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: Herman O. Sanders
Publisher:
ISBN:
Category : Aquatic invertebrates
Languages : en
Pages : 12
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Book Description
Application of the organophosphate insecticide Abate three times (at about monthly intervals) to duplicate 0.04 ha earthen ponds at 18 g/ha (4 micrograms/liter) -- the recommended application rate -- and 180 g/ha (40 micrograms/liter) caused no mortality on blugills. In ponds treated with 18 g/ha fewer bluegill fry were produced than in control ponds, brain acetylcholinesterase (AChE) activity was not affected, and accelerated growth of both fry and adults appeared to result from heavy feeding on dead or moribund Diptera larvae that resulted from the first two applications of Abate. The routine use of Abate at the recommended rate should have little adverse effect on fishery resources.
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 : 566
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Book Description
Author:
Publisher:
ISBN:
Category : Government publications
Languages : en
Pages : 748
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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.
