Open AccessContribution of microorganisms to the biofilm nutritional quality: protein and lipid contents
Author(s) -
FERNANDES da SILVA C.,
BALLESTER E.,
MONSERRAT J.,
GERACITANO L.,
WASIELESKY JR W.,
ABREU P.C.
Publication year - 2008
Publication title -
aquaculture nutrition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.941
H-Index - 79
eISSN - 1365-2095
pISSN - 1353-5773
DOI - 10.1111/j.1365-2095.2007.00556.x
Subject(s) - biology , biofilm , microorganism , cyanobacteria , food science , dry weight , heterotroph , chlorophyll , bacteria , chlorophyll a , algae , botany , microbiology and biotechnology , genetics
The nutritional quality of biofilm, a microbial community associated to an organic matrix, was evaluated in artificial substrate (polyethylene screen) in net cages during 30 days in the Patos Lagoon estuary, Southern Brazil. During this period, samples of biofilm were collected each 5 days for analysis of chlorophyll a , microorganisms abundance, dry weight, protein and lipid contents. During the study, chlorophyll a varied from 0.38 to 2.75 μg cm −2 ; dry weight between 7.16 and 17.63 mg cm −2 ; protein content from 0.43 to 1.76 mg cm −2 and lipid concentration between 1.21 and 4.23 mg cm −2 . The variation of lipid in the biofilm was closely related to the abundance of free heterotrophic bacteria (34.25–56.54 × 10 6 cells cm −2 ), filamentous cyanobacteria (7.5–15.9 × 10 6 filaments cm −2 ), flagellates (6.92–12.89 × 10 6 cells cm −2 ) and mainly nematodes (29–1,414 organisms cm −2 ), while protein content varied similarly to the abundance of unicellular centric diatoms (52.10–179.81 × 10 3 cells cm −2 ), and nematodes. This information will allow a better management of food supply to raised aquatic organism with the utilization of natural productivity in the culture systems, with considerable decrease in production costs.