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Fish Passes & Easements

 

Fish Passes and Easements

We have the technical know-how and resident expertise to design new fish easement channels and assess weir removal to improve fish passage. Two of the three directors have a long career in understanding fish passage issues and resolutions.

We have the technical know-how and resident expertise to design new fish easement channels and assess weir removal to improve fish passage. Two of the three directors have a long career history in fisheries. Both Jon Milliken and Mark Stollery are able to bring to our company many years of understanding fish passage issues and resolutions.

Aquascience have the know-how and resident technical expertise to evaluate these obstructions and under the Salmon and Freshwater Fisheries Act advise clients on the options available. We have the ability to gather data from water courses, for a range of scenarios. Here flow data is being gathered to assess the conveyance of water supply into one of the fish farms on a local catchment.

Impoundments are often viewed a significant obstructions to fish passage. Removal of these structures is one solution to the problem. This image has been taken part way through our removal of an impoundment on the Itchen Canal.

The Water Framework Directive has been implemented to restore natural features to bring back failing waters, to one of `favourable` condition.  Aquascience were contracted by the local Authority in Andover to carry out an Environment Agency funded project to re-define the bed profiles on the river Anton.

Avoiding the exhaustive application processes for a technical fish pass, fish easements are now becoming the preferred option for the mitigation of obstructions in many rivers.

This fish easement was designed and implemented by Aquascience. Here we used significantly reduced manufactured ground protection materials and no concrete.

A more cost effective option to the technical pass, a close to nature easement can be easily constructed and typically offers a channel which is passable by all or at least more fish species. The successful design was to incorporate a large number of our own 3 litre potted marginal plants to prevent erosion of the banks.

 


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