26 
A. K. MORISON AND J. R. ANDERSON 
Further work 
Biochemical methods of examining variation 
among populations of G. brevipinnis , such as 
electrophoresis and mitochondrial DNA analy¬ 
sis, may provide more conclusive evidence as to 
the source of populations in north-eastern Vic¬ 
toria and therefore indicate the likely mechan¬ 
ism of their introduction. 
The introduction of G. brevipinnis to streams 
in north- eastern Victoria may lead to increased 
competition with indigenous species, in particu¬ 
lar G. olidus. G. brevipinnis and G. olidus nor¬ 
mally do not occur together in coastal streams 
(McDowall & Frankenberg 1981), although re¬ 
cent surveys in the Otways region recorded G. 
brevipinnis at two of the three sites at which G. 
olidus occurred (Koehn & O’Connor 1990). 
There has been some concern that G. brevipinnis 
has expanded its range in Tasmania at the ex¬ 
pense of other galaxiid species (W. Fulton, In¬ 
land Fisheries Commission, Tasmania, pers. 
comm). Other species of fish such as Gadopsis 
bispinosus, which are not naturally sympatric 
with G. brevipinnis, may also be adversely affec¬ 
ted by this addition to the local fish fauna. 
Further work will be needed to clarify the 
source, status and reproductive cycle of popu¬ 
lations of G. brevipinnis in north-eastern Vic¬ 
toria. Further survey work may record ad¬ 
ditional populations in the Murray-Darling 
Basin, would allow any potential expansion of 
known populations and the response of indigen¬ 
ous species to be monitored, and could also 
identify key features of the life cycle of this nor¬ 
mally amphidromous species. 
ACKNOWLEDGEMENTS 
We thank W. Blake and M. McGuckin for assist¬ 
ance with survey work, M. Gomon for allowing 
use of the Museum of Victoria’s radiography 
facility, R. Poole for the radiographs, T. Raadik 
for taxonomic advice, J. Paxton for details of 
Ga/axias specimens held by the Australian 
Museum, Sydney, W. McGuffick for advice on 
the Snowy Mountains Scheme, M. Jekabsons for 
assistance with data analysis and figure prep¬ 
aration, M. Batt for drafting assistance, and 
C. Sigley and C. McKenzie for word-processing. 
P. Cadwallader and D. Evans provided valuable 
comments on the draft manuscript. 
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