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Jérôme OLLIER

#coronavirus - Reduction of Low-Frequency Vessel Noise in Monterey Bay National Marine ... - 0 views

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    Low-frequency sound from large vessels is a major, global source of ocean noise that can interfere with acoustic communication for a variety of marine animals. Changes in vessel activity provide opportunities to quantify relationships between vessel traffic levels and soundscape conditions in biologically important habitats. Using continuous deep-sea (890 m) recordings acquired ∼20 km (closest point of approach) from offshore shipping lanes, we observed reduction of low-frequency noise within Monterey Bay National Marine Sanctuary (California, United States) associated with changes in vessel traffic during the onset of the COVID-19 pandemic. Acoustic modeling shows that the recording site receives low-frequency vessel noise primarily from the regional shipping lanes rather than via the Sound Fixing and Ranging (SOFAR) channel. Monthly geometric means and percentiles of spectrum levels in the one-third octave band centered at 63 Hz during 2020 were compared with those from the same months of 2018-2019. Spectrum levels were persistently and significantly lower during February through July 2020, although a partial rebound in ambient noise levels was indicated by July. Mean spectrum levels during 2020 were more than 1 dB re 1 μPa2 Hz-1 below those of a previous year during 4 months. The lowest spectrum levels, in June 2020, were as much as 1.9 (mean) and 2.4 (25% exceedance level) dB re 1 μPa2 Hz-1 below levels of previous years. Spectrum levels during 2020 were significantly correlated with large-vessel total gross tonnage derived from economic data, summed across all California ports (r = 0.81, p < 0.05; adjusted r2 = 0.58). They were more highly correlated with regional presence of large vessels, quantified from Automatic Identification System (AIS) vessel tracking data weighted according to vessel speed and modeled acoustic transmission loss (r = 0.92, p < 0.01; adjusted r2 = 0.81). Within the 3-year study period, February-June 2020 exhibited persistentl
Jérôme OLLIER

Porpoises after dark: Seasonal and diel patterns in Pacific harbour porpoise (Phocoena ... - 0 views

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    Pacific Harbour Porpoise (Phocoena phocoena vomerina) occupy a large range throughout coastal waters of British Columbia. Despite their wide distribution, they remain largely data-deficient regarding abundance and population trends, and as such are listed as Special Concern under the Species At Risk Act. Harbour porpoises are also particularly sensitive to disturbance, especially vessel-related acoustic disturbance. Large aggregations of harbour porpoise have been documented in waters around the entrance to the Port of Prince Rupert during the winter months, however little is known about the annual fine-scale activity of this species in this highly trafficked area. In this multi-year study, we used a combination of land-based visual surveys and passive acoustic monitoring (PAM) devices (C-PODs and F-PODs) to address data gaps regarding density, diel patterns, and seasonality of harbour porpoise around Prince Rupert. Echolocation activity was detected during 96% of the 1086 C-POD deployment days and 100% of the 727 F-POD deployment days, with 86% of visual surveys recording harbour porpoise presence. We detected strong seasonal and diel trends in activity, with echolocation peaks between April and June and during the hours of darkness throughout the year. There was a notable increase in daytime activity of harbour porpoise between January and March, which coincides with the months of large aggregation observations. This study indicates that despite the constant presence of large vessels, harbour porpoise continue to persist within waters surrounding Prince Rupert. This suggests the area is an important habitat for this species and also may indicate some extent of acclimatization to localized disturbance.
Jérôme OLLIER

Vessel Strikes of Large Whales in the Eastern Tropical Pacific: A Case Study of Regiona... - 0 views

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    Vessel strike is recognized as a major modern threat to the recovery of large whale populations globally, but the issue is notoriously difficult to assess. Vessel strikes by large ships frequently go unnoticed, and those involving smaller vessels are rarely reported. Interpreting global patterns of vessel strikes is further hindered by underlying reporting biases caused by differences in countries' research efforts, legislation, reporting structures and enforcement. This leaves global strike data "patchy" and typically scarce outside of developed countries, where resources are more limited. To explore this we investigated vessel strikes with large whales in the Eastern Tropical Pacific (ETP), a coastal region of ten developing countries where heavy shipping and high cetacean densities overlap. Although this is characteristic of vessel strike "hotspots" worldwide, only 11 ETP strike reports from just four countries (∼2% of total reports) existed in the International Whaling Commission's Global Ship Strike Database (2010). This contrasts greatly with abundant reports from the neighboring state of California (United States), and the greater United States/Canadian west coast, making it a compelling case study for investigating underreporting. By reviewing online media databases and articles, peer review publications and requesting information from government agencies, scientists, and tourism companies, we compiled a regional ETP vessel strike database. We found over three times as many strike reports (n = 40), from twice as many countries (n = 8), identifying the geographic extent and severity of the threat, although likely still underestimating the true number of strikes. Reports were found from 1905 until 2017, showing that strikes are a regional, historic, and present threat to large whales. The humpback whale (Megaptera novaeangliae) was the most commonly hit species, and whale-watch industries involving small vessels in areas of high whale densities were recogniz
Jérôme OLLIER

