Lawrence, Addison Lee2022-02-212022-02-21197317885690https://hdl.handle.net/10657/8880The oxygen consumption rates of brown shrimp (Penaeus aztecus) larvae and postlarvae were measured by manometric techniques in the absence and presence of four concentrations of an oxytetracycline-oleandomycin antibiotic combination, and the ability of these antibiotics to control bacterial populations associated with the shrimp was determined. The data suggest that the nauplial and protozoeal stages could not tolerate all four concentrations of antibiotics tested. However, brown shrimp mysis and postlarvae can tolerate all four antibiotic concentrations tested. The average initial bacterial population associated with brown shrimp nauplii is lower than that found in older stages. The average bacterial populations associated with brown shrimp protozoea, mysis and postlarvae after a one hour incubation in autoclaved seawater (ASW) was 2 x 10^6 cells/ml ambient solution. In the absence of antibiotic, the bacterial population associated with the brown shrimp larvae and postlarvae increased exponentially. In 24 hours the bacterial population can become as high as 1 x 10^18 cells/ml ambient solution. The concentration of 62.5 ng oxytetracycline (OTC) and 25 ug oleandomycin (OLE) per ml ASW has a bacteriostatic activity for 6 hours and a concentration of double this amount has a bacteriostatic activity for 6-18 hours. [...]application/pdfenThis item is protected by copyright but is made available here under a claim of fair use (17 U.S.C. §107) for non-profit research and educational purposes. Users of this work assume the responsibility for determining copyright status prior to reusing, publishing, or reproducing this item for purposes other than what is allowed by fair use or other copyright exemptions. Any reuse of this item in excess of fair use or other copyright exemptions requires express permission of the copyright holder.Thesisreformatted digital