%0 Journal Article
%T Population dynamics of Brachionus calyciflorus (Rotifera: Brachionidae) in waste water from food-processing industry in Mexico
%A Raymundo Alfredo Ar谷valo Stevenson
%A S.S.S. Sarma
%A S. Nandini
%J Revista de Biolog赤a Tropical
%D 1998
%I Universidad de Costa Rica
%X Waste water from Mexico's largest food processing industrial sector (based on maize, nejayote water) was used for growing Brachionus calyciflorus isolated from Lake Chapultepec in the Federal District of Mexico (D.F.). Nejayote water was collected from Colonia Providencia, D.F. Experiments were conducted at 25∼C in 25 ml capacity vials with 20 ml of medium into which we introduced B. calyciflorus at an initial density of 1 ind ml-1. The experimental design consisted a total of 33 test vessels (2 food combinations X 5 densities X 3 replicates = 30 plus 3 replicates as controls that contained only algae). Experiments were terminated after day 16. Waste water in original concentration did nt rotifes. However, when diluted to 5 oncentrations (ranging from 2% to 32% and pH adjusted to 7.0), rotifer density increased with increasing concentration of waste water. Green algae (at constant density of 2 X 10 6 cells-1 of Chlorella) in combination with waste water resulted in a higher abundance of rotifers only at higher concentration (above 8 %) of waste water. The maximum peak density of rotifers (238-50 ind ml -1) was obtained at 16% dilution of waste water nd with addition of Chlorella. The rate of population increase per day   (mean-SD) varied from 0.355-0.059 to 0.457-0.048 depending on food combination and concetration. Se us車 aguas de desecho de la industria de la masa y la tortilla (aguas de nixtamal o nejayote) para crecer rot赤feros de agua dulce, Brachionus calyciflorus. El nejayote sin diluci車n no permiti車 el desarrollo del rot赤fero. Sin embargo, cuando se diluy車, B. calyciflorus aprovech車 la materia org芍nica. El agua de desecho por s赤 misma (sin alimento algal adicional) fue comparable al agua con densidades del alga Chlorella de 2 X 10(6) c谷lulas ml-1. Concentraciones de nejayote por encima del 8% no permitieron el crecimiento poblacional. Sin embargo, la presencia de alga permiti車 el desarrollo del rot赤fero a concentraciones de 8% y 16%. Nuestros hallazgos indican que el nejayote puedo ser utilizado de manera efectiva para la producci車n de rot赤feros a gran escala para la acuacultura.
%K Rotifer
%K Brachionus
%K waste water
%K population growth
%K Mexico
%U http://www.scielo.sa.cr/scielo.php?script=sci_arttext&pid=S0034-77441998000300013