Depredation: An old conflict with the sea DOI
J. Marcus Drymon,

Amanda E. Jargowsky,

Evan Gerald Prasky

et al.

Fish and Fisheries, Journal Year: 2024, Volume and Issue: 25(5), P. 806 - 810

Published: May 25, 2024

Abstract Depredation (the partial or complete removal of a hooked species by non‐target species) is human–wildlife conflict as old humans and the sea. In some ways, depredation no different today than it was century ago. But in many this has become more complicated. Following three decades successful management, US shark populations have begun to rebuild. However, anglers attribute perceived increases management measures, claiming they led ‘overpopulation’ sharks and/or learned behaviour sharks. We investigated whether these factors could explain reported depredation. Based on fishery‐independent surveys, neither population nor evident. angler effort provide an alternative explanation that not often considered. While far from smoking gun, at least four themes emerge thought exercise. First, important understand historical predator baselines. Second, acknowledge lifting baselines, is, instances where previously depleted are recovering. Third, remember there when stakeholder observations were initially misaligned with traditional scientific but ultimately recognized pivotal for filling data gaps. Finally, perhaps most important, acknowledgement potent real conflict. Arguably, may matter if increased decreased; overwhelming perception stakeholders increase depredation, (or real) must be addressed.

Language: Английский

Individual-based modelling to fine-tune management measures for commercial demersal sharks DOI Creative Commons
Carlo Zampieri, Carlotta Mazzoldi, Saša Raicevich

et al.

Ecological Informatics, Journal Year: 2025, Volume and Issue: unknown, P. 103147 - 103147

Published: April 1, 2025

Language: Английский

Citations

0
Codeveloping on deck conservation technology with tropical tuna purse seine fishers to mitigate elasmobranch bycatch DOI Creative Commons
Jefferson Murua,

Maitane Grande,

Gala Moreno

et al.

ICES Journal of Marine Science, Journal Year: 2025, Volume and Issue: 82(5)

Published: May 1, 2025

Abstract Current efforts to mitigate impacts on threatened elasmobranch species in tuna fisheries focus primarily best handling and release practices for individuals caught the gear or arriving deck. Releasing elasmobranchs fast is key as prolonged ventilatory restriction results reduced survival. Yet, because large sharks mobulid rays can be very demanding dangerous crew, times significantly delayed. To address these challenges, we developed improved a series of novel bycatch devices (BRDs) such ramps, stretchers, shark velcros, hoppers, lower deck gutters, sorting grids, straps close collaboration with Spanish tropical purse seiner fishers. Our BRDs minimize contact between fishers increased crew safety time acceleration improve postrelease survival thus resulting win–win formula. Long-term cooperation fleet our scientific group has been fine-tuning BRD performance, more importantly, generating trust promoting readiness their voluntary uptake. Increasing sustainable fishing requirements by markets have also favoured adoption willingness. Several Regional Fisheries Management Organizations begun endorsing new BRDs, potentially leading greater implementation across seine fleets globally. The success case study offers insights researchers managers seeking achieve effective conservation outcomes through fisher involvement.

Language: Английский

Citations

0
Discovery of a potential open ocean nursery for the endangered shortfin mako shark in a global fishing hotspot DOI Creative Commons
Gonzalo Mucientes, Alexandre Alonso‐Fernández, Marisa Vedor

et al.

Scientific Reports, Journal Year: 2025, Volume and Issue: 15(1)

Published: Jan. 16, 2025

Populations of large pelagic sharks are declining worldwide due to overfishing. Determining the overlap between shark populations and fishing activities is important inform conservation measures. However, for many threatened whereabouts particularly vulnerable life-history stages - such as pregnant females juveniles poorly known. Here, we investigated spatial distribution size classes, energy transfer reproductive states endangered shortfin mako, Isurus oxyrinchus, using spatially resolved catch data from a Spanish surface longline vessel (1996 2009) in South-east Pacific Ocean. Our results suggest general eastward gradient occurrence thousands kilometers western oceanic feeding grounds towards eastern Pacific, where observed an aggregation area small juveniles. Moreover, potential nursery likely overlapped hotspot, increasing vulnerability fisheries. that limiting pressure this could reduce mortality early life contribute species.

