Date of Award
Spring 1986
Document Type
Thesis
Degree Name
Master of Science (MS)
Department
Biological Sciences
Program/Concentration
Biology
Committee Director
Ray S. Birdsong
Committee Member
Raymond W. Alden, III
Committee Member
James F. Matta
Committee Member
Fred Singleton
Call Number for Print
Special Collections LD4331.O35O78
Abstract
Fishes from the industrialized environs of the Elizabeth River, Virginia were surveyed for external evidence of disease during June through October 1984. A highly significant (p < 0.001) incidence of disease was found in demersal fishes collected by otter trawl from a site in the industrially contaminated Southern Branch compared to a less contaminated Western Branch site. Cataracts, fin erosion and dermal lesions were the most commonly occurring anomalies in the Southern Branch finfish.
Static, solid-phase toxicity tests employing sediment collected from the Southern Branch site resulted in an immediate toxic stress in the spot, Leiostomus xanthurus, which resulted in 100% mortality within 24 hours, compared with no mortalities in control systems. Spot exposed to control, i.e., pollution free, and diluted Southern Branch sediments innoculated with the pathogenic bacterial species, Vibrio anguillarium, developed significant (p ≤ 0.020) cases of fin erosion at a mean total bacterial community density of ≥ 2.4 x 107 cells/ml. No significant cases of fin erosion were produced in fishes exposed to control and diluted Southern Branch sediments without V. anguillarium. A significantly higher (p = 0.05) total bacterial density developed in the diluted Southern Branch sediments compared with the control sediment.
It is hypothesized that the industrially contaminated Southern Branch sediment favors development of populations of bacteria such as V. anguillarium which are pathogenic to fishes inhabiting this system. Furthermore, an increase in the incidence of disease in fishes from the Southern Branch may be the result of large populations of pathogenic bacteria and industrial pollution stress.
Rights
In Copyright. URI: http://rightsstatements.org/vocab/InC/1.0/ This Item is protected by copyright and/or related rights. You are free to use this Item in any way that is permitted by the copyright and related rights legislation that applies to your use. For other uses you need to obtain permission from the rights-holder(s).
DOI
10.25777/q1dr-fx64
Recommended Citation
Owen, Randal D..
"Urbanization and Environmental Change in the Lynnhaven Estuary"
(1986). Master of Science (MS), Thesis, Biological Sciences, Old Dominion University, DOI: 10.25777/q1dr-fx64
https://digitalcommons.odu.edu/biology_etds/387
Included in
Environmental Indicators and Impact Assessment Commons, Oceanography Commons, Terrestrial and Aquatic Ecology Commons