Pearl dace

Tsai, C.F. 1979. Survival, overturning and lethal exposure times for the pearl dace, Semotilus margaritus (Cope), exposed to copper solution. Comp. Biochem. Physiol. 64C l-6. 

In addition to behavior changes, exposure to the alarm odor also has physiological effects. For instance, in pearl dace, Semotilus margarita, the levels of plasma cortisol and glucose increase 15 minutes after the alarm and are back to normal after 5 hours. The brain concentrations of dopamine, norepinephrine, 5-hydroxytryptamine, or tryptophan did not change (Rehnberg et al., 1987). The fish recovered physiologically much sooner than the behavioral activation For example. Von Frisch (1941) observed that minnows avoided the site of their encounter with alarm substance for many hours, even days. 

Pearl dace Semotiltis margarita Both sexes Alarm pheromone ll Plasma cortisol, glucose Rehnberg etal., 1987... 

Rehnberg, B. G., Smith, R. J. F., and Sloley, B. D. (1987). The reaction of pearl dace (Pisces, Cyprinidae) to alarm pheromone time-course of behavior, brain amines and stress physiology. Canadian Journal of Zoology 65,2916-2921. 

The pearl or northern dace Semotilus margarita) is a widespread species that is especially important in brown-colored, boggy waters. The fallfish (S. corporalis) occurs in northeastern North America, and can grow as large as 18 in (45 cm), and is sometimes eaten by people. 

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