02.08.2020

what is a drumline for sharks

The Western Australian Government is conducting a scientific trial of non-lethal SMART drumlines. She said authorities should be looking at a “patchwork strategy” involving multiple types of approaches at the same time. Edited 10 February 2020.
“I think there is a pretty high level of community concern over the ethics of catching animals and the potential harm that can be done to them,” she said.  “Some of the animals caught on the drumlines will die. On the North Coast, 23 sharks were caught, including a 3.5-metre tiger shark at Lennox Head. These included land or air-based human observation, tagging and satellite monitoring, electronic deterrents such as Shark Shields, visual deterrents like wetsuits using camouflage or warning designs, and installing artificial kelp forests as sharks do not like being in such forests. In Reunion, fishermen usually attend the drum lines within 90 minutes of an alert and 90 per cent of animals caught on the hooks survive. Traditional drumlines were more targeted, but often resulted in the deaths of animals including non-target animals.  The new SMART drumline system aimed to alert authorities when an animal had been caught, allowing them to release it alive. Some of the animals caught on the drumlines will die. These included land or air-based human observation, tagging and satellite monitoring, electronic deterrents such as Shark Shields, visual deterrents like wetsuits using camouflage or warning designs, and installing artificial kelp forests as sharks do not like being in such forests. “There’s not one strategy that will work all the time in all the places, that’s important to note,” she said.“But there’s lots of different strategies proving to be very successful in different places.”If we approach the challenge in a patchwork way, I think that’s much more effective rather than looking for one silver bullet solution. In her findings that were published in the journal Marine Policy, she found “the effectiveness of lethal approaches to reduce risk of shark bite is not supported by consistent, convincing evidence”. Anchored to the sea floor, SMART drumlines comprise of two buoys and a satellite-linked GPS communications unit attached to a baited hook.A triggering magnet is attached to the communications unit and the line. Picture: Juan Oliphant via AP . Traditional drumlines were more targeted, but often resulted in the deaths of animals including non-target animals. “I think there is a pretty high level of community concern over the ethics of catching animals and the potential harm that can be done to them,” she said.  “Some of the animals caught on the drumlines will die. “Some of the animals caught on the drumlines will die. Releasing the animals alive was a contrast to a program she studied in Western Australia a few years ago, and the existing program in Queensland, where the target animals were shot. Scientific non-lethal SMART drumline trial. There … But Dr Gibbs said there were a number of concerns over the use of such technology.“I think there is a pretty high level of community concern over the ethics of catching animals and the potential harm that can be done to them,” she said. Sixteen sharks were caught on the South Coast, and 14 on Sydney’s northern beaches. Once a shark is caught, it is tagged and released back to sea … DBCA has restrictions on the use of drones within the Ngari Capes Marine Park, which encompasses the trial area. It could be one of the largest great whites ever recorded. Exclusion barriers could be suitable for some places, but not where there was large surf.

“Their effectiveness is really highly debated,” she said.  She said authorities should be looking at a “patchwork strategy” involving multiple types of approaches at the same time.  “There’s not one strategy that will work all the time in all the places, that’s important to note,” she said.

Also, a very new approach was suspending a blimp above a beach to look for sharks – a project currently being developed in Kiama by a UOW PhD student. One line is attached to an anchor on the sea floor, while the other features a large baited shark hook. Tags that use satellites to determine a shark’s position cannot reliably provide the level of accuracy required for fine-scale tracking as transmission of position is limited to when the shark’s dorsal fin breaks the surface. Exclusion barriers could be suitable for some places, but not where there was large surf.

The new SMART drumline system aimed to alert authorities when an animal had been caught, allowing them to release it alive. When a shark takes the bait and puts pressure on the line, the magnet is released alerting the boat crew and DPI scientists that there is an animal on the line. A triggering magnet is attached to … And the SMART drumlines will still catch animals that pose no threat to people.” Dr Gibbs said so far the DPI appeared to be fairly successful with their aim of releasing target animals of white, tiger and bull sharks 1km from the shore after they had been caught. Through the Department of Primary Industries and Regional Development (DPIRD), the scientific trial commenced on 21 February … A SMART drumline is designed to be non-lethal and to send an alert when a shark has been captured on the line. Traditional drumlines were more targeted, but often resulted in the deaths of animals including non-target animals. Data stored in the on board memory of the receiver is retrieved at a later date and information downloaded will be provided to the Chief Scientist for independent assessment.In addition, acoustically tagged sharks can also be detected by one of the satellite-linked receivers which make up the Shark Monitoring Network.The Shark Monitoring Network will provide ocean users and land managers with near real-time alerts of tagged white sharks and large tiger sharks.
The shark net trial announcement came just two days after Mr Baird's backflip on banning greyhounds.. A drum line consists of a large baited hook suspended from a large plastic float, which in turn is anchored to the sea bed… Posted on September 25th, 2019. SMART (Shark-Management-Alert-in-Real-Time) drumlines are a new technology. SMART (Shark-Management-Alert-in-Real-Time) drumlines are a new technology.

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