Summary
Proteolytic activity in the gut contents of two cichlids and six cyprinids from an artificial basin in Sri Lanka was measured using a simple film strip method. This comparative study contributes to our general knowledge of digestion in herbivorous fish:
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1)
Specific proteolytic activity (per ml of gut content) is lower in herbivorous than in omnivorous and carnivorous species.
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2)
Specific proteolytic activity is negatively correlated with the relative length of the gut, but the time of exposure of ingested food to proteolytic enzymes rises with increasing gut length. This results in more intensive proteolytic digestion in herbivorous fish.
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3)
Proteolytic enzymes seem to be “reabsorbed” in the hindgut of the fish. The effectiveness of this mechanism rises up to a relative gut length of 2.5–3.0. However, the small species Amblypharyngodon melletinus does not fit this relationship.
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References
Al-Hussaini AH, Kholy AA (1954) On the functional morphology of the alimentary tract of some omnivorous teleost fish. Proc Egypt Acad Scienc 12:17–39
Beynon R, Kay I (1976) Enteropancreatic circulation of digestive enzymes. Nature 260:78–79
Bradshaw RA, Neurath H, Tye RW, Walsh KA, Winter WP (1970) Comparison of the partial amino-acid sequence of dogfish trypsinogen with bovine trypsinogen. Nature (Lond.) 226:237–239
De Silva SS, Cumaranatunga PRT, De Silva CD (1980) Food, feeding ecology and morphological features associated with feeding of four co-occurring cyprinids (Pisces: Cyprinidae). Netherlands J Zool 30:54–73
Diamond JM (1978) Reabsorption of digestive enzymes: playing with poison. Nature 271:111–112
Fischer Z, Lyakhnovich VP (1973) Biology and bioenergetics of grass carp (Ctenopharyngodon idella Val.). Pol Arch Hydrobiol 20:521–557
Fish GR (1960) The comparative activity of some digestive enzymes in the alimentary canal of Tilpia and Perch. Hydrobiol 15:161–179
Gates FL (1927) A method for proteolytic enzyme, titration. Proc Soc Exp Biol Med 24:936
Hofer R, Rettenwander R, Forstner H (1981) Duration of gut passage and its dependence on temperature and food consumption in roach (Rutilus rutilus). J Fish Biol (in print)
Kapoor BG, Smit, H, Verighina IA (1975) The alimentary canal and digestion in teleosts. Adv Mar Biol 13:109–239
Kawai S, Ikeda S (1972) Studies on digestive enzymes of fishes —II Effect of dietary changes on the activities of digestive enzymes in carp intestine. Bull Jap Soc Sci Fish 38:265–270
Maltzahn cited by Barrington EJW (1957) The alimentary canal and digestion. In: ME Brown (ed) The physiology of fishes: 1 109–161 Academic Press, New York
Matthes H (1963) A comparative study on the feeding mechanisms of some African cyprinids. Bijdr Dierk 33:3–35
Mironova NN (1974), cited by Fischer Z Selected problems of fish bioenergetics. Proc World Symp Finfish Nutr Fishfeed Technol Hamb 1:17–44
Mukhopadhyay PK (1977) Studies on the enzymatic activities related to varied pattern of diets in the air-breathing cat fish, Clavias batrachus (Linn.). Hydrobiol 52:235–237
Nagase G (1964) Contribution to the physiology of digestion in Tilapia mossambica (Peters): digestive enzymes and the effects of diets on their activity. Z Vergl Phys 49:270–284
Moriarty DJW, Moriarty CM (1973) The assimilation of carbon from phytoplankton by two herbivorous fishes: Tilapia nilotica and Haplochromis nigripinnis. J Zool Lond 171:41–55
Niederholzer R, Hofer R (1979) The adaptation of digestive enzymes to temperature, season and diet in roach Rutilus rutilus L. and rudd Scardinius erythrophthalmus L. Cellulase. J Fish Biol 15:411–416
Prejs A, Blaszczyk M (1977) Relationship between food and cellulase activity in freshwater fishes. J Fish Biol 11:447–452
renade SS, Kewalramani HG (1967) Studies on the rate of food passage in fish intestines. FAO Fish Rep 44:349–358
Schiemer F (1982) Parakrama Samudra Project — Sri Lanka, a tropical lake ecosystem study. Verh Internat Verein Limnol 21
Stickney RR, Shumway SE: (1974) Occurrence of cellulase activity in the stomachs of fishes. J Fish Biol 6:779–790
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This investigation was carried out within the framework of Parakrama-Samudra-Limnology Project (Publ. No. 4), sponsored by the “Österreichischen Bundeskanzleramt”, the UNESCO and the “Österreichischen Bundesministerium für Wissenschaft und Forschung”
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Hofer, R., Schiemer, F. Proteolytic activity in the digestive tract of several species of fish with different feeding habits. Oecologia 48, 342–345 (1981). https://doi.org/10.1007/BF00346492
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DOI: https://doi.org/10.1007/BF00346492