Preferred Temperatures of F3 to F5 Hybrids of Salvelinus fontinalis × S. namaycush

1976 ◽  
Vol 33 (2) ◽  
pp. 197-202 ◽  
Author(s):  
C. I. Goddard ◽  
J. S. Tait
Keyword(s):  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Acclimation Temperature ◽  
Generation Number ◽  
Preferred Temperatures

Preferred temperatures were determined for samples of four generations, F3, F4, "F4.5" (F4 × F3), and F5 of yearling splake (Salvelinus fontinalis × S. namaycush), acclimated 4, 8, 12, 16, and 20 C. Final preferenda for the four generations were 16.3, 15.9, 15.7, and 14.8 C, respectively, decreasing as generation number increased. Although these values are close to the 16 C preferendum of S. fontinalis, they show a trend towards the lake trout preferendum of 11.7 C. The hybrids are like S. namaycush in having preferred temperatures that are virtually unaffected by changes in acclimation temperature or season.

Preferred Temperature of Yearling Lake Trout, Salvelinus namaycush

1970 ◽  
Vol 27 (10) ◽  
pp. 1729-1733 ◽  
Author(s):  
R. W. McCauley ◽  
J. S. Tait
Keyword(s):  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Acclimation Temperature ◽  
Preferred Temperature ◽  
Stratified Lakes ◽  
Preferred Temperatures

Preferred temperatures were determined for yearling lake trout acclimated to 5, 10, 15, and 20 C. Acclimation temperature had virtually no effect on preferred temperature. The final preferendum was 11.7 C, which is about 2 degrees C warmer than the temperature at which lake trout are most commonly caught in thermally stratified lakes.

Seasonal Fluctuations in the Selected Temperature of Speckled Trout, Salvelinus fontinalis (Mitchill)

1953 ◽  
Vol 10 (4) ◽  
pp. 187-195 ◽  
Author(s):  
Charlotte M. Sullivan ◽  
Kenneth C. Fisher
Keyword(s):  
Seasonal Change ◽  
Salvelinus Fontinalis ◽  
Acclimation Temperature ◽  
Horizontal Gradient ◽  
Seasonal Fluctuations

The selected temperature of two- to three-inch trout (Salvelinus fontinalis, Mitchill) was determined in a horizontal gradient a number of times during the months of November, December, January, February and March. The data, which were collected over four years, indicated that during the early part of winter (November, December and January), there was a fall of the selected temperature which paralleled in a general way a gradual fall of the acclimation temperature. The consistency of this parallelism was so poor, however, as to suggest that at least part of the change in selected temperature was relatively independent of the change in acclimation temperature. During the later part of the winter (February and March) there was a rise of the selected temperature which occurred regularly, regardless of whether the acclimation temperature rose, fell or remained constant. It is concluded that there was, for these animals, a seasonal change of the selected temperature which was distinct from the changes in selected temperature brought about by changes of the acclimation temperature.

Fecundity and Egg Size of a Brood Stock of Salvelinus fontinalis × S. namaycush Hybrids (Splake)

1974 ◽  
Vol 31 (2) ◽  
pp. 217-220 ◽  
Author(s):  
G. B. Ayles
Keyword(s):  
Egg Size ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Lake Huron ◽  
Female Size ◽  
Brood Stock ◽  
Trout Population ◽  
Egg Diameter

Estimates of average egg diameter and average number of eggs per female from a brood stock of Salvelinus fontinalis × S. namaycush (splake) hybrids were 0.468 cm and 1169 eggs, respectively. Variation in egg size between females was attributable to variation in both size and age of the fish, whereas differences in fecundity were attributed only to differences in female size. At a given size a splake had more and larger eggs than have been reported for lake trout. The significance of the findings is discussed in relation to the reestablishment of a viable trout population in Lake Huron.

