Grenada pelagic longline, troll and dropline Atlantic Ocean yellowfin and bigeye fishery

2021 ◽  
Keyword(s):  
Atlantic Ocean ◽  
Pelagic Longline

scholarly journals Analysis of marine mammal bycatch in the Uruguayan pelagic longline fishery operating in the Southwestern Atlantic Ocean

2015 ◽  
Vol 72 (5) ◽  
pp. 1637-1652 ◽  
Author(s):  
Cecilia Passadore ◽  
Andrés Domingo ◽  
Eduardo R. Secchi
Keyword(s):  
Atlantic Ocean ◽  
Marine Mammals ◽  
Population Decline ◽  
Additive Models ◽  
Longline Fishery ◽  
Southwestern Atlantic ◽  
Southwestern Atlantic Ocean ◽  
Pelagic Longline Fishery ◽  
The Impact ◽  
Pelagic Longline

Abstract Bycatch is one of the main causes of human-caused mortality and population decline of many marine mammals. Monitoring bycatch is the first step to understand the impact of the fisheries on the species affected. Understanding how the interaction between marine mammals and fishing operations varies in space and time, and how it is influenced by environmental variables, is essential for designing mitigation strategies to reduce bycatch mortality. In this paper, we use data gathered by scientific observers and a fishing skipper to analyse marine mammals bycatch by the Uruguayan pelagic longline fishery operating in the Southwestern Atlantic Ocean from 1996 to 2007. The total bycatch per unit effort (Bcpue) was 0.0150 marine mammals/1000 hooks and the highest values (∼0.2) were recorded between 37°–38°S and 49°–51°W. Total cetacean Bcpue during the study period was low (0.0051 cetacean/1000 hooks) and occurred between 32°–37°S and 46°–54°W. Generalized additive models showed that cetaceans' bycatch was mainly affected by the depth, sea surface temperature, and season. Although cetaceans were captured year-round, the highest values were registered in spring months, most bycatch events occurred over the continental slope (median = 619 m) and in waters with a median temperature of 19.7°C. The bycatch of pinnipeds was influenced by depth, location, and season. Pinniped bycatch occurred mainly in winter, in waters ranging from 80 to 5000 m of depth (median = 2366 m) between 34°–37°S (median = 35.9°S) and 54°–49°W (median = 51.8°W). The spatial analysis showed that most bycatch events occurred within the Brazil–Malvinas Confluence zone, an area of high productivity where the pelagic longline fleet concentrates its fishing effort and where marine mammals probably concentrate to feed.

A comparison of circle hook and J hook performance in a western equatorial Atlantic Ocean pelagic longline fishery

2011 ◽  
Vol 107 (1-3) ◽  
pp. 39-45 ◽  
Author(s):  
J.C. Pacheco ◽  
D.W. Kerstetter ◽  
F.H. Hazin ◽  
Humberto Hazin ◽  
R.S.S.L. Segundo ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Longline Fishery ◽  
Equatorial Atlantic ◽  
Equatorial Atlantic Ocean ◽  
Pelagic Longline Fishery ◽  
Pelagic Longline

scholarly journals Horizontal and vertical movements of immature dusky sharks Carcharhinus obscurus in relation to commercial longline fisheries in the western North Atlantic Ocean

2021 ◽  
Vol 9 (1) ◽  
Author(s):  
Andrea M. Kroetz ◽  
Simon J. B. Gulak ◽  
John K. Carlson
Keyword(s):  
North Carolina ◽  
Atlantic Ocean ◽  
North Atlantic ◽  
North Atlantic Ocean ◽  
Fishing Effort ◽  
Depth Range ◽  
Incidental Capture ◽  
Carcharhinus Obscurus ◽  
Longline Fisheries ◽  
Pelagic Longline

