Insectivore to frugivore: ontogenetic changes in gut morphology and digestive enzyme activity in the characid fish Brycon guatemalensis from Costa Rican rain forest streams

By K. Drewe, M. Horn, K. Dickson, A. Gawlicka. 2004

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Structure and function of the stomachless digestive system in three related species of New World silverside fishes (Atherinopsidae) representing herbivory, omnivory, and carnivory (2006, background): “Based on recent Wndings showing relatively high lipase activities in herbivorous species ( Drewe et al. 2004; German et al. 2004), we hypothesized that lipase activity would be highest in estuarine A. aVinis.”
Gut length and mass in herbivorous and carnivorous prickleback fishes (Teleostei: Stichaeidae): ontogenetic, dietary, and phylogenetic effects (2006, unknown): “Many herbivorous fish species appear to begin life as carnivores or omnivores and shift to a more herbivorous diet as they grow (White 1985), and their gut lengths usually increase accordingly (Montgomery 1977; Stoner and Livingston 1984; Gallagher et al. 2001; Drewe et al. 2004 ).”