RE: tularosa revisited

Adrian R.Tappin (atappin at ecn.net.au)
Tue, 02 Apr 1996 19:44:50 -1000

On Mon, 1 Apr 1996, Mark Bagley wrote - Peter Unmack replied:

One point of caution here. Many of the fish that you see in shops in
the US (and elsewhere no doubt) are wild fish. Unless you have bred
these species for 5 or more generations you are probably not going to see
much inbreeding depression. Plus it depends upon the species. Some can
deal with inbreeding better than others. Overall though, I think your
point is a good one. Wouldn't it be interesting to compare the genetic
diversity of some select species that have been maintained in captivity
for many generations vs those in the wild. This would be especially easy
in a country such as Australia where many species have been illegal
imports since the mid 80's thus have been "inbreeding" for over 10 years
(except the few illegal ones that get smuggled in). You could then
compare that to a country that does allow importation and also wild
populations.

One species on which the above was researched was M.eachamensis in _Evol
utionary Distinctiveness and Conservation Status of the Lake Eacham Rainbow
Fish_ by Craig Moritz, Danqing Zhu and Sandie Dergan - Centre for
Conservation Biology and Department of Zoology, University of Queensland.

Captive fish supplied to them had been bred and maintained in aquaria for
10-12 years and after examination by Moritz et al:

Some extracted comments:

"Several observations indicate that the captive stocks of eachamensis have
retained a substantial amount of genetic diversity. First, the mtDNA
diversity of captive eachamensis is comparable to that among splendida
ranging from Atherton Tablelands to the Burdekin River".

"The loss of variation through genetic drift in captivity appears minor"

"Although the founder population sizes were small, it appears that a
combination of rapid distribution of founders among aquarists, the
longevity of the fish, and the rapid expansion of the Walkamin stocks have
prevented substantial erosion of genetic variation."

"From a purely genetic view, the more genetically diverse captive fish may
be a better source of fish for any reintroduction than is the Dirran Ck.
population (wild stock)."

_Aquarists of the world - take a bow_

Adrian Tappin.

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