Growth, maximum daily ration and intraspecific cohabitation of the moray Gymnothorax polyuranodon (Muraenidae)in a freshwater aquarium

Ebner, Brendan C. (2017) Growth, maximum daily ration and intraspecific cohabitation of the moray Gymnothorax polyuranodon (Muraenidae)in a freshwater aquarium. Cybium, 41 (2). pp. 93-99.

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Abstract

Some predominantly marine fish families include a small proportion of species that are obligate freshwater inhabitants, and there is accumulating evidence for obligate freshwater species within the family Muraenidae. Whether the muraenid Gymnothorax polyuranodon (Bleeker, 1854) can survive, grow and coexist over an extended period in captive freshwater conditions was tested following repeated observations of this species in freshwater streams of the Australian Wet Tropics. Changes in the body size of four individuals held in a 1200 litre freshwater aquarium revealed that yearly growth ranged from a minimum of 21.0cm total length (TL) and 2.4 times body mass to 26.5 cm TL and 3.9 times body mass. Maximum daily ration of individuals (fed worms, prawns and fish) ranged from 3.4% to 3.9% of body mass. Individuals coexisted peacefully, with only brief bouts of intraspecific aggression that included biting. While the full life cycle of G. polyuranodon remains unresolved, the current study reinforces field observations and microchemistry insights indicating that this species can occupy and grow in freshwater ecosystems, and points toward the likelihood that the species probably plays an important and previously unrecognised mesopredatory role.

Item ID: 51477
Item Type: Article (Research - C1)
ISSN: 2101-0315
Keywords: anguilliformes; muraenidae; Gymnothorax polyuranodon; freshwater aquarium; maximum daily ration; growth
Funders: W.V. Scott, Tropical Landscapes Joint Venture
Date Deposited: 07 Nov 2017 05:40
FoR Codes: 06 BIOLOGICAL SCIENCES > 0602 Ecology > 060204 Freshwater Ecology @ 50%
05 ENVIRONMENTAL SCIENCES > 0502 Environmental Science and Management > 050210 Pacific Peoples Environmental Knowledge @ 50%
SEO Codes: 96 ENVIRONMENT > 9608 Flora, Fauna and Biodiversity > 960807 Fresh, Ground and Surface Water Flora, Fauna and Biodiversity @ 100%
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