China's First Large Yellow Croaker 'Smart Aquaculture Ship' Earns ASC Certification - @... - 0 views

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    China-based fish-farming ship Conson No. 1 has become the first large yellow croaker (Larimichthys croceus) farm to achieve the Aquaculture Stewardship Council (ASC) certification in December 2022. It is the world's first full-scale "smart farming ship" which can produce 3,700 tonnes of large yellow croaker annually. Local high-end retail company Ole has begun discussions to promote and source ASC certified large yellow croaker for consumers in China.
Jérôme OLLIER

Vessel Strike of Whales in Australia: The Challenges of Analysis of Historical Incident... - 0 views

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    Death or injury to whales from vessel strike is one of the primary threats to whale populations worldwide. However, quantifying the rate of occurrence of these collisions is difficult because many incidents are not detected (particularly from large vessels) and therefore go unreported. Furthermore, varying reporting biases occur related to species identification, spatial coverage of reports and type of vessels involved. The International Whaling Commission (IWC) has compiled a database of the worldwide occurrence of vessel strikes to cetaceans, within which Australia constitutes ~7% (35 reports) of the reported worldwide (~471 reports) vessel strike records involving large whales. Worldwide records consist largely of modern reports within the last two decades and historical evaluation of ship strike reports has mainly focused on the Northern Hemisphere. To address this we conducted a search of historical national and international print media archive databases to discover reports of vessel strikes globally, although with a focus on Australian waters. A significant number of previously unrecorded reports of vessel strikes were found for both Australia (76) and worldwide (140), resulting in a revised estimate of ~15% of global vessel strikes occurring in Australian waters. This detailed collation and analysis of vessel strike data in an Australian context has contributed to our knowledge of the worldwide occurrence of vessel strikes and challenges the notion that vessel strikes were historically rare in Australia relative to the rest of the world. The work highlights the need to examine historical records to provide context around current anthropogenic threats to marine fauna and demonstrates the importance of formalized reporting structures for effective collation of vessel strike reports. This paper examines the issues and biases in analysis of vessel strike data in general that would apply to any jurisdiction. Using the Australian data as an example we look at what
Jérôme OLLIER

Migrants : 6 055 personnes secourues lundi au large de la Libye - @AFP via @orangenewsfr - 0 views

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    Migrants : 6 055 personnes secourues lundi au large de la Libye.
Jérôme OLLIER

Very Large Ore Carrier Spills Fuel Off Singapore - @Mar_Ex - 0 views

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    On Tuesday morning, the very large ore carrier Berge Bureya spilled approximately one ton of heavy fuel oil into the Straits of Malacca off of Tanjung Piai, Malaysia, just west of Singapore.
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    On Tuesday morning, the very large ore carrier Berge Bureya spilled approximately one ton of heavy fuel oil into the Straits of Malacca off of Tanjung Piai, Malaysia, just west of Singapore.
Jérôme OLLIER

Active Whale Avoidance by Large Ships: Components and Constraints of a Complementary Ap... - 0 views

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    The recurrence of lethal ship-whale collisions ('ship strikes') has prompted management entities across the globe to seek effective ways for reducing collision risk. Here we describe 'active whale avoidance' defined as a mariner making operational decisions to reduce the chance of a collision with a sighted whale. We generated a conceptual model of active whale avoidance and, as a proof of concept, apply data to the model based on observations of humpback whales surfacing in the proximity of large cruise ships, and simulations run in a full-mission bridge simulator and commonly used pilotage software. Application of the model demonstrated that (1) the opportunities for detecting a surfacing whale are often limited and temporary, (2) the cumulative probability of detecting one of the available 'cues' of whale's presence (and direction of travel) decreases with increased ship-to-whale distances, and (3) following detection time delays occur related to avoidance operations. These delays were attributed to the mariner evaluating competing risks (e.g., risk of whale collision vs. risk to human life, the ship, or other aspects of the marine environment), deciding upon an appropriate avoidance action, and achieving a new operational state by the ship once a maneuver is commanded. We thus identify several options for enhancing whale avoidance including training Lookouts to focus search efforts on a 'Cone of Concern,' defined here as the area forward of the ship where whales are at risk of collision based on the whale and ship's transit/swimming speed and direction of travel. Standardizing protocols for rapid communication of relevant sighting information among bridge team members can also increase avoidance by sharing information on the whale that is of sufficient quality to be actionable. We also found that, for marine pilots in Alaska, a slight change in course tends to be preferable to slowing the ship in response to a single sighted whale, owing, in part, to the substan
Jérôme OLLIER

