Acoustic Zooplankton Fish Profiler (AZFP)

Acoustic backscatter detects zooplankton migration and fish

An autonomous scientific echosounder with unmatched combination of multiple frequency operation, low power and long endurance that fits your budget.

The ASL Acoustic Zooplankton Fish Profiler (AZFP), offers a new, economical way of obtaining reliable measures of marine environmental conditions in the water column. The AZFP can monitor the presence and abundance of zooplankton and fish within the water column by measuring acoustic backscatter returns at multiple ultrasonic frequencies. Other sonar targets realized from the sonar backscatter data include bubbles and suspended sediments.

A powerful tool for scientific research and environmental monitoring in oceans, lakes and rivers.

Using onboard data storage, the AZFP can collect data continuously for periods of up to one year at high temporal and spatial resolution. The AZFP is available with up to four frequencies in a single transducer housing. It can be operated in bottom-mounted, upward looking mode or in downward looking mode from a buoy, and is ideally suited for taut-line mooring operation, but many other options available. The AZFP has highly configurable sampling programs.

Examples of simultaneous data at up to 4 frequencies from downward looking AZFP (dashed line indicates limiting range to detect S V = - 70dB):


Acoustic Zooplankton
Fish Profiler (AZFP)

Printable Brochure
Venus Project
Technical Papers
AZFP Video

Data Processing Software

Deployment Options

Bottom Mooring
Angled In-line Mooring
Taut Line Mooring
Downward Looking from Buoy
Glider and AUV Mounted
* Example of Glider Application
Over-the-side Deployment
CTD Cage deployment


Up to four frequencies
Upward or downward looking modes
Configurable Ping Rate up to 1 Hz
16 GB Compact Flash, 32 GB Compact Flash optional
0.17m diameter x 1.0m length
50kg (in ruggedized shipping/storage case)

Example AZFP Time Lapse

UAF Ecosystem Observatory

uaf animation

Click on animation to enlarge


Ocean Networks Canada, VENUS observatory Saanich Inlet BC

Hourly backscatter time lapse Hourly time lapse
Monthly backscatter time lapse
Monthly time lapse