Alec Maule, Ph.D.
Alec is a Research Physiologist Emeritus for the USGS, Columbia River Research Laboratory.
Science and Products
Filter Total Items: 65
Influence of bacterial kidney disease on smoltification in salmonids: Is it a case of double jeopardy?
We investigated the effects of a chronic, progressive infection with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), on selected aspects of smoltification in yearling juvenile spring chinook salmon (Oncorhynchus tshawytscha). After experimentally infecting fish with Rs using an immersion challenge, we sampled them every two weeks to monitor changes in gill N
Authors
M.G. Mesa, A.G. Maule, T.P. Poe, C.B. Schreck
Influence of infection with Renibacterium salmoninarum on susceptibility of juvenile spring chinook salmon to gas bubble trauma
During experiments in our laboratory to assess the progression and severity of gas bubble trauma (GBT) in juvenile spring chinook salmon Oncorhynchus tshawytscha, we had the opportunity to assess the influence of Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease, on the susceptibility of salmon to GBT. We exposed fish with an established infection of Rs to 120% total
Authors
L.K. Weiland, M.G. Mesa, A.G. Maule
Assessment of smolt condition for travel time analysis. Annual report 1993-1994
Abstract not available
Authors
R. M. Schrock, P.V. Haner, K.M. Hans, J.W. Beeman, S. P. VanderKooi, J.D. Hotchkiss, P.A. Petrusso, S.G. Smith, A.G. Maule
Stress-induced immune-endocrine interaction
No abstract available
Authors
A.G. Maule, S. P. VanderKooi
Vulnerability to predation and physiological stress responses in juvenile chinook salmon (Oncorhynchus tshawytscha) experimentally infected with Renibacterium salmoninarum
We experimentally infected juvenile chinook salmon (Oncorhynchus tshawytscha) with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), to examine the vulnerability to predation of fish with differing levels of Rs infection and assess physiological change during progression of the disease. Immersion challenges conducted during 1992 and 1994 produced fish with eit
Authors
M.G. Mesa, T.P. Poe, A.G. Maule, C.B. Schreck
Evaluation of a new miniature pressure-sensitive radio transmitter
A miniature pressure-sensitive radio transmitter (tag) was evaluated and field tested as a tool for determining the depths of juvenile salmonids. The tag had an effective radiated power of −19.7 decibels (1 mW reference), dimensions of 23 mm × 7 mm, and a weight of 2.2 g in air. The pulse rate of the tag increased with pressure, resulting in an expected tag life of approximately 11 d at the water
Authors
J.W. Beeman, P.V. Haner, A.G. Maule
Assessment of smolt condition for travel time analysis. Draft summary report 1987-1997
No abstract available
Authors
R. M. Schrock, J.W. Beeman, P.V. Haner, K. Hans, J. Hotchkiss, S. Sauter, S. Vanderkooi, A.G. Maule
Incidence of Renibacterium salmoninarum infections in juvenile hatchery spring chinook salmon in the Columbia and Snake Rivers
From 1988 through 1992, we assessed the prevalence (frequency of occurrence) and severity (degree of infection) of Renibacterium salmoninarum (RS) among fish in marked groups of Columbia River basin and Snake River basin hatchery spring chinook salmon Oncorhynchus tshawytscha before release and during their seaward migration. During the study, prevalence of RS infection decreased (from >90% to <65
Authors
A.G. Maule, D.W. Rondorf, J.W. Beeman, P.V. Haner
Immune and endocrine responses of adult spring Chinook salmon during freshwater migration and sexual maturation
The immune –endocrine responses in spring chinook salmon (Oncorhynchus tshawytscha) were examined during their freshwater migration and final maturation. In 1990, migrating fish had high plasma cortisol titres (means 200 ng ml−1) and generated relatively few antibody-producing cells (APC) from peripheral blood leukocytes (PBL) (100 –200 per culture). After three weeks acclimation in constant envir
Authors
A.G. Maule, R. M. Schrock, C. Slater, M.S. Fitzpatrick, C. B. Schreck
Gas bubble trauma monitoring and research of juvenile salmnonids. Annual report 1996
no abstract available
Authors
A.G. Maule, J.W. Beeman, K.M. Hans, M.G. Mesa, P.V. Haner, J.J. Warren
Skin reflectance as a non-lethal measure of smoltification for juvenile salmonids
Our efforts to find nonlethal methods of assessing the parr-smoll transformation of juvenile steelhead Oncorhynchus mykiss and spring and fall chinook salmon O. tshawytscha led to the development of a video system for quantitatively measuring skin silvering using skin reflectance. Gill Na'.K'-ATPase activity, skin guanine concentration, and skin reflectance were recorded from groups of fish marked
Authors
Philip V. Haner, Joyce C. Faler, Robin M. Schrock, Dennis W. Rondorf, Alec G. Maule
The effects of incidental electrofishing on adult spring Chinook salmon
No abstract available
Authors
S.D. Smith, A.G. Maule, T.P. Poe
Science and Products
Filter Total Items: 65
Influence of bacterial kidney disease on smoltification in salmonids: Is it a case of double jeopardy?
