IMAGE GALLERIES: Fisheries Management Inspection Search & Evidence Recovery Hull & Berth Sweeps Surveillance
Leak & Flow Detection Bottom Typing Vehicle Vision Deploying DIDSON Data Presentation Sonar 101

FISHERIES MANAGEMENT

Enumeration: DIDSON™ 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. On the Data Presentation page, you can learn about the new Clustergram software to aid in counting fish.

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.

A 6 MINUTE VIDEO ABOUT DIDSON IN FISHERIES IS POSTED ON YouTube.

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 Deploying DIDSON to see an extensive collection of examples from our users.

Fisheries Flyer: Click here to see a brochure highlighting DIDSON use for fisheries.
Information Page: Check the Information Page for many papers, articles and web links regarding fisheries applications.

Portraits of Fish and Aquatic Life

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.)

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	Bottom Contour & Fish Height	Giant Grouper	Shark & Shadow	Manatee Hovering	Manatee Family	Manatee Swims
Alligator	Turtle	Salmon at 60m	Paddlefish	Gar	Neversink Eel	If you have any different examples you'd like to share, let us know and we'll arrange data transfer. Should they be added to the website, you will be credited.

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The Natural Environment: Behavioral Observations

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.)

Salmon & 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	Herring	Sea Lion & Herring
Bass Eating	Swimming in Circles

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Interacting with Manmade Environments: Behavioral Observations

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.)

Fish Hatchery Pond	Salmon in Gill Net	Shallow Water Fish	Trash Rack	Dam Shot	Predation Screen	Casting a Net
Sturgeon	Common Carp	Salmon in Locks	Popnet	Mystery Schools	Bony Bream	Shad Repulsion
Hooked Halibut	Hooked Skate	Bever Eel	Cormorant	Scared Eel	Sea Lion	Gill Net

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Large Lens Set Examples

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.)

Large Lens: Varied Size Fish

Large Lens: 2 Kings 2 Sockeyes

Large Lens: 61m Example

Large Lens: Entire Kenai River