Bacterial Fish Pathogens: Disease of Farmed and Wild Fish by Brian Austin, Dawn A. Austin

By Brian Austin, Dawn A. Austin

This revised variation fills the necessity for an up to date entire booklet at the organic points of the bacterial taxa which reason illness in fish. because the third version was once released in 1999, a lot has replaced within the regulate of ailment of farmed and wild fish. This publication analyses the entire new details, together with that on new pathogens and new advancements on lengthy verified illnesses, corresponding to furunculosis and vibriosis. attention is given to all the bacterial taxa that have at your time been suggested as fish pathogens, whether or not they are secondary invaders of already broken tissue or critical, fundamental pathogens.

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Tenacibaculum ovolyticum T. ovolyticum led to mortahties among halibut eggs and larvae. The chorion became dissolved, and the underlying zona radiata was damaged by exotoxins resulting in puncturing of the egg, leakage of cell constituents and larval death (Hansen et aL, 1992). Francisellaceae representative Francisella sp. 5°C. Mortahties peaked in August, and over the 5-month period to November ~40% of the stock had died. Initially, cHnical signs of disease were not noted, but later the fish were observed to be swimming sluggishly, were generally inappetent, and Characteristics of the diseases 35 became emaciated.

In separate developments, an organism, subsequently identified as Str. A. , 1996), in white spotted rabbitfish (Siganus canaliculatus) in Bahrain (Yuasa et al, 1999), in barramundi (Lates calcarifer) in Australia 18 Bacterial Fish Pathogens (Bromage et ai, 1999) and in caged and wild fish from the Red Sea (Colorni et ai, 2002). Sir. iniae serotype II infection led to rainbow trout displaying lethargy, discoloration, loss of orientation, bilaterial exophthalmia, corneal opacity and haemorrhaging in the eye, and surface and internal (mostly in the spleen and fat around the intestine) haemorrhaging leading to death (Lahav et ai, 2004).

But, it is now recognised to infect both marine and freshwater fish and also human beings (Van Duijn, 1981). Currently, Myc. , 2004). Here, an epizootic has developed, and fish experimentation has revealed the development of large aggregates of macrophages, which contain phagocytosed bacteria, with Myc. marinum contained exclusively within phagosomes. ), although isolation of the pathogen was not achieved (Alexander, 1913). Myc. A. , 2003). Myc. , 1990). Nodules may form in the muscle, where they are visible on the outside of the fish.

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