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Fish guts as chemical reactors: a model of the alimentary canals of marine herbivorous fishes

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Abstract

The alimentary canals of marine herbivorous fishes are variously composed of a few basic structures strung together in series. We model the structures where digestive processes occur as chemical reactors following the model of Penry and Jumars: the stomach as a batch or continuous-flow stirred-tank (CSTR), the intestine as a plug-flow reactor (PFR), and the hindgut caecum as a CSTR. Other structures, where food is mechanically processed-gill rakers, pharyngeal mills, and muscular stomachs-are classified as gates. The optimality criterion for the model is the digestion of the most nutrient in the least amount of time. With the model we are able to predict gut configuration as a function of nutrient concentration and hypothesize that the guts of herbivorous fishes always have a PFR component and may or may not have a CSTR component. The Penry-Jumars model appears to provide a consistent theoretical framework for four main types of digestive mechanisms in marine herbivorous fishes and offers specific testable hypotheses on the feeding ecology and digestive physiology of four representative species of fish as well as other, still unstudied, herbivorous fishes.

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Literature cited

  • Alexander, R. McN. (1991). Optimization of gut structure and diet for higher vertebrate herbivores. Phil. Trans. R. Soc. Lond. (Ser. B) 333: 249–255

    Google Scholar 

  • Ayling, T., Cox, G. J. (1982). Collin's guide to the sea fishes of New Zealand. Collins, Auckland, New Zealand

    Google Scholar 

  • Bischoff, K. B. (1966). Optimal continuous fementation reactor design. Can. J. chem. Engng 44: 281–284

    Google Scholar 

  • Clements, K. D., Bellwood, D. R. (1988). A comparison of the feeding mechanisms of two herbivorous labroid fishes, the temperate Odax pullus and the tropical Scarus rubroviolaceus. Aust. J. mar. Freshwat. Res. 39: 87–107

    Google Scholar 

  • Collins, M. R. (1981). The feeding periodicity of striped mullet, Mugil cephalus L., in two Florida habitats. J. Fish Biol. 19: 307–315

    Google Scholar 

  • Dade, W. B., Jumars, P. A., Penry, D. L. (1990). Supply-side optimization: maximizing absorptive rates. In: Behavioural mechanisms of food selection. Springer Verlag, London, p. 531–556

    Google Scholar 

  • Edwards, T. W., Horn, M. H. (1982). Assimilation efficiency of a temperate-zone intertidal fish (Cebidichthys violaceus) fed diets of macroalgae. Mar. Biol. 67: 247–253

    Google Scholar 

  • Horn, M. H. (1989). Biology of marine herbivorous fishes. Oceanogr. mar. Biol. A. Rev. 27: 167–272

    Google Scholar 

  • Horn, M. H., Murray, S. N., Edwards, T. W. (1982). Dietary selectivity in the field and food preferences in the laboratory for two herbivorous fishes (Cebidichthys violaceus and Xiphister mucosus) from a temperate intertidal zone. Mar. Biol. 67: 237–246

    Google Scholar 

  • Hume, I. D., Sakaguchi, E. (1991). Patterns of digesta flow and digestion in foregut and hindgut fermenters. In: Tsuda, T., Sasaki, Y., Kawashima, R. (eds.) Physiological aspects of digestion and metabolism in ruminants. Academic Press, San Diego. p. 427–451

    Google Scholar 

  • Jumars, P. A., Penry, D. L. (1989). Digestion theory applied to deposit feeding. In: Lopez, G., Taghon, G., Levinton, J. (eds.) Ecology of marine deposit feeders. Springer Verlag, New York, p. 115–128

    Google Scholar 

  • Lobel, P. S. (1981). Trophic biology of herbivorous reef fishes: alimentary pH and digestive capabilities. J. Fish Biol. 19: 365–397

    Google Scholar 

  • Moriarty, D. J. W. (1976). Quantitative studies on bacteria and algae in the food of the mullet Mugil cephalus L and the prawn Metapenaeus bennettae (Racek and Dall). J. exp. mar. Biol. Ecol. 22: 131–143

    Google Scholar 

  • Odum, W. W. (1970). Utilization of the direct grazing and plant detritus food chains by the striped mullet Mugil cephalus. In: Steele, J. H. (ed.) Marine food chains. University of California Press, Berkeley, p. 222–240

    Google Scholar 

  • Payne, A. I. (1978). Gut pH and digestive strategies in estuarine grey mullet (Mugilidae) and Tilapia (Cichlidae). J. Fish Biol. 13: 627–629

    Google Scholar 

  • Penry, D. L., Jumars, P. A. (1986). Chemical reactor analysis and optimal digestion. BioSci. 36: 310–315

    Google Scholar 

  • Penry, D. L., Jumars, P. A. (1987). Modeling animal guts as chemical reactors. Am. Nat. 129: 69–96

    Google Scholar 

  • Press, W. H., Fannery, B. P., Teukolsky, S., Vetterling, W. T. (1986). Numerical recipes: the art of scientific computing. Cambridge University Press, Cambridge

    Google Scholar 

  • Ralston, S. L., Horn, M. H. (1986). High tide movements of the temperate-zone herbivorous fish Cebidichthys violaceus (Girard) as determined by ultrasonic telemetry. J. exp. mar. Biol. Ecol. 98: 35–50

    Google Scholar 

  • Rimmer, D. W., Wiebe, W. J. (1987). Fermentative microbial digestion in herbivorous fishes. J. Fish Biol. 31: 229–236

    Google Scholar 

  • Russell, B. C. (1983). The food and feeding habits of rocky reef fish of north-eastern New Zealand. N. Z. Jl mar. Freshwat. Res 17: 121–145

    Google Scholar 

  • Sibly, R. M. (1981). Strategies of digestion and defecation. In: Townsend, C. R., Calow, P. (eds.) Physiological ecology, an evolutionary approach to resource use. Sinauer Associates, Sunderland, Massachusetts, p. 109–139

    Google Scholar 

  • Smith, R. L., Paulson, A. C. (1974). Food transit times and gut pH in two Pacific parrotfishes. Copeia 1974: 796–799

    Google Scholar 

  • Thomson, J. M. (1954). The organs of feeding and the food of some Australian mullet. Aust. J. mar. Freshwat. Res. 5: 469–485

    Google Scholar 

  • Urquhart, K. A. F. (1984). Macroalgal digestion by Cebidichthys violaceus, a temperate marine fish with highly acidic stomach fluids. M. A. thesis. California State University, Fullerton, California

    Google Scholar 

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Communicated by M. G. Hadfield, Honolulu

Contribution No. 68 from the Ocean Studies Institute, Long Beach, California 90840, USA

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Horn, M.H., Messer, K.S. Fish guts as chemical reactors: a model of the alimentary canals of marine herbivorous fishes. Marine Biology 113, 527–535 (1992). https://doi.org/10.1007/BF00349695

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