Language: Английский

Citations

0
Recent Occurrence of the Critically Endangered Smalltooth Sawfish Pristis pectinata in Tamaulipas, Mexico DOI
María Teresa Carreón‐Zapiain

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(1)

Published: Jan. 1, 2025

ABSTRACT Currently, all the extant batoids species from family Pristidae are listed as critically endangered and their populations decreasing. Multiple efforts have been made in Mexico to record presence of Pristis pectinata pristis . This is first a living P. specimen since 2016 most recent for state Tamaulipas 1970. Interinstitutional multidisciplinary attempts increase research conservation sawfishes critical habitats must be reinforced.

Language: Английский

Citations

0
Advancing Management of the Main Predatory Sharks Along the Argentine Coast: Leveraging Habitat Use Knowledge and Historical Catch Data DOI Open Access
Agustín M. De Wysiecki, Noela Sánchez‐Carnero, Andrés C. Milessi

et al.

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(2)

Published: Feb. 1, 2025

ABSTRACT This study investigates the spatial overlap in habitat use among four key predatory species—school shark ( Galeorhinus galeus ), broadnose sevengill Notorynchus cepedianus copper Carcharhinus brachyurus ) and sand tiger Carcharias taurus )—along Argentine coast to identify important areas for joint management. Leveraging suitability predictions these predators, we generated annual seasonal maps significant regions of overlap. Notably, coastal zone between Uruguayan northern coasts emerged as crucial developing fishery management conservation strategies species. Historical catch data also identified zones recreational fishing potential nursery sites, stressing need targeted area Punta Rasa Mar del Plata (36.3°–38° S). highlights necessity comprehensive regulations with stronger enforcement unregulated provincial waters Chubut Santa Cruz, well coast. Our findings underscore importance integrating species‐specific ecological designing marine protected tailored unique life history movement patterns sharks. Additionally, emphasizes adaptive, multijurisdictional accommodate migratory nature species across national waters. The implications are discussed within context current chondrichthyan policy Argentina, presenting a foundational basis informing future aimed at sustaining populations Southwest Atlantic.

Language: Английский

Citations

0
Migratory patterns and seasonal habitat use of great hammerhead sharks (Sphyrna mokarran) in the southeastern United States DOI
Grace A. Casselberry, Gregory B. Skomal, Lucas P. Griffin

et al.

Journal of Fish Biology, Journal Year: 2025, Volume and Issue: unknown

Published: April 3, 2025

The great hammerhead shark (Sphyrna mokarran) is a highly mobile species whose population in the United States declined dramatically through early 2000s. Their spatial ecology poorly understood, creating challenges for effective conservation of this enigmatic marine predator. Using acoustic telemetry and network analyses, we describe movement patterns 15 mature sharks (207-331.5 cm fork length) primarily within waters southeastern from April 2019 to December 2022, including identifying corridors, core use areas seasonal shifts habitat use. Great hammerheads exhibited partial migration; some undertook consistent, repeatable, round-trip migrations between tagging site Florida Keys northern points Gulf Mexico Atlantic coast. Conversely, others remained year-round. Network analysis coupled with community detection algorithms revealed that individual displayed oceanic basin affinity, favouring migration either Ocean or Mexico. shifted their seasonally inshore channels (spring summer) offshore artificial reefs natural reef tract (summer winter). These may be driven by prey availability, as often corresponded known locations spawning aggregations fish. data fill an important knowledge gap migratory can improve management strategies historically overexploited species. We discuss importance drawing upon multiple management, particularly designation essential fish habitat.

Language: Английский

Citations

0
Safeguarding the Great White: Fisher Engagement as a Cornerstone for Elasmobranch Conservation in the Mediterranean DOI
Martina Arpaia, Massimiliano Bottaro, Sara Bonanomi

et al.

