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First published online January 19, 2006
Journal of Experimental Biology 209, 504-509 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02019
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Early rearing environment impacts cerebellar growth in juvenile salmon

Rebecca L. Kihslinger* and Gabrielle A. Nevitt

Section Neurobiology, Physiology and Behavior, UC Davis, Davis CA, USA


Figure 1
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  		Fig. 1. Anatomy of the salmonid brain. (A) The four subdivisions measured: olfactory bulb (OB), telencephalon (TE), optic tectum (OT) and cerebellum (CE). (B) A representative histological thin section cut through the cerebellum at the vertical line indicated in A. Scale bar, 1 mm.

 

Figure 2
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  		Fig. 2. Effects of rearing environment on locomotory behavior and relative cerebellar size. (A) Locomotory behavior. `Movement index' indicates the number of moving fish m2/experimental day. (B) Relative cerebellar volume (cerebellar volume/total brain volume) between treatments. Asterisks indicate statistical significance between treatments P<0.01.

 

Figure 3
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  		Fig. 3. Effects of river and laboratory (complex and simple) rearing environments on the relative cerebellar volume of steelhead alevins. Relative cerebellar volume is expressed as cerebellar volume/total brain volume. Asterisk indicates statistically significant difference between the simple and river and simple and complex treatments P<0.01.

 

Figure 4
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  		Fig. 4. Variation in the early rearing environment may determine the trajectory for brain growth. The dashed curve describes brain growth in structurally complex captive rearing environments. The solid curve describes brain growth in simple captive rearing environments. Our data suggest that different rearing conditions during the alevin life-stage produce different developmental trajectories with respect to relative brain growth.

 

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© The Company of Biologists Ltd 2006