The susceptibility of salmonid fish to an atypical strain of Aeromonas salmonicida that infects goldfish, Carassius auratus (L.), in Australia

Abstract

An enzootic, Australian, atypical strain oi Aeromonas salmonicida isolated from diseased goldfish, Carassius auratus (L.), was inoculated into Atlantic salmon, Salmo salar L.. brown trout, 5. trutta L.. rainbow trout, S. gairdneri Richardson, and brook trout. Salvelinus fontinalis (Mitchill), fingerlings by intraperitoneal injection (i.p.) and by bath challenge, the latter with and without prior abrasion of skin. The 10-day LDs(j (i-p.) was estimated to be 7-4 x 10^-^ colony forming units (cfu) for Atlantic salmon, 3-Ox 10"-cfu for brown trout, 3-7x10-cfu for brook trout and 6-4x10^ cfu for rainbow trout. Brown, rainbow and brook trout succumbed to bath challenges with between 10-''-10^cfu/mI, developing ulcers of the skin and septicaemia. The organism was trasmitted from inoculated fish to five of 195 within-tank control fish via water and established a carrier state in one of 14 Atlantic salmon. It was concluded that the organism poses a significant threat to the salmonid farming industry and wild saimonid fisheries in Australia.

Aeromonas salmonicida in Finland: pathological problems associated with atypical and typical strains

“…Total of 1461 roach, Rtttilus rtitihis (L.), perch, Perca fluviatilis (L.), and whitefish, Coregonus sp., from four lakes on the same watercourse as the farms in central Finland have also been studied for pathogenic bacteria, but no A. salmonicida strains have been found (Valtonen & Koskivaara, unpublished data). As noted by Whittington & Cullis (1988) and Carson & Handlinger (1988), an atypical strain of A. salmonicida isolated from goldfish, Carassius auratus (L.), is highly virulent to salmonid fish and poses a significant threat to the salmonid farming industry and the fishing of wild salmonids in Australia. Therefore, it would be interesting to determine whether the wild fish of northern Finland are carriers of A. salmonicida.…”

Alien fish ascendancy and native fish extinction: ecological history and observations on the Lower Goodradigbee River, Australia

“…Atypical A. salmonicida was presumably brought into the Lower Goodradigbee River by alien carp immigrating from Z www.publish.csiro.au/pc Pacific Conservation Biology Burrinjuck Reservoir. Other possibilities include an origin from contaminated alien trout stockings (Whittington and Cullis 1988;Whittington 1989;Kaminskas 2021), or from contaminated carp or goldfish in an outdoor pond somewhere in the Goodradigbee catchment. It is noteworthy one pool with particularly high numbers of ulcerated carp (Fig.…”

Susceptibility of a number of Australian freshwater fishes to dwarf gourami iridovirus (Infectious spleen and kidney necrosis virus)

“…This pathogen can affect the industries farming Atlantic salmon, Salmo salar (L.) and rainbow trout, Oncorhynchus mykiss (Walbaum) and at least one native species, silver perch (Whittington et al . ; Whittington & Cullis ). There are 22 species of imported ornamental fish with established breeding populations in the wild in Australia (Lintermans ), proving the existence of a direct pathway for imported ornamental fish to come into contact with wild native fish.…”