Daniel Schwarz USFWS Private John Allen NFH. If threat on natural habitat, can Yazoo Darters be...
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Transcript of Daniel Schwarz USFWS Private John Allen NFH. If threat on natural habitat, can Yazoo Darters be...
If threat on natural habitat, can Yazoo Darters be successfully bred and reared in captivity?
Develop/refine culture and rearing techniques
◦ Determine spawning cues for species
Water temp, photoperiod, substrate composition and possibly current
◦ Develop feeding regime
Our objective
Collected March 2012◦ 3 male 7 female
Fish were kept in 3 tanks (115 L) 1 male and 2 female per tank.
Maintain on a recirc. sys. @ 65°F until Aug. ◦ Constant light to inhibit spawning◦ Males lost coloration
Collection and Rearing
• Temperature controlled room
•Six 115 L and Fifteen 64 L tanks
•UV and Bio filters
•568 L sump
On 8/3/2012 spawning substrate (sand, gravel, boulder, woody debris) was added to one tank.
Temp was increased by 2°F every 2 weeks to 69°F (Johnston and Haag 2006)
Photoperiod was manually controlled to simulated natural conditions
Spawning trials (in aquaria)
Current temperatures are 73°F
No spawning behavior has been observed
Males are beginning to show return of color
Plans to construct automatic lighting
No spawning thus far