If you are experiencing problems downloading PDF or HTML fulltext, our helpdesk recommend clearing your browser cache and trying again. If you need help in clearing your cache, please click here . Still need help? Email email@example.com
Background. The examination of morphological features related to feeding in fish, as well as the irrelation with body length, are of increasing scientific interest. In the present study, information on intestine (gut) morphometrics that appear in the relevant literature has been
compiled, analysed, and discussed. Materials and Methods. Search of gut-related bibliography was conducted, using online literatured at a bases on fish feeding and ecomorphology. The resulted data was tabulated. Relationships between mean, minimum, and maximum relative gut length
(RGL) and intestine length weight index (ILW, Zihler's index), as provided by the original author, with species' fractional trophic levels (TROPHs; extracted from Fish Base) were explored. Finally, using the relations between gut length (GL) and body length (L) provided by the original
authors, regressions were reconstructed and compared based on species' feeding habits and taxonomy. Results. The amount of information related to gut morphometrics referred to 498 species. The relations between GL and L referred to 71 species, but four species were omitted
from the analyses. Mean, minimum, and maximum RLG and ILW values were negatively related (for all cases: P < 0.01) with TROPH. The GL–L regressions performed for 67 species revealed the presence of two major groups as herbivorous fishes and carnivorous fishes. Grouping
according to species' taxonomic order did not form any significant groupings. Conclusion. Existing information on intestine morphometrics is generally accumulated in a few scientific papers. All the analyses performed on the compiled data reinforced the pattern generally accepted
that herbivores have longer intestines than carnivores. In addition, the influence of species' evolutionary history on comparisons of gut length between species with different feeding habits was not verified. Finally, equations relating RGL and ILW to TROPH can be used for TROPH value estimates
from morphological data that are easy to obtain, especially in the lack of species' feeding habits data.
ACTA ICHTHYOLOGICA ET PISCATORIA (AI&P) is an international, peer-review scientific journal that publishes articles based on original experimental data or experimental methods, or new analyses of already existing data, in any aspect of ichthyology and fisheries (fin-fish only).