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Person

James M Long

Unit Leader - Research Fish Biologist
Cooperative Research Units

Email: jmlong@usgs.gov
Office Phone: 405-744-6342
Fax: 405-744-5006
ORCID: 0000-0002-8658-9949

Location
CRU COOP - OK FWRU - Agriculture Hall
007 Agriculture Hall
Stillwater , OK 74078-0611
US

Supervisor: Elisabeth B Webb
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Daily ages of young-of-year Silver Chub were estimated from counts of rings in lapilli otoliths. Lapilli were mounted to glass slides with thermoplastic cement and sanded to the core with 2000 grit sandpaper to expose daily rings. To improve clarity, sanded otoliths were polished with 0.3 μm alumina powder and a polishing cloth prior to viewing. To estimate daily age, counts of rings in otoliths were made under 100-200 magnification three times by one biologist with more than two decades of experience analyzing daily rings in otoliths. For each round of counts, lapilli were viewed in random order and without knowledge of fish length. For each otolith, we calculated the mean ring count and all pairwise differences....
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Diets were quantified in 282 age-0 sturgeon (15-120 mm) from four reaches of the Missouri River, none of which were pure pallid sturgeon. Prey items in the stomach were identified in the laboratory under microscope to taxonomic order and life stage (larvae, pupae, where appropriate), and counted. Consumption percentage (prey weight in the gut as a percentage of body weight) was measured to assess fullness.
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