Observations on the Lake Trout of Great Bear Lake

1948 ◽  
Vol 7b (4) ◽  
pp. 176-189 ◽  
Author(s):  
R. B. Miller ◽  
W. A. Kennedy
Keyword(s):  
Shallow Water ◽  
Detailed Analysis ◽  
Lake Trout ◽  
The Other ◽  
Food Sources ◽  
Bear Lake ◽  
Near Shore ◽  
Mature Fish ◽  
Terrestrial Insects ◽  
River Mouths

The lake trout (Cristivomer namaycush) is the principal fish of Great Bear lake. The largest populations were found in semi-isolated bays, with smaller populations in the open lake on one hand and in river mouths and marshy areas on the other. The trout grow very slowly; by three years they are just over three inches (7.6 cm.) long and weigh one ounce (28 g.). A weight of one pound (0.45 kg.) is achieved in their ninth year and two pounds in their fourteenth year. Maturity is reached in from 13 to 17 years; the rate of growth in weight increases after maturity. Mature fish appear to spawn only every second or third year. Spawning begins about the middle of August. The young trout spend their first four summers in shallow water near shore. The adults feed on all food sources in the lake,—plankton, bottom organisms, fish and terrestrial insects. Fish preparing to spawn have pale flesh; others have orange to red flesh. There is some evidence of two morphologically distinct groups, probably resulting from environmental differences. A list of the parasites of the trout is given. A detailed analysis of the incidence of cysts of Triaenophorus crassus indicates that adult trout remain in one locality throughout life.

Life-history variation among four shallow-water morphotypes of lake trout from Great Bear Lake, Canada

2016 ◽  
Vol 42 (2) ◽  
pp. 193-203 ◽  
Author(s):  
Louise Chavarie ◽  
Kimberly Howland ◽  
Paul Venturelli ◽  
Benjamin C. Kissinger ◽  
Ross Tallman ◽  
...  
Keyword(s):  
Life History ◽  
Shallow Water ◽  
Lake Trout ◽  
Life History Variation ◽  
Bear Lake

Growth, Maturity and Mortality in the Relatively Unexploited Lake Trout, Cristivomer namaycush, of Great Slave Lake

1954 ◽  
Vol 11 (6) ◽  
pp. 827-852 ◽  
Author(s):  
W. A. Kennedy
Keyword(s):  
Significant Variation ◽  
Lake Trout ◽  
The Other ◽  
Commercial Fishing ◽  
Bear Lake ◽  
Great Slave Lake ◽  
Class Strength ◽  
Mature Size ◽  
Commercial Size ◽  
Annual Mortality

Ages of 9,215 lake trout were determined. Length-weight and time-maturity relationships are shown. Sex ratio is 1:1. Only half the females of mature size spawn each year. There is no growth except during June to September, inclusive. There is a tremendous difference in size at a given age. Growth is much faster in one half of the lake than in the other, it is the same as or slightly slower than in lakes farther south and considerably faster than in Great Bear Lake. Seven years of commercial fishing did not increase total annual mortality by much. Mortality rate increases with age among all fish of catchable size. A given year-class probably attains maximum biomass well before most of its members reach commercial size. No significant variation in year-class strength was found.

Sympatric Polymorphism in Lake Trout: The Coexistence of Multiple Shallow-Water Morphotypes in Great Bear Lake

2013 ◽  
Vol 142 (3) ◽  
pp. 814-823 ◽  
Author(s):  
Louise Chavarie ◽  
Kimberly L. Howland ◽  
William M. Tonn
Keyword(s):  
Shallow Water ◽  
Lake Trout ◽  
Bear Lake

scholarly journals Evolution and origin of sympatric shallow-water morphotypes of Lake Trout, Salvelinus namaycush, in Canada’s Great Bear Lake

Heredity ◽  
2014 ◽  
Vol 114 (1) ◽  
pp. 94-106 ◽  
Author(s):  
L N Harris ◽  
L Chavarie ◽  
R Bajno ◽  
K L Howland ◽  
S H Wiley ◽  
...  
Keyword(s):  
Shallow Water ◽  
Lake Trout ◽  
Salvelinus Namaycush ◽  
Bear Lake

