Diagnóstico morfométrico del rotífero Brchionus plicatilis (Müller 1786), con variables indicadoras "dummy"

The use of living feed in quculture depends on severl fcators, one of them is the sie, wich determine its efficincy to be predated. If the prey size not correspond to predator needs, the probbility to be consumed is low, and the growth and survival rates of the predator will be affected. The aim of this work ws to get  potentil morphometric model, using dummy variables, relating the length and width of Brachionus plicatilis from different strains; Thailand-S, Yashima-S, Yashima-L nad Nagasaki-L. The eperimentl organisms were cultured under the same controlled environmental conditions. In order to demostrate the model usefulness, the trditionla model of length vs. width was done to select the best fit. The results indicate high correlations in both methods from 0.895 to 0.961 with the trdaitional way and 0.95 with the proposed wy. The grphic analysis of residuals demostrate the high fidelity of the model presented here. The use of this model is important because it works with one nominal variable and simplify the calculations without loss its precision.