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FISH PASSAGE ASSESSMENT
FISH PASSAGE ASSESSMENT

ATET-TECH is an environmental consulting company which is focused on assessing whether fish monitoring is actually required at a facility to meet regulatory requirements and if required, monitor, evaluate and develop fish passage technologies used either alone or combined as integrated systems. This also includes installation of specific technologies for fish management applications as well as assessing their performance. Technologies have included fine mesh screens, coarse screens, louvers, barrier nets, fish pumps and fish return systems, and behaviour systems such as light and sound. 

 

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  Research  
  Knowledge  
  Aquatic Environment  
  LGD
 
  our experience

Extensive research has been conducted on various fish protection systems in an attempt to reduce the entrainment and impingement of fishes at hydroelectric facilities as well as at once-through-cooling thermal power plants. Many of these systems involve elaborate screening apparatus that are expensive and not always effective.There are possibly more cost-effective options which includes integrated systems such as lights and coarse physical barriers.

  services

Our technology a new underwater LED device (Light Guidance Device, LGD, ATET-Tech Inc.) that use red, green and blue LED light modules capable of producing different color combinations flashing at frequencies of 1 – 40 times per second to address species specific responses of fish and other aquatic organisms. Various spectral/frequency combinations produced by the LGD have been demonstrated effective at either attracting or repelling juveniles of a wide variety of fish species. LGD technology can either be used alone or integrated with another system.

  technologies

ATET-Tech’s integrated system can include a bar rack or louver design complemented with a unique light based system for improving performance of said louver or bar rack system. The addition of specific wavelengths for a fish behavioural response will allow an increased spacing and greater array angle to shore, thereby resulting in less material, lower construction costs and less issue with biofouling organisms.

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Other technologies can also be integrated with the LGD including coarse angled screens, barrier nets, fish pumps and fish return systems. Integrated fish protection systems are flexible, can be low cost, and have recently shown promise for further research and development. Integrated systems are necessary given the well-documented species-specific responses to different stimuli, the plasticity of diel patterning and circadian rhythms in fish in response to changing light cues, and the influence of various environmental parameters such as temperature and turbidity on the performance of fish protection systems.