Parasites of juvenile pompano from Galveston Island, Texas and preliminary trials of four chemicals for ectoparasitic activity : a thesis /
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| Format: | Thesis Book |
| Language: | English |
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[College Station, Tex.] :
[Texas A&M University],
[1974]
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| Subjects: |
| Abstract: | ABSTRACT: A study was conducted to determine the parasitic fauna of juvenile pompano from Galveston Island, Texas. The parasites with the greatest pathogenic potential were identified and four chemicals were tested for efficacy against these parasites. Seventy-five pompano were examined for internal and external parasites. Internal parasites recovered were Pseudohurleytrema eucinostomi, Lobatostoma sp., two larval cestodes which were both classifed as Scolex polymorphus and a larval nematode Raphidascaris sp. The internal parasites were causing little or no damage to the host at this stage of pompano development. External parasites recovered were Bicotylophora trachinoti, Trichodina sp., Scyphidia sp. and Oodinium sp. With the exception of Scyphidia sp., each of these ectoparasites had the capability of causing irritation and damage to the gills when present in moderate to heavy numbers. Preliminary tests were conducted with four chemicals for activity against ectoparasites. Test dosages of Trichlorfon (Dylox), acetic acid and salicylic acid proved to be either ineffective against ectoparasites or caused serious side effects in the fish tested. A concentration of formalin of 150 parts per million for 1 hour was the minimum test dosage which showed good activity against Bicotylophora trachinoti, Trichodina sp. and Scyphidia sp. and which caused no serious side effects. Bacterial cultures were taken from five different groups of pompano. The types of organisms which were isolated varied widely between groups. The bacteria isolated were Aeromonas formicans, A. shigelloides, Enterobacter cloacae, Pseudomonas alcaligenes, P. denitrificans, P. piscidida, P. sp., Vibrio anguillarum, V. fuscus, V. marinopraesens and V. marinovulgaris. Aeromonas formicans was isolated with the greatest frequency while Pseudomonas denitrificans and Vibrio anguillarum were isolated with moderate frequency from the external body surfaces. Vibrio anguillarum was incriminated as the causitive agent of a disease outbreak which occurred in pompano being held in laboratory aquaria during June 1974. Symptoms and treatment are discussed. In vitro antibiotic susceptibility tests performed on the bacterial species isolated showed that Gentamycin and Chloramphenicol had the broadest ranges of efficacy against these bacteria. |
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| Item Description: | Vita. "Major Subject: Veterinary Parasitology". "Submitted to the Graduate College of Texas A&M University in partial fulfillment of the requirement for the degree of Master of Science December 1974". |
| Physical Description: | xii, 67 leaves : illustrations ; 29 cm |
| Bibliography: | Includes bibliographical references. |