Counts oí' viable heterotrophic bacteria. C'ihrio-like bacteria and total colilòrms were perlòrmed in sca\+ater supply. l'ood stocks and broodstock pools at tuo aquacultural facilities located in Mexico. '1 hc hiph abundance of these bacteria1 groups indicates risl\ areas that must bc monitored to control potential pathogens. such as I 'ihrio spp. I-iltering systems and food supplies, such as Artenw spp. and í'rcsh or frozen sca tòod. wre found to bc the most important sourccs oïpotcntial pathogcns. /L¿,J, wo,-tk: I'rhrio. marine bacteria. shrimp hatcheries. hatchery watcr quality. RESUMEN I:n dos laboratorios situados cn la República Mrxicana. SC rcali/.aron conteos dc bacterias hcterótrofas viables. bacterias tipo I'ibrio y coliformes totales en muestras de agua del sistema de aprovicionamiento. cn alimentos marinos y en estanques dc reproductores. Las altas concentraciones de estos grupos bacterianos indican la existencia de puntos de riesgo. los cuales deben ser vigilados sistemáticamcnte para poder controlar patógenos potenciales. tales como lïhrio spp. En cstc traba.@, se encontró que los sistemas de filtración 5 el alimento utilizado. tal como Artemio spp. y orgamsmos marinos Frescos o conpclados. son las prmcipales fuentes de patógenos potenciales en los laboratorios dc acuicultura estudiados. /~~r/&w.s C/CIW: I 'lhrco. bacterias marinas. criaderos de camarón. calidad del agua del criadero.

No abstract

A study of the comparative distribution of different types of bacterial populations in the sea area where the city of Marseille rejects its waste water shows that, when in contact with the marine environment, a great part of the allochthonic bacterial population undergoes physiological stress expressed by an abrupt reduction of the effectives and by weak values of the energetic charge. The presence of coliforms and streptococci in waste water lens, at important distances from discharging conduits, shows the possibility of a large diffusion for a fraction of the bacterial populations that withstand the initial stress. From mathematical analyses, an inverse correlation is revealed between detergents and the bacterial population as a whole, and between phenols and various allochthonic bacterial populations. The above results were evidenced through a sampling strategy based upon a 24-h-cycle study and a search for mathematical correlations between several biological, chemical, and physical parameters.