Chapter 57 : Fishy Business

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There is an increase in the frequency of papers appearing in wide-ranging microbiology journals on fish infections and methods of combating them. First, the traditional toil of hauling fish out of the seas in nets has, like cattle ranching on land, reached its productive limit. Second, this shift has triggered a massive expansion of fish farming, which is now the fastest growing sector of the world's food economy. Third, these seismic changes are underlining the pressing need to deal more effectively with the largest causes of financial losses in aquaculture: the molds and bacteria responsible for fish diseases. One recent development is already being harnessed in the battle against bacterial fish diseases. This is the use of naturally antagonistic organisms, thought to function either by competitive inhibition, by nonspecifically enhancing immunity, or by modifying the environment. The fact that AB1 was isolated from the gut of apparently healthy rainbow trout confirms the potential role of gut microorganisms in exerting an important role in the wellbeing of the host fish. Probably the most important single advance in fish pathology over the past year has been the delineation of the complete genome sequence of . Causing extensive necrosis known as "cold-water disease" in mature fish and a lethal hemorrhagic septicemia in young fish, is responsible for considerable economic losses in all major areas of salmonid aquaculture.

Citation: Dixon B. 2009. Fishy Business, p 270-274. In Animalcules. ASM Press, Washington, DC. doi: 10.1128/9781555817442.ch57
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1. Benediktsdóttir, E.,, and K. J. Heidarsdóttir. 2007. Growth and lysis of the fish pathogen Moritella viscosa. Lett. Appl. Microbiol. 45: 115 120.
2. Duchaud, E.,, M. Boussaha,, V. Loux,, J. F. Bernardet,, C. Michel,, B. Kerouault,, S. Mondot,, P. Nicolas,, R. Bossy,, C. Caron,, P. Bessières,, J. F. Gibrat,, S. Claverol,, F. Dumetz,, M. Le Hénaff,, and A. Benmansour. 2007. Complete genome sequence of the fish pathogen Flavobacterium psychrophilum. Nat. Biotechnol. 25: 763 769.
3. Newaj-Fyzul, A.,, A. A. Adesiyun,, A. Mutani,, A. Ramsubhag,, J. Brunt,, and B. Austin. 2007. Bacillus subtilis AB1 controls Aeromonas infection in rainbow trout ( Oncorhynchus mykiss, Walbaum). J. Appl. Microbiol. 103: 1699 1706.
4. van West, P. 2006. Saprolegnia parasitica, an oomycete pathogen with a fishy appetite: new challenges for an old problem. Mycologist 20: 99 104.

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