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Ultraviolet irradiation is an effective alternative to ozonation as a sea water treatment to prevent K udoa neurophila ( M yxozoa: M yxosporea) infection of striped trumpeter, Latris lineata (Forster)
Author(s) -
Cobcroft J M,
Battaglene S C
Publication year - 2013
Publication title -
journal of fish diseases
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.819
H-Index - 85
eISSN - 1365-2761
pISSN - 0140-7775
DOI - 10.1111/j.1365-2761.2012.01413.x
Subject(s) - ozone , biology , filtration (mathematics) , zoology , microbiology and biotechnology , chemistry , organic chemistry , statistics , mathematics
Myxozoan parasites are known pathogens of cultured finfish. K udoa neurophila n. comb. ( G rossel, D yková, H andlinger & M unday) has historically infected hatchery‐produced striped trumpeter, L atris lineata ( F orster in B loch and S chneider), a candidate species for seacage aquaculture in A ustralia. 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 ( PCR test) 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 V ibrio sp. in sea water HOD and ozone treatments. HOD with a dose of ≥44 mJ cm −2 UV was as effective as ozonation at >700 mV ORP for 10 min, in preventing K . neurophila infection.