Search the Database
Location | Gear | Catch | Technique | Bycatch Species | Type | |
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Northwest Atlantic |
Non-specific | N/A | Weak links/ropes | Large Cetaceans (maximum length > 7.5 meters) | Summary study | |
Summary: This supplement to a 2002 compendium of NOAA large whale entanglement prevention research provides an overview of recent NMFS gear research and testing of the time tension line cutter. Effect on Bycatch: N/A |
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Northwest Atlantic |
Non-specific | N/A | Weak links/ropes | Large Cetaceans (maximum length > 7.5 meters) | Summary study | |
Summary: This supplement to a 2002 compendium of NOAA large whale entanglement prevention research has newer studies, including investigation of SAM gillnet gear, gillnet weak links and anchoring systems, evaluation of gillnet weak links, and a pilot study of options for reducing vertical line entanglements. Effect on Bycatch: N/A |
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Northwest Atlantic |
Traps | n/a | Quick-release gear, Weak links/ropes | Large Cetaceans (maximum length > 7.5 meters) | Summary study | |
Summary: This supplement to a 2002 compendium of NOAA large whale entanglement prevention research includes newer studies, including evaluation of a time tension line cutter, and studies on neutrally buoyant groundline, load cell field work on gillnets, and recycling of polypropylene rope. Effect on Bycatch: n/a |
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Northwest Atlantiv |
Traps | N/A | Buoy lines with reduced breaking strength, Quick-release gear, Weak links/ropes | Large Cetaceans (maximum length > 7.5 meters) | Summary study | |
Summary: This is a compendium of various studies evaluating potential deterrents to large whale entanglements. Effect on Bycatch: N/A |
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Non-specific | N/A | Passive acoustic deterrents | Large Cetaceans (maximum length > 7.5 meters), Small Cetaceans (maximum length < 7.5 meters) | Summary study | ||
Summary: A summary study of methods used to reduce or eliminate marine mammal entanglements was conducted. The authors found little evidence on the effectiveness of the use of sound to reduce or eliminate marine mammal incidental capture. Substantial decreases in cetacean bycatch, due to the use of passive methods such as increasing fishing net reflectivity, were not evident through comparisons of catch rates in commercial fisheries or from observational deterrence studies. Net alarms have been shown to greatly reduce whale entrapment in Canadian fish traps but similar success has not been shown in reducing small cetacean bycatch in many gillnet fisheries. Few controlled studies on the use of sound to reduce or eliminate marine mammal interactions have been conducted. There is a need to additional basic research on echolocation behavior and behavioral interactions between marine mammals and fisheries. Effect on Bycatch: Net alarms do not appear ver effective in reducing small cetacean entanglements in gillnets |
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Queensland, Australia |
Gillnets | Shark | Acoustic deterrent devices | Megaptera novaeangliae (Humpback whale), Small Cetaceans (maximum length < 7.5 meters) | Field study in the wild | |
Summary: Pingers have been used on shark nets set along Queensland's beaches since 1992. Due to an increase in whale entanglements in 2009, new pingers (Fumunda F3 whale pingers and F10 dolphin pingers) were deployed between July and August 2010. Subsequently updated research on the use of these pingers was needed. For this study, the acoustic characteristics of pingers used on shark nets in Queensland Australia were measured and used to model sound propagation, estimate over what range marine mammals could detect the pingers, monitor ambient noise and to make recommendations on pinger deployment to the Queensland Shark Control Program (QSCP). The results of the sound propagation study indicate that the tones were a few hundred Hz less (2.6-2.8 Hz for F3 and 9.4-9.6 Hz for F10) than indicated. All pingers emitted multiple harmonics and fundamental tones. The power spectrum density levels varied up to 20 dB from angle to angle and pinger to pinger. The 1st harmonic of F3s was audible to all marine mammals over the longest ranges. Only 2 of the 6 tested pingers reached the manufacturer's listed audible range of 1-5 km. During testing, the ranges depended on the individual pinger and angle of the pinger toward the mammal. When animals travel alongside the net, a number of pingers should be set in a series. Based on the current configuration of 3-4 pingers per net of 200 m, humpback whales would hear all of the pingers at any location along the net but dolphins would hear only 1-2 pingers. When animals swim straight at the net, maximum pinger spacing would need to be based on the animals swim speed. The current net/pinger configuration is adequate for humpback whales, dugongs and dolphins swimming at normal travelling speeds. The current pinger spacing is insufficient for dolphins swimming straight at the net at high speeds. Effect on Bycatch: The current net/pinger configuration is adequate for humpback whales, dugongs and dolphins swimming at normal travelling speeds. The current pinger spacing is insufficient for dolphins swimming straight at the net at high speeds. |
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Atlantic and Indian Oceans |
