Jennings, C.A.

2 items:

Mortality rates of early developmental stages of freshwater drum and sunfish in the Upper Mississippi River System Larval fish were sampled with plankton nets at two backwater and two main channel stations in Pool 8 in 1990, and at one main channel and one backwater station in Pools 8 and 14 in 1989 (four stations each year). Growth of sunfish (Lepomis spp.) and freshwater drum (Aplodinotus grunniens) was estimated with a length-based method and an otolith-based method. For each method, instantaneous mortality was estimated by regressing the natural logarithm of fish catch for each 1-mm size group against the group's estimated age. For freshwater drum, length-based and otolith-based estimates of mortality were similar at three of four main channel stations. However, for larval sunfish, the otolith-based method provided more... Categories: Publication; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service
Factors limiting the distribution of larval and juvenile fishes in vegetated habitats of the Upper Mississippi River We studied the use that young fishes make of vegetated and nonvegetated habitats in Lawrence Lake (Pool 8, Upper Mississippi River). Habitat use was both extensive and variable. Fish were found in all portions of the macrophyte beds. Backwater macrophyte beds both near to and distant from the main channel of the Mississippi River displayed similar patterns of habitat use. The open water site was used principally by gizzard shad and unidentified Cyprinidae. Habitat use in macrophyte beds with differing vegetation densities in Lawrence Lake was probably influenced by multiple factors. Physical and chemical microhabitat data explained little of the variation in catch in light traps. Two-stage sampling analyses indicated... Categories: Publication; Types: Map Service, OGC WFS Layer, OGC WMS Layer, OGC WMS Service

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