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  • 1
    ISSN: 1749-7345
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Agriculture, Forestry, Horticulture, Fishery, Domestic Science, Nutrition
    Notes: Maximum handling sizes, prey size and species preferences, and ad libitum consumption rates were determined for three size classes of redear sunfish Lepomis microlophus feeding on Physa gyrina and Helisoma trivolvis, two common aquaculture-pond snails which serve as intermediate hosts for fish parasites. Maximum handling-size experiments indicated that redear sunfish as small as 14-cm total length were capable of consuming all sizes of Physa typically observed in ponds, whereas only redear sunfish of at least 32-cm total length are capable of consuming all commonly observed sizes of pond-dwelling Helisoma. When presented with a range of sizes of both snail species, redear sunfish consumed higher proportions of smaller- and medium-sized snails; the largest snails offered were uneaten or consumed in relatively small quantities. Multiple linear regression was applied to consumption data to develop a simple model for predicting mean daily ad libitum consumption rate (g/g per d) for redear sunfish feeding on snails with temperature (20–27 C) and fish total length (9–24 cm) as independent variables. Our findings will facilitate prediction of numbers of redear sunfish of a given size required to control populations of Physa and Helisoma in ponds. Such predictions will enable pond owners to quickly evaluate whether stocking redear sunfish as a control agent for undesirable snail populations will be economically and logistically feasible. Findings also indicate potential limitations in the use of redear sunfish to control populations of Helisoma due to the inability of redear sunfish as large as 24-cm total length to consume the largest 30–40% of Helisoma commonly observed in ponds and to the expense of stocking larger fish (32-cm total length) capable of consuming all sizes of Helisoma.
    Type of Medium: Electronic Resource
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Hydrobiologia 437 (2000), S. 165-170 
    ISSN: 1573-5117
    Keywords: primary production ; respiration ; periphyton ; in situ ; Missouri
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Benthic community metabolism was measured in three habitats (riffles, runs and pools) during spring (May), summer (July) and fall (October) in the Jacks Fork River, Missouri, using an in situ chamber technique. Net community productivity (NCP) and gross community productivity (GCP) were highest in riffles, lowest in pools and intermediate in runs. Rates of NCP and GCP during spring and fall were similar for both riffles and runs, but NCP and GCP increased significantly during summer in both habitats. Pool substrates were always heterotrophic and exhibited no significant seasonal changes in NCP or GCP. Community respiration (CR) was highest in riffles, intermediate in runs and lowest in pools, but interhabitat differences in CR were generally smaller than for NCP. Rates of CR during spring and fall were similar, but CR increased significantly during summer. Results indicate that the physical conditions associated with each habitat strongly affect benthic community metabolism in this stream and that the relative proportions of these habitats will influence the ratio of living algal:detrital organic matter potentially available for consumers.
    Type of Medium: Electronic Resource
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