Food Habits, Functional Digestive Morphology, and Assimilation Efficiency of the Rabbitfish Siganus spinus (Pisces, Siganidae) on Guam
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1975-07
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University of Hawai'i Press
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Abstract
Analyses of stomach contents of Siganus spinus showed that algal
availability and size and behavior characteristics of the fish determine what kinds
of algae are ingested in the field. Sixty-two algal species were tested during multiple choice
food preference trials in the laboratory. Elimination trials and observation
tests showed a ranked order of algal preference: (1) Enteromorpha compressa, (2)
Murrqyella periclados, (3) Chondria repens, (4) Boodlea composita, (5) Cladophoropsis
membranacea, (6) Acanthophora spicifera, and (7) Centroceras clavulatum. An: examination
of the morphology of the digestive system showed that the fish are well adapted
herbivores, especially toward the filamentous algae. The assimilation values
for the adults ranged from 6 to 39 percent; those for the juveniles ranged from 9 to
60 percent.
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Bryan PG. 1975. Food habits, functional digestive morphology, and assimilation efficiency of the rabbitfish Siganus spinus (Pisces, Siganidae) on Guam. Pac Sci 29(3): 269-277.
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