Venturis have their applications in some systems where there is more pressure available, than is required by the rest of the system components. Entry edited by Henrik Kreiberg Vertical transmission The transfer of a disease agent from a parent fish to one of it's progeny through reproduction see also Horizontal transmission . Most marine species are susceptible including anadromous species such as Atlantic Salmon and European eels. Infections of Vibriosis are more likely to occur in Spring, especially following the transfer of Atlantic Salmon to sea or other stressful periods. Virus An infective agent many times smaller than bacteria that are capable of infecting and multiplying in cells.
Viruses are the most feared type of disease as they are often untreatable.
Very few vaccines are available for viral diseases of fish. For many farms, the only remedy for some viral infections is complete slaughter of stock and disinfection of the farm. This is often enforced by government agencies, to protect other farms in the locality. Entry edited by Henrik Kreiberg Viscera The internal organs. Often used to describe processing wastes.