Download or read book Behavioral Response of Juvenile Chinook Salmon Oncorhynchus Tshawytscha to Various Paddle Wheel Configurations written by Charles H. Hanson and published by . This book was released on 1980 with total page 12 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Behavioural Responses of Juvenile Chinook Salmon Oncorhynchus Tshawytscha to Changes in Water Temperature written by Lana Klassen and published by . This book was released on 2001 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Delta Fish Facilities Program Report Through June 30 1982 written by Dan B. Odenweller and published by . This book was released on 1982 with total page 106 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Technical Report written by and published by . This book was released on 1982 with total page 286 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book California State Publications written by and published by . This book was released on 1980 with total page 1138 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Interagency Ecological Study Program for the Sacramento San Joaquin Estuary written by and published by . This book was released on 1980 with total page 218 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Response of Juvenile Chinook Salmon Oncorhynchus Tshawytscha and American Shad Alosa Sapidissima to Long Term Exposure to Two vector Velocity Flows written by Robert M. Kano and published by . This book was released on 1982 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Inland Fisheries Administrative Report written by and published by . This book was released on 1988 with total page 278 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Factors Affecting the Saltwater entry Behavior and Saltwater Preference of Juvenile Chinook Salmon Oncorhynchus Tshawytscha written by Carol Seals Price and published by . This book was released on 2002 with total page 378 pages. Available in PDF, EPUB and Kindle. Book excerpt: From 1998-2000, laboratory studies were conducted to examine factors that impact saltwater-entry behavior and saltwater preference (SWP) of juvenile chinook salmon, Oncorhynchus tshawytscha. These factors included bacterial kidney disease, stress and the presence of trout, O. mykiss. An additional study investigated the orientation of the startle response of chinook salmon within a salinity gradient. All experiments were conducted in 757-1 tanks in which a stable, vertical salinity gradient was established. SWP was decreased in fish suffering from bacterial kidney disease (31 ± 20.0%), compared with control fish (85 ± 17.6%). A mild chasing stressor resulted in a 26% decrease in SWP relative to unstressed fish. After a severe handling stressor, only 20% of fish preferred salt water, compared with 100% of unstressed controls. After exposure to an overhead predator model, severely stressed fish descended into the saltwater layer, but this response was transient. The presence of non-aggressive steelhead trout did not affect SWP of chinook salmon. Chinook salmon stocked with rainbow trout displayed decreased SWP. Aggression levels in tanks with rainbow trout were higher than in tanks with only chinook salmon. The orientation of the startle response was affected by the presence of salt water. Fish that preferred salt water within a gradient responded by moving horizontally within the saltwater layer. In contrast, control fish (held only in freshwater) moved vertically within the water colunm when startled. Prior preference for salt water superseded the inclination to move upward in the water column when startled. Smoltification involves physiological, behavioral and morphological changes that prepare healthy chinook salmon for seawater residence. However, disease, stress and aggressive interactions can decrease the SWP of fish at this life history stage. Avoidance of salt water during estuarine outmigration is likely maladaptive, and may have ecological ramifications including increased risk of avian predation during outmigration and decreased fitness in the marine environment.

Download or read book Changes in the Swimming Performance Behavior and Physiology of Juvenile Chinook Salmon Oncorhynchus Tshawytcha After Exposure to One Two Or Three Acute Handling Stresses written by Linda A. Sigismondi and published by . This book was released on 1985 with total page 320 pages. Available in PDF, EPUB and Kindle. Book excerpt: The performance of an organism or organismic subsystem is the result of the interaction between the performance capacity of the system and Its environment. Environmental conditions can stress an organism and thus affect it's performance. In this study, three whole organism performances were examined: critical swimming speed, fatigue time and response time to a sudden bright light. In addition, subsystem performances were examined by measuring changes in hematocrit and plasma levels of cortisol, glucose, lactic acid, osmolarity, sodium and potassium. Performance tests were made on juvenile chinook salmon stressed 0, 1, 2 or 3 times, with 1 or 3 h between stresses, and on fish allowed to recover 1, 3, 6, 12 and 24 h after each level of stress. A stress consisted of holding the fish in a dip net in the air for 30 sec. The physiological responses and the swimming tests were conducted on salt water adapted fish while the behavioral response was measured with fish in fresh water. Plasma levels of cortisol, lactic acid, osmolarity and sodium increased cumulatively following several acute handling stresses spaced I h apart, though each parameter returned to control levels in 6-12 h. Plasma glucose rose significantly by 1 h after the first stress and remained higher than control levels at all levels of stress and through 24 h after stress. Plasma potassium increased initially following one and two stresses, dropped below control levels within 1-6 h after the last stress, and then increased above control levels for the remainder of the 24 h. Following three stresses potassium was lower than controls initially and then was similar to the levels for one and two stresses throughout the rest of the 24 h recovery period. There was a decrease in hematocrit 3-6 h after each level of stress followed by a return to control levels within 12 h of the last stress. Critical swimming speed was measured by increasing the water velocity in a flow-through swim tube and noting the velocity at which each fish stopped swimming. Critical swimming speeds after handling were highly variable and no differences were found between stressed fish and unstressed fish at any level of stress or any recovery time. Fatigue time was measured as the time a fish can maintain position in a swim tube at a given constant water velocity (60 cm/sec). Following each fatigue test, fish were killed and blood samples were obtained. Unlike unstressed fish, which all fatigued within13 min, the times to fatigue of stressed fish varied with some fish fatiguing within a few minutes and some fish swimming the 60 min period. There was a depression in fatigue times immediately following one and three handling stresses spaced 1 h apart. Immediately after two stresses and with all groups given time to recover from stress, fatigue times were similar to or higher than for unstressed fish. Plasma levels of cortisol, glucose, osmolarity and sodium were higher in swimming fish than in non-swimming controls. Plasma concentrations of cortisol, glucose and lactic acid were all highly variable in fish following fatigue and no differences were found betweeen fish handled in a dip net and unhandled fish at any level of stress or any time after stress. Plasma osmolarity and sodium levels in fatigued fish immediately after one stress were higher than levels in unstressed fatigued fish. Plasma potassium was higher in fatigued fish than in unstressed fatigued controls at several time periods after one and three stresses. The behavior test consisted of exposing groups of salmon in fresh water to a sudden bright light and measuring the time it took each fish to reach cover. Unstressed fish reached cover within 15 sec. Stressed fish took longer to reach cover, with the greatest delay immediately after stress and a gradual decrease in response time with recovery from stress. Exposure to two and three consecutive stress with 3 h between stresses increased the response times and the recovery times indicating that the effects of stress were cumulative.