We investigated the effects of a chronic, progressive infection with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), on selected aspects of smoltification in yearling juvenile spring chinook salmon (Oncorhynchus tshawytscha). After experimentally infecting fish with Rs using an immersion challenge, we sampled them every two weeks to monitor changes in gill N
Authors
M.G. Mesa, A.G. Maule, T.P. Poe, C.B. Schreck
Influence of infection with Renibacterium salmoninarum on susceptibility of juvenile spring chinook salmon to gas bubble trauma
During experiments in our laboratory to assess the progression and severity of gas bubble trauma (GBT) in juvenile spring chinook salmon Oncorhynchus tshawytscha, we had the opportunity to assess the influence of Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease, on the susceptibility of salmon to GBT. We exposed fish with an established infection of Rs to 120% total
Authors
L.K. Weiland, M.G. Mesa, A.G. Maule
Assessment of smolt condition for travel time analysis. Annual report 1993-1994
Abstract not available
Authors
R. M. Schrock, P.V. Haner, K.M. Hans, J.W. Beeman, S. P. VanderKooi, J.D. Hotchkiss, P.A. Petrusso, S.G. Smith, A.G. Maule
Stress-induced immune-endocrine interaction
No abstract available
Authors
A.G. Maule, S. P. VanderKooi
Vulnerability to predation and physiological stress responses in juvenile chinook salmon (Oncorhynchus tshawytscha) experimentally infected with Renibacterium salmoninarum
We experimentally infected juvenile chinook salmon (Oncorhynchus tshawytscha) with Renibacterium salmoninarum (Rs), the causative agent of bacterial kidney disease (BKD), to examine the vulnerability to predation of fish with differing levels of Rs infection and assess physiological change during progression of the disease. Immersion challenges conducted during 1992 and 1994 produced fish with eit
Authors
M.G. Mesa, T.P. Poe, A.G. Maule, C.B. Schreck
Evaluation of a new miniature pressure-sensitive radio transmitter
A miniature pressure-sensitive radio transmitter (tag) was evaluated and field tested as a tool for determining the depths of juvenile salmonids. The tag had an effective radiated power of −19.7 decibels (1 mW reference), dimensions of 23 mm × 7 mm, and a weight of 2.2 g in air. The pulse rate of the tag increased with pressure, resulting in an expected tag life of approximately 11 d at the water
Authors
J.W. Beeman, P.V. Haner, A.G. Maule
Assessment of smolt condition for travel time analysis. Draft summary report 1987-1997
No abstract available
Authors
R. M. Schrock, J.W. Beeman, P.V. Haner, K. Hans, J. Hotchkiss, S. Sauter, S. Vanderkooi, A.G. Maule
Incidence of Renibacterium salmoninarum infections in juvenile hatchery spring chinook salmon in the Columbia and Snake Rivers
From 1988 through 1992, we assessed the prevalence (frequency of occurrence) and severity (degree of infection) of Renibacterium salmoninarum (RS) among fish in marked groups of Columbia River basin and Snake River basin hatchery spring chinook salmon Oncorhynchus tshawytscha before release and during their seaward migration. During the study, prevalence of RS infection decreased (from >90% to <65
Authors
A.G. Maule, D.W. Rondorf, J.W. Beeman, P.V. Haner
Immune and endocrine responses of adult spring Chinook salmon during freshwater migration and sexual maturation
The immune –endocrine responses in spring chinook salmon (Oncorhynchus tshawytscha) were examined during their freshwater migration and final maturation. In 1990, migrating fish had high plasma cortisol titres (means 200 ng ml−1) and generated relatively few antibody-producing cells (APC) from peripheral blood leukocytes (PBL) (100 –200 per culture). After three weeks acclimation in constant envir
Authors
A.G. Maule, R. M. Schrock, C. Slater, M.S. Fitzpatrick, C. B. Schreck
Gas bubble trauma monitoring and research of juvenile salmnonids. Annual report 1996
no abstract available
Authors
A.G. Maule, J.W. Beeman, K.M. Hans, M.G. Mesa, P.V. Haner, J.J. Warren
Skin reflectance as a non-lethal measure of smoltification for juvenile salmonids
Our efforts to find nonlethal methods of assessing the parr-smoll transformation of juvenile steelhead Oncorhynchus mykiss and spring and fall chinook salmon O. tshawytscha led to the development of a video system for quantitatively measuring skin silvering using skin reflectance. Gill Na'.K'-ATPase activity, skin guanine concentration, and skin reflectance were recorded from groups of fish marked
Authors
Philip V. Haner, Joyce C. Faler, Robin M. Schrock, Dennis W. Rondorf, Alec G. Maule
The effects of incidental electrofishing on adult spring Chinook salmon
No abstract available
Authors
S.D. Smith, A.G. Maule, T.P. Poe