The bacteria Aeromonas, gram-negative bacteria and its various strains are present in the water at all times and normally cause Ulcer Disease, Septicaemia and Dropsy. There are many types of Aeromonas bacteria such as: - Aeromonas Allosaccharophila; Aeromonas Bestiarum; Aeromonas Caviae; Aeromonas Hydrophila; Aeromonas Ichthiosmia; Aeromonas Jandaei; Aeromonas Media; Aeromonas Salmonicida; Aeromonas Schubertii; Aeromonas Sobria; Aeromonas Trota; and Aeromonas Veronii Sobria; although Aeromonas Hydrophila, and Aeromonas Salmonicida are the most common.
Bacterial infections, caused by Aeromonas are the most common bacterial diseases of fish. This type of bacteria are capable of utilising nutrients that are present in any aquatic environment - allowing them to survive for long periods in the absence of any host fish. They multiply in huge numbers in organically rich waters, such as ponds and other aqua culture systems. Aeromonas are Gram-negative bacteria that are native to most or all aquatic environments as they are found in fresh water, marine water, brackish water, chlorinated and de-chlorinated water's - throughout the world although are considered to be more heavily present in the warmer months of the year. This type of bacteria can also be isolated from the skin and intestinal tracts of healthy fish, or from pond mud and aquatic plants and certain protozoan parasites. The ulcers that are caused often have ragged white margins as a border, or just a hole or crater exposing the flesh. Mortalities associated with this form of disease can rise to high levels within a very short time. The bacteria can multiply inside the intestine causing excessive mucous secretion.
When fish get infected with an Aeromonas, generally something has already affected the host fish by allowing it to be susceptible to a bacterial invasion, normally a parasite attack or an accidental skin damage. Aeromonas Salmonicida generally causes furunculosis - normally found in salmon and trout. Where as the Aeromonas Hydrophila and Aeromonas Sobria cause various forms of diseases but generally in warmer waters. Also stress can cause fish to become more susceptible to bacteria as stress weakens the immune system. Common sources of stress are poor water quality, overcrowding, or rough handling. There is no obvious physical or behavioural signs that are apparent with Aeromonas infections, although an infected host fish often has small haemorrhages at the base of the fins or over the skin in various places; also swollen abdomens and protruding eyes are a sign of a bacterial infection. Internal bacteria infection sometimes offers signs of fluid in the abdomen which then gets swollen, swollen liver and/or spleen, and the intestines or body are swollen with fluid and the scales can be raised - being lifted away from the skin.
Aeromonas Hydrophila has been identified in a wide-range of freshwater fish species throughout the world and occasionally in marine fish as well. However, there are conflicting views over the precise role of Aeromonas Hydrophila. Some researchers argue that the organism is only a secondary invader of a previously weakened hosts, while others argue that Aeromonas Hydrophila is a primary pathogen of freshwater fish whether cold water or tropical water and possibly marine fish of both cold and tropical temperatures. It has been associated with several disease conditions in fish, including tail rot, fin rot, and hemorrhagic septicaemia. Septicaemia is first characterised by a redness just under the skin and this can lead to small surface lesions and later causing the scales lift or peel; plus haemorrhaging in the gills and the anus. But generally and mostly in cold water fish species - ulcers, abscesses, and bulging eyes are the most common characteristic of a Aeromonas infection - together with abdominal swelling, often called dropsy. Plus red-fin disease which is characterised by the presence of surface haemorrhages and scale erosion. Internal infection displays a presence of ascitic fluid in the peritoneal cavity, anaemia, and swelling of the kidney and/or liver. Aeromonas Hydrophila are absorbed from the intestine and induce poisoning whilst capillary haemorrhage occurs in the dermis of fins and body and in the submucosa of the stomach.
2006-07-27 00:51:35
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answer #1
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answered by maidenrocks 3
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It is present in all types of water worldwide as well as food and soil. There are approximately 16 different species in this genus, the best known of which is Aeromonas hydrophila. Physiologically, Aeromonas are similar to bacteria in the coliform group and can be isolated from similar environments.
commonly isolated from a variety of aquatic environments, including freshwater, estuarine, brackish, and salt waters. Aeromonas is a normal part of the microflora found in these waters, and its presence does not indicate the water has been polluted. These organisms have also been isolated from a variety of foods, including red meats (beef, pork, lamb), poultry, produce, fish, and shellfish.
Some members of this group of bacteria have been implicated in human disease, although not all strains appear to be pathogenic to humans. Aeromonas infections are typically acquired through two routes, either through ingestion or through exposure of open wounds. The primary clinical diseases from Aeromonas infections are gastroenteritis and bacterial septicemia. Aeromonas-related gastroenteritis is generally a self-limiting watery diarrhea lasting a few days to a few weeks. In individuals with weakened or impaired immune systems, this diarrhea can be chronic and severe (meaning a significant loss of water from the body.) Aeromonas septicemia (a serious condition where bacteria are present throughout the body) generally occurs from wound infections or from gastroenteritis in individuals with weakened immune systems. Aeromonas infections are treatable with antibiotics.
2006-07-26 01:59:13
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answer #2
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answered by maxie 5
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Aeromonas infections are caused by bacteria which are present in the water all of the time.
see web site - http://edis.ifas.ufl.edu/FA042
2006-07-26 06:43:28
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answer #3
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answered by gordon s 1
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Check the CDC(cdc.gov) website if is not showing up there is always the possibility it may be spelled wrong
2006-07-26 01:58:06
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answer #4
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answered by lilnurse825 1
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Isn't Googles just great. I Googled it and it seems to be a fish disease.
2006-07-26 01:59:15
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answer #5
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answered by Anonymous
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Do you mean "aeromoNas"?
2006-07-26 01:58:30
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answer #6
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answered by Veronica Almighty 2
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Suck my balls.
2016-11-26 01:24:36
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answer #7
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answered by Anonymous
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