When working in Tasmania as a veterinary fish pathologist, the University of Tasmania were in the beginning stages of researching the striped trumpeter as an aquaculture species. They kept running into the issue of a parasitic infection that struck the larvae. These parasites seem to have an affinity for the nervous tissue, hence the scientific name “neuro” meaning “nerve”, and “phila” meaning “love”. The parasite seems to only infect the larvae within a certain age range, when their cartilage hasn’t fully ossified. So, to be able to bring up the fish past this age period could mean that we’re on the home run with making the culture of this species commercially viable.
During that time, only filtration seemed to be the option of getting around this issue. But this method is very costly and you wouldn’t be able to get the high volume of water exchange needed to maintain optimal water quality. Many other methods trialled led to infection by the parasites. This paper publishes data about using ultraviolet radiation as a way of nuking these bugs, to get the striped trumpeter larvae past this hurdle.
This finding has great transferability to other sectors including the treatment of ship ballast water in the prevention of pathogen or invasive organism transfer from port to port.
| Journal of Fish Diseases | |||||||||||||||||
| Volume 36, Number 1 (January 2013) | |||||||||||||||||
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Ultraviolet irradiation is an effective alternative to ozonation as a sea water treatment to prevent Kudoa neurophila (Myxozoa: Myxosporea) infection of striped trumpeter, Latris lineata (Forster) | ||||||||||||||||
| Authors: | J M Cobcroft, S C Battaglene | ||||||||||||||||
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| Source: | Journal of Fish Diseases, Volume 36, Number 1 (January 2013) | ||||||||||||||||
| Page Numbers: | 57 – 65 | ||||||||||||||||
| Available Full Text: |
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| Abstract: | Myxozoan parasites are known pathogens of cultured finfish. Kudoa neurophilan. comb. (Grossel, Dyková, Handlinger & Munday) has historically infected hatchery-produced striped trumpeter, Latris lineata (Forster in Bloch and Schneider), a candidate species for seacage aquaculture in Australia. We examined the efficacy of four water treatment methods to prevent K. neurophila infection in post-larval (paperfish) and juvenile striped trumpeter. Treatments included dose-controlled ultraviolet irradiation [hydro-optic disinfection (HOD)], ozone with conventional UV(ozone), mechanical filtration at 25 µm and then foam fractionation (primary filtration), and 50-µm-filtered sea water (control). In post-larvae (initially 10.3 ± 2.7 g, mean ± SD, 259 days post-hatching, dph), the infection prevalence (PCRtest) after 51 days was 93 ± 12% in the control, 100 ± 0% in primary filtration and 0 ± 0% in both ozone and HOD. Likewise, in juveniles (initially 114 ± 18 g, 428 dph), prevalence was 100 ± 0% in the control and primary filtration treatments with no infection detected in ozone and HOD. Concurrently, there was a 50–100% reduction in heterotrophic bacteria and 100% reduction in presumptive Vibriosp. in sea water HOD and ozone treatments. HOD with a dose of =44 mJcm-2UVwas as effective as ozonation at >700 mV ORPfor 10 min, in preventing K. neurophila infection. | ||||||||||||||||
| Citation: | J M Cobcroft, S C Battaglene . Ultraviolet irradiation is an effective alternative to ozonation as a sea water treatment to prevent Kudoa neurophila(Myxozoa: Myxosporea) infection of striped trumpeter, Latris lineata(Forster). Journal of Fish Diseases, Volume 36, Number 1 (January 2013), pp. 57-65, <http://ejournals.ebsco.com/direct.asp?ArticleID=472BA1B8E4754C97F1BD> | ||||||||||||||||
| URL: | http://ejournals.ebsco.com/direct.asp?ArticleID=472BA1B8E4754C97F1BD | ||||||||||||||||
