Acoustic bubbles?

[Ebden~SPARTA~]

I've been gone the bulk of the summer, working on two different fishery acoustic projects. Most recently myself and another conducted exploratory surveys of several Newfoundland lakes for a larger inter-provincial project next year. Our goal was to get a general sense of boat-launch access to these remote lakes and reservoirs, and to 'feel out' the lakes themselves as appropriate candidates for fisheries acoustics.

 

We generally had a successful trip, with this curve ball in one of the reservoirs. We *think* the bottom contour of the lake in general indicates a previous sub-arctic bog, common in the area (rather than a large lake made larger by a power-dam 50 years ago). Bubbles? Methane gas vent in a bog? What in the world would it be, since we're generally positive it wasn't fish. The skewed echo further below indicates an echo track rising in the water column relatively rapidly.

 

 

[MedicSN6]

Isn't this how the movie "Volcano" began?

 

I do not believe they are fish either. Air bubbles flatten out when rising so, my confirmation would be to take a gas meter and see if anything spikes. You also could have had divers but if there was no boat there, then no divers.

[Ebden~SPARTA~]

Isn't this how the movie "Volcano" began?

 

I do not believe they are fish either. Air bubbles flatten out when rising so, my confirmation would be to take a gas meter and see if anything spikes. You also could have had divers but if there was no boat there, then no divers.

 

 

We did have a boat, but no divers. We do have a camera and an ROV (if boss gives the OK), which we'll deploy next year.

Edited August 30, 2010 by Ebden~SPARTA~

[Yankee~SPARTA~]

Im guessing either bubbles from an underground spring orrrrrr turtle chilling at the bottom blowing bubble rings.

[Halli~SPARTA~]

Fish Farts!