Efectos del perifiton sobre los parámetros fisicoquímicos del agua en estanques con policultivo de tilapia Oreochromis niloticus y Bocachico Prochilodus magdalenae
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Date
2012
Journal Title
Journal ISSN
Volume Title
Publisher
Corporación Universitaria Lasallista
Abstract
Introduction. Pisciculture is an important activity to
satisfy the alimentary necessities of a growing population.
Therefore, it is necessary to develop environmentally
responsible techniques. Cultivation based
on periphyton is attractive, because it can feed the
fish and improve the quality of the water, allowing
a more efficient and cleaner system. Objective. To
evaluate the effect of periphyton on some of the quality
parameters of the water used for the cultivation of
Nile-bocachico tilapia fish. Methodology. An experiment
was performed during eight months in eighteen
90 m2 ponds with 2.7 tilapia fish per square meter
and 0.7 bocachicos per square meter, with no fertilization.
As a periphyton substract, vertical plastic
pipes were installed (3.3 pipes/m2) and their presence
or absence was an evaluated factor. Additionally, three feeding strategies were evaluated: 0 (no food),
feeding with 20% of raw protein (RP) and feeding
with 25% of RP. A 2x3 factorial design was used. The
six treatments of the resulting factorial experiment
were assigned to the experimental units based on a
random design with three repetitions. Every day the
dissolved oxygen, the pH, the transparency and the
temperature were measured. Same thing was made
every two weeks for the total ammonium, the nitrite
and the phosphate. Every month, alkalinity and total
thickness were measured, as well. Results. No
effects of the use of substrata were found (p>0.05) for
the development of periphyton on dissolved oxygen,
phosphates and thickness. Effects of this factor (B)
were found (p<0.05) on temperature, transparency,
pH, ammonium and nitrite. Conclusion. Given the
ecologic complexity of these polycultivation systems
based on periphyton, the results obtained suggest
the necessity of continuing the research work.
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Keywords
Corporación Universitaria Lasallista, Tilapia (Oreochromis Niloticus), Bocachico (prochilodus magdalenae), Perifiton, Piscicultura, Piscicultura - Estudios