The Behavior of Brook Trout Embryos From the Time of Hatching to the Absorption of the Yolk Sac
The Behavior of Brook Trout Embryos From the Time of Hatching to the Absorption of the Yolk Sac
White, Gertrude Marean
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: : 7 : I 2 21 days: : 10 : :7.7 candle; ; meters ; : 8 • 21 days: : 10 :16 candle : ; meters : 8 ; : 2 Totals : ; 85 » « ; 62 ' ; 6 NiimlDer of : trout in- ; different : : Percent of : I trout nega-: : tive : ; Percent of : : trout posi-: : tire ; : Percent of trout , indifferent 11 : : 1 : 56;; ; : : ; 44^ 2 : : 84^ ; ; e% : ; e>% 1 : : 80^ ; t ! \ 20% 1 ! : 70^ ; \ ZOfo \ ; 10^ 2 ; t 80^ ; : i \ 20^ ; : 80^ : i 20^ : \ 17 : 15% : ! S% : 17,^ Totals Digitized by Google Digitized by Google In ...the experim.ents tabulated the trout were placed in the center of the dish with right and left sides alternately toward the light , so as to eliminate complication from a propensity to turn toward a particxilar side of the body. Each fish was observed for five minutes* The strengths of the lights given are approximately what the fish actually encountered in the center of the dish* It may be noted that a somewhat greater percentage reacted negatively to a light 2*3 candlemeters than to a light 1«5 csuidlemeters* Above 2*3 candlemeters, however, the increase in the strength of light seems to make little difference* Brook Trout less than a week old in general react more strongly to a weak light (2«3 candlemeters) than to a strong one (16 candlemeters}* With the older fish this does not seem to be true* The conclusion that young Brook Trout larvae are negatively phototropic was corroborated by other incidental observations* mfhen a dish containing fish was placedbefore a window they almost invariably sought the side of the dish away from the light* The same was true of the Rainbow Trout* In order to discover whether a Brook Trout is photo- kinetic, a Nernst lamp was suspended about eighteen inches above a dish containing them* TOien the light was first turned on, the trout darted about vigorously, many seeking the corners of the dish* After a few minutes e^gposure.
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