Fish Viral Diseases - Organic Supplements

This is an acute haemorrhagic disease in juvenile channel catfish (Ictalurus punctatus). 

Gross pathological signs are:

swollen abdomen.

exophthalmos (popeye)

haemorrhaging of fins and ventral abdomen.

haemorrhaging of the musculature, liver and kidneys.

dark and enlarged spleen.

fluid in the abdominal cavity.

pale, enlarged kidneys, which may be the only internal indication of disease in infected fish.

Clinical disease may be characterised by a swollen abdomen or eyes, darkening of the skin, spiral swimming and faecal casts trailing from the vent. Internally there may be pancreatic necrosis, a catarrhal exudate in the intestine and haemorrhages in the visceral organs.

The clinical signs are nonspecific. In carp, the most common symptoms include abdominal distension, exophthalmia, inflammation or edema of the vent (often with trailing mucoid fecal casts), and petechial hemorrhages of the skin, gills and eyes. The body is often darkened with pale gills.

Clinical sigs of acute viral hemorrhagic septicemia may be nonspecific and include lethargy, darkening of the skin, anemia (evidenced by pale gills), and hemorrhages in many locations including the skin at the base of fins, muscles (dorsal musculature), gills, internal organs, meninges, and eyes.

Clinical signs of infection with IHNV include abdominal distension, bulging of the eyes, skin darkening, abnormal behavior, anemia, and fading of the gills. Infected fish commonly hemorrhage in several areas - the mouth and behind the head, the pectoral fins, muscles near the anus, and (in fry) the yolk sac.

Esocid lymphosarcoma, also known as Esox lymphosarcoma is a transmissible tumor which affects two species of fish, northern pike (Esox lucius) and Muskellunge (Esox masquinongy), in North America and Europe. ... The disease is spread by physical contact between fish, probably during the spring spawning season.  Lesions or large tumors on the skin are the most visible signs of the disease. 

It is the most serious infectious disease of carp and causes serious losses of fingerlings of grass carp and black carp. It is the causative agent of hemorrhagic disease in infected grass carp.

Herpesvirus disease of salmonids has two types: HPV-1 and HPV-2. Fishes with HPV-1 have enlarged eyes and an accumulation of fluids in the abdomen; their internal organs and muscles will also swell and accumulate fluids. HPV-1 infection is usually seen in trout species. 

HPV-2, on the other hand, infects rainbow trout, coho, kokanee, masou and chum salmon. Fishes with HPV-2 commonly develop cancer on their jaws and on the skin of their fins. Symptoms for this infection include lethargy, loss of appetite, and darkened and bloody pigmentation of the fish's body wall.

Hirame rhabdovirus virus (HIRRV) is a rhabdovirus that causes acute hemorrhage disease in fish culture, resulting in a great economic loss in parts of Asia and Europe. This commonly causes hemorrhage of the mouth, pale liver, petechial hemorrhaging in the internal fat, and an enlarged spleen.

Also called - Viral erythrocytic necrosis

External signs may be subtle or nonexistent; sick fish anaemic, which may result in pale gills and internal organs

Oncorhynchus masou virus disease (OMVD) is an economically significant disease of farmed salmonid fish (salmon and rainbow trout) in Japan. This infection also occurs in wild fish. In young fish, OMVD is a systemic disease with a high mortality rate.

The clinical signs may include lethargy, anorexia, darkening of the body, skin ulcers and petechiae. Many fish die. Four to eighteen months later, some surviving fish develop epitheliomas (cutaneous carcinomas). 

Causes acute to subacute hemorrhagic infection, causing generalized edema, hematopoietic necrosis, and high mortality in fiy of Esox lucius.

Main symptoms are skin ulcerations and mortality

This is an acute hemorrhagic and contagious viral infection-typically of cyprinids and more specifically of the common carp

Causes transient focal lesions of benign, nonnecrotizing epidermal hyperplasia.

Juvenile fish can be adversely affected by Carp Pox and can suffer a high mortality, developing signs such as anorexia, intermittent immobility, exophthalmia, darkened skin and haemorrhages on the operculum and abdomen. Adult fish usually show no other signs.

Symptoms include bleeding from the back eyes and the head. The virus is 70 nm in diameter and replicates best at 20-30 degrees Celsius. The virus has properties similar to those of the pancreatic necrosis virus. This could mean that golden shiners are more susceptible in the summer.

The viral infection causes growths on the skin or fins, which look similar to cauliflowers. The fish start growing small white pin-prick like growths on their fins or skin and this is often mistaken for infection by Ichthyophthirius multifiliis in the early stages. It soon clumps together to form a cauliflower-like growth on the skin, mouth, fins, and occasionally the gills.

Viral nervous necrosis can have a clinical or sub-clinical presentation. Signs include: abnormal behaviour like lethargy, anorexia, spiral swimming; and change in pigmentation. Mortalities of affected populations can be of up to 100%

This can affect many species of fish. Symptoms vary. The most common signs and symptoms are - white patches are due to necrosis (death) of the gill tissue. Other external signs may include bleeding gills, sunken eyes, and pale patches on the skin.

The cod ulcus disease is an ulcerating condition in the skin of Atlantic cod (Gadus morhua) taken from the coastal waters of Denmark. The first stage is the appearance of multiple dermal papules, some of which may be hemorrhagic. These may develop into grey to yellow crater-like perforations of the skin which in turn may lead to varying degrees of ulceration with the lesions being 2-8 cm in diameter. The disease can result in significant mortalities. 

This is said to cause massive mortality in fish in Connecticut region.

ASPV has been associated with proliferative gill inflammation in sea-reared yearling fish

This causes - acute necrosis of proximal renal tubules in addition to liver pathology. Sometimes this causes heavy mortality without exhibiting any clinical signs.