Activity Localization in Coastal Cutthroat Trout (Salmo clarki clarki) in a Small Bog Lake

1974 ◽  
Vol 31 (7) ◽  
pp. 1246-1249 ◽  
Author(s):  
B. G. Shepherd
Keyword(s):  
Cutthroat Trout ◽  
Focal Points ◽  
Mark Recapture ◽  
Coastal Cutthroat Trout ◽  
Ultrasonic Tracking ◽  
Salmo Clarki

Skindiving observations, ultrasonic tracking, and mark–recapture techniques indicated that coastal cutthroat trout (Salmo clarki clarki) in a small coastal bog lake have, but do not defend, fixed focal points of activity.

Ultrasonic Tracking of Homing Cutthroat Trout (Salmo clarki) in Yellowstone Lake

1970 ◽  
Vol 27 (4) ◽  
pp. 715-730 ◽  
Author(s):  
James D. McCleave ◽  
Ross M. Horrall
Keyword(s):  
Cutthroat Trout ◽  
Open Water ◽  
Consistent Pattern ◽  
The Other ◽  
Yellowstone Lake ◽  
True Navigation ◽  
Ultrasonic Tracking ◽  
Spawning Tributaries ◽  
Salmo Clarki ◽  
Water Speed

Displacement of 42 mature cutthroat trout (Salmo clarki) from their spawning tributaries to the open water of Yellowstone Lake in the summers of 1966 and 1968 and following them ultrasonically up to 13.5 hr and 11.8 km indicated that those that homed used a compass mechanism rather than search or true navigation to find shore and then followed the shoreline to the home stream. Vision was unnecessary for homing. For many of the fish whose movements showed no consistent pattern, the transmitters failed prematurely.Of 29 nonanesthetized trout tracked from a point northwest of their home streams, six moved generally eastward to shallow water, turned south, and followed the shoreline toward the home streams, three being followed all the way home. Six moved generally south or southeast and progressed toward their home streams entirely in open water, one being followed home. Three moved inappropriately for homing but were less than 2 km from the release point when tracking was ended. Fourteen moved randomly or did not move enough or were not tracked long enough to establish a pattern.Of five anesthetized-blinded trout, two moved eastward and then south along the shoreline, one moved south in open water, and the other two did not show a consistent pattern. Of four anesthetized-control trout, two moved eastward and then south along shore, one being followed home; one moved inappropriately and the other did not establish a pattern.Of four nonanesthetized trout tracked from a point southwest of their home stream, three moved east and then north along shore toward the home stream, one being followed home; the fourth moved north in open water.Current directions may have influenced the initial orientations.Swimming speeds ranged from 0.0 to 46.2 cm sec−1 in open water and from 8.5 to 82.3 cm sec−1 along shore. Average along-shore speed (36.6 cm sec−1) was greater than average open-water speed (22.9 cm sec−1). Blinded trout swam at about the same speeds (average 22.6 cm sec−1) as control trout (average 27.0 cm sec−1) and nonanesthetized trout (average 23.3 cm sec−1).

Karyotypic and Evolutionary Relationships of the Yellowstone (Salmo clarki bouvieri) and West-Slope (S. c. lewisi) Cutthroat Trout

1979 ◽  
Vol 36 (6) ◽  
pp. 630-635 ◽  
Author(s):  
Eric J. Loudenslager ◽  
Gary H. Thorgaard
Keyword(s):  
Key Words ◽  
Great Basin ◽  
Cutthroat Trout ◽  
Rocky Mountain ◽  
Mountain Region ◽  
Evolutionary Relationships ◽  
Rocky Mountain Region ◽  
Coastal Cutthroat Trout ◽  
Yellowstone Cutthroat Trout ◽  
Salmo Clarki

Yellowstone cutthroat trout (Salmo clarki bouvieri) have 64 chromosomes, without any subtelocentric chromosomes, while west-slope cutthroat trout (S. c. lewisi) have 66 chromosomes, including 12 subtelocentrics. Both subspecies have 104 chromosome arms. Chromosomal similarities are apparent between the Yellowstone cutthroat and Great Basin cutthroat subspecies, and between west-slope cutthroat trout and coastal cutthroat trout. These results demonstrate that at least two distinct evolutionary lines of cutthroat trout are present in the northern Rocky Mountain region. Key words: Salmo clarki, karyotypes, Yellowstone cutthroat trout, west-slope cutthroat trout, evolutionary relationships

