An assessment of the use of low-level aerobic swimming in promoting recovery from handling stress in rainbow trout

1996 ◽  
Vol 4 (2) ◽  
pp. 169-174 ◽  
Author(s):  
Walter F. Meyer ◽  
Peter A. Cook
Keyword(s):  
Rainbow Trout ◽  
Handling Stress ◽  
Low Level

Lamprey Parasitism of Rainbow Trout in Southern Georgian Bay

1967 ◽  
Vol 24 (12) ◽  
pp. 2539-2548 ◽  
Author(s):  
A. H. Berst ◽  
A. A. Wainio
Keyword(s):  
Rainbow Trout ◽  
Fork Length ◽  
Georgian Bay ◽  
Low Level ◽  
Spawning Streams

Of 2614 adult rainbow trout sampled from the Nottawasaga River of Georgian Bay during the period of 1961–67 inclusive, approximately 7.1% had one or more lamprey marks. The trout ranged in fork length from 10 to 33 inches (25 to 84 cm). However, lamprey marks were present only on fish over 16 inches (40 cm) in length. Multiple scarring was found on 30% of the trout that were marked. The incidence of marked fish reached a maximum of 17.2% in the spring of 1962, then declined to 1.3% in the fall of the same year. This decline was coincident with a reduction in the lamprey population after experimental lampricide treatment of the Nottawasaga River and adjacent lamprey spawning streams during 1960 and 1961. The incidence of marked fish remained at a relatively low level for a period of 4 years, then increased substantially, after the presumed recruitment of metamorphosed lampreys during 1966 and 1967.

Cytoskeletal Reorganization and Altered Phagocytotic Ability in Primary Cultures of Rainbow Trout Hemopoietic Tissue Exposed to Low-Level Ionizing Radiation

2005 ◽  
Vol 164 (1) ◽  
pp. 45-52 ◽  
Author(s):  
Peter M. Olwell ◽  
David C. Cottell ◽  
Sharon Ní Shúilleabháin ◽  
Paola Maderna ◽  
Colin Seymour ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Ionizing Radiation ◽  
Primary Cultures ◽  
Cytoskeletal Reorganization ◽  
Low Level ◽  
Hemopoietic Tissue

Metal X-ray microanalysis in the olfactory system of rainbow trout exposed to low level of copper

1995 ◽  
Vol 83 (1) ◽  
pp. 77-86 ◽  
Author(s):  
A. Karyn Julliard ◽  
Diane Saucier ◽  
Liliane Astic
Keyword(s):  
Rainbow Trout ◽  
Olfactory System ◽  
X Ray ◽  
Low Level

Handling stress does not affect the expression of hepatic heat shock protein 70 and conjugation enzymes in rainbow trout treated with β-naphthoflavone

Life Sciences ◽  
1997 ◽  
Vol 61 (2) ◽  
pp. 117-127 ◽  
Author(s):  
Mathilakath M. Vijayan ◽  
Cristina Pereira ◽  
Robert B. Forsyth ◽  
Christopher J. Kennedy ◽  
George K. Iwama
Keyword(s):  
Rainbow Trout ◽  
Heat Shock ◽  
Heat Shock Protein ◽  
Heat Shock Protein 70 ◽  
Handling Stress

scholarly journals Comparison of Individual and Pooled Sampling Methods for Detecting Bacterial Pathogens of Fish

2005 ◽  
Vol 17 (4) ◽  
pp. 305-310 ◽  
Author(s):  
Sonia Mumford ◽  
Chris Patterson ◽  
Joy Evered ◽  
Ray Brunson ◽  
Jay Levine ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Bacterial Infections ◽  
Sampling Methods ◽  
Bacterial Pathogens ◽  
Yersinia Ruckeri ◽  
Fish Pathogens ◽  
Blue Book ◽  
Low Level ◽  
Pooled Samples ◽  
Positive Groups

