Ecology of Larval Fishes in Lake Oahe, South Dakota PDF Download
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Author: William Roland Nelson
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 24
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Book Description
The time and location of spawning, food and larvae, and habitats used as nursery areas by young-of-the-year fishes were studied from 1972 to 1975 in South Dakota waters of Lake Oahe, a main stem Missouri River reservoir. Sampling locations were in the tributary rivres -- the Grand Moreau, and Cheyenne -- and their embayments. Year-class strength of river-spawning species was strongly correlated with river flow rates during the spawning season. Success of reservoir-spawning species was primarily dependent on above-average water levels, which inundated terrestrial vegetation to provide a substrate for egg deposition and cover for larvae. Preserving adequate streamflow and enhancing reservoir shoreline areas by managing water levels, seeding vegetation, and eliminating grazing alongshore would probably ensure adequate reproduction of most areas.
Author: William Roland Nelson
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 24
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Book Description
The time and location of spawning, food and larvae, and habitats used as nursery areas by young-of-the-year fishes were studied from 1972 to 1975 in South Dakota waters of Lake Oahe, a main stem Missouri River reservoir. Sampling locations were in the tributary rivres -- the Grand Moreau, and Cheyenne -- and their embayments. Year-class strength of river-spawning species was strongly correlated with river flow rates during the spawning season. Success of reservoir-spawning species was primarily dependent on above-average water levels, which inundated terrestrial vegetation to provide a substrate for egg deposition and cover for larvae. Preserving adequate streamflow and enhancing reservoir shoreline areas by managing water levels, seeding vegetation, and eliminating grazing alongshore would probably ensure adequate reproduction of most areas.
Author:
Publisher:
ISBN:
Category : Fish culture
Languages : en
Pages : 206
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Book Description
Author: Robert Wallus
Publisher:
ISBN:
Category : Fishes
Languages : en
Pages : 304
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Book Description
Author:
Publisher:
ISBN:
Category : Hydrology
Languages : en
Pages : 1162
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Book Description
Author: U.S. Fish and Wildlife Service
Publisher:
ISBN:
Category : Animals
Languages : en
Pages : 56
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 836
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 566
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Book Description
Author:
Publisher:
ISBN:
Category : Fisheries
Languages : en
Pages : 214
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Book Description
Report on activities in the divisions of research.
Author: Herman O. Sanders
Publisher:
ISBN:
Category : Acute toxicity testing
Languages : en
Pages : 12
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Book Description
Technical grade and field formulations of six experimental forest insecticides -- methomyl, carbaryl, aminocarb, trichlorfon, fenitrothion, and acephate -- were tested for acut toxicity against three species of aquatic invertebrates, (a daphnid, an amphipod, and larvae of a midge), and four species of fish (bluegill, rainbow trout, fathead minnow, channel catfish). Five of the six insecticides were highly toxic or extremely toxic to the daphnid, amphipod, and midge larvae. The sixth insecticide, acephate, was not toxic to invertebrates at concentrations up to 50 mg/L. Five of the insecticides ranged from highly toxic (methomyl to channel catfish) to relatively non-toxic (trichlorfon to fathead minnows); the sixth, acephate, was only slightly toxic to the fishes tested.
Author: George Alan Kelly
Publisher:
ISBN:
Category : Animal introduction
Languages : en
Pages : 16
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Book Description
Significant changes have occurred in the distribution of trout in streams of Great Smoky Mountains National Park since 1900. By the mid-1970's the original range of the native brook trout had been reduced by about 70% and the species was relegated to suboptimal habitat in head water streams. Most of the stream sections lost by brook trout became the territory of the introduced rainbow trout, which in 1977 occupied about 80% of the Park waters. After 1950, brown trout introduced in State waters outside the Park established reproducing populations in some 50 miles of stream formerly occupied only by rainbow trout. If current trends continue, the recovery of brook trout in Park water may be difficult, if not impossible, and brown trout may occupy much of the territory now held by rainbow trout.
