Diversidad del Perifiton presente en un sistema de producción de tilapia en Biofloc
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Date
2016
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Abstract
Introduction. Periphyton is comprised of a complex
community of aquatic organisms that get attached
to underwater substrates, is a crucial component
of the aquatic biotic communities and contributes
to the understanding of these ecosystems. Some
variations in the biofloc´s quality in raw protein
and polyunsaturatted fatty acids levels terms can
DOI: 10.22507/rli.v13n2a15 be conditioned mainly by periphyton´s structure.
Objective. Determine the composition, abundance
and diversity rates of periphyton in the different
treatments for cultivating tilapia fish in biofloc.
Materials and methods. Five samples of a tilapia fish
culture in biofloc, associated to three treatments with
their respective controls during a six months period,
were taken. An inverted microscope with a camera
was used to mount and count the sample (Sedgwick-
Rafter camera). To determine and compose the
assembly, taxonomic keys were used, and the species´
diversity, dominance, richness and equity rates
were estimated. To calculate the diversity rate and
the grouping scheme, the Biodiversity-Professional
(Version 2) and PAST (Version 2.17c) softwares
were used. Results. The assembly was comprised
of 15 taxa. Eurotatoria was the most representative
in taxa richness terms. The most abundant species
was Crucigenia fenestrata. The sampling developed
in different months of the year showed differences
concerning the population density and the number
of taxa found. The diversity rates oscilated between
0,3428 bel nat/ind and 0,7357 bel nat/ind. For the
equity, values close or above 1 were found, and
values under 0, 8 were also found as treatment 2
and the taxa richness showed a regularity between
treatments. Conclusion. Periphytic microalgae
represent one of the communities with the highest
space variability in terms of biomass and composition,
but none of the species maintain a considerable size
of its population throughout the year, partly because
of the disturbances in the treatments, which make
them change their structure.