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• W2313758818 abstract "Correlations were determined between growth/body condition of centrarchids age 0+ to 1+ and abundance of specific taxa of zooplankton in the littoral zone of three lakes in piedmont North Carolina over a period of eight months. Stomach analyses were conducted, and electivity indices calculated to provide comparative data. Significant differences were found in body condition, growth rate, and zooplankton abundance between lakes (P < 0.05, ANOVA). First year growth and changes in body condition of age 0+ Lepomis, Pomoxis and Micropterus species were positively correlated with the abundance of copepod nauplii and copepodids in each lake (mean rs = 0.898, P < 0.01). The abundance of adult copepods was also frequently correlated with growth and body condition, but at a lower level of probability (mean rs = 0.713, P < 0.05). The number of significant correlations dropped sharply as fish age increased to 1+ years. Significant associations could not be generated using data for Rotifera, Protozoa or Ostracoda, and were quite infrequent for Cladocera. The correlations suggest that copepod nauplii and copepodids are primary food during the critical period when larval centrarchids switch from endogenous to exogenous nutrition. The correlation data were supported by stomach analyses and electivity indices which indicated 0+ fishes to be mainly utilizing copepods, supplemented with cladocerans, insect larvae, and fishes in the more piscivorous species. The mean prey size for larval bluegill and largemouth bass (15 mm total length) was found to be 0.48 mouth gape and 0.60 mouth gape respectively, which translates to prey sizes of 0.11 mm to 0.35 mm during the larval stage. Due to mouth size during the period of first feeding, most adult copepods and cladocerans are too large to be ingested even if prey could be handled with dimensions approaching 0.99 mouth gape. The relative insignificance of Cladocera in the diet of post-larval fishes appears to be due to negative selection rather than to influences of seasonal abundance or encounter probability. It is evident that in these North Carolina lakes, cladocerans are not so universally important in the diet of age 0+ centrarchids as studies on northern and midwestern lakes would indicate. Correlations, stomach analyses, and electivity indices can be integrated into a multiple factor approach to diet studies, allowing consideration of several environmental and population variables and yielding more meaningful results than by using one method alone. Potential impacts of aquatic pollution on food organisms required during the first weeks of feeding should place additional priority on diet studies and ecological relationships between centrarchids and the littoral zone." @default.
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• W2313758818 date "1982-05-28" @default.
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• W2313758818 title "Growth of Young-of-the-Year and Yearling Centrarchids in Relation to Zooplankton in the Littoral Zone of Lakes" @default.
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• W2313758818 doi "https://doi.org/10.2307/1444609" @default.
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