Algae in Water Supplies: An Illustrated Manual on the Identification, Significance, and Control of Algae in Water Supplies. Page: 63
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ALGAE IN WATER SUPPLIES
Finland, Australia, and South Africa (28). The outbreaks
have occurred only during the summer months when algae
are abundant. The symptoms associated with poisoning by
the blue-green algae are generally prostration and convulsions
followed by death.Figure 47.-Nodularia spumigena,
the first blue-green alga
reported as toxic.A few aquatic algae are known to infect the gills of fish,
causing a disease which interferes with respiration and is
often fatal (29). The dinoflagellate Oodin-ium ocellatum
parasitizes small fresh-water fishes. Other species of this
genus occur in the marine tunicates, annelid worms, and
other aquatic invertebrates (30).
Fish kills in fresh-water lakes and reservoirs have often
been blamed, with considerable justification, on the algae.
When there is a heavy algal growth, a reduction in the
amount of sunlight due to weather conditions will reduce
the photosynthetic activity of the algae. With insufficient
byproduct oxygen being produced the algae are forced to
use in respiration the oxygen stored in the water. If this
condition should exist for any length of time, the water
would lose most of its oxygen causing the algae and in addition
the fish to die of oxygen starvation.
On the other hand, normal amounts of sunshine on a very
thick mat of algae can bring about a fish kill. If the mat
becomes thick enough to prevent the passage of light to
planktonic algae below the surface, the latter will then use
up more oxygen than is produced and oxygen depletion
takes place which, in turn affects the fish.
A balance tends to exist between the amount of algae, the
sunlight, and the total oxygen requirements of the fish and
other aquatic organisms. A rise in water temperature might
easily be the factor which stimulates an excessive growth of
algae and thereby sets off the chain of events leading up to
oxygen starvation and a fish kill (31).
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Palmer, Charles Mervin, 1900-. Algae in Water Supplies: An Illustrated Manual on the Identification, Significance, and Control of Algae in Water Supplies., book, 1959; Cincinnati, Ohio. (https://digital.library.unt.edu/ark:/67531/metadc9129/m1/63/: accessed April 25, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.