The Red Tide

Introduction

Red tide is a dangerous phenomenon, caused by an accumulation of microscopic algae (at least - the simplest, or other microorganisms) in surface waters during their intensive multiplication under the influence of certain factors. Water can purchase (but not necessarily) a reddish color at night is often a bright glow.

It is established that the incidence of "red tide" is directly linked to increasing anthropogenic pollution of coastal waters. "Red tides" cause substantial damage to fisheries and aquaculture (for example, in 1972, losses on them in the Inland Sea of Japan was 7.1 billion yen) as the cause of death of fish and other animals that pose a real danger to human life, using to eat benthic invertebrates, particularly shellfish.

"Red tides" caused great damage to marine ecosystems, as the cause oxygen deficiency in water, the appearance in it of hydrogen sulphide and ammonia and thereby contribute to the emergence zamornyh phenomena.

"Red tides" are observed in many seas, but toxic, accompanied by the loss of life was significantly observed only in the Pacific waters of Kamchatka (in the Bay of St. Paul in 1945 from use in food cooked mussels was poisoning deaths of two crew members of the flotilla, "Aleut" in Avacha Bay in 1973 - a strong poisoning of several residents of Petropavlovsk-Kamchatsky). They are caused by this individual flagellate algae of dinoflagellates that produce the strongest poison nerve - saxitoxin. Poisoning the man he could occur in cases of ingestion of bivalve mollusks (especially mussels), as in the process of filtration in plankton feeding shellfish accumulate in the body of poison contained in microscopic algae.

Natural Phenomenon

Red tide is a natural phenomenon environmental occur because of the prosperity harmless to one or more of plankton or algae plant in the sea or lake, causing discolored water and clear, most of the time the color changes to red, but may range from water color between brown, orange, yellow light, green and pink, where the resulting color depends on the color of phytoplankton, which has caused the phenomenon. But change the color of water is not a sign of the emergence of red tide, as the color change may occur for other reasons such as pollution Alkamiaua not are called organic or color change for reasons other than red tide phytoplankton.

The cause of this phenomenon in a severe poisoning of water in addition to many other hazards; Phenomenon known as red tide to flourish scientifically harmless plankton, as the phenomenon in fact had nothing to tides and color is not always red, and called the name of the red tide phenomena sometimes flourished plankton that are not harmful (Sellner, P. 5-7).

Life cycle

When environmental conditions are not parallel, producing some types of algae, called vesicles Abuga. Spores settle on the bottom may remain at a standstill for months or years waiting for appropriate environmental conditions. When conditions improve and the increasing proportion of nutrients, especially when the temperature and lighting suitable, the spores move to the top and start ...