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Aquimarina sp. associated with a cuticular disease of cultured larval palinurid and scyllarid lobsters

Citation

Ooi, MC and Goulden, EF and Trotter, AJ and Smith, GG and Bridle, AR, Aquimarina sp. associated with a cuticular disease of cultured larval palinurid and scyllarid lobsters, Frontiers in Microbiology, 11, (OCT) Article 573588. ISSN 1664-302X (2020) [Refereed Article]


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Copyright Statement

Copyright © 2020 Ooi, Goulden, Trotter, Smith and Bridle. Licensed under Creative Commons Attribution 4.0 International (CC BY 4.0) https://creativecommons.org/licenses/by/4.0/

DOI: doi:10.3389/fmicb.2020.573588

Abstract

Shell (cuticular) disease manifests in various forms and affects many crustaceans, including lobsters. Outbreaks of white leg disease (WLD) with distinct signs of pereiopod tissue whitening and death have been observed in cultured larvae (phyllosomas) of ornate spiny lobster Panulirus ornatus, eastern rock lobster Sagmariasus verreauxi, and slipper lobster Thenus australiensis. This study aimed to characterise and identify the causative agent of WLD through morphological and molecular (16S rRNA gene and whole genome sequencing) analysis, experimental infection of damaged/undamaged P. ornatus and T. australiensis phyllosomas, and bacterial community analysis (16S rRNA gene amplicon sequencing) of P. ornatus phyllosomas presenting with WLD during an outbreak. Bacterial communities of WLD-affected pereiopods showed low bacterial diversity and dominant abundance of Aquimarina spp. compared to healthy pereiopods, which were more diverse and enriched with Sulfitobacter spp. 16S rRNA gene Sanger sequencing of cultures from disease outbreaks identified the dominant bacterial isolate (TRL1) as a Gram-negative, long non-flagellated rod with 100% sequence identity to Aquimarina hainanensis. Aquimarina sp. TRL1 was demonstrated through comparative genome analysis (99.99% OrthoANIu) as the bacterium reisolated from experimentally infected phyllosomas presenting with typical signs of WLD. Pereiopod damage was a major predisposing factor to WLD. Histopathological examination of WLD-affected pereiopods showed masses of internalised bacteria and loss of structural integrity, suggesting that Aquimarina sp. TRL1 could enter the circulatory system and cause death by septicaemia. Aquimarina sp. TRL1 appears to have important genomic traits (e.g., tissue-degrading enzymes, gliding motility, and aggregate-promoting factors) implicated in the pathogenicity of this bacterium. We have shown that Aquimarina sp. TRL1 is the aetiological agent of WLD in cultured Palinurid and Scyllarid phyllosomas and that damaged pereiopods are a predisposing factor to WLD.

Item Details

Item Type:Refereed Article
Keywords:white leg disease, Aquimarina sp., Koch’s postulates, cultured lobster, Palinurid larvae, Scyllarid larvae
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Fisheries sciences
Research Field:Aquaculture
Objective Division:Animal Production and Animal Primary Products
Objective Group:Fisheries - aquaculture
Objective Field:Aquaculture rock lobster
UTAS Author:Ooi, MC (Miss Mei Ooi)
UTAS Author:Goulden, EF (Dr Evan Goulden)
UTAS Author:Trotter, AJ (Dr Andrew Trotter)
UTAS Author:Smith, GG (Professor Gregory Smith)
UTAS Author:Bridle, AR (Associate Professor Andrew Bridle)
ID Code:141360
Year Published:2020
Funding Support:Australian Research Council (IH190100014)
Deposited By:Fisheries and Aquaculture
Deposited On:2020-10-16
Last Modified:2021-02-17
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