Laserfiche WebLink
<br />. <br /> <br />. <br /> <br />. <br /> <br />REFERENCE NUMBER: <br /> <br />CITATION: <br /> <br />015 <br /> <br />Papoulias, D. 1986. Food availability and mortality for larva! <br />razorback sucker, Xvrauchen texanus. Proceedings of the Desen <br />FIShes Counci1I8:210 (abstract). <br /> <br />SPECIES AND LIFE STAGE: <br /> <br />TOPICS: <br /> <br />KEYWORDS: <br /> <br />RZ, RZ_LARVAE <br /> <br />Diet, Research <br /> <br />RAZORBACK SUCKER, DIET, STARVATION <br /> <br />SUMMARY: Laboratory experiments were performed at the United Slates FISh and Wildlife Service, Dexter, <br />New Mexico facility at water temperatures of I8"C. To determine when larval razorback sucker <br />must encounter food or die, laIvae were staned on food at 4-day intervaJs. Those laIvae fed <br />beginning 25 and 29 days post-hatch had significantly higher mortalities than those laIvae fed <br />5, 9, 13, and 17 days after hatching. The effect of varying food. density on mortality was <br />investigated. Fish receiving 10 nauplii per liter per 8-hour period had greater than 70% <br />mortality. FISh which received no food throughout the experiment, as well as those fed at <br />varying time periods of prey densities, experienced peak mortalities between 20 and 30 days <br />post-hatch. The point of irreversible slaIVation was determined to be between 17 and 21 days <br />post-batch, and the critical period between 7 and 17 days post-hatch. <br /> <br />A-IS <br />