Possible Adaptive Significance of Certain Enzyme Polymorphisms in Steelhead Trout (Salmo gairdneri)

1979 ◽  
Vol 36 (5) ◽  
pp. 544-551 ◽  
Author(s):  
J. M. Redding ◽  
C. B. Schreck
Keyword(s):  
High Temperature ◽  
Lactate Dehydrogenase ◽  
Dissolved Oxygen ◽  
Isocitrate Dehydrogenase ◽  
Adaptive Significance ◽  
Salmo Gairdneri ◽  
Parental Effects ◽  
Steelhead Trout ◽  
Intrinsic Properties ◽  
Juvenile Trout

In experimentally reared winter steelhead trout (Salmo gairdneri) fry, mean weights, lengths, and condition factors of three isozyme phenotypes of lactate dehydrogenase (LDH) enzyme differed significantly. Time of emergence from the gravel was unrelated to LDH phenotype. Relative mortality of the phenotypes between eyed-egg stage and emergence was unaffected by different subgravel conditions of temperature and dissolved oxygen. Differential tolerance to acute challenges of high temperature and low dissolved oxygen was observed between phenotypes of isocitrate dehydrogenase (IDH) enzyme and LDH in juvenile trout. Parental effects may have biased the result for LDH. Differences between IDH phenotypes may be related to intrinsic properties of variant isozymes. Key words: isozymes, lactate dehydrogenase, isocitrate dehydrogenase, temperature, dissolved oxygen, adaptive significance, Salmo gairdneri

Swimming Stamina Differences Between Genotypically Distinct Forms of Rainbow (Salmo gairdneri) and Steelhead Trout

1977 ◽  
Vol 34 (7) ◽  
pp. 996-1003 ◽  
Author(s):  
H. Tsuyuki ◽  
S. N. Williscroft
Keyword(s):  
Rainbow Trout ◽  
Lactate Dehydrogenase ◽  
Key Words ◽  
Low Frequency ◽  
Water Velocity ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Very Low Frequency ◽  
Time Required

Rainbow trout (Salmo gairdneri) homozygous for liver lactate dehydrogenase alleles ldhHαA and ldhHαB were artificially propagated and their swimming stamina compared. The time required to fatigue 50% of the HαAHαA phenotypes in fixed water velocity tests was 2.3 times greater on the average than that of HαAHαB phenotypes.Likewise, LDH phenotypes HαAHαA, HαAHαB, and HαAHαB of steelhead trout from the Thompson River were artifically propagated and their swimming stamina compared. In contrast to the rainbow trout, significant differences in stamina among the three phenotypes of steelhead were not evident in the stocks from this river nor between phenotypes HαAHαB and HαBHαB from another stream, the Vedder River, which has a very low frequency of the ldhHαA allele. The stamina of young steelhead from the Thompson River was, however, 3.8 times greater than that of those from the Vedder River. Key words: stamina, LDH, rainbow trout, steelhead, phenotype, swimming, fatigue

Distribution of LDH-B″ Gene in Resident and Anadromous Rainbow Trout (Salmo gairdneri) from Streams in British Columbia

1974 ◽  
Vol 31 (1) ◽  
pp. 106-108 ◽  
Author(s):  
L. Huzyk ◽  
H. Tsuyuki
Keyword(s):  
Rainbow Trout ◽  
Lactate Dehydrogenase ◽  
Low Frequency ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Wild Populations ◽  
Very Low Frequency ◽  
B Subunit ◽  
Coastal Streams ◽  
Skeena River

The B″ subunit of lactate dehydrogenase from the liver tissue of wild populations of resident rainbow trout (Salmo gairdneri) from the Loon and Pennask Lake areas has been found in a frequency of 0.400–0.800. An electrophoretically identical subunit was found in similar proportions in anadromous steelhead trout from the Thompson River, and from the Coquihala River in considerably smaller proportions. Steelhead from some coastal streams in and near Vancouver and Vancouver Island, and other selected streams from the Fraser and Skeena river systems generally revealed a very low frequency of less than 0.1.

