycatch action plans may be considered low-priority or politically unacceptable [48].…”

Section: Discussionmentioning

confidence: 99%

A First Study on Distribution Characteristics of Common Dolphin in Korean Waters: A Study Using Data Collected during the Past 20 Years

Yoo,

Park,

Lee

et al. 2023

JMSE

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The common dolphin (Delphinus delphis) is the second-most bycaught species in Korean waters. To provide key information about their habitat boundaries and hotspots for spatial conservation and management, the spatial use of this species was examined using data obtained from sighting and bycatch surveys of cetaceans in the past 20 years. The 95% minimum convex polygon and 95% density contour of fixed-kernel analysis suggested that the boundary of the home range of common dolphins is limited to the coastal region (Busan–Sokcho) of the East Sea/Sea of Japan. From 50% density contours drawn by kernel density estimation, it was suggested that their hotspots are around the coast of Ulsan–Pohang, Doghae, and Sokcho within the home range. Common dolphins were not observed in the Yellow Sea. Hence, shallow waters in the geographic area of the coastal region of the Yellow Sea are likely not a suitable habitat for common dolphins in this region.

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Section: Discussionmentioning

confidence: 99%

A First Study on Distribution Characteristics of Common Dolphin in Korean Waters: A Study Using Data Collected during the Past 20 Years

Yoo,

Park,

Lee

et al. 2023

JMSE

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Characteristics of catch losses in stow nets with finless porpoise excluder devices and a strategy to reduce them

Lee

Song

Kim

2022

Regional Studies in Marine Science

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A Study on the Catch Losses and Mesh Selectivity Related to the Attachment of Marine Mammal Bycatch Reduction Devices on Midwater Trawl Gear

Jung,

Park,

Choi

2024

Fishes

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The National Institute of Fisheries Science in Korea is developing marine mammal bycatch reduction devices (BRDs) for high-risk fishing gear, such as trawls. We experimented with two BRD types (guiding nets) attached in front of codend at 30° and 45° angles, and catch losses and mesh size selectivity were investigated. Experimental fishing operations were conducted along the East Coast of South Korea where whales and dolphins are commonly sighted. The catch was classified according to fishing location, BRD type, codend, and covernet, with measurements recorded for body length, maximum girth, and weight. The average selectivity for each haul was analyzed using the ‘selfisher’ package. The catch loss rates with the BRD attached at tilt angles of 30° and 45° were 11% and 29% for common flying squid, 6% and 28% for sailfin sandfish, and 5% and 8% for pearlside. While the mesh selectivity rates for common flying squid and pearlside remained at 0.2–0.5 across all lengths and tilt angles, the mesh selectivity curve for sailfin sandfish was estimated. There were significant differences in catch loss between 30° and 45° angles, with the 30° angle being more effective in catch loss. We observed a masking effect in the codend.

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The opening efficiency difference of guide net in finless porpoise escape device by the type of extension net in stow net

Cited by 6 publications

References 0 publications

A First Study on Distribution Characteristics of Common Dolphin in Korean Waters: A Study Using Data Collected during the Past 20 Years

A First Study on Distribution Characteristics of Common Dolphin in Korean Waters: A Study Using Data Collected during the Past 20 Years

Characteristics of catch losses in stow nets with finless porpoise excluder devices and a strategy to reduce them

A Study on the Catch Losses and Mesh Selectivity Related to the Attachment of Marine Mammal Bycatch Reduction Devices on Midwater Trawl Gear

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