Allianz: "Shipping losses remain at historic lows, but Covid, mega-ship, supply chain a... - 0 views

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    - Safety & Shipping Review 2021: 49 large ships lost worldwide last year. Total losses down 50% over 10 years. Number of shipping incidents (2,703) declines year-on-year. - Shipping industry resilient through pandemic, but crew change crisis has long-term consequences. Covid-19 delays and surge in demand for shipping increasing cost of claims. Inadequate ship maintenance could bring future claims. - Suez Canal incident shows ever-increasing vessel sizes continue to pose a disproportionately large risk with costly groundings and salvage operations. High number of fires and containers lost at sea. - South China, Indochina, Indonesia and Philippines maritime region is the global loss hotspot.
Jérôme OLLIER

Large vessels blamed for slowest shipping growth since 2009 - @ContainerMag - 0 views

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    Large vessels blamed for slowest shipping growth since 2009.
xiaobaicai

large diameter drainage pipe,pvc Cold Water Supply Pipe-TongDa Plastic - 0 views

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    We specialize in manufacturing of large diameter drainage pipe and pvc Cold Water Supply Pipe.if you are looking buy products,welcome to contact us.
Jérôme OLLIER

Unusually large swarm of icebergs drifts into shipping lanes - @AP via @physorg_com - 0 views

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    Unusually large swarm of icebergs drifts into shipping lanes.
Jérôme OLLIER

Via @OCEANUSLive - Foreign-flagged vessel seized with large cargo of weapons off Crete ... - 0 views

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    Greek authorities have seized a foreign-flagged vessel and arrested all of its crew members after a raid revealed it was carrying a large cargo of weapons and explosives.
Jérôme OLLIER

Un cargo transportant 60.000 tonnes de charbon coule au large de Bombay - AFP - 0 views

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    Un cargo transportant 60.000 tonnes de charbon coule au large de Bombay.
Jérôme OLLIER

Détroit : 11 migrants secourus au large de Calais, 7 réussissent à traverser ... - 0 views

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    Détroit : 11 migrants secourus au large de Calais, 7 réussissent à traverser.
Jérôme OLLIER

Près de 6500 migrants secourus au large de la Libye, arrivées massives attend... - 0 views

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    Quelque 6500 migrants ont été secourus au large des côtes libyennes le 29 août, soit l'une des journées les plus chargées de ces dernières années dans cette partie de la Méditerranée. De nouvelles arrivées massives sont attendues ce mardi.
Jérôme OLLIER

Via @HUMAN_SEA - Large 'Tesla ships' all-electric container barges are launching this a... - 0 views

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    Large 'Tesla ships' all-electric container barges are launching this autumn.
Jérôme OLLIER

La Chine a localisé l'épave du pétrolier iranien naufragé au large de ses côt... - 0 views

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    La Chine a localisé l'épave du pétrolier iranien naufragé au large de ses côtes.
Jérôme OLLIER

Transport maritime - Piraterie au large du golfe de Guinée : le Nigéria reste... - 0 views

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    Transport maritime - Piraterie au large du golfe de Guinée : le Nigéria reste la cible principale.
Jérôme OLLIER

Lessons From Placing an Observer on Commercial Cargo Ships Off the U.S. West Coast: Uti... - 0 views

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    Ship strikes of whales are a growing concern around the world and especially along the U.S. West Coast, home to some of busiest ports in the world and where ship strikes on a number of species including blue, fin, and humpback whales have been documented. This trial program examined the feasibility, logistics, industry cooperation, and effectiveness of placing an observer on board a commercial ship. An experienced marine mammal observer went on five voyages, spanning over 8 days on ships operating between U.S. West Coast ports. Daylight observations were conducted over 68 h and covered over 1300 nm as ships transited between three ports [Seattle, Oakland, and LA/Long Beach (LA/LB)]. Sightings of large whales were reported on all (n = 42), totaling an estimated 57 individuals that included humpback, blue, fin, and beaked whales. Close encounters of large whales occurred (on one occasion a near miss, estimated at 40 m, of two humpbacks), and on another, a ship chose to alter course to avoid whale sightings in its path identified by the observer. All ships personnel cooperated and voluntarily aided in the observations even after initial skepticism by some crew about the program. While most effort on mitigating ship strikes along the U.S. West Coast has focused on shipping lanes, the vast majority of these sightings occurred outside these lanes and on the transit routes, emphasizing the need for added attention to these areas. This experiment demonstrates the effectiveness and promise of observations from ships providing critical information on whale locations at risk to ship strikes.
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