Survival and Growth of Rainbow Trout (Salmo gairdneri) in Four Prairie Lakes, North Dakota

1976 ◽  
Vol 33 (5) ◽  
pp. 1192-1195 ◽  
Author(s):  
Gary L. Myers ◽  
John J. Peterka
Keyword(s):  
Rainbow Trout ◽  
North Dakota ◽  
Survival Rates ◽  
Salmo Gairdneri ◽  
Blue Green Algae ◽  
Commercial Use ◽  
Algae Blooms ◽  
Prairie Lakes ◽  
Survival And Growth ◽  
Predatory Birds

Survival of rainbow trout (Salmo gairdneri) in three North Dakota prairie lakes was low the 1st mo after stocking, ranging from 15 to 54%; high mortality may have been due to bird predation. In a fourth lake, where 77% survived the 1st mo, no predatory birds were observed. All fish in two lakes died in August when dissolved oxygen levels dropped to below 1.0 mg/liter following July blue-green algae blooms of 28 and 63 mm3/liter. In the other two lakes, harvests in October ranged from 0.1 to 4.4% of fish stocked. Mean wet weights at harvest of up to 272 g were sufficient for commercial use; however, special management to improve survival rates would be necessary in the lakes studied.

Biological and Toxicologtcal Effects of Environmental Contaminants in Fish and Their Eggs

1983 ◽  
Vol 40 (3) ◽  
pp. 306-312 ◽  
Author(s):  
A. J. Niimi
Keyword(s):  
Rainbow Trout ◽  
Organic Contaminants ◽  
Yellow Perch ◽  
Survival Rates ◽  
Lake Ontario ◽  
Smallmouth Bass ◽  
Salmo Gairdneri ◽  
White Bass ◽  
Morone Chrysops ◽  
Contaminant Transfer

Rainbow trout (Salmo gairdneri), white sucker (Catostomus commersoni), white bass (Morone chrysops), smallmouth bass (Micropterus dolomieui), and yellow perch (Perca flavescens) were collected from Lakes Ontario and Erie to examine the relationship between contaminant levels in females and their eggs. Factors such as the percent lipid in the fish and percent of total lipid deposited in the eggs significantly influenced (P < 0.01) contaminant transfer. The percentages of the 9–11 organic contaminants transferred generally showed less variation within a species than the percentages for a substance transferred among the five species examined. This relationship was consistent even though there was over a 10-fold range in contaminant concentrations within a given species. Mercury did not demonstrate this response because the percentage in eggs was low for all species. The levels of PCB monitored in eggs of rainbow trout collected from Lake Ontario suggest that egg and fry survival rates could be affected based on the toxicological evidence from other studies. An examination of the possible effects of spawning on the kinetics of contaminants among these species suggests that relative body concentrations of organic contaminants may be decreased by 5% or be increased by 10%, and mercury levels may be increased by 6–22% following the deposition of eggs. The amount of change varies with species and is influenced by the percent egg weight of body weight, and the rate of contaminant transfer from females to eggs.Key words: toxicology, contaminants, reproduction, Lake Ontario, Lake Erie

Effect of Smoke-Processing on Muddy Odor and Taste in Rainbow Trout (Salmo gairdneri)

1972 ◽  
Vol 29 (9) ◽  
pp. 1365-1366 ◽  
Author(s):  
D. G. Iredale ◽  
D. Rigby
Keyword(s):  
Rainbow Trout ◽  
Salmo Gairdneri ◽  
Production Potential ◽  
Valid Method ◽  
Central Canada ◽  
Full Production ◽  
Prairie Lakes

Because of problems with a "muddy" odor and taste occurring in rainbow trout being reared commercially in some small prairie lakes in central Canada, full production potential has not been realized. The possibility of masking the undesirable condition by smoke-processing was investigated and this was found to be a valid method of utilizing the majority of the affected fish.

Response of Wild Rainbow (Salmo gairdneri) and Cutthroat Trout (S. clarki) to Stocked Rainbow Trout in Fertile and infertile Streams

1988 ◽  
Vol 45 (12) ◽  
pp. 2087-2105 ◽  
Author(s):  
C E. Petrosky ◽  
T. C. Bjornn
Keyword(s):  
Rainbow Trout ◽  
Mortality Rate ◽  
Survival Rates ◽  
Cutthroat Trout ◽  
The Other ◽  
Salmo Gairdneri ◽  
Summer Mortality ◽  
Wild Trout ◽  
Stocking Rates

Wild rainbow trout (Salmo gairdneri) and cutthroat trout (S. clarki) were unaffected by stocking of catchable-size rainbow trout in two Idaho streams, except at the highest stocking rates, and even then the effects were limited. In the infertile stream, stocking 50 or 150 trout per section (doubling or tripling the density) did not reduce the abundance of wild cutthroat trout. Wild trout abundance declined at a faster rate in an unreplicated section stocked with 500 trout than in unstocked sections. In the fertile stream, stocking 50 or 100 hatchery trout in sections containing 26–120 similar-sized wild trout did not increase the dispersion or reduce the abundance, growth, or survival rates of wild rainbow trout. When we stocked 400 trout (100 on four dates) in sections containing 32–53 tagged wild trout of similar size, the summer mortality rate of wild trout was higher in stocked than in unstocked sections; the other parameters were not significantly different.

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