SciELO - Scientific Electronic Library Online

 
vol.80 issue4Dental anomalies in Dromiciops gliroides (Microbiotheria, Microbiotheriidae), Caenolestes fuliginosus and Rhyncholestes raphanurus (Paucituberculata, Caenolestidae)Fish community structure in San Agustín Bay, Huatulco, Mexico author indexsubject indexarticles search
Home Pagealphabetic serial listing  

Services on Demand

Journal

Article

Indicators

Related links

  • On index processCited by Google
  • Have no similar articlesSimilars in SciELO
  • On index processSimilars in Google

Share


Revista chilena de historia natural

Print version ISSN 0716-078X

Abstract

DUARTE, FREDDY; IBANEZ, CHRISTIAN M  and  CHONG, JAVIER. Changes in mouth morphometries as related to the diet of Thyrsites atun (Euphrasen, 1791) from south-central Chile. Rev. chil. hist. nat. [online]. 2007, vol.80, n.4, pp.407-417. ISSN 0716-078X.  http://dx.doi.org/10.4067/S0716-078X2007000400002.

In several species of carnivorous fishes, as they grow, body size and that of the mouth are related positively with prey size, however, the number and biomass of preys consumed by the fish don't present such a clear pattern. To verify these relationships in the fish Thyrsites atun, a total of 140 individuals were collected from industrial and semi-industrial landings in south-central Chile. The diet of T. atun was described by means of frequency, number and weight of preys, which were compared between sub-adult and adult fishes. We also measured mouth morphometry to compare them with the fish size and prey size. Mouth volume was also calculated to relate it with the number and weight of the ingested preys. Four prey species were found in their digestive tracts, Euphausia sp., Todarodes filippovae, Strangomera bentincki and Engraulis ringens, the latter being the most frequent prey (99.9 %). The mouth measures were dependent of predator body size. Equally, prey size turned out to be dependent of predator size, as well as of the mouth measures. Also, mouth volume was related positively with predator body size, and the number and the weight of the prey items were correlated with mouth size and volume. Thyrsites atun feeds in the neritic area on small fishes that live in schools. As size of T. atun increases so would increase the size of preys, and consequently when the mouth volume increases so does the quantity and biomass of prey items

Keywords : Thyrsites atun; mouth morphometrics; body size, feeding; fish schools.

        · abstract in Spanish     · text in Spanish     · Spanish ( pdf )

 

Creative Commons License All the contents of this journal, except where otherwise noted, is licensed under a Creative Commons Attribution License