Trophic shifts in three subtropical Australian halfbeaks (Teleostei : Hemiramphidae)

Tibbetts, I. R. and Carseldine, L. (2005) Trophic shifts in three subtropical Australian halfbeaks (Teleostei : Hemiramphidae). Marine And Freshwater Research, 56 6: 925-932. doi:10.1071/MF04305

Author Tibbetts, I. R.
Carseldine, L.
Title Trophic shifts in three subtropical Australian halfbeaks (Teleostei : Hemiramphidae)
Journal name Marine And Freshwater Research   Check publisher's open access policy
ISSN 1323-1650
Publication date 2005-01-01
Year available 2005
Sub-type Article (original research)
DOI 10.1071/MF04305
Open Access Status Not yet assessed
Volume 56
Issue 6
Start page 925
End page 932
Total pages 8
Editor Dugald McGlashan
Place of publication Collingwood
Publisher CSIRO Publishing
Language eng
Subject C1
770302 Living resources (incl. impacts of fishing on non-target species)
270603 Animal Physiology - Systems
Abstract To elucidate the trophic status of hemiramphids, the diets of three species from subtropical south-east Queensland were investigated. All undergo a marked ontogenetic trophic shift from an animal to plant diet, which occurred between 50 and 70mm standard length (L-s) for Arrhamphus sclerolepis krefftii ( freshwater) and between 80 and 110mm L-s for both Hyporhamphus regularis ardelio and H. quoyi ( both marine). After the ontogenetic shift, the diet of A. sclerolepis krefftii is dominated by filamentous algae, whereas the diet of the two marine species is dominated by Zostera capricorni. The two marine species feed mainly during the day, with gut fullness dropping markedly after dusk. Neither showed evidence of a diel trophic shift between herbivory and carnivory that has been reported for other hemiramphids. The lack of diel trophic switching in these subtropical hemiramphids may suggest that latitudinal effects on daylength and/or water temperature may influence the extent to which hemiramphids switch periodically to animal prey from an otherwise essentially herbivorous diet in order to balance their nutrient requirements.
Keyword Fisheries
Marine & Freshwater Biology
Ontogenetic Shift
Trophic Plasticity
Garfish Hyporhamphus-melanochir
Q-Index Code C1
Institutional Status UQ

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Created: Wed, 15 Aug 2007, 17:48:10 EST