Surrounding nets | N/A | Large Cetaceans (maximum length > 7.5 meters), Small Cetaceans (maximum length < 7.5 meters) | Summary study | ||
Summary: A quantification of interactions between cetaceans and fishers was conducted in the Atlantic and Indian Oceans. A large database of captains logbooks, 1980-2011, was analyzed along with scientific observer observations recorded between 1995 and 2011. The main areas of high co-occurrence between cetaceans and fisheries was shown to exist east of the Seychelles from December to March, the Mozambique Channel between April and May, and in offshore waster of Gabon between April and September. Cetacean associated fishing sets occurred in 3% of sets in both oceans and 0.62% of sets has encircled cetaceans. Survival rates for encircled cetaceans appear to be high. This suggests setting nets close to cetaceans has a low immediate impact to the individual species. Effect on Bycatch: n/a |
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Western Australia |
Traps | N/A | Acoustic deterrent devices | Megaptera novaeangliae (Humpback whale) | Summary study | |
Summary: The authors investigated several data sources and conducted surveys to identify potential mitigation measures that could be used to reduce humpback whale entanglements in Western Australia (WA). The Cetacean Stranding Database (CSD) and Commercial Whale Watching Database (CWWD), managed by the Western Australia Department of Parks and Wildlife, were both investigated. High occurrences of whale entanglements off the central coast of WA were identified in the CSD. Commercial fishing records combined with entanglement records indicated that entangled whales mostly move contrary to movement patterns of the general population. Suggesting the high entanglement rates off the central coast may be reflective of southern and eastern movements of entangled whales during their northward migration. The CWWD database indicated changes in the timing of whale migrations. Updates to logbooks were also made during this study. Paper based logbooks were updated to smart-phone applications. Spatial models indicated that depth ranges of 4-40 ma nd distance from the coast (5-21 m) are useful in predicting the occurrence of humpback whales. An industry lead workshop identified potential whale entanglement mitigation measures, all of which were trialed by fishers after the workshop. All mitigation measures tested, except for remote releases, showed a trade off between price and practicality. Based on these results, rope type, rope length and number of floats used were tested industry wide during trials. This project examined the use of acoustic pingers and found their use made no difference to the behavior of humpback whales. An assessment of their effectiveness was not conducted during this study. Other results from this study indicated, preliminarily, that whales are more likely to become entangled in thinner ropes, and mainlines that are yellow or orange. Effect on Bycatch: Preliminary results suggest pingers made no difference to Humpback whale behavior |
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Worldwide and Iceland |
n/a | Large Cetaceans (maximum length > 7.5 meters), Phocoena phocoena (Harbor porpoise), Demochelys coriacea (Leatherback sea turtle) | Study in the lab | |||
Summary: Documented entanglement cases for sea turtles and cetaceans in mussel aquaculture gear worldwide were collected. Online surveys and semi-structured interviews with mussel operators were used in Iceland. A total of seven entanglement reports were collected, four baleen whales, one harbour porpoise and two leatherback sea turtles. Mussel spat collecting ropes were involved in the majority of cases. Out of the seven reports, two occurred in Iceland. The proximity between cetacean distributions and mussel farming sites is likely a factor in these interactions. In addition, in Icelandic summer spat collection occurs when the largest concentrations of cetaceans are found in its waters. Iceland should consider some sort of mandatory reporting system for these interactions. Effect on Bycatch: n/a |
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New South Wales, Australia |
Traps | n/a | Large Cetaceans (maximum length > 7.5 meters), Small Cetaceans (maximum length < 7.5 meters) | Summary study | ||
Summary: This study collected information on cetacean incidents (carcasses, injured and debilitated animals found onshore, entrapped in shallow water, entangled or floating offshore) that have occurred in New South Wales, Australia. Information on marine mammal incidents was reported to the New South Wales National Parks and Wildlife Service and recorded into a Marine Fauna Events Database. This information was analyzed for trends in mortality and population dynamics such as age and sex ratios. Records existed for the time period of 1790 to 2013. For the majority of incidents, the cause of mortality/morbidity could not be determined. Anthropogenic causes, such as entanglements, accounted for more incidents compared to natural causes such as disease or predation. Entanglement was the largest cause of cetacean incidents that were made up mostly of humpback whale entanglements. Reporting of incidents have increased over time, from 1.3 incidents per year prior to 1960 to 43.5 per year during 2010, 2011, 2012 and 2013. A concentration of incidents were found in the Northern Rivers and North Coast regions. This study highlights the importance of these types of databases. Effect on Bycatch: n/a |