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The fatal abalone disease named withering syndrome (WS), caused by a Rickettsiales-like prokaryote classified as Xenohaliotis californiensis, has been treated by injections and oral administration of oxytetracycline (OTC) with relatively successful results. These therapeutic treatments have practical limitations for their application in aquacultural and experimental facilities due to the inability to eat of severely ill organisms, and the need to incorporate the antibiotic in pelletized food, increasing production costs. During an experiment to determine the effect of photoperiod and temperature on the growth of juvenile blue abalone Haliotis fulgens, some animals showed overt symptoms of WS. Oxytetracycline baths at 400 mg L–1 were used for one hour daily during seven days to treat diseased animals. The metabolic rate of one group of these organisms was also assessed. Recovery time (time for an organism to regain the upright position) and size were assessed on days 0, 14, and 29. By the third day of treatment, most treated animals regained a limited adhesion capacity, and began to ingest food and to produce feces. After one week, more than 50% of the treated abalone were capable of regaining the upright position within the first 10 min of being turned upside down. After 30 days all organisms showed strong adhesion to the substrate. Metabolic rate declined from 380 (initially) to 280 microliters O2 ind–1 h–1 after two weeks of treatment. This study opens the door for further research on the use of OTC baths for practical use in abalone culture and management.   La enfermedad mortal conocida como sindrome de deshidratacion (SD), causada por un organismo procariota del tipo Rickettsiales clasificado como Xenohaliotis californiensis, ha sido tratada con exito relativo mediante inyecciones y la administracion oral de oxitetraciclina (OTC). Estos tratamientos terapeuticos tienen limitaciones practicas para su aplicacion en instalaciones acuiculturales y experimentales debido a la incapacidad de los organismos severamente enfermos para alimentarse y a la necesidad de incorporar el antibiotico en alimento peletizado, aumentando asi los costos de produccion. Durante un experimento para determinar el efecto del fotoperiodo y la temperatura sobre el crecimiento de jovenes del abulon azul Haliotis fulgens, algunos animales mostraron sintomas del SD. Para el tratamiento de los animales enfermos se utilizaron banos de OTC a 400 mg L–1 durante una hora diaria por siete dias. Tambien se cuantifico la tasa metabolica de un grupo de estos organismos. El tiempo de recuperacion (tiempo para que un organismo volteado recupere su posicion correcta) y la talla fueron evaluados a los 0, 14 y 29 dias. Al tercer dia del tratamiento la mayoria de los animales recuperaron una capacidad limitada de adhesion, y comenzaron a ingerir alimento y a producir heces. Despues de una semana, mas del 50% de los abulones tratados recuperaron su posicion normal en los primeros 10 min despues de haber sido volteados. Despues de 30 dias, todos los organismos mostraron una capacidad fuerte de adhesion. La tasa metabolica disminuyo de 380 (inicial) a 280 microlitros O2 ind–1 h–1 despues de dos semanas de tratamiento. El presente estudio abre la puerta para realizar investigaciones posteriores sobre el uso y manejo practico de banos de OTC en el cultivo de abulon.

Oxytetracycline water bath treatment of juvenile blue abalone Haliotis fulgens (Philippi 1845) affected by the withering syndrom