Changes in Blood Chemistry of Juvenile Steelhead Trout, Salmo gairdneri, Following Sublethal Exposure to Nitrogen Supersaturation

1974 ◽  
Vol 31 (12) ◽  
pp. 1953-1957 ◽  
Author(s):  
T. W. Newcomb
Keyword(s):  
Alkaline Phosphatase ◽  
Uric Acid ◽  
Lactate Dehydrogenase ◽  
Total Protein ◽  
Total Bilirubin ◽  
Blood Chemistry ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Serum Samples ◽  
Serum Glutamic Oxalacetic Transaminase

Groups of juvenile steelhead trout (Salmo gairdneri) were exposed for 35 days to various (103, 105, 110, and 116%) sublethal nitrogen plus argon saturations. Pooled serum samples were analyzed for Ca, Na, PO4, K, Cl, albumin, total protein, cholesterol, alkaline phosphatase, glucose, urea, uric acid, total bilirubin, lactate dehydrogenase, and serum glutamic oxalacetic transaminase. An increase in serum potassium and phosphate, and a decline in serum albumin, calcium, cholesterol, total protein and alkaline phosphatase were noted in steelhead exposed to 116% nitrogen (N2 + Ar) saturation (total atmospheric gas saturation 110%). No major changes in blood chemistry were observed at nitrogen saturations of 110% or less.

Patterns of Aggressive Attack in Juvenile Steelhead Trout (Salmo gairdneri)

1985 ◽  
Vol 42 (11) ◽  
pp. 1702-1706 ◽  
Author(s):  
Jeremy C. Abbott ◽  
Lawrence M. Dill
Keyword(s):  
Central Body ◽  
The Body ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Caudal Fin ◽  
Dorsal Fin ◽  
Body Patterns ◽  
Aggressive Attack ◽  
Juvenile Trout ◽  
Body Section

Nipping is a potentially damaging aggressive behavior of juvenile steelhead trout (Salmo gairdneri). By analyzing videotaped interactions of pairs of fish we determined where nips were aimed and where they contacted the opponent's body. Patterns of fin damage were also assessed. Aims and nips (contacts) were distributed differently in reciprocal and nonreciprocal aggressive bouts. In nonreciprocal bouts, aims were directed mainly at the dorsal fin, central body section, and caudal fin. Nip contact was biased towards the caudal fin. In reciprocal bouts, both aims and nips were concentrated on the dorsal fin and anterior portions of the body. We suggest that juvenile steelhead adjust their fighting tactics in response to opponent behavior. Mouth fighting, a novel behavior in juvenile trout, was observed in some reciprocal bouts. The dorsal fin incurred the greatest damage. We conclude that aggression (nipping) is responsible for the dorsal fin damage commonly observed in hatchery-reared salmonids.

The regulation of day–night changes in hydroxyindole-O-methyltransferase activity in the pineal gland of steelhead trout (Salmo gairdneri)

1976 ◽  
Vol 54 (9) ◽  
pp. 1530-1534 ◽  
Author(s):  
John R. Smith ◽  
Lavern J. Weber
Keyword(s):  
Pineal Gland ◽  
Sharp Increase ◽  
Pineal Region ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Methyltransferase Activity ◽  
Surgical Exposure

Elevation in pineal hydroxyindole-O-methyltransferase (HIOMT; EC 2.1.1.4) activity in juvenile steelhead trout was associated with the dark portions of three different photoperiods with a sharp increase in pineal HIOMT activity occurring in the first 4 h of darkness. This pattern of activity could be abolished by bilateral enucleation but not by surgical capping of the pineal region. Surgical exposure of the pineal region in blinded fish did not restore HIOMT responses to changes in lighting.

Growth hormone response to sustained swimming in exercise-acclimated steelhead trout, Salmo gairdneri

1988 ◽  
Vol 32 (5) ◽  
pp. 799-800 ◽  
Author(s):  
B. A. Barrett ◽  
B. A. McKeown
Keyword(s):  
Growth Hormone ◽  
Growth Hormone Response ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Hormone Response

Movements of Rainbow Steelhead Trout (Salmo Gairdneri) in Lake Ontario and a Hypothesis for the Influence of Spring Thermal Structure

1986 ◽  
Vol 12 (4) ◽  
pp. 304-313 ◽  
Author(s):  
James M. Haynes ◽  
David C. Nettles ◽  
Kevin M. Parnell ◽  
Michael P. Voiland ◽  
Robert A. Olson ◽  
...  
Keyword(s):  
Thermal Structure ◽  
Lake Ontario ◽  
Salmo Gairdneri ◽  
Steelhead Trout
Sign in / Sign up

Export Citation Format

Share Document