Search Results

Hepatotoxicity of Mercury to Fish

Description: Tissue samples from spotted gar (Lepisosteus oculatus) and largemouth bass (Micropterus salmoides) were collected from Caddo Lake. Gar and bass livers were subjected to histological investigation and color analysis. Liver color (as abs at 400 nm) was significantly correlated with total mercury in the liver (r2 = 0.57, p = 0.02) and muscle (r2 = 0.58, p = 0.01) of gar. Evidence of liver damage as lipofuscin and discoloration was found in both species but only correlated with liver mercury concentration in spotted gar. Inorganic mercury was the predominant form in gar livers. In order to determine the role of mercury speciation in fish liver damage, a laboratory feeding study was employed. Zebrafish (Danio rerio) were fed either a control (0.12 ± 0.002 µg Hg.g-1 dry wt), inorganic mercury (5.03 ± 0.309 µg Hg.g-1 dry wt), or methylmercury (4.11 ± 0.146 µg Hg.g-1 dry wt) diet. After 78 days of feeding, total mercury was highest in the carcass of zebrafish fed methylmercury (12.49 ± 0.369 µg Hg.g-1 dry wt), intermediate in those fed inorganic mercury (1.09 ± 0.117 µg Hg.g-1 dry wt), and lowest in fish fed the control diet (0.48 ± 0.038 µg Hg.g-1 dry wt). Total mercury was highest in the viscera of methylmercury fed zebrafish (11.6 ± 1.86 µg Hg.g-1 dry wt), intermediate in those fed inorganic diets (4.3 ± 1.08 µg Hg.g-1 dry wt), and lowest in the control fish (below limit of detection). Total mercury was negatively associated with fish length and weight in methylmercury fed fish. Condition factor was not associated with total mercury and might not be the best measure of fitness for these fish. No liver pathologies were observed in zebrafish from any treatment.
Date: August 2010
Creator: Barst, Benjamin Daniel
Partner: UNT Libraries

Ecological Studies of the Hudson River Near Indian Point

Description: "The general purpose of [this study is] to determine the ecological responses of the [Hudson] River to various classes of potential pollutants, so that the discharge of waste heat and radionuclides from the Indian Point Power Plant can be evaluated in context with these" (p. 1).
Date: April 1971
Creator: New York University. Medical Center. Institute of Environmental Medicine.
Item Type: Book
Partner: UNT Libraries

Effects of Entrainment by the Indian Point Power Plant on Biota in the Hudson River Estuary, 1973

Description: "This report summarizes the progress of studies conducted in 1973 to determine the effects on Hudson River organisms of entrainment by the Indian Point nuclear power station" with emphasis "on the potential effects of entrainment on organisms passing through the plant's condenser cooling system" (p. xxi).
Date: September 1974
Creator: New York University. Medical Center. Institute of Environmental Medicine.
Item Type: Book
Partner: UNT Institute of Applied Sciences

Effects of Entrainment by the Indian Point Power Plant on Biota in the Hudson River Estuary, March 1975

Description: "The data presented in this report represent an analysis of the abundance of four life-history stages of striped bass collected in the Hudson River at Indian Point and the intakes and discharge canal at the Indian Point Power Station" (p. 54).
Date: March 1975
Creator: New York University. Medical Center. Institute of Environmental Medicine.
Item Type: Book
Partner: UNT Libraries

Distribution, Size, Condition, and Food Habits of Selected Fishes in a Reservoir Receiving Heated Effluent from a Power Plant

Description: This study was undertaken in order to provide further insight into the effects of artificial heating on the fisheries of a small reservoir in the Southwest. The following specific objectives were established: (1) to map the reservoir for the distribution of heated water, (2) to determine the distribution of selected species of sports, rough, