Predator Behaviour

IT’S BEEN a long standing joke around here that if White River brown trout grew to 20′ long, we would “Need A Bigger Boat”.

Having spent a hell of a lot of 3 decades playing in ther domain, yet only one shadowy glimpse, I’ve always been fascinated by Geat White Sharks.

So when I stumbled across video 12 months ago of the Wood Hole Oceanograpphic Institute remote underwater drone footage of Great White behaviour in Californian waters I checked it out.

Holy moley here was footage, underwater footage, of the sharks predating on the drone, and their behaviour was strikingly similar to how we see White River brown trout moving on our streamers.

Footage from REMUS SharkCam is helping reveal previously unknown details about the strategies that sharks use to hunt and interact with their prey. In what are most likely predatory attacks, sharks take advantage of the clear water to lurk in the darkness below the vehicle, then swim up suddenly and bite it on the tail or mid section— the same way that sharks hunt seals near Guadalupe Island.

“In the clear waters near Guadalupe Island, white sharks lurk in the depths and look for the back-lit silhouette of prey at 100 meters depth. When they spot a target, they swim up quickly and attack the hind fins or flippers in order to disable it before moving in for the kill.” – See more at: http://www.whoi.edu/news-release/remus-sharkcam#sthash.yOR6eSxb.dpuf

It’s particularly interesting that the top predator in their domains have evolved similar predation strategies, though the browns lack the awesome cutting equipment of Great Whites.

Interestingly enough, not every predation on the REMUS was a kill, Great Whites also showed some salmo trutta snootyness,  with curious or territorial bumps, arcing “drivebys” as perhaps an inspection.

Now this may not help you land your trophy this February but if nothing else its food for thought and some pretty entertaining footage.

Below is the original 2013 footage

More background on the SharkCam project