Electroshocking Influences Chinook Salmon Egg Survival and Juvenile Physiology and Immunology

Abstract While electrofishing has become a common capture technique in fisheries research, the potential impact of this technique on the fish is not completely understood. Mature female chinook salmon Oncorhynchus tshawytscha and eggs at key developmental stages were electroshocked with 10-s pulsed DC from a standard backpack electroshocker in a controlled environment. Eggs from one-third of the shocked females showed extreme mortality (>93%), while the remaining shocked families shared egg mortality (12-20%) similar to the controls (9.9%). Eggs shocked at the early eyed stage showed significantly higher mortality (34.2%) than control (unshocked) eggs, while mortalities were low (≤2.1%) for shocked eggs and for controls at all other developmental stages. Upon examination of fish radiographs, we found that the electroshocked juvenile fish had significantly more spinal aberrations than the unshocked fish. Hematocrit, serum cortisol and glucose, serum lysozyme activity, and total leukocyte counts were monito...

[1]  R. Carline.  Effects of High-Frequency Pulsed-DC Electrofishing on a Wild Brown Trout Population , 2001 .

[2]  S. Vanderkooi.  The effects of electroshock on immune function and disease progression in juvenile spring chinook salmon (Oncorhynchus tshawytscha) , 1999 .

[3]  Rick J. Cordes,et al.  Practical Observations on the Use of Eggs from Electroshocked Females during Spawning of Inland Fall Chinook Salmon , 1999 .

[4]  W. P. Dwyer,et al.  Physiological stress effects of continuous‐ and pulsed‐DC electroshock on juvenile bull trout , 1997 .

[5]  Tort,et al.  Cortisol and glucose responses after acute stress by net handling in the sparid red porgy previously subjected to crowding stress , 1997, Journal of fish biology.

[6]  C. Bayne,et al.  The immediate effects of stress on hormones and plasma lysozyme in rainbow trout. , 1997, Developmental and comparative immunology.

[7]  S. C. Riley,et al.  Spinal Injury Rates in Three Wild Trout Populations in Colorado after Eight Years of Backpack Electrofishing , 1997 .

[8]  B. Barton,et al.  Effect of AC electroshock on blood features in juvenile rainbow trout , 1996 .

[9]  T. McMahon,et al.  Effect of Electrofishing Pulse Shape and Electrofishing-Induced Spinal Injury on Long-Term Growth and Survival of Wild Rainbow Trout , 1996 .

[10]  J. Tipping,et al.  Survival of Electroanesthetized Adult Steelhead and Eggs of Fall Chinook Salmon , 1996 .

[11]  R. T. Muth,et al.  Effects of Two Electrofishing Currents on Captive Ripe Razorback Suckers and Subsequent Egg-Hatching Success , 1996 .

[12]  W. P. Dwyer,et al.  Effects of Electroshock Voltage, Wave Form, and Pulse Rate on Survival of Cutthroat Trout Eggs , 1995 .

[13]  R. Carline,et al.  Injury to Wild Brook Trout by Backpack Electrofishing , 1994 .

[14]  M. Mesa,et al.  Efficacy of Electrofishing to Assess Plasma Cortisol Concentration in Juvenile Chinook Salmon Passing Hydroelectric Dams on the Columbia River , 1994 .

[15]  D. A. House,et al.  Reducing Electrofishing-Induced Injury of Rainbow Trout , 1994 .

[16]  W. P. Dwyer,et al.  Influence of Electroshock and Mechanical Shock on Survival of Trout Eggs , 1993 .

[17]  K. Røed,et al.  Genetic variation in lysozyme activity and spontaneous haemolytic activity in Atlantic salmon (Salmo salar) , 1993 .

[18]  D. Heath,et al.  Genetic, environmental, and interaction effects on growth and stress response of chinook salmon (Oncorhynchus tshawytscha) fry , 1993 .

[19]  A. Möck,et al.  Lysozyme activity in rainbow trout, Oncorhynchus mykiss (Walbaum), stressed by handling, transport and water pollution , 1990 .

[20]  W. Rice.  ANALYZING TABLES OF STATISTICAL TESTS , 1989, Evolution; international journal of organic evolution.

[21]  B. Grinde,et al.  Species and individual variation in lysozyme activity in fish of interest in aquaculture , 1988 .

[22]  C. Schreck,et al.  Multiple Acute Disturbances Evoke Cumulative Physiological Stress Responses in Juvenile Chinook Salmon , 1986 .

[23]  M. Syed,et al.  Improved Agar Plate Assays of Bovine Lysozyme and Haemolytic Complement Activity , 1986, Acta Veterinaria Scandinavica.

[24]  B. Barton,et al.  Plasma Cortisol Levels of Fingerling Rainbow Trout (Salmo gairdneri) at Rest, and Subjected to Handling, Confinement, Transport, and Stocking , 1980 .

[25]  Carl B. Schreck,et al.  Anesthetic and Handling Stress on Survival and Cortisol Concentration in Yearling Chinook Salmon (Oncorhynchus tshawytscha) , 1978 .

[26]  J. Madden,et al.  Use of electroanaesthesia with freshwater teleosts: some physiological consequences in the rainbow trout, Salmo gairdneri Richardson , 1976 .

[27]  C. Schreck,et al.  Physiological Responses of Rainbow Trout (Salmo gairdneri) to Electroshock , 1976 .

[28]  D. McLeay.  Sensitivity of Blood Cell Counts in Juvenile Coho Salmon (Oncorhynchus kisutch) to Stressors Including Sublethal Concentrations of Pulpmill Effluent and Zinc , 1975 .

[29]  R. A. Marriott.  Effects of Electric Shocking on Fertility of Mature Pink Salmon , 1973 .

[30]  R. H. Lander,et al.  Survival, Growth, and Fecundity of Hatchery-Reared Rainbow Trout after Exposure to Pulsating Direct Current , 1971 .

[31]  E. Osserman,et al.  SERUM AND URINARY LYSOZYME (MURAMIDASE) IN MONOCYTIC AND MONOMYELOCYTIC LEUKEMIA , 1966, The Journal of experimental medicine.

[32]  H. Godfrey.  Mortalities Among Developing Trout and Salmon Ova Following Shock by Direct-Current Electrical Fishing Gear , 1957 .