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(61) In order to prevent them from becoming overgrown by algae, a few snails may be added.

(62) There are changes in the number and species of protozoans, algae, and bacteria.

(63) Many gastropods are grazers: they use their radula to rasp away at algae.

(64) Changes in sea temperature or salinity can cause the algae to leave, causing white blotches to form.

(65) Soon the fishless river was clogged with dense mats and braids of algae bloom.

(66) It works along the same lines as an algae magnet where the two magnets attract each other through the aquarium glass.

(67) Since they probably feed on algae, a method of control would be to restrict the growth of algae.

(68) Even in a Koi pool, the Koi will find sufficient algae and other aquatic life to survive without any adverse effects.

(69) She undertook the first serious application of photography to science by making photograms of her extensive collection of algae.

(70) Summer often brings a green coloration caused by dense growths of unicellular green algae stimulated by excess light.

(71) A level of three million algae to a litre of water is fatal to marine life.

(72) Brown algae is generally an indication of quite low lighting levels and increasing the amount of light will overcome this problem.

(73) I wish to eventually add invertebrates to this tank. Green filamentous algae can be a big problem in some tanks.

(74) As a general rule, algae are considered weeds in the aquarium as their growth can not be easily regulated.

(75) It creeps over the boulders on the beds of the mountain streams, grazing on algae.

(76) He is one of 35 local people who is considering suing the authority for loss of business because of the algae.

(77) Nutrients are extremely limited, and the lakes support only thin populations of algae and bacteria.

(78) Often the algae accumulate in a thin layer on the underside of the ice sheet[sentencedict.com/algae.html], dispersing when the ice melts.

(79) The growth of certain species of algae can become quite think if uncontrolled.

(80) White fluorescent light increases the rate of growth of this plant while apparently not encouraging unwanted algae formation.

(81) One week the algae could be clear of toxins and the next week very toxic but no one yet know why.

(82) Some success has been reported in algae control by adding a very dilute copper sulphate or copper citrate solution to the water.

(83) More light is refracted below the surface, and algae, especially diatoms. rapidly become plentiful.

(84) If the algae faltered, the brilliant Shepelev would follow; or, if he succumbed, the algae would do likewise.

(85) Toxic algae has previously been confined to lowland shallow lakes surrounded either by an increasing population or intensively farmed land.

(86) There was algae and seaweed growing on the top layer of bamboos, which was certainly not there before.

(87) There have also been unconfirmed reports of algae blooms coincident with the dolphin deaths.

(88) The algae feeds on nitrogen and phosphates which come into the water from agriculture and sewage.

(89) Other marine life expected to suffer included coral reefs, algae and sea grass.

(90) The algae consumed waste products from the reef and under the intense artificial sunlight they proliferated in stringy green mats.