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Temperature alters reproduction and maternal provisioning in a fish ectoparasite

journal contribution
posted on 22.09.2020, 00:00 authored by AK Brazenor, DS Francis, JA Conlan, Alexander CartonAlexander Carton, KS Hutson
This study quantified the effects of temperature on reproduction and maternal provisioning of the fish ectoparasite, Neobenedenia girellae (Platyhelminthes: Monogenea), a species known to cause detrimental impacts to aquaculture species in tropical and subtropical environments worldwide. At 20 and 25 ºC, parasites exhibited relatively slower production of larger eggs that were energy-dense. In contrast, parasites at 30 °C attained sexual maturity faster, were reproductively active over a shorter period, grew to a smaller size and laid smaller, less energy-rich eggs at a faster rate. As such, parasites exhibited two distinct reproductive patterns in response to temperature: parasites at lower temperatures produced larger eggs with higher energy content, while those at the higher temperature had a higher rate of egg production. Larger eggs produced in cooler conditions were better provisioned with energetic reserves and important, membrane-bound lipids that would likely facilitate larval longevity and development success. This is commensurate with previous observations of epizootics of this parasite species in aquaculture systems during winter. Meanwhile, eggs produced at 30 °C contained higher proportions of saturated fatty acids compared to polyunsaturated fatty acids, likely reflecting metabolic regulation of cell membrane fluidity, which is necessary for larvae to survive warm conditions. This study demonstrates that fish ectoparasites have evolved substantial reproductive and metabolic flexibility to maximise infection success in variable environmental conditions.

Funding

Category 3 - Industry and Other Research Income

History

Volume

50

Issue

10-11

Start Page

839

End Page

849

Number of Pages

11

eISSN

1879-0135

ISSN

0020-7519

Publisher

Elsevier

Peer Reviewed

Yes

Open Access

No

Acceptance Date

24/03/2020

Author Research Institute

Coastal Marine Ecosystems Research Centre (CMERC)

Era Eligible

Yes

Journal

International Journal for Parasitology