Acute toxicity of hydrogen sulfide to fish during harvesting operations on commercial catfish farms :

Simple item page
dc.contributor.authorTorrans, Eugene Leslie,en_US
dc.date.accessioned2013-08-16T12:28:14Z
dc.date.available2013-08-16T12:28:14Z
dc.date.issued1980en_US
dc.description.abstractUnconsumed fish food apparently resulted in the high sulfide concentrations seen near the feeding area in May or June and September of both years. Dissolved sulfide concentrations decreased near the feeding area in July and August, when the water temperatures were over 28(DEGREES)C and the fish consumed nearly all of the food given. The direct effect of unconsumed food on dissolved sulfide was limited to the vicinity of the feeding area.en_US
dc.description.abstractThe highest dissolved sulfide concentrations found at shoreline areas 80 meters from the feeding area occurred in September, and apparently resulted from the die-offs and deposition of phytoplankton. At those areas, the highest sulfide concentrations were at the location that was sheltered from the wind, and where the deposition of suspended matter was the greatest.en_US
dc.description.abstractHydrogen sulfide dissolved in the interstitial water of the sediment of commercial catfish culture ponds in Oklahoma was measured from February, 1978, through November, 1979.en_US
dc.description.abstractSulfide-inhibited cytochrome oxidase recovered rapidly in vivo. Brain cytochrome oxidase rose from a 50% inhibition to control levels after six hours at 10(DEGREES)C. The recovery rate was similar in both the brain and gill.en_US
dc.description.abstractA measurable reduction in cytochrome oxidase activity was seen after exposure of fish to 0.1 mg/l H(, 2)S at 10(DEGREES)C for only five minutes. Exposure of channel catfish to 0.5 mg/l H(, 2)S at 20(DEGREES)C resulted in hyperpnea, followed by apnea, and finally respiratory arrest. When exposed to 0.1 mg/l H(, 2)S at 20(DEGREES)C for 30 minutes, the cytochrome oxidase activity of the brain was inhibited 40% and that of the gill was inhibited 74%, while blood lactate rose from 11.6 to 38.1 mg/100 ml.en_US
dc.description.abstractMortalities of fish resulting from exposure to hydrogen sulfide on commercial fish farms can be avoided by; (1) reducing dissolved sulfide concentrations in the sediment through pond design, improved feeding practices, and the use of lime in the ponds, (2) landing fish in areas of the ponds with lower sulfide concentrations, (3) treating the water with potassium permanganate during harvesting to oxidize the sulfide in the water, (4) reducing the physical exertion of the fish after sub-lethal exposure to H(, 2)S, and (5) allowing for short-term recovery before transportation.en_US
dc.description.abstractHydrogen sulfide competitively inhibited cytochrome oxidase. The enzyme was inhibited in vitro 18% by 10('-7) M H(, 2)S, 64% by 10('-6) M, and 100% by 10('-4) M.en_US
dc.description.abstractThe maximum concentration of sulfide in the sediment was less than 1.2 mg(.)liter('-1) from December through February, and was as high as 18.1 mg(.)liter('-1) in the warmer weather. The maximum sulfide concentration usually occurred from 5.7 to 12.8 cm below the surface of the sediment from December through February, and within the top two centimeters of the sediment from July through September.en_US
dc.format.extentxi, 123 leaves :en_US
dc.identifier.urihttp://hdl.handle.net/11244/4785
dc.noteSource: Dissertation Abstracts International, Volume: 41-06, Section: B, page: 1995.en_US
dc.subjectAgriculture, Animal Culture and Nutrition.en_US
dc.thesis.degreePh.D.en_US
dc.thesis.degreeDisciplineDepartment of Biologyen_US
dc.titleAcute toxicity of hydrogen sulfide to fish during harvesting operations on commercial catfish farms :en_US
dc.typeThesisen_US
ou.groupCollege of Arts and Sciences::Department of Biology
ou.identifier(UMI)AAI8027533en_US

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
8027533.PDF
Size:
2.13 MB
Format:
Adobe Portable Document Format
Download

Collections

OU - Dissertations