The Relation between Scale Diameter and Body Length of Kamloops Trout, Salmo gairdneri kamloops

1955 ◽  
Vol 12 (5) ◽  
pp. 742-753 ◽  
Author(s):  
S. B. Smith
Keyword(s):  
Fork Length ◽  
Cutthroat Trout ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Double Logarithmic Plot ◽  
Relative Growth ◽  
Coastal Cutthroat Trout ◽  
Constant Slope ◽  
Salmo Clarki ◽  
Simple Proportion

The scale/body relationship for Kamloops trout is very close to direct proportion for fish larger than 4.5 cm. fork length. The resultant plot on a double logarithmic grid is linear with a slope not significantly different from 1.00 (45°). Calculations of lengths of trout from scales at ages previous to that of capture can be made on the basis of simple proportion in two ways, (1) by use of a constant slope (45°) on a double logarithmic plot, or (2) by use of a constant zero-zero intercept on an arithmetic plot.Growth of the scales of the young is characterized by relatively rapid increase from time of scale formation, 3.5 cm. fork length up to 4.5 cm. At about 4.5 cm. fork length there is a sharp break (inflection) in the relative growth curve toward isometric growth of scales and body. Reliable estimates of the length of trout may be obtained from scales alone, using the diameter of the first circulus of the scale, the slopes and inflection of the relative scale/body plot and total diameter of the scale at time of capture.Marked Kamloops trout of known size were released in 1953. Subsequent recaptures both in 1953 and 1954 substantiated the accuracy of the method of estimating lengths of trout at ages previous to that of capture.Observations on the steelhead trout, Salmo gairdneri gairdneri, and on the coastal cutthroat trout, Salmo clarki clarki, suggest that an isometric scale/body relationship may exist among those species also.

Genetic Structure of Anadromous Cutthroat Trout (Salmo clarki clarki) Populations in the Puget Sound Area: Evidence for Restricted Gene Flow

1987 ◽  
Vol 44 (3) ◽  
pp. 573-582 ◽  
Author(s):  
Donald E. Campton ◽  
Fred M. Utter
Keyword(s):  
Gene Flow ◽  
Gene Diversity ◽  
Genetic Relationships ◽  
Puget Sound ◽  
Cutthroat Trout ◽  
Restricted Gene Flow ◽  
Pleistocene Glaciation ◽  
Expected Heterozygosity ◽  
Coastal Cutthroat Trout ◽  
Salmo Clarki

Genetic relationships among anadromous populations of coastal cutthroat trout (Salmo clarki clarki) in the Puget Sound area (United States) were investigated by electrophoretic methods between successive year classes within streams (populations), among streams within drainages, between drainages within each of two regions separated by Puget Sound, and between the two regions. Average allele frequencies for fish from the two regions differed by approximately 0.10 at several polymorphic loci, suggesting that gene flow between the two regions is restricted. Despite this divergence, the sampled populations were all very similar genetically (Nei's I > 0.97), possibly reflecting a common ancestral invasion following Pleistocene glaciation. The total gene diversity (expected heterozygosity) was 0.101 and was partitioned as follows: between regions, 1.24%; between drainages, 1.01%; among streams, 2.41%; between year classes, 1.17%; within individual year class samples, 94.2%. In addition, stream effects were significant in 7 of 12 intralocus ANOVA comparisons, suggesting that populations were structured genetically at this level of subdivision. This latter result may be reflecting the homing instinct of spawning adults.

