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First published online July 20, 2006
Journal of Experimental Biology 209, 2929-2938 (2006)
Published by The Company of Biologists 2006
doi: 10.1242/jeb.02329
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Metabolic organization and effects of feeding on enzyme activities of the dogfish shark (Squalus acanthias) rectal gland

Patrick J. Walsh1,2,*, Makiko Kajimura2,3, Thomas P. Mommsen2,4 and Chris M. Wood2,3

1 Rosenstiel School of Marine and Atmospheric Science, University of Miami, 4600 Rickenbacker Causeway, Miami, FL 33149, USA
2 Bamfield Marine Sciences Centre, Bamfield, British Columbia, Canada
3 Department of Biology, McMaster University, 1280 Main Street West, Hamilton, Ontario L8S 4K1, Canada
4 Department of Biology, University of Victoria, Victoria, British Columbia, Canada


Figure 1
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  		Fig. 1. Plasma concentrations of metabolites at various times post-feeding in dogfish shark (Squalus acanthias). (A) ß-hydroxybutyrate; values are means ± s.e.m. (N=7-14 per time point). (B) Acetoacetate; values are means ± s.e.m. (N=6 per time point). (C) Glucose; values are means ± s.e.m. (N=7-14 per time point). Different letters above the bars indicate significant differences (P<0.05).

 

Figure 2
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  		Fig. 2. Activities of ß-hydroxybutyrate dehydrogenase (BHDBH; µmol min-1 g-1) in various tissues at various times post-feeding in dogfish shark (Squalus acanthias). Values are means ± s.e.m. (N=3-12 per time point). L, liver; M, muscle; G, gill; I, intestine; R, rectal gland; E, esophagus; S1, anterior stomach; S2, posterior stomach; B, brain and K, kidney. NB kidney samples were taken only from starved fish and at 48 h post-feeding. Increases in activity in rectal gland at all times post-feeding were significantly different from that of starved fish (P<0.05). Significant changes in enzyme activities for other tissues are indicated by an asterisk (P<0.05).

 

Figure 3
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  		Fig. 3. Activities of malic enzyme (ME; µmol min-1 g-1) in various tissues at various times post-feeding in dogfish shark (Squalus acanthias). Values and symbols as in Fig. 2. Significant changes in enzyme activities are indicated by an asterisk (P<0.05).

 

Figure 4
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  		Fig. 4. Activities of NADP-isocitrate dehydrogenase (ICDH; µmol min-1 g-1) in various tissues at various times post-feeding in dogfish shark (Squalus acanthias). Values and symbols as in Fig. 2. Significant changes in enzyme activities are indicated by an asterisk (P<0.05).

 

Figure 5
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  		Fig. 5. Activities of citrate synthase (CS; µmol min-1 g-1) in rectal gland at various times post-feeding in dogfish shark (Squalus acanthias). Values and symbols as in Fig. 2 (N=5-12 per time point). Different letters above the bars indicate significant differences (P<0.05).

 

Figure 6
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  		Fig. 6. Activities of lactate dehydrogenase (LDH; µmol min-1 g-1) in various tissues at various times post-feeding in dogfish shark (Squalus acanthias). Values and symbols as in Fig. 2. Significant changes in enzyme activities are indicated by an asterisk (P<0.05).

 

Figure 7
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  		Fig. 7. Activities of Na+/K+ ATPase (µmol ADP mg-1 protein h-1) in rectal gland at various times post-feeding in dogfish shark (Squalus acanthias). Values and symbols as in Fig. 4 (N=5-11 per time point). Different letters above the bars indicate significant differences (P<0.05).

 




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