Fish Passage FAQ's

  • See our questions and answers about the "Salmon Cannon" - Whooshh Fish Passage FAQ.pdf
  • How does the underlying system work? The systems are based upon patented technology which causes a motive force to be introduced. When a localized pressure differential is introduced, between the front and back of the fish in the Whooshh tube, it moves.   

  • Can live fish be transported?   Yes, happily!    They are not in a column of water, rather they are in air for few seconds, depending on the length of the Whooshh transport tube.     

  • What is the size range of the fish that can be transported?  We have a range of Whooshh tubes to accommodate a variety of sizes.  We have transported fish from <1 kg to >15 kg.
  •  Is there any scale loss or damage to eyes?  With an average pressure of 1-2 PSI experienced by the fish, our tests and experience suggest there is little to no scale loss and no evidence of damage to their eyes.
  • How high can a Whooshh system transport fish?  How high do you want to go?   Because we do not have to move a column of water, we have no theoretical limit. There may be practical limits, but if we have not encountered such project yet.
  • How long?  Please see the Specifications.  
  • How do you get fish in the tube?  The fish can be hand fed or be part of a volitional entry system
  • How fast do fish move through the system?  A typical system will move fish between 5 and 10 meters per second. 
  • How many fish can be transported per minute?  Our standard configuration provides for consistent transport up to 40 fish per minute. Higher volumes are achievable depending on specific system configruations.
  • Do you need to slow fish down at the end of the system?   If the fish is exiting into open waters, we may not need a deceleration system. If exiting to a confined area, depending upon the configuration, we have a variety of deceleration designs that can be deployed.
  •  Are there temperature operating limits?  The materials used to construct our tubes are rated from minus 60 to 300 degrees Fahrenheit. Because water is not used in the tube, except as a lubricant, the tube does not freeze and need not be drained. We do mist the tubes, which also cools the air in the tube.
  • What happens if a fish gets stuck?  We would never want to see that happen. The systems are designed to have a restriction at the entrance so a fish too big can’t enter the tube in the first place.
  • Can the tube go in the water?  Our tubes can float. Depending upon application, a protective barrier may be required.
  • How much water is used for transport?  Our standard system uses water for lubrication only.  Auxiliary misters can be added if required. A standard mister uses 9 gallons of water per hour. 
  • How robust is the system?  Each system has just three moving parts – that’s it.
  • How much power does a system use?   Depending upon the quantity, height, and length of transport, our systems generally use between 5-25 kw each.