A New Species of Myxozoan (Myxosporea) from the Brain and Spinal Cord of Rainbow Trout (Oncorhynchus mykiss) from Idaho

The author showed to the Society a small entire specimen of the P. gladius, and next described, from a larger opened and dissected one, and from part of an adult fish, the spinal cord, the brain, the organs of the senses, and other parts of its nervous system. He illustrated his remarks by exhibiting four large drawings and nine smaller ones, including six microscopic views, explanatory of his description of the structure and disposition of the spino-cerebral axis, the encephalon as viewed from above and below, the ramifications of the encephalic nerves, and more particularly the structures subserving the senses of smell, sight, and hearing.

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Magnetic Discrimination Learning in Rainbow Trout (Oncorhynchus mykiss)

Journal of Navigation ◽

10.1017/s0373463397007595 ◽

1998 ◽

Vol 51 (1) ◽

pp. 35-45 ◽

Cited By ~ 8

Author(s):

Cordula V. Haugh ◽

Michael M. Walker

Keyword(s):

Magnetic Field ◽

Rainbow Trout ◽

Oncorhynchus Mykiss ◽

Field Intensity ◽

Magnetic Field Intensity ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Magnetic Sense ◽

Presence And Absence ◽

External Stimuli ◽

A New Species

Although conditioning techniques are the most powerful way to study behavioural responses by animals to external stimuli, the magnetic sense has proved surprisingly resistant to conditioning approaches. This study demonstrated learned discrimination of magnetic field intensity stimuli by a new species, the rainbow trout (Oncorhynchus mykiss). In a unitary conditioned discrimination technique, four juvenile rainbow trout were trained to strike a target at the end of a response bar in anticipation of food. In successive experiments, the trout failed to discriminate the presence and absence of a vibration stimulus, but subsequently learned to discriminate the presence and absence of a magnetic field intensity anomaly (peak intensity of 75 μTesla). The authors conclude that the necessary conditions for training animals to magnetic intensity are the use of spatially distinctive stimuli and of a conditioned response that requires movement.

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Effect of slaughter by removal from water on visual evoked activity in the brain and reflex movement of rainbow trout (Oncorhynchus mykiss)

Veterinary Record ◽

10.1136/vr.128.19.443 ◽

1991 ◽

Vol 128 (19) ◽

pp. 443-446 ◽

Cited By ~ 26

Author(s):

S. Kestin ◽

S. Wotton ◽

N. Gregory

Keyword(s):

Rainbow Trout ◽

Oncorhynchus Mykiss ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Reflex Movement ◽

Evoked Activity ◽

The Brain ◽

Visual Evoked

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Antioxidant responses and plasma biochemical characteristics in the freshwater rainbow trout, Oncorhynchus mykiss, after acute exposure to the fungicide propiconazole

Czech Journal of Animal Science ◽

10.17221/35/2010-cjas ◽

2011 ◽

Vol 56 (No. 2) ◽

pp. 61-69 ◽

Cited By ~ 20

Author(s):

Z.-H. Li ◽

V. Zlabek ◽

J. Velíšek ◽

R. Grabic ◽

J. Machová ◽

...

Keyword(s):

Oxidative Stress ◽

Rainbow Trout ◽

Oncorhynchus Mykiss ◽

Control Group ◽

Antioxidant Responses ◽

Stress Indices ◽

Rainbow Trout Oncorhynchus Mykiss ◽

Plasma Enzymes ◽

Plasma Characteristics ◽

The Brain

In this study, the toxic effects of PCZ, a triazole fungicide present in aquatic environment, were studied in rainbow trout, Oncorhynchus mykiss, by an acute toxicity test. Compared to the control group, fish exposed to PCZ (96-h-LC50, 5.04 mg/l) showed significantly higher (P < 0.05) plasma NH3 and GLU concentration and the activities of plasma enzymes including CK, ALT, AST, LDH, but the TP content was not significantly different (P > 0.05). The oxidative stress indices (levels of LPO and CP) of brain and muscle in the experimental group were higher compared to the control group, especially for a significant change (P < 0.05) in the brain. SOD, CAT, GPx and GR activity in the brain of experimental groups was significantly lower (P < 0.05), however, an opposite tendency was found out in muscle. In addition, there are significant correlations between TBARS and CAT, TBARS and GPx, CP, and CAT, GR, and GPx in the fish brain. Thus, PCZ exposure changed the oxidative stress indices and plasma characteristics, and these changes may be used as potential bioindicators of the exposure and effect of PCZ in the controlled experiment. The use in monitoring of PCZ exposure under natural field conditions is possible, but it needs further investigations.

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