One behavioral trait is the common use, by parental fish, of the body and pectoral fins for stirring the substrate, with the purpose of uncovering small edible matter for the fry.
Pairs look for a hidden solid surface to lay their eggs, something that would be an easy chore on the river, but not on this habitat, where stones are scarce and sometimes not located in the more protected areas, so many times the underpart of a water lilie leave take their place.
The Verde and Santa María rivers, from an altitude of 1000 meters over sea level to the their merging point (99°14',21°38'N.LAT.), and down the resulting Tampaón river until a geographical barrier in the form of an underground passage through the ridge it seems to prevent their access downwards.
The neighborhood is swampy and malarial, Tampico has two important railway connections: the Monterrey and Gulf line running N.N.W. to Ciudad, Victoria and Monterrey, and a branch of the Mexican Central running westward to San Luis Potosi.
There is also a line of river boats on the Panuco running up to the mouth of the Tamazunchale about 135 m., and another running to Tamiahua on the lagoon of that name by way of the Tuxpam canal, about 77 m.
The depth of water at the wharves varies from 18 to 25 ft. The exports include silver bullion (from San Luis Potosi, Aguascalientes, Torreon and Monterrey), ixtle fibre, sugar, hides, live cattle, cotton-seed cake, deer skins, honey, fustic, sarsaparilla, coffee, rubber, broom-root, copper ores and asphalt.
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