Abstract Background Many species of sharks, including the dusky shark Carcharhinus obscurus, are often incidentally captured in commercial pelagic and bottom longline fisheries. Incidental capture can lead to at-vessel or post-release mortality and can be detrimental to populations of threatened, endangered, or prohibited species. The estimated at-vessel mortality for dusky sharks can be high in longline fisheries and, to minimize mortality, time–area closures have been designated in the western North Atlantic Ocean to mitigate interactions with longline fisheries, yet incidental capture of dusky sharks is still common. We compared the vertical and horizontal movements of dusky sharks to the overall fishing effort and depth fished of commercial pelagic and bottom longline fisheries to determine when and where overlap is present that could lead to incidental capture. Results Twenty-one (n = 21) dusky sharks were tagged with pop-up archival transmitting satellite tags and all were immature animals (123–200 cm FL) apart from two individuals (230 and 300 cm FL). Sharks were tagged off the coasts of North Carolina (71%) and Florida (29%). Twenty tags (95%) reported and provided tracks between 1 and 107 days (median 15 days) and 10 tags (50%) remained on sharks for > 4 days. Most individuals remained within the bottom longline closed area off the coast of North Carolina during their time at liberty. Dusky sharks primarily occupied the 20–40 m depth range 26% of the time, and overlapped with bottom and pelagic longline gears 41% and 59% of the time, respectively. Overlap was highest in the winter and spring for both commercial fisheries. Conclusions The use of archival satellite telemetry in this study has provided valuable preliminary information on vertical and horizontal movements of immature dusky sharks in western North Atlantic Ocean. Dusky sharks may be more vulnerable to incidental capture in the pelagic longline fishery due to the high fishing effort, larger areas of horizontal overlap, and greater percentage of vertical overlap. This information will inform mitigation measures of commercial longline fisheries, which can work toward population rebuilding of the species.

scholarly journals Characterization and comparison of Brazilian and foreign leased pelagic longline fleets in the Southwestern Atlantic Ocean between 2003 and 2014. How different are these fisheries?

2016 ◽  
Vol 5 ◽  
pp. 1-16
Author(s):  
Fernando Niemeyer Fiedler ◽  
Gilberto Sales ◽  
Bruno Barros Giffoni ◽  
Luiz Rodrigo Maçaneiro ◽  
Mariana de Karam e Britto ◽  
...  
Keyword(s):  
Atlantic Ocean ◽  
Steel Wire ◽  
Southwestern Atlantic ◽  
Wire Length ◽  
Target Species ◽  
Fishing Strategies ◽  
Southwestern Atlantic Ocean ◽  
Longline Fisheries ◽  
Pelagic Longline ◽  
Engine Power

The pelagic zone of the Southwestern Atlantic Ocean is an important area for longline fisheries. Brazilian waters are strategic regions for the performance of this modality in International Commission for the Conservation of Atlantic Tunas - ICCAT. In order to reach international quotas government strengthened its rent policy of foreign vessels aiming to promote technology transfer to the national fleet. Knowledge of vessel characteristics, technology used in equipment and strategies used by skippers are important for the management of this activity. The present study characterized vessels from national and foreign fleets operating out of the port of Itajaí, in the state of Santa Catarina (SC), between 2003 and 2014. Results indicate that these fleets are different in relation to size of vessels, engine power, cargo hold capacity, length of the main and branchlines, and steel wire length. Despite these differences, strategies adopted are critical to achieve better yields per trip. For the national fleet, the skills acquired to the use of equipments, in understanding the behavior of the target species, and change of fishing strategies often compensate for the lack of technology.

scholarly journals An overview of the hooking mortality of elasmobranchs caught in a swordfish pelagic longline fishery in the Atlantic Ocean

2012 ◽  
Vol 25 (4) ◽  
pp. 311-319 ◽  
Author(s):  
Rui Coelho ◽  
Joana Fernandez-Carvalho ◽  
Pedro G. Lino ◽  
Miguel N. Santos
Keyword(s):  
Atlantic Ocean ◽  
Longline Fishery ◽  
Pelagic Longline Fishery ◽  
Pelagic Longline
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