Scale Characteristics of Yearling Coastal Cutthroat and Steelhead Trout

1957 ◽  
Vol 14 (2) ◽  
pp. 203-212 ◽  
Author(s):  
E. H. Vernon ◽  
R. G. McMynn
Keyword(s):  
Fork Length ◽  
Cutthroat Trout ◽  
Salmo Gairdneri ◽  
Steelhead Trout ◽  
Scale Growth ◽  
Scale Size ◽  
Species Overlap ◽  
Coastal Cutthroat Trout ◽  
Scale Characteristics ◽  
Salmo Clarki

Some scale characteristics of 88 yearling coastal cutthroat trout (Salmo clarki clarki) and 96 yearling steelhead (Salmo gairdneri) were compared in some detail. Although the number of diagonal scale rows above the lateral line was significantly higher in cutthroat, the counts of the two species overlap. The correlation of scale circuli counts with scale diameter was 0.94 for steelhead and 0.90 for cutthroat. At any given scale size cutthroat had 8 per cent more circuli than steelhead scales. Measurements of lateral and longitudinal diameters and anterior radii of scales show that the anterior portions of cutthroat scales tend to be longer and narrower than those of steelhead.Regression analyses of each scale measurement on fork length indicated that, for any given fork length, cutthroat scales are smaller than those of steelhead; the greatest difference being apparent when anterior radii are compared. Growth of scales in a dorsoventral plane approximates isauxesis in relation to fork length but scale growth in a longitudinal plane tends toward positive heterauxesis which is particularly pronounced in the anterior portions of scales.Multiple regression analyses of scale diameter, scale row count and fork length indicated that the smaller size of cutthroat scales is not balanced by proportionate increase in their number. When scale diameter is adjusted for scale number and fork length, cutthroat scales are 15.6 per cent smaller than those of steelhead, indicating that young cutthroat are covered by their scales with less overlap.

EFFECT OF VARIOUS HORMONES ON THE KIDNEY RESPIRATION RATES IN THE CUTTHROAT TROUT (SALMO CLARKI CLARKI)

1960 ◽  
Vol XXXIII (III) ◽  
pp. 428-436 ◽  
Author(s):  
W. N. Holmes
Keyword(s):  
Single Dose ◽  
Respiration Rate ◽  
Cutthroat Trout ◽  
Adaptive Mechanism ◽  
Respiration Rates ◽  
Salmo Clarki

ABSTRACT Relatively large doses of vasopressin administered intraperitoneally to the trout significantly enhanced the kidney respiration rate. In contrast to vasopressin a single dose of oxytocin depressed the kidney Qo2 value. This depression continued throughout the observed 24 hour period after injection. Cortisol enhanced the kidney Qo2 values significantly and to a greater extent than vasopressin. These results are discussed in relation to possible adaptive mechanism in euryhaline species of teleosts.

scholarly journals Evaluating Coexistence of Fish Species with Coastal Cutthroat Trout in Low Order Streams of Western Oregon and Washington, USA

Fishes ◽  
2021 ◽  
Vol 6 (1) ◽  
pp. 4
Author(s):  
Kyle D. Martens ◽  
Jason Dunham
Keyword(s):  
Pacific Northwest ◽  
Species Interactions ◽  
Coho Salmon ◽  
Cutthroat Trout ◽  
Single Species ◽  
The Pacific ◽  
Small Streams ◽  
Coastal Cutthroat Trout ◽  
Multiple Species ◽  
Low Order

When multiple species of fish coexist there are a host of potential ways through which they may interact, yet there is often a strong focus on studies of single species without considering these interactions. For example, many studies of forestry–stream interactions in the Pacific Northwest have focused solely on the most prevalent species: Coastal cutthroat trout. To examine the potential for interactions of other fishes with coastal cutthroat trout, we conducted an analysis of 281 sites in low order streams located on Washington’s Olympic Peninsula and along the central Oregon coast. Coastal cutthroat trout and juvenile coho salmon were the most commonly found salmonid species within these streams and exhibited positive associations with each other for both presence and density. Steelhead were negatively associated with the presence of coastal cutthroat trout as well as with coho salmon and sculpins (Cottidae). Coastal cutthroat trout most frequently shared streams with juvenile coho salmon. For densities of these co-occurring species, associations between these two species were relatively weak compared to the strong influences of physical stream conditions (size and gradient), suggesting that physical conditions may have more of an influence on density than species interactions. Collectively, our analysis, along with a review of findings from prior field and laboratory studies, suggests that the net effect of interactions between coastal cutthroat trout and coho salmon do not appear to inhibit their presence or densities in small streams along the Pacific Northwest.

Sign in / Sign up

Export Citation Format

Share Document