Original sentence: Fish defences against disease can be divided into specific and non-specific defences.In recent years, vaccines have become widely used in aquaculture and also with ornamental fish, for example the vaccines for furunculosis in farmed salmon and koi herpes virus in koi.Like humans and other animals, fish suffer from a wide variety of diseases and parasites.Non-specific defences include the skin and scales, as well as the mucus layer secreted by the epidermis that traps microorganisms and inhibits their growth.Should pathogens breach these defences, fish can develop an inflammatory response that increases the flow of blood to the infected region and delivers the white blood cells that will attempt to destroy the pathogens.Specific defences are specialised responses to particular pathogens recognised by the fish's body, in other words, an immune response
Edited sentence: Fish defences against disease are specific and non-specific.If pathogens breach these defences, fish can develop inflammatory responses that increase the flow of blood to infected areas and deliver white blood cells that attempt to destroy the pathogens.In recent years, vaccines have become widely used in aquaculture and ornamental fish, for example vaccines for furunculosis in farmed salmon and koi herpes virus in koi.Like humans and other animals, fish suffer from many diseases and parasites.Non-specific defences include skin and scales, as well as the mucus layer secreted by the epidermis that traps microorganisms and inhibits their growth.Specific defences are specialised responses to particular pathogens recognised by the fish's body, that is immune responses