Effect of temperature and salinity on egg hatching and description of the life cycle of Lernanthropus latis (Copepoda: Lernanthropidae) infecting barramundi, Lates calcarifer

Brazenor, Alexander K., and Hutson, Kate S. (2013) Effect of temperature and salinity on egg hatching and description of the life cycle of Lernanthropus latis (Copepoda: Lernanthropidae) infecting barramundi, Lates calcarifer. Parasitology International, 62 (5). pp. 437-447.

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Abstract

The parasite Lernanthropus latis (Copepoda: Lernanthropidae) is a major threat to the sustained mariculture of barramundi, Lates calcarifer (Perciformes: Latidae). We investigated the effect of water temperature and salinity on egg hatching success of L. latis and describe the life cycle for the first time. Wild and sea-caged L. calcarifer examined in tropical north Australia exhibited similar parasite prevalence (range: 80-100%) and mean parasite intensity (range: 3-6), whereas land-based maricultured fish were not infected. Hatching success and time to first and last hatch was determined for a range of water temperature (22, 30, 32 and 34 degrees C) and salinity (0, 11, 22, 35 and 40 parts per thousand) combinations representing current and predicted climate conditions. There was a significant interaction between water temperature and salinity on the hatching success of L. latis nauplii. Eggs hatched in all temperature treatments, with the greatest hatching success at 30 degrees C and 32 degrees C (98 and 92% success, respectively) in 35 parts per thousand. Hatching did not occur at 0 parts per thousand and was severely reduced at 11 parts per thousand (1.6% success). Hatching began within 6 h at all water temperatures with >95% of eggs hatched within 30 h at 30, 32 and 34 degrees C and within 60 h at 22 degrees C. Adult parasites differed from the original description by the presence of the parabasal flagellum, small setae on the legs and caudal rami and minor incongruences regarding morphological measurements. The life cycle of L. latis includes three free living stages and five parasitic stages. Although L. latis exhibits broad environmental tolerance, freshwater can be used as an effective management strategy to break the life cycle in aquaculture.

Item ID: 29287
Item Type: Article (Research - C1)
ISSN: 1873-0329
Keywords: aquaculture, Asian sea bass, copepod, life cycle, climate, Siphonostomatoida
Funders: James Cook University (JCU), National Climate Change Adaptation Research Facility (NCCARF), Fisheries Research and Development Corporation (FRDC), Australian Biological Resources Study
Projects and Grants: NCCARF Project no. NATCLI97, FRDC Project no. 2010/521, Australian Biological Resources Study 2007-44
Date Deposited: 11 Sep 2013 05:26
FoR Codes: 07 AGRICULTURAL AND VETERINARY SCIENCES > 0704 Fisheries Sciences > 070401 Aquaculture @ 100%
SEO Codes: 83 ANIMAL PRODUCTION AND ANIMAL PRIMARY PRODUCTS > 8301 Fisheries - Aquaculture > 830102 Aquaculture Fin Fish (excl. Tuna) @ 100%
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