1) Viruses are communicated from one host to the next through a structure called “virion”.
2) Viruses are characterized primarily dependent on outside structure, shape, size, capsid structure, and RNA and DNA nucleic acids.
3) Viruses reason malady by debilitating the host tissue or by shaping tumors in the host tissues.
4) There is no treatment for viral sicknesses, just prophylactic measures must be taken up.
a. Woodcock (1904) recognized this illness in fishes.
b. Marine, freshwater and aquarium fishes are powerless to this illness.
c. Tumor development is the significant character of this viral illness.
d. The outside sores are raised and comprised of the developing of granular,
nodular tissue which is made out of numerous significantly amplified have cells.
e. Matured sores may turn out to be somewhat hemorrhagic. Inside 6-15 days of disease the tumors develop to 50 thousand times.
f. The just control measure is anticipation.
1. Viral Hemorrhagic Septicemia (VHS)
a. This malady is brought about by an inconsistent molded fish infection with RNA.
b. This malady happens in salmon fishes. Transmission of the ailment happens through the water by lashes.
c. The side effects are kidney expanding, decreased hunger, clear trouble, whimsical winding swimming, different hemorrhages in skeletal muscles, change in body shading, rosy blades.
d. The main control measure is counteraction.
2. Infectious Pancreatic Necrosis (IPN)
a) This illness is found in trouts.
b) This illness causing high mortality of fry, fingerlings and infrequently bigger fishes.
c) The manifestations are obscuring distension, hemorrhages in ventral zones including bases of blades. There is articulated pancreatic putrefaction.
d) 200 ppm of chlorine is viable for treatment
3. Infective Hepatic Necrosis (IHN)
a) IHN was watched without precedent for trouts in British Columbia (Canada) in 1967.
b) Necrosis is seen in the hemopoietic tissue of kidney in tainted fish.
c) This infection happens more in fry and fingerlings and periodically in grown-ups.
d) The side effects are pale gills, rosy balances, dark coloration of the body, mid-region expanding and colossal mortality.
e) The side effects are clear in 12-45 days after the passage of infection into the host body.
4. Chinook malady
a) A little size infection is answerable for this ailment in Chinook salmon (Oncorhynchus tshawytscha) fingerlings.
b) The indications are exophthalmos, enlarged midsection, a dull red region on the dorsal surface front to dorsal blade.
c) The liver, spleen, kidney, gills and heart are pale.
d) The ailment is sent by the egg from the transporter female.
e) No treatment.
5. Channel Cat Fish Virus Disease
a) This ailment happens in fingerling of feline fish (Ictal urus punctatus).
b) The indications are that the fish show unusual swimming and pivoting, hemorrhagic regions on balances and mid-region, liquid aggregation in mid-region and pale gills.
c) There is no treatment for this ailment. Annihilation of tainted fish may forestall spread of the sickness