Hawaii Experimental Acoustics Range for Shallow Water Applications

2011 ◽  
Vol 45 (3) ◽  
pp. 69-76 ◽  
Author(s):  
Tom Fedenczuk ◽  
Eva-Marie Nosal
Keyword(s):  
Shallow Water ◽  
Water Environment ◽  
Shallow Water Acoustics ◽  
Central Node ◽  
Long Baseline ◽  
Wide Range ◽  
Shallow Water Environment ◽  
Near Shore ◽  
Monitoring And Surveillance ◽  
Passive Acoustic

AbstractShallow water acoustics provide a means for monitoring and surveillance of near-shore environments. This paper describes the current and future capabilities of the low- to high-frequency Hawaii Experimental Acoustics Range (HEAR) that was designed to facilitate a wide range of different shallow water acoustics experiments and allow researchers from various institutions to test various array components and configurations. HEAR is a portable facility that consists of multiple hydrophones (12‐16) cabled independently to a common central node. The design allows for variable array configurations and deployments in three modes: experimental (off boats and piers), autonomous, and cabled. An application of HEAR is illustrated by the results from a deployment at Makai Research Pier, Oahu, Hawaii. In this deployment, HEAR was configured as a long-baseline range of two volumetric subarrays to study passive acoustic tracking capabilities in a shallow water environment.

Tidal fish connectivity of reef and sea grass habitats in the Indo-Pacific

2007 ◽  
Vol 87 (5) ◽  
pp. 1287-1296 ◽  
Author(s):  
Richard K.F. Unsworth ◽  
James J. Bell ◽  
David J. Smith
Keyword(s):  
Shallow Water ◽  
National Park ◽  
Fish Assemblages ◽  
Fish Fauna ◽  
Subsistence Fisheries ◽  
Tidal State ◽  
Sea Grass ◽  
Water Fish ◽  
Tidal Changes ◽  
Near Shore

The present study considered the influence of the tide on shallow water fish assemblages within the Wakatobi Marine National Park, Indonesia. Timed underwater visual observations were made across a gradient of intertidal to subtidal habitats from near-shore to reef crest at different tidal heights. Transient fish were found to dominate shallow water fish assemblages and the assemblage composition varied with tidal state. Fish assemblages were more diverse and abundant at higher tides in both coral and sea grass habitats, however, this was more pronounced within sea grass habitats. A tidal reduction from ≈2.0m to ≈0.8m (above chart datum) corresponded to a 30% reduction in fish abundance, while species richness also significantly decreased from 13.5 to 10.8 species per standardized timed observation. Fifty fish groups were reported from sea grass habitats with the most abundant being from the Engraulidae family and Lethrinus harak, which form important local subsistence fisheries. This research confirms the importance of tidal changes in structuring the fish fauna of Indonesian sea grass habitats and underlines the connectivity that exists between these habitats and nearby coral reefs.

Measurement of deceptive voices: Comparing acoustic and perceptual data

1997 ◽  
Vol 18 (4) ◽  
pp. 471-484 ◽  
Author(s):  
Patricia Rockwell ◽  
David B. Buller ◽  
Judee K. Burgoon
Keyword(s):  
Detailed Analysis ◽  
The Other ◽  
Vocal Behavior

ABSTRACTThis study compared vocal features of deception that can be measured by acoustic equipment with vocal features of deception that can be measured perceptually by human coders. As deception researchers have traditionally measured vocal behavior with either acoustic or perceptual methods (but not both), it is uncertain what correspondence, if any, exists between these methods. This study attempted to determine the degree of this correspondence. Deceptive interactions from an earlier study (Burgoon, Buller, Ebesu, & Rockwell, 1994) were used to conduct a detailed analysis of the vocal features of deceptive speech. The vocal samples were analyzed perceptually and acoustically. Results indicated moderate correlations between some acoustic and perceptual variables; neither measurement type, however, proved conclusively superior to the other in discriminating between truth and deception.