Aquatic Conservation Marine and Freshwater Ecosystems, Journal Year: 2025, Volume and Issue: 35(5)

Published: April 29, 2025

ABSTRACT The Mediterranean Sea, a biodiversity hotspot classified by the IUCN as critically threatened for sharks and rays, faces significant conservation challenges because of geopolitical complexities. Traditional, top‐down management strategies often fail, thus calling alternative approaches. This study documents first recorded catch release juvenile great white shark ( Carcharodon carcharias ) off Lampedusa Island (Central‐Southern Sea), facilitated EU‐cofunded LIFE ELIFE project. successful release, achieved through collaboration between scientists local fishers, underscores importance stakeholder involvement cooperative in conserving endangered elasmobranchs Mediterranean.

Language: Английский

Citations

0
A wandering wedgefish illustrates the need for cooperative elasmobranch conservation in the Arabian Gulf DOI Creative Commons
Stephan Bruns, Shamsa Al Hameli, Erik Sulanke

et al.

Environmental Biology of Fishes, Journal Year: 2024, Volume and Issue: 107(3), P. 307 - 318

Published: March 1, 2024

Abstract The smoothnose wedgefish Rhynchobatus laevis , a shark-like ray classified as Critically Endangered by the International Union for Conservation of Nature, has received limited research attention. To address knowledge gaps in its spatial behaviour, this study utilised satellite monitoring fortuitously captured female over 51-day period Arabian Gulf. Based on resulting movement track, individual covered minimum distance 712 km, traversing exclusive economic zones three different countries. Its track began United Arab Emirates, from where it headed north, entering Iranian waters, spent most time, before continuing westward across Gulf and eventually reaching Qatari waters. Novel insights into behaviour revealed an observation rapid ascents period. Although both diurnal nocturnal were observed, they occurred predominantly during periods. Contrary to prevailing belief that are bottom-associated, animal considerable amount time water column. use various depths nearshore offshore waters highlights elevated susceptibility multiple types fishing gear. This underscores need international cooperative approach management conservation rays

Language: Английский

Citations

2
DNA metabarcoding of cloacal swabs provides insight into diets of highly migratory sharks in the Mid‐Atlantic Bight DOI
Jill A. Olin, Hidetoshi Urakawa, Michael Frisk

et al.

Journal of Fish Biology, Journal Year: 2023, Volume and Issue: 103(6), P. 1409 - 1418

Published: Aug. 29, 2023

The abundances of migratory shark species observed throughout the Mid-Atlantic Bight (MAB) during productive summer months suggest that this region provides critical habitat and prey resources to these taxa. However, principal assemblages sustaining biomass in are poorly defined. We applied high-throughput DNA metabarcoding feces derived from cloacal swabs across nine Carcharhinid Lamnid sharks (1) quantify contribution broad taxa (e.g., invertebrates, fishes) supporting seasonal residency MAB (2) determine whether displayed distinct dietary preference indicative resource partitioning. resulted high taxonomic (species-level) resolution diets with actinopterygian elasmobranch fishes as dominant categories species. identified several key groups consistent likely integral for their region, including Atlantic menhaden (Brevoortia tyrannus), mackerel (Scomber scombrus), benthic elasmobranchs, skates. Our results previously published stomach content data similar size range Northwest Ocean, efficacy swab a minimally invasive diet reconstruction technique. reliance on could imply wasp-waist food-web conditions months, whereby forage sustain diverse suite within complex, food web.

Language: Английский

Citations

5
Multiple interannual records of young-of-the-year identify an important area for the protection of the shortfin mako, Isurus oxyrinchus DOI
Carlo Cattano, Chiara Gambardella,

Desiree Grancagnolo

et al.

Marine Environmental Research, Journal Year: 2023, Volume and Issue: 192, P. 106217 - 106217

Published: Oct. 14, 2023

Language: Английский

Citations

4