A day of Cannon Netting
Jun. 9th, 2006 02:34 pmThese photos are now almost a year old, but I figured I might finally get off my butt and post some. These were taking during a North-West Wader Study Group expedition cannon net carried out from Broome Bird Observatory - where I worked as an Assistant Warden last year. Except for three photos taken by my mum (who was visiting for a week), these were all taken by a guy named Rob Gegg, who attended the netting session and has a much better camera than my own.
The net is set on the beach early in the morning and/or during low tide. It's set on whatever is deemed the best beach for a catch by the team leaders. Today that beach was Two Dog Hermit on the northern shore of Roebuck Bay near Broome. A varied flock, consisting of mainly Godwits and Knots was spotted there in the previous days, and flocks tend to frequent the same beaches on the same tide cycle.
Before high tide, the team quietly makes their way to the hide (in the case it was in the rock formations at the base of the pindan cliffs). The team leaders usually place themselves in a closer hide with the detonator for the cannons and communicate with the main team via walkie talkies. Sometimes others are dispatched to "twinkle" the flocks. Twinkling involves slowly approaching a flock to make it move slightly - hopefully into the catching area. Only those with a lot of experience are allowed to determine when the best time is to fire the net. The flock should be a decent size to make it worth the effort, but not so large that it will take ages to process the birds - the longer they are in captivity, the more stressed they get. The birds must also be in the precise area, if they are straying to where the net edges will go, then you can't fire without risking the lives of many birds. The Australian Wader Study Group, which runs these expeditions has a record of a less than 0.2 percent deaths per netting, I think you're allowed 1% or something (could be lower), if you're consistently killing more birds than that you lose your licence, this in an exercise in banding and release, not retrieving dead specimens. The edges of the net can behead a bird and the weights at the corners of the net are hefty iron bars which move at speed once they're fired. Any fatalities are retrieved, examined and preserved for further research, so nothing goes to waste as such.
Anyway, on to the photos!
( Lots of big pictures )
The net is set on the beach early in the morning and/or during low tide. It's set on whatever is deemed the best beach for a catch by the team leaders. Today that beach was Two Dog Hermit on the northern shore of Roebuck Bay near Broome. A varied flock, consisting of mainly Godwits and Knots was spotted there in the previous days, and flocks tend to frequent the same beaches on the same tide cycle.
Before high tide, the team quietly makes their way to the hide (in the case it was in the rock formations at the base of the pindan cliffs). The team leaders usually place themselves in a closer hide with the detonator for the cannons and communicate with the main team via walkie talkies. Sometimes others are dispatched to "twinkle" the flocks. Twinkling involves slowly approaching a flock to make it move slightly - hopefully into the catching area. Only those with a lot of experience are allowed to determine when the best time is to fire the net. The flock should be a decent size to make it worth the effort, but not so large that it will take ages to process the birds - the longer they are in captivity, the more stressed they get. The birds must also be in the precise area, if they are straying to where the net edges will go, then you can't fire without risking the lives of many birds. The Australian Wader Study Group, which runs these expeditions has a record of a less than 0.2 percent deaths per netting, I think you're allowed 1% or something (could be lower), if you're consistently killing more birds than that you lose your licence, this in an exercise in banding and release, not retrieving dead specimens. The edges of the net can behead a bird and the weights at the corners of the net are hefty iron bars which move at speed once they're fired. Any fatalities are retrieved, examined and preserved for further research, so nothing goes to waste as such.
Anyway, on to the photos!
( Lots of big pictures )