Folk-Inspired Neoclassical vs Folk-Inspired Compositions

2021 ◽  
Author(s):  
Kendra Klages
Keyword(s):  
Detailed Analysis ◽  
Folk Music ◽  
The Other ◽  
Research Project ◽  
The World ◽  
Applied Lessons ◽  
Over Time

My research project focuses on folk inspired music of Poland, England, China, and Ireland. In my applied lessons on clarinet, I studied two neoclassical Polish folk pieces, so the question answered in the research is how the two neoclassical Polish pieces compare to folk inspired pieces from other countries. The pieces chosen for this study are mainly pieces that I have heard before. Therefore, I chose the pieces based upon my familiarity with them. Folk music expresses the sounds and rhythms that represent countries all over the world. Over time these sounds and rhythms evolve to reflect the country at that moment. This study will reflect how folk music was implemented into different pieces with a focus on Polish neoclassical folk pieces versus English, Chinese, and Irish folk pieces. There is a detailed analysis focused on two Polish compositions. While the focus of the other global pieces is to allow one to understand how folk music was being used in compositions specific to the country being studied. The purpose of this study is to understand how folk tunes and characteristics can be expressed through larger compositions, and how the different countries and genres approached that. Furthermore, the study compares Polish folk music to the folk music of other countries and where Polish folk composers stand in originality and experimentalism with the composers of England, China, and Ireland.

Is predation intensity reduced with increasing depth? Evidence from the west Atlantic stalked crinoidEndoxocrinus parrae(Gervais) and implications for the Mesozoic marine revolution

Paleobiology ◽  
1996 ◽  
Vol 22 (3) ◽  
pp. 339-351 ◽  
Author(s):  
Tatsuo Oji
Keyword(s):  
Shallow Water ◽  
The Other ◽  
The West ◽  
Bathymetric Range ◽  
Late Mesozoic ◽  
Predation Intensity ◽  
Stalked Crinoids ◽  
The Caribbean ◽  
Mesozoic Marine Revolution ◽  
Sublethal Predation

The number of regenerated arms was counted on specimens of two distinct phenotypes of the stalked crinoidEndoxocrinus parrae(Gervais) from a wide bathymetric range in the Caribbean (178-723 m). In one phenotype, the sample was divided into two groups, one from shallower (< 500 m) depths, the other from deeper (≥ 500 m); in the other phenotype the group divided at 550 m. In both phenotypes, the frequency of regenerated arms is significantly higher in specimens from shallower water than in those from deeper water. If the regenerated arms inEndoxocrinus parraewere the result of sublethal predation, as previously suggested, then predation intensity is higher in shallow water than deep water. These results are consistent with the idea of the late Mesozoic marine revolution—that there has been stronger predation on various invertebrates in shallow-water environments since the late Mesozoic. The stalked crinoids may have been unable to cope with increased predation in shelf environments, and they migrated to offshore environments.

The Roman Fort at Bainbridge, Wensleydale: Excavations by B.R. Hartley on the Principia and a Summary Account of Other Excavations and Surveys

Britannia ◽  
2012 ◽  
Vol 43 ◽  
pp. 45-113 ◽  
Author(s):  
Paul Bidwell
Keyword(s):  
Detailed Analysis ◽  
Tenth Century ◽  
Roman Period ◽  
The Other ◽  
Main Text ◽  
Commanding Officer ◽  
Supplementary Material

AbstractOccupation at Bainbridge began in the governorship of Agricola. Little is known of the first fort; the visible remains represent a successor fort, established in c.a.d. 85 at the earliest, abandoned under Hadrian and Antoninus Pius, and reoccupied in c. a.d. 160. In the early Severan period, the size of the unit at the fort seems to have been greatly reduced in numbers, and a suite of rooms for an officer was inserted in the principia. Extensive work by cohors VI Nerviorum which took place in c. a.d. 205–7 included the building of new principia, the relocation of the east gate, and probably the addition of an annexe, its wall described in an inscription from the site as a bracchium. The fort was held until the end of the Roman period, by which time the principia had been partly demolished to provide space for a timber building probably accommodating the commanding officer. The aedes and part of the rear range seem to have stood until the ninth or tenth century, when the former was possibly converted into a church. Knowledge of this sequence of occupation depends largely on the results of Brian Hartley's excavations which are published here. The main focus of the report is on the remarkable series of principia, but a review of what is known of the overall archaeology of the fort is also included in the main text. The Supplementary Material (http://journals.cambridge.org/bri) contains a more detailed analysis of some of the other excavations together with various specialist reports.

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