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

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Andrews, M (2010) Arthropod parasites of cultured striped trumpeter, Latris lineata (Forster, 1801), and potential treatments. PhD thesis, University of Tasmania.

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Abstract

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 papillomalike
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.

Item Type: Thesis (PhD)
Copyright Holders: The Author
Additional Information:

Available for use in the Library and copying in accordance with the Copyright Act 1968, as amended. Thesis (PhD)--University of Tasmania, 2010. Includes bibliographical references

Date Deposited: 25 Nov 2014 00:58
Last Modified: 23 Aug 2017 07:18
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