Hydrobiologia

, Volume 449, Issue 1–3, pp 249–252 | Cite as

Feeding activity of Callinectes ornatus Ordway, 1863 and Callinectes danae Smith, 1869 (Crustacea, Brachyura, Portunidae) in Ubatuba, SP, Brazil

  • Alvaro Luiz Diogo Reigada
  • Maria Lucia Negreiros-Fransozo
Article

Abstract

The feeding activity along the day cycle and the time consumed for extracellular digestion were evaluated in the portunids C. ornatus and C. danae. Swimming crabs were obtained from trawling in Ubatuba bay, São Paulo, Brazil, during both the rainy and dry seasons. In each season, daily scheduled samples were taken at dawn (±6 h), noon (±12 h), dusk (±18 h) and midnight (±24 h). All individuals were dissected and the degree of stomach replenishment was recorded. In order to estimate the time elapsed for extracellular digestion, crabs were fed, and groups were dissected at 30 min intervals to check the conditions of their stomachs. In general, both species show a higher feeding activity during periods of lower light intensity, as evidenced by an increased percentage of full stomachs in dusk and midnight samples. The obtained results support higher feeding activity at night in these species and indicate short time for extracellular digestion, not exceeding 8 h. Nevertheless, full stomachs were recorded in all sampling schedules. In this case, it should be considered that elimination of certain food items such as fish bones, mollusk shells and carapace fragments of crustaceans could take more time than other items. Additionally, some crab species could require a cycle of cell replacement in the midgut gland epithelium until they can take their next meal.

Portunidae Callinectes diel rhythms feeding activity swimming crabs 

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Copyright information

© Kluwer Academic Publishers 2001

Authors and Affiliations

  • Alvaro Luiz Diogo Reigada
    • 1
    • 2
  • Maria Lucia Negreiros-Fransozo
    • 3
  1. 1.Câmpus do Litoral Paulista, Praça Infante D. Henrique s/nUNESPSão Vicente, SPBrazil
  2. 2.NEBECC (Group of Studies on Crustacean Biology, Ecology and Culture) Depto. de ZoologiaInstituto de Biociências - UNESPBotucatu (SP)Brazil
  3. 3.NEBECC (Group of Studies on Crustacean Biology, Ecology and Culture) Depto. de ZoologiaInstituto de Biociências - UNESPBotucatu (SP)Brazil

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