Importance of biofilm as food source for shrimps (Farafantepenaeus paulensis) evaluated by stable isotopes (∂13C and ∂15N)

Research output: Contribution to journalArticle

Abstract

Abstract
The contribution of biofilm and artificial feeds for the growth of the pink shrimp Farfantepenaeus paulensis reared in tanks and net cages were evaluated by using stable isotope (δ13C and δ15N) analysis. In the net cage experiment, mass balance and mixing equations showed that the biofilm contribution to shrimp growth was over 49% of carbon and 70% of nitrogen. These data suggest that the artificial feed offered in this experiment, although ingested, was not properly incorporated in the shrimp tissue. In contrast, biofilm growing in tanks contributed little to the nitrogen incorporated by the shrimp (maximum of 29%). In this experiment, shrimp presented an unusually large isotope fractionation. These results imply that the shrimp are selectively ingesting some items from the biofilm, or differentially assimilate specific items of the artificial feed, due to differential digestibility. The hypothesis of selective feeding of biofilm microorganisms was corroborated in the experiment with net cages, where shrimp preferentially consumed centric diatoms. This study also demonstrated that shrimp biofilm consumption and the presence of artificial feed largely influenced biofilm formation. The consumption of centric diatoms by shrimp seem to stimulate biofilm chlorophyll-a, while biofilm δ15N values measured in tanks indicate that microorganisms present in the biofilm absorbs nitrogen released by artificial feed after its decomposition.

Details

Authors
  • Paulo Cesar Abreu
  • Eduardo L. C. Ballester
  • Clarisse Odebrecht
  • Wilson Wasielesky Jr.
  • Ronaldo O. Cavalli
  • Wilhelm Granéli
  • Alexandre M. Anesio
Organisations
Research areas and keywords

Subject classification (UKÄ) – MANDATORY

  • Ecology

Keywords

  • stable isotopes, microorganisms, feeding, biofilm, shrimp
Original languageEnglish
Pages (from-to)88-96
JournalJournal of Experimental Marine Biology and Ecology
Volume347
Issue number1-2
Publication statusPublished - 2007
Publication categoryResearch
Peer-reviewedYes