University of Tasmania

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Arthropod parasites of cultured striped trumpeter, Latris lineata (Forster, 1801), and potential treatments

posted on 2023-05-26, 22:51 authored by Andrews, M
The striped trumpeter, Latris lineata (Actinopterygii: Perciformes: Latridae), was identified as a possible aquaculture species, however little was known about the health of this species in the grow-out stage. The aim of this thesis was to investigate parasite fauna in a culture situation. Three parasite species were described from striped trumpeter held in tank and sea cage systems; including the previously described isopod, Ceratothoa imbricata (Fabricius, 1775) and the description of two new species; Chondracanthus goldsmidi Tang, Andrews et Cobcroft, 2007 and Caligus nuenonnae Andrews, Bott, Battaglene et Nowak, 2009. Patterns of infection were investigated for all three species from striped trumpeter in tank and sea cage systems, identifying differences in the parasite fauna of fish reared in the two systems. Caligus nuenonnae and Chondracanthus goldsmidi were identified from fish in both systems, whilst Ceratothoa imbricata only occurred in the fish held in the cages. Chondracanthus goldsmidi, the first of this family identified from a cultured host, was identified as a potential problem, as infections were common and prevalence and intensity high on fish in the tank system. The female developmental stages have been fully described for this species, comprising three nauplius and six copepodid stages; providing the first description for the Chondracanthus genus. Gill and opercula pathology resulting from parasitism of adult C. goldsmidi was severe, including papilloma-like lesions, epithelial hyperplasia and necrosis near the attachment site. Piscidin positive mast cells and high densities of mucous cells containing a combination of neutral and acidic mucin were also identified in the parasitised gill epithelia. The presence of such cellular reactions indicates that an active host response is underway to combat the parasitic infection. Treatment experiments were conducted to find practical solutions for C. goldsmidi infections. Mean parasite survival after bathing was as follows; 35 min exposure to dechlorinated freshwater (64.2 ± 1.3%; mean ± SE); 45 min exposure to 1500 ppm hydrogen peroxide (50 ± 0%); 1 h exposure to 200 ppm trichlorfon (93.6 ± 1.6%). Emamectin benzoate in-feed treatment using four concentrations (0, 25, 50, 100 u g kg\\(^{-1}\\)) was applied in two treatment rounds, the first round resulted in an initial decrease of the infection followed by an increase in all treatments after the second treatment; with the following mean parasite survival in the controls (110.7 ± 5.0%; from an initial 100% baseline), 25 u g kg\\(^{-1}\\) (93.7 ± 17.6%), 50 u g kg\\(^{-1}\\) (90.9 ± 5.2%) and 100 u g kg\\(^{-1}\\) (95.7 ± 4.2%) treatments. Freshwater and hydrogen peroxide bathing exhibited the most potential if used with caution as striped trumpeter exhibited sensitivity to long exposures.


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Copyright 2010 the author - The University is continuing to endeavour to trace the copyright owner(s) and in the meantime this item has been reproduced here in good faith. We would be pleased to hear from the copyright owner(s). Chapter 5 appears to be the equivalent of the pre-peer reviewed version of the following article: Andrews, M., Battaglene, S., Cobcroft, J., Adams, M., Noga, E., Nowak, B., 2010. Host response to the chondracanthid copepod Chondracanthus goldsmidi, a gill parasite of the striped trumpeter, Latris lineata (Forster), in Tasmania, Journal of fish diseases, 33: 211-220, which has been published in final form at This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions. Appendix 2 is the following published article: Andrews, M., Cobcroft, J. M., Nowak, B. F., Battaglene, S. C., 2009. Identification and control of parasites in a new species for aquaculture: a case study with striped trumpeter, World aquaculture magazine, 40(1), 30-32

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