Once a whale was sighted the boat would attempt to approach the whale.
At a distance of 50 m, if the whale was travelling, the boat would slow and turn to match the speed and direction of the whale.
If the whale was circling and displaying high turning rates typical of feeding whales, the boat was positioned on the outer side of the circle to ensure that the whale's behaviour remained undisturbed.
Whenever possible photo-identification images were taken of the individuals being followed. Once photos had been taken, the boat was moved to within 100 m of the whale.
To minimise the possibility that some surfacings in a sequence would be missed, the boat was kept within 100 mof the whale and travelled at the same speed and in the same direction as the surfacing whale.
Effort was also made to locate the ‘ footprint’ of the terminal dive in a surfacing sequence.
The boat was then manoeuvred on to the footprint and a GPS location taken.
During a focal follow the following data were gathered: number of individuals, behaviour, time of first surfacing, time of each subsequent blow and time of final blow measured to the nearest second, whether or not the whale ‘fluked up’ before a deep dive and GPS location of foot print.
Once a whale was sighted the boat would attempt to approach the whale.
At a distance of 50 m, if the whale was travelling, the boat would slow and turn to match the speed and direction of the whale.
If the whale was circling and displaying high turning rates typical of feeding whales, the boat was positioned on the outer side of the circle to ensure that the whale's behaviour remained undisturbed.
Whenever possible photo-identification images were taken of the individuals being followed. Once photos had been taken, the boat was moved to within 100 m of the whale.
To minimise the possibility that some surfacings in a sequence would be missed, the boat was kept within 100 mof the whale and travelled at the same speed and in the same direction as the surfacing whale.
Effort was also made to locate the ‘ footprint’ of the terminal dive in a surfacing sequence.
The boat was then manoeuvred on to the footprint and a GPS location taken.
During a focal follow the following data were gathered: number of individuals, behaviour, time of first surfacing, time of each subsequent blow and time of final blow measured to the nearest second, whether or not the whale ‘fluked up’ before a deep dive and GPS location of foot print.
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