Health Library en Environmental Gill Disorders in Fish  
Gills are special organs which allow fishes to breathe underwater. However, if a fish's environment is not well maintained, it can develop gill disorders. Of these, the three main disorders are gas bubble disease, carbon dioxide toxicity, and hydrogen sulfide toxicity.
1. Gas bubble disease usually occurs in cold water systems. When the water in the tank, aquarium or fishpond has an abnormal amount of dissolved gases (i.e., nitrogen, argon, carbon dioxide), fishes can develop gas bubble disease. This occurs when the water more]]> Respiratory Mon, 28 Jul 2008 18:18:02 +0000 311 at
Gas Bubble Disease in Fish  
 Gas bubble disease refers to the development of gases in a fish's bloodstream. This can occur when its aquarium or pond water is supersaturated with gases.
Symptoms and Types
Gas bubble disease damages the fish's tissue, causing tiny gas bubbles to form in the gills, fins, and eyes of the animal. This tissue damage, if extensive, can even lead to the fish's death.
Fishes are cold-blooded creatures, meaning their body temperature depends on the temperature of their environment. The water they live in and t more]]> Cardiovascular Mon, 28 Jul 2008 18:23:42 +0000 312 at
Kidney And Urinary Tract Disorders in Fish  
There are few major kidney and urinary tract disorders seen in fishes. Of these the main kidney and urinary tract disorders are Renal Dropsy, Carp-dropsy complex, and Proliferative kidney disease (PKD).
1. Renal dropsy in fishes is caused by the parasite, Sphaerospora auratus. Renal dropsy usually occurs in pond-raised goldfish. There is damage to the kidneys and swelling of the abdomen due to fluid accumulation is the most common sign of renal dropsy. There is no treatment for this kidney disorder and it usually causes death of the infected fis more]]> Urinary Wed, 02 Jul 2008 15:07:17 +0000 134 at
Anemia in Fish Anemia is a heart and blood vessel condition which is recognized by the low number of red blood cells found in the animal. It can affect many types of fishes, so be observant of your pet and take your animal to the veterinarian if anemia is suspected.
Symptoms and Types
The most common symptom -- which is also quite visible -- is abnormally pale gills in your fish.
Fishes can have anemia due to many reasons; among them:

Bacterial, fungal, viral and parasitic infections
Folic acid deficiency (especially prev more]]> Cardiovascular Fri, 18 Jul 2008 20:52:45 +0000 269 at
Bone And Muscle Disorders in Fish  
Much like other animals, fishes can have bone and muscle disorders.
Symptoms and Types 
One such bone and muscle disorder is Broken Back Disease, which is typically due to a vitamin C deficiency. This disease will literally bend the fish's backbone. However, injuries are sometimes the cause of an abnormal backbone.
Another typical bone and muscle disorder is caused by the parasite Pleistophora hyphessobryconis. This parasite attacks the skeletal muscle – responsible for movement – of freshwater aquariu more]]> Musculoskeletal Wed, 02 Jul 2008 14:52:21 +0000 129 at
Carp Pox in Fish Carp Pox is a viral disease which is caused by the herpesvirus infection. It is one of the oldest diseases seen in fish. As the disease weakens the fish with infection and lesions, it leaves the fish susceptible to secondary infections by other microorganisms. The fish also become disfigured by the disease.
This disease usually affects carp and koi, but can also infect other types of fishes, and is therefore also named fish pox.
Symptoms and Types
Initially, the Carp pox shows up as milky skin lesions, which are smooth and raised in appearance. These lesions more]]> Skin Wed, 02 Jul 2008 15:16:19 +0000 137 at
Common Eye Disorders in Fish  
Eye disorders in fishes can be due to disease, infections, or injury.
Symptoms and Types 
These disorders can cause the eye(s) of the affected fish to display any of the following symptoms:

Enlargement (giving an appearance of a popping eye)
Blood in the eye
Parasites within the eye
Abnormality around the eye

A fish’s eye is usually examined with a penlight or a flashli more]]> Eyes Wed, 02 Jul 2008 15:02:25 +0000 132 at
Nutritional Disorders in Fish  
Many fishes suffer from nutritional disorders because of a poor diet. Nutritional disorders are the most common reason for sickness and death in aquarium, tank or fishpond fishes.
Reasons and Prevention 
1. Nutritional imbalance in commercial food: Fishes can be either plant eaters (herbivores), meat eaters (carnivores), or both (omnivores). And although commercial food is available for fishes, a nutritional disorder can still occur because each species of fish has a different nutritional requirement, which is not always fulfilled by the commercial more]]> Digestive Wed, 02 Jul 2008 15:10:43 +0000 135 at
Parasitic Digestive Disorders in Fish  
Most digestive disorders in fishes are caused by parasite infections. However, not all parasites cause problems for fishes -- some live in a symbiotic relationship with the fishes.
Symptoms and Types
The symptoms can vary depending on the parasite causing the digestive disorders, but usually include weight loss, lethargy and loss of appetite. Young fishes are especially susceptible to digestive disorders and can die before any symptoms arise. Such parasites which cause these type digestive disorders include:

Protozoan paras more]]> Digestive Wed, 02 Jul 2008 14:58:14 +0000 131 at
Skin Parasites in Fish  
There are many types of parasites that can infect a fish's skin. Two such microscopic parasites are Dactylogyrus and Gyrodactylus. These are tiny flatworms, which infect goldfish, koi and other types of fish.
Symptoms and Types
Fishes infected with these parasites will display sores and ulcers on the skin and gills, have a pale skin color, and be covered with small hemorrhages. Dactylogyrus and Gyrodactylus infections should be diagnosed and treated quickly because they can become fatal for your fish.
[ pagebreak ]Treatment more]]> Skin Wed, 02 Jul 2008 15:05:19 +0000 133 at
Tumors And Cancers in Fish  
Fishes develop tumors and cancers, much like humans and other animals. However, sharks are a type of fish which never develops cancers.
Symptoms and Types 
Most tumors are seen as bumps or lumps under the fish's skin. But the location and signs of the tumor can be different for each fish, and depend greatly on the type of tumor. Unfortunately, internal tumors or cancers display symptoms once it has become to late to save the fish. Also, the fish’s ability to eat and swim will be affected, causing a rapid decline in its health.
&nb more]]> Cancer Wed, 02 Jul 2008 14:55:53 +0000 130 at
Viral Infection (Lymphocystis) in Fish  
Lymphocystis disease is a common viral infection which affects the skin and fins of saltwater and freshwater fish. Although it is serious, it does not cause any health problems; the disease only disfigures the fish.
Fishes kept in aquariums or outside in ponds, are both susceptible to Lymphocystis disease. The painted glassfish is the most prone aquarium fish to contract this infection.
Symptoms and Types
The viral infection causes growths on the skin or fins, which look similar to cauliflowers.
The Lymphocystis disease does not pose an more]]> Skin Wed, 02 Jul 2008 15:20:57 +0000 138 at