Thermal preference in relation to salinity in the threespine stickleback, Gasterosteus aculeatus L., with an interpretation of its significance

1977 ◽  
Vol 55 (3) ◽  
pp. 590-594 ◽  
Author(s):  
E. T. Garside ◽  
D. G. Heinze ◽  
S. E. Barbour
Keyword(s):  
Gasterosteus Aculeatus ◽  
Sea Water ◽  
Threespine Stickleback ◽  
Acclimation Temperature ◽  
Thermal Gradients ◽  
Mean Values ◽  
Lethal Temperatures ◽  
Preferred Temperatures ◽  
Thermal Preferences

Thermal preferences were determined in spacious thermal gradients of fresh water and sea water (32‰ salinity (S))for acclimations of 5, 15, and 25 °C in sea water, for samples of threespine stickleback Gasterosteus aculeatus L. Preferred temperatures increased through acclimations of 5–25 °C, with those for the freshwater tests being about 2 °C lower at each acclimation. Final preferenda were 16 and 18 °C for freshwater tests and seawater tests, respectively. The final preferendum in such haloplastic species is defined as the highest obtainable preferendum that equals acclimation temperature. A later series of disjunct preference determinations in approximately isosmotic water (10.5‰ S) for subjects acclimated to 7, 15, and 20 °C yielded mean values of 17.7, 18.2, and 18.7 °C, respectively. A final preferendum has not been designated since the samples were of separate origins. A parallel exists between these responses and the response of this and other haloplastic species in the determination of upper lethal temperatures. The immediate cause appears to be differentials in metabolic loading occasioned by l stresses.

A major sextet of mitochondrial DNA phylogenetic assemblages extant in eastern North American brook trout (Salvelinus fontinalis): distribution and postglacial dispersal patterns

1998 ◽  
Vol 76 (7) ◽  
pp. 1300-1318 ◽  
Author(s):  
Roy G Danzmann ◽  
Raymond P Morgan II ◽  
Matthew W Jones ◽  
Louis Bernatchez ◽  
Peter E Ihssen
Keyword(s):  
Mitochondrial Dna ◽  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Salvelinus Alpinus ◽  
Large Degree ◽  
Dispersal Patterns ◽  
Small Stream ◽  
South Central ◽  
Haplotype 1

Mitochondrial DNA (mtDNA) restriction fragment length polymorphisms (RFLPs) of 2422 brook trout (Salvelinus fontinalis) from 60 units (major drainages, small stream catchments, and isolated lakes) representing 155 populations in eastern North America were examined to test hypotheses regarding postglacial dispersal and recolonization. An analysis of molecular variance (AMOVA) indicated that 38.8% of the variation was partitioned among the units, while approximately 60% was distributed among populations (phiST = 59.3) compared with 40.7% within populations. This distribution of variation suggests a large degree of heterogeneity in population founding events and phylogeographic structuring in this species. Comparisons of mtDNA diversity between fish from putative refugial and recolonization zones for this species indicate that more than one refugial region contributed to northern recolonization. Haplotypic diversities in recolonized regions are greatest in south-central populations (i.e., southern Great Lakes region), while only one haplotype (haplotype 1) predominates in northern, western, and eastern postglacial zones. Large phylogenetic differences were found between northern and southern populations. Populations outside the zone of glaciation were the most genetically heterogeneous and were represented by fish from all six (A-F) of the major evolutionary clades identified. Only fish from the A, B, and C clades were found in glaciated regions, with C lineage fish restricted to south-central glaciation zones. Fish from the C clade are putatively the most ancestral lineage within the species based upon composite shared RFLPs with lake trout (Salvelinus namaycush) and Arctic char (Salvelinus alpinus).

scholarly journals Evidence of sound production by spawning lake trout (Salvelinus namaycush) in lakes Huron and Champlain

2018 ◽  
Vol 75 (3) ◽  
pp. 429-438 ◽  
Author(s):  
Nicholas S. Johnson ◽  
Dennis Higgs ◽  
Thomas R. Binder ◽  
J. Ellen Marsden ◽  
Tyler Buchinger ◽  
...  
Keyword(s):  
Acoustic Telemetry ◽  
Sound Production ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
Salvelinus Namaycush ◽  
Spawning Period ◽  
Sound Recordings ◽  
Laboratory Flume ◽  
And Control

Two sounds associated with spawning lake trout (Salvelinus namaycush) in lakes Huron and Champlain were characterized by comparing sound recordings with behavioral data collected using acoustic telemetry and video. These sounds were named “growls” and “snaps” and were heard on lake trout spawning reefs, but not on a nonspawning reef, and were more common at night than during the day. Growls also occurred more often during the spawning period than the prespawning period, while the trend for snaps was reversed. In a laboratory flume, sounds occurred when male lake trout were displaying spawning behaviors: growls when males were quivering and parallel swimming and snaps when males moved their jaw. Combining our results with the observation of possible sound production by spawning splake (Salvelinus fontinalis × Salvelinus namaycush hybrid) provides rare evidence for spawning-related sound production by a salmonid or any other fish in the superorder Protacanthopterygii. Further characterization of these sounds could be useful for lake trout assessment, restoration, and control.

