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Branchial mechanical injury does not accelerate the progression of experimentally induced amoebic gill disease (AGD) in Atlantic salmon Salmo salar L
Citation
Adams, MB and Gross, KA and Nowak, BF, Branchial mechanical injury does not accelerate the progression of experimentally induced amoebic gill disease (AGD) in Atlantic salmon Salmo salar L, Aquaculture, 290, (1-2) pp. 28-36. ISSN 0044-8486 (2009) [Refereed Article]
DOI: doi:10.1016/j.aquaculture.2009.02.007
Abstract
It remains unclear whether the pathological severity of AGD can be exacerbated by injury to the branchial
epithelium; a circumstance that may arise in situ due to contact with harmful water-borne agents. Here,
results from an experimental laboratory infection are given, testing the assertion that branchial injury would
accelerate the pathological development of AGD. The lamellar epithelium of the left and right, first and
second, anterior hemibranchs of Atlantic salmon were damaged by physical abrasion and subsequently
exposed to Neoparamoeba perurans. Control groups of non damaged/infected and damaged/non-infected
fish were synchronously maintained for 32 days. Further undamaged fish were selected for mechanical
damage at day 16, following the onset of AGD. Gills were collected from each group and processed for routine
histology at 2, 4, 8, 16, 24 & 32 days post-exposure to Neoparamoeba spp. Mechanical injury initially resulted
in oedema, telangiectasis, haemorrhaging and leucocytic infiltration. During subsequent recovery, the
lamellae were fused with undifferentiated cells, mucous cells and leucocytes. The degree of lamellar fusion
(due to mechanical injury) had dissipated substantially by the conclusion of the trial. Trophozoites of
N. perurans were largely undetected upon mechanically injured portions of the gills for the duration of the
experiment. Concurrently, there was no significant difference between injured and control fish in terms of
AGD development over time, neither was there a significant difference within fish when comparing damaged
and undamaged hemibranchs. Together, these data suggest mechanical injury does not present an enhanced
opportunity for attachment and/or colonization of the gill epithelium in Atlantic salmon during
experimental infection with N. perurans.
© 2009 Elsevier B.V. All rights reserved.
Item Details
Item Type: | Refereed Article |
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Research Division: | Agricultural, Veterinary and Food Sciences |
Research Group: | Fisheries sciences |
Research Field: | Fish pests and diseases |
Objective Division: | Animal Production and Animal Primary Products |
Objective Group: | Fisheries - aquaculture |
Objective Field: | Aquaculture fin fish (excl. tuna) |
UTAS Author: | Adams, MB (Dr Mark Adams) |
UTAS Author: | Gross, KA (Miss Kally Gross) |
UTAS Author: | Nowak, BF (Professor Barbara Nowak) |
ID Code: | 60124 |
Year Published: | 2009 |
Web of Science® Times Cited: | 5 |
Deposited By: | NC Marine Conservation and Resource Sustainability |
Deposited On: | 2010-01-15 |
Last Modified: | 2012-03-05 |
Downloads: | 0 |
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