Examination of finfish populations for viral and bacterial pathogens is an important component of fish disease control programs worldwide. Two methods are commonly used for collecting tissue samples for bacteriological culture, the currently accepted standards for detection of bacterial fish pathogens. The method specified in the Office International des Epizooties Manual of Diagnostic Tests for Aquatic Animals permits combining renal and splenic tissues from as many as 5 fish into pooled samples. The American Fisheries Society (AFS) Blue Book/US Fish and Wildlife Service (USFWS) Inspection Manual specifies the use of a bacteriological loop for collecting samples from the kidney of individual fish. An alternative would be to more fully utilize the pooled samples taken for virology. If implemented, this approach would provide substantial savings in labor and materials. To compare the relative performance of the AFS/USFWS method and this alternative approach, cultures of Yersinia ruckeri were used to establish low-level infections in groups of rainbow trout ( Oncorhynchus mykiss) that were sampled by both methods. Yersinia ruckeri was cultured from 22 of 37 groups by at least 1 method. The loop method yielded 18 positive groups, with 1 group positive in the loop samples but negative in the pooled samples. The pooled samples produced 21 positive groups, with 4 groups positive in the pooled samples but negative in the loop samples. There was statistically significant agreement (Spearman coefficient 0.80, P < 0.001) in the relative ability of the 2 sampling methods to permit detection of low-level bacterial infections of rainbow trout.

Effect of Prior Acid Exposure on Physiological Responses of Juvenile Rainbow Trout (Salmo gairdneri) to Acute Handling Stress

1985 ◽  
Vol 42 (4) ◽  
pp. 710-717 ◽  
Author(s):  
Bruce A. Barton ◽  
Gary S. Weirter ◽  
Cars B. Schreck
Keyword(s):  
Rainbow Trout ◽  
Plasma Glucose ◽  
Plasma Cortisol ◽  
Acid Stress ◽  
Peak Level ◽  
Acid Exposure ◽  
Salmo Gairdneri ◽  
Plasma Sodium ◽  
Handling Stress ◽  
Juvenile Rainbow Trout

Acid-stressed fish appear to be more sensitive to additional stressors than unstressed fish. When juvenile rainbow trout, Salmo gairdneri, were exposed to acid conditions (pH 5.7–4.7) for 5 d, plasma cortisol was affected only slightly during the initial hours of exposure, but plasma glucose and hematocrit increased, and plasma sodium decreased. However, when fish held at pH 4.7 were subsequently subjected to a 30-s handling stress, poststress plasma cortisol rose to a peak level of more than twice that in handled fish held at ambient pH (6.6). Effects of handling on plasma glucose or sodium were not apparent against levels already altered by the chronic acid exposure, judging by the corticosteroid response, we conclude that the acid-stressed fish were more sensitive to additional handling, even though they appeared to be physiologically normal after 5 d. Thus, as a management consideration, when fish are stocked in acidified waters, care should be taken to avoid situations where the fish may encounter additional disturbances in the new environment. Plasma glucose and sodium were better indicators of chronic acid stress alone than plasma cortisol, but the greater cortisol response to handling at low pH may be a useful method of detecting increased interrenal activity during early stages of environmental acidification.

Effect of recovery parameters on critical swimming speed of juvenile rainbow trout (Oncorhynchus mykiss)

1997 ◽  
Vol 75 (10) ◽  
pp. 1724-1727 ◽  
Author(s):  
S. Peake ◽  
R. S. McKinley ◽  
C. Barth
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Swimming Speed ◽  
Recovery Phase ◽  
Physiological Status ◽  
Critical Swimming Speed ◽  
Handling Stress ◽  
Juvenile Rainbow Trout ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Recovery Times

Critical swimming speed (Ucrit) is commonly measured to evaluate the influence of particular parameters on the swimming ability and physiological status of fish. Prior to experiments, fish are often forced to swim at low speed for a period of time to allow them to recover from handling stress. In the past, recovery times and speeds have varied from study to study but their possible effects on Ucrit have not been thoroughly examined. Therefore, hatchery-reared juvenile rainbow trout (Oncorhynchus mykiss) were forced to swim at a velocity of 26.5 cm/s for 0, 0.5, 1, 2, 4, 8, or 16 h or at a velocity of 0, 17.0, 21.8, 26.5, 36.0, or 45.5 cm/s for 0.5 h prior to being subjected to the Ucrit protocol (5-min intervals and 2.5 cm/s increments were used). Fish were tested at 6 and 18 °C. Mean Ucrit values were independent of recovery time and speed at both temperatures, suggesting that the recovery phase of the protocol may not be required and that inconsistencies in Ucrit values among studies are probably not attributable to differences in recovery parameters used.

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