Download or read book California Fish and Game written by and published by . This book was released on 1983 with total page 144 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Variation of Agonistic Behavior and Morphology Among Juvenile Chinook Salmon Oncorhynchus Tshawytscha of Hatchery Wild and Hybrid Origin Under Common Rearing Conditions written by Maria Elena Lang Wessel and published by . This book was released on 2004 with total page 166 pages. Available in PDF, EPUB and Kindle. Book excerpt: "Hatcheries play an important role in the enhancement of Pacific salmon (genus Oncorhynchus) as a resource, but genetic and phenotypic divergence trom wild populations may occur as a result of founder effects, genetic drift and/or domestication. In this study, agonistic behavior, ability to establish dominance, and morphology were compared among juveniles of chinook salmon (Oncorhynchus tshawytscha) that have experienced five generations of hatchery ranching culture, juveniles derived trom the wild founding stock, and second generation hybrids of the two lines. The parent generation of all lines was cultured in the same hatchery environment as the juveniles tested. Behavioral observations were conducted in replicate artificial stream tanks; hatchery and hybrid fish were significantly more aggressive than wild derived fish. No difference was detected in the ability of fish lines to win dyadic dominance contests. Thin-plate spline analysis was used to characterize morphometric variation; hatchery and wild derived juveniles differed significantly. Canonical discriminant analysis correctly classified 88% of hatchery fish and 90% of wild derived fish. Morphologically, hybrid fish were significantly different trom both hatchery and wild derived fish. These results suggest that the differences observed between lines are genetic in origin although the sources of the divergence were not conclusively identified"--Leaf iii.

Download or read book Responses of Juvenile Chinook Salmon Oncorhynchus Tshawytscha and American Shad Alosa Sapidissima to Long Term Exposure to Two vector Velocity Flows written by Robert M. Kano and published by . This book was released on 1982 with total page 30 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Author title Index to Anadromous Fisheries Branch Administrative Reports 1969 1986 written by Arthur C. Knutson and published by . This book was released on 1988 with total page 26 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Predator Avoidance Behavior of Juvenile Chinook Salmon Oncorhynchus Tshawytscha Following Crowding Stress written by Bruce H. Burton and published by . This book was released on 1990 with total page 116 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Download or read book Swimming Speeds and Distribution of Underyearling Chinook Salmon Oncorhynchus Tshawytscha in Response to Hypoxia and Simulated Riverine and Estuarine Conditions written by and published by . This book was released on 1992 with total page 56 pages. Available in PDF, EPUB and Kindle. Book excerpt: This study examines the behavioural responses of juvenile chinook salmon in riverine and vertically stratified estuarine conditions and to hypoxia within a water column simulator. Swimming speeds, schooling behaviour and distribution were quantified in relation to the simulated conditions through the analyis of time-lapse video tape recording. Temporal changes were examined by conducting a series of experiments encompassing the period of natural downstream migration, estuarine residence, and entry into sea water. This report presents data generated from these analyses together with graphical examples of the responses of underyearling salmon to the imposed conditions.

Download or read book Evaluation of Infrasound and Strobe Lights to Elicit Avoidance Behavior in Juvenile Salmon and Char written by and published by . This book was released on 1999 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt: Experimental tests were conducted using hatchery reared and wild juvenile chinook salmon Oncorhynchus tshawytscha, eastern brook trout Salvelinus fontinalis, and rainbow trout O. mykiss to determine specific behavior responses to infrasound (