Aquascience - Lake, River and Wetland Specialists Floating reedbeds and floating islands
Fish refuge structures and fishery services
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graphic showing reedbeds on water
Algal Control and Urban Lake Restoration
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Every year, lake and pond owners in the UK spend hundreds of millions of pounds trying to suppress algae and maintain clear water. Algal blooms turn garden ponds opaque, make some fisheries virtually un-fishable and cause oxygen depletion in others, and impoverish the aquatic ecosystem in wildlife ponds and park lakes. The problems are particularly acute for local authorities and water companies, because of the potential risks to public health from blue-green algae and the high cost of removing algal biomass, blue-green algal toxins and taste/odour compounds of algal origin from the water supply.
photo of algal bloom on lake water lilies
photo of microscopic biotomes
The maintenance of good water quality is governed by a few simple principles - simple, that is, to understand, but often very difficult to apply:
Bullet Point reducing the availability of nutrients, particularly phosphate, by controlling inputs and inhibiting nutrient recycling from the sediment layer;
Bullet Point encouraging the establishment of aquatic plants (macrophytes) to compete directly with algae for light and nutrients and provide a habitat for algal-grazing invertebrates
Bullet Point sustaining high populations of Daphnia and other filter-feeding invertebrates by creating new habitats, and taking steps to reduce fish predation.
Lake owners can be seduced by the promise of a quick fix to their algal problems in the form of algicides, phosphate-stripping chemicals or flocculants, but the benefits tend to be short-term; natural algal control mechanisms are often suppressed, and susceptible algae can be replaced by recalcitrant types that readily bloom between treatments.

Aquascience has a proven track record in devising and installing long-lasting, sustainable algal control strategies based on the simple principles above. Prior to implementing a remediation plan, a macroinvertebrate survey is recommended as a benchmark to measure future improvements in water quality and flag up deficiencies in the natural algal control mechanisms. Algal analysis, carried out in our Chesterfield laboratory, helps to build an understanding of the seasonal changes in the algal profile, whilst shedding light on the underlying water quality problems.

reeds canal
reedbeds on a reservoir
Bioremediation strategies include:
Bullet Point The modification of existing banks to permit marginal planting
Bullet Point Other bioremediation measures such as coir fibre rolls and willow spiling
Bullet Point The use of barley straw to create new habitat for Daphnia and other filter-feeders
Bullet Point The creation of fish-free zones as invertebrate refuges
Bullet Point The use of floating reedbeds to attenuate nutrient inputs and filter out algal biomass
Bullet Point The management of fish stocks.
Telephone: 0044 (0) 1243 555999 Fax: 0044 (0) 1243 555273 Email:
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