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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...
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This report describes an electronic database containing 474 annotated citations that are relevant to fish passage through dams in large temperate floodplain rivers. Our goal was to survey the literature to help define the potential ecological consequences of restricted fish passage through dams in the Upper Mississippi River System and to identify alternative engineering solutions for increasing fish passage in large temperate floodplain rivers. Consequently, topic coverage is broad, including theoretical concepts in large river ecology, engineering design of fish passage structures, ecological responses to river impoundment, fish swimming performance, and relations between freshwater mussels and fish.
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Resource managers are currently using reductions in the Upper Mississippi River’s (UMR) water levels during summer to mimic historical water levels and rehabilitate habitats for vegetation and desirable fauna. However, drawdowns may have adverse effects on native mussel populations. Over the past few years, systematic, pool-wide surveys of mussels in Pools 5, 6, and 18 have been conducted. The objective of this study was to characterize the effects of water level drawdown on the mortality, movement, and behavior of a common Lampsilini species, Lampsilis cardium, and a common Amblemini species, Amblema plicata, in Pool 6 of the UMR during 2009 and 2010. About 460 mussels were tagged and followed about weekly during...
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Proposed invasive carp barriers may threaten populations of migratory fishes in the St. Croix National Scenic Riverway and the Mississippi National River and Recreation Area by preventing movements between rivers needed to fulfill life history requirements. Moreover, reproducing populations of invasive carp could alter aquatic food webs and negatively affect mussels and migratory fishes. In this study, nonlethal chemical techniques were used to determine the trophic positions and migratory histories of lake sturgeon (Acipenser fulvescens) captured in the St. Croix and Mississippi rivers. Stable isotope analyses demonstrated differences in trophic position among sturgeon captured in different locations among the...
Categories: Data;
Tags: Aquatic Biology,
Environmental Health,
Lake sturgeon,
Mississippi National River and Recreation Area (MISS),
Sr:Ca, All tags...
St. Croix National Scenic Riverway (SACN),
USGS Science Data Catalog (SDC),
age,
biota,
fatty acid,
migratory history,
none,
pectoral fin ray,
stable isotope,
trace metals, Fewer tags
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A pilot study was conducted to evaluate ichthyoplankton communities among selected habitats in the upper Mississippi River. Catch data were used to compare differences in catch among habitat types and to relate these differences to water quality. Sampling design characteristics to describe spatial and temporal differences in the ichthyoplankton community were recommended. Samples were collected by LTRM field station personnel in Pools 8, 13, and 26 of the upper Mississippi River and in the lower section of the Illinois River. About 30% of the samples processed had some sort of collection or recording error. Suggestions were presented to reduce collection and recording errors. Catches in main channel habitats were...
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