scholarly journals JOINT SEGREGATION OF BIOCHEMICAL LOCI IN SALMONIDAE. II. LINKAGE ASSOCIATIONS FROM A HYBRIDIZED SALVELINUS GENOME (S. NAMAYCUSH x S. FONTINALIS)

Genetics ◽  
1980 ◽  
Vol 95 (3) ◽  
pp. 707-726
Author(s):  
Bernie May ◽  
Mark Stoneking ◽  
James E Wright
Keyword(s):  
Brook Trout ◽  
Lake Trout ◽  
Salvelinus Fontinalis ◽  
De Novo ◽  
Homeologous Chromosome ◽  
Homeologous Chromosomes ◽  
Joint Segregation ◽  
Duplicate Loci ◽  
Haploid Complement

ABSTRACT The results of more than 300 parwise examinations of biochemical loci for joint segregation in brook trout (Salvelinus fontinalis) and in the hybridized genome of lake trout (S. namaycush) × brook trout are summarized. Nineteen loci have been assigned to the following eight linkage groupings on the basis of nonrandom assortment, including cases of both classical linkage and pseudolinkage: ODH with PMI with PGI-3, PGI-2 with SDH, ADA-1 with AGP-2, AAT-(1,2) with AGP-1 with MDH-I, MDH-3 with MDH-4, LDH-3 with LDH-4, IDH-3 with ME-2 and GUS with CPK-I. Pseudolinkage (an excess of nonparental progeny types) was observed only for male testcross parents. The results suggest that this phenomenon involves homeologous chromosome arms as evidenced by the de novo association of presumed duplicate loci in each case. Classical linkage has not been found for the five pairs of duplicate loci examined in Salvelinus, suggesting that not all of the eight metacentrics in the haploid complement involve fusions of homeologous chromosomes. Females consistently showed a greater degree of recombination.

scholarly journals Molecular and physiological responses predict acclimation limits in juvenile brook trout (Salvelinus fontinalis)

2021 ◽  
Vol 224 (16) ◽  
Author(s):  
Theresa E. Mackey ◽  
Caleb T. Hasler ◽  
Travis Durhack ◽  
Jennifer D. Jeffrey ◽  
Camille J. Macnaughton ◽  
...  
Keyword(s):  
Heat Shock ◽  
High Temperatures ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Acute Stress ◽  
Physiological Responses ◽  
Heat Shock Protein 90 ◽  
Acclimation Temperature ◽  
Muscle Lactate ◽  
Air Exposure

ABSTRACT Understanding the resilience of ectotherms to high temperatures is essential because of the influence of climate change on aquatic ecosystems. The ability of species to acclimate to high temperatures may determine whether populations can persist in their native ranges. We examined physiological and molecular responses of juvenile brook trout (Salvelinus fontinalis) to six acclimation temperatures (5, 10, 15, 20, 23 and 25°C) that span the thermal distribution of the species to predict acclimation limits. Brook trout exhibited an upregulation of stress-related mRNA transcripts (heat shock protein 90-beta, heat shock cognate 71 kDa protein, glutathione peroxidase 1) and downregulation of transcription factors and osmoregulation-related transcripts (nuclear protein 1, Na+/K+/2Cl− co-transporter-1-a) at temperatures ≥20°C. We then examined the effects of acclimation temperature on metabolic rate (MR) and physiological parameters in fish exposed to an acute exhaustive exercise and air exposure stress. Fish acclimated to temperatures ≥20°C exhibited elevated plasma cortisol and glucose, and muscle lactate after exposure to the acute stress. Fish exhibited longer MR recovery times at 15 and 20°C compared with the 5 and 10°C groups; however, cortisol levels remained elevated at temperatures ≥20°C after 24 h. Oxygen consumption in fish acclimated to 23°C recovered quickest after exposure to acute stress. Standard MR was highest and factorial aerobic scope was lowest for fish held at temperatures ≥20°C. Our findings demonstrate how molecular and physiological responses predict acclimation limits in a freshwater fish as the brook trout in the present study had a limited ability to acclimate to temperatures beyond 20°C.

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