Effect of different densities of live and dead Chlorella vulgaris on the population growth of rotifers Brachionus calyciflorus and Brachionus patulus (Rotifera)
Por:
Lucía-Pavón E., Sarma S.S.S., Nandini S.
Publicada:
1 ene 2001
Resumen:
In order to maintain rotifer populations during periods of low algal production, it is necessary to offer alternate diets, some of which include forms of preserved algae. The present work is based on the effect of live and dead Chlorella vulgaris on the population growth of Brachionus calyciflorus and Brachionus patulus. The experimental design consisted of three algal levels (0.5×106, 1.5×106 and 4.5×106 cells ml-1) offered in three forms (living frozen and heat-killed). The maximal population density values for B. calyciflorus ranged from 55±1 ind. ml-1 (at 0.5×106 cells ml-1) to 471±72 ind. ml-1 (at 4.5×106 cells ml-1) with live Chlorella, but was much lower (6±1 to 26±6 ind. ml-1) with frozen or heat-killed alga under comparable food levels. However, the maximum population density of B. patulus under live or or heat-killed Chlorella was similar at comparable algal levels but when offered frozen algae it was four times less. The highest mean peak population density was 1 227±83 ind. ml-1 under 4.5×106 cells ml-1. The rate of population increase for B. calyciflorus varied from 0.50 to 0.79 using live Chlorella, but under comparable conditions, this range was lower (0.21 to 0.31) for B. patulus. Results have been discussed in light of possible application for aquaculture.
Filiaciones:
Lucía-Pavón E.:
Lab. de Zool. Acuática, Div. de Invest. y Posgrado, Univ. Nac. Auton. de México, Tlalnepantla, Edo. de México, Mexico
Sarma S.S.S.:
Lab. de Zool. Acuática, Div. de Invest. y Posgrado, Univ. Nac. Auton. de México, Tlalnepantla, Edo. de México, Mexico
Nandini S.:
Div. de Invest. y Posgrado, Proyecto CyMA, Univ. Nac. Auton. de México, Tlalnepantla, Edo. de México, Mexico
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