Growth and Appetite of Juvenile Lake Sturgeon, Acipenser Fulvescens PDF Download
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Author: James S. Diana
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 18
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Author: James S. Diana
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 18
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Author: Kevin E. Wehrly
Publisher:
ISBN:
Category : Lake sturgeon
Languages : en
Pages : 29
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Author: Cheryl Klassen
Publisher:
ISBN:
Category :
Languages : en
Pages :
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Author: Todd Michael Amacker
Publisher:
ISBN:
Category : Lake sturgeons
Languages : en
Pages : 63
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After fifteen years of reintroducing juvenile Lake Sturgeon (Acipenser fulvescens) in the Upper Tennessee River Basin, fisheries biologists are researching basic ecological traits of subsistent organisms. I set out to seasonally assess whether Lake Sturgeon forage opportunistically or selectively in Ft. Loudoun Reservoir. After anesthetizing individual juvenile Lake Sturgeon caught on trotlines in a 13-km reach of the reservoir, I used colonic flush and gastric lavage techniques to describe diets quantitatively. I also used two methods to assess available prey items in the study area by 1) taking systematic benthic grabs along several transects across the width of the reservoir and 2) opportunistically deploying rock cages filled with various types of hard substrate to assess potential prey that colonize hard surfaces. After identifying macroinvertebrates to their lowest taxonomic level, the foraging modes of Lake Sturgeon were determined by comparing the relative abundances of invertebrate taxa in the gut contents of each sturgeon specimen to the relative abundances of the same invertebrate taxa collected from the resource base. Indices that quantify resource overlap or segregation were used to determine how selective Lake Sturgeon in Ft. Loudoun Reservoir were with respect to diet. I conclude that Lake Sturgeon in Ft. Loudoun Reservoir forage primarily in the benthos where they utilize a relatively narrow niche consisting mostly of larval chironomids, some genera of which they prey upon selectively. Comprehensive conclusions regarding Lake Sturgeon foraging patterns, niche utilization, and selective predation can only be drawn if researchers a) determine the seasonally available prey base by identifying macroinvertebrates to genus/species level b) analyze diet composition (again, identifying prey items to genus/species) from both stomach and intestinal contents and c) use a combination of indices that determine how selective, if at all, Lake Sturgeon are when utilizing the available prey base.
Author: James Andrew Crossman
Publisher:
ISBN:
Category : Fish stocking
Languages : en
Pages : 388
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Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 898
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Author: Ahmed Waheed
Publisher:
ISBN:
Category :
Languages : en
Pages : 228
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Sturgeon -- Stress -- Microscopy -- Physiology -- Catecholamine -- Chromaffin -- Juvenile -- Larvae -- Kidney.
Author: Ontario. Ministry of Natural Resources
Publisher:
ISBN:
Category :
Languages : en
Pages : 106
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Author: Forrest Bjornson
Publisher:
ISBN:
Category :
Languages : en
Pages : 0
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Hatchery supplementation of declining fish populations is often used as part of population enhancement and recovery programs. However, fish produced from the sterile hatchery environment often develop maladaptive behavioural phenotypes that can result in high post-release mortality. Lake Sturgeon (Acipenser fulvescens) are reared in hatcheries for conservation purposes, yet little is known of their early life behaviour. Here, I investigate the influence of body size on resource holding potential (RHP) and boldness, and the potential for predator conditioning to influence risk assessment and the physiology of juvenile Lake Sturgeon. Results indicate condition factor, rather than body size, increases RHP and bold responses in juvenile Lake Sturgeon. Additionally, conditioning did not influence risk assessment behaviour. However, foraging remained paramount, and chronic conditioning had an effect on whole body cortisol concentrations, suggesting a sensitive stress response. These results indicate the complex early life behaviour of juvenile Lake Sturgeon, both behaviourally and physiologically.
Author: J. Marty Holtgren
Publisher:
ISBN:
Category :
Languages : en
Pages :
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