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Husbandry Initiatives

This project explores the feasibility of breeding Yazoo Darters in captivity to protect the species from habitat threats. Led by Daniel Schwarz and John Allen, our objectives include developing refined culture and rearing techniques, determining spawning cues, and establishing optimal environmental conditions. Initial collection included 3 males and 7 females, and we have maintained them under controlled conditions. Although spawning hasn't yet occurred, we plan to adjust environmental factors to promote reproduction and develop effective feeding regimes for the offspring.

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Husbandry Initiatives

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  1. Husbandry Initiatives Daniel Schwarz USFWS Private John Allen NFH

  2. Our objective • 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

  3. Collection and Rearing • 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 • Temperature controlled room • Six 115 L and Fifteen 64 L tanks • UV and Bio filters • 568 L sump

  4. Spawning trials (in aquaria) • 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

  5. Spawning trial (with current) • @ 69°F 2 males and 4 females were moved to constructed stream

  6. No spawning thus far • Current temperatures are 73°F • No spawning behavior has been observed • Males are beginning to show return of color • Plans to construct automatic lighting

  7. Future attempts • Spring 2013 • Collect Yazoo Darters • Allow to spawn immediately after returning to hatchery • Provide appropriate temp, photoperiod and substrate • After viable eggs are produced we can begin developing feeding regimes for offspring.

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