Enumeration: DIDSONTM works in rivers and streams with rocky, uneven beds where other acoustic measurement products have been ineffective. DIDSON is generally placed in the water near the bank and looks perpendicular to the flow. Fish are imaged and optionally counted and sized as they pass through the sonar's field of view. When it is important to determine the number of fish around a particular structure, DIDSON can replace sampling nets by periodically counting the number of fish in a specific volume.
Fish Behavior: The near video quality of the image allows observation of fish behavior in turbid water and at night near natural and manmade structures such as turbine intakes, fish screens, and the mouth of trawl nets.

DIDSON-BASED FISH ASSESSMENT WORKSHOP - October 27 and 28, 2008 - ANCHORAGE, ALASKA: Complete information on workshop and registration.

THIS PAGE IS DIVIDED INTO SEVERAL CATEGORIES: Examples of Aquatic Life, Behavioral Studies in both Natural and Manmade Environments and Extended Range Views. SCROLL DOWN TO SEE THE CATEGORIES.

FOR INFO ON MOUNTING A DIDSON go to the Deploying DIDSON page to see an extensive collection of examples from our users.

AFS San Francisco Meeting Abstracts List: Click here to see a document with all the abstracts listed.
Fisheries Flyer: Click here to see a flyer highlighting DIDSON use for fisheries.
Information Page: Check the Information Page for many papers, articles and web links regarding fisheries applications.

MOVIES: Click on each image to see the complete movie.
(Depending on your connection method, movies take a few seconds to download and begin to show the movement.)

EXAMPLE PORTRAITS OF FISH AND AQUATIC LIFE

Rockfish	Fraser Sturgeon	Jellyfish	Shark	Sand Shark	Lamprey
Perch - 5 meters	Perch - 3 meters	Baracuda	Three Big Fish	Murray Cod	Asian Carp
Atlantic Sturgeon	Mobile River Fish	Stingray	Kenai Salmon	Giant Grouper	Shark & Shadow
Manatee Hovering	Manatee Family	Manatee Swims	Alligator	If you have any different examples please let us know, and we'll arrange data transfer.

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THE NATURAL ENVIRONMENT: BEHAVIORAL OBSERVATIONS

Salmon and Rocks	Salmon Digs Redd	Good Spawn	Group Spawn	Male Bite Chase	Mangrove
Salmon Collision	Predator Avoidance	Large & Small Fish	Alewife School	Chinook Milling	Big Anchovy School
Schooling in a Line	Shore Interface	River Habitat	Trout Traveling	Anchovy School	Follow the Leader
Crab Crawling NEW!	Herring NEW!	Herring & Sea Lion NEW!	If you have any different examplesplease let us know, and we'll arrange data transfer.

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INTERACTING WITH MANMADE ENVIRONMENTS : BEHAVIORAL OBSERVATIONS

Fish Hatchery Pond	Salmon in Gill Net	Fish in Shallow Water	Trash Rack	Dam Shot	Predation Screen
Casting a Net	Sturgeon	Common Carp	Ballard Locks	Popnet	Mystery Schools
Bony Bream	Shad Repulsion	Hooked Halibut	Hooked Skate	Bever Eel	Cormorant
Scared Eel NEW!	If you have any different examples we'd love to see them. Please let us know, and we'll arrange data transfer.

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LONG RANGE AND LARGE LENS SET EXAMPLES

Salmon at 60m

Large Lens:2 Kings 2 Sockeyes NEW!

Large Lens:61m Example NEW!

Large Lens: Entire Kenai NEW!

Large Lens:Varied Size Fish NEW!

If you have any different examples we'd love to see them. Please let us know, and we'll arrange data transfer.