New Zealand Journal of Zoology abstracts
Hen eggs poisoned with sodium monofluoroacetate (1080) for control of stoats
(Mustela erminea) in New Zealand
E. B. SPURR
Landcare Research
P.O. Box 69
Lincoln, New Zealand
Abstract Control of stoats (
Mustela erminea) using
sodium monofluoroacetate (1080) injected into hen eggs was investigated in pen
and field trials. For captive stoats, the LD50 of 1080 in hen eggs was 0.49
mg/kg and the LD90 was 0.70 mg/kg. In a field efficacy trial using
1080-poisoned hen eggs in bait stations, consumption of eggs was reduced by
91.9% in the poison area relative to the non-poison area within 22 days. Video
recordings showed stoats, a possum, and a kea approached bait stations, but
only stoats entered and ate eggs. In subsequent live-trapping, one stoat was
caught in 91.5 trap nights (1.09/100TN) in the poison area and eight stoats in
101 trap nights (7.92/100TN) in the non-poison area. Assuming stoat numbers in
the two areas were similar before poison-baiting (a reasonable assumption based
on egg consumption rates), this represents an 86.2% reduction in the number of
stoats in the poison area relative to the non-poison area. Success should be
even greater in management operations, because 1080-poisoned eggs could be left
in the field for longer. Further trials using live-trapping or radio-telemetry
to monitor stoat survival are needed to substantiate these results.
Keywords stoats; Mustela erminea; baits; hen eggs;
sodium monofluoroacetate; 1080
Z99015
Received 13 May 1999; accepted 12 January 2000
PDF file of entire paper: medium quality (1608K); (scanned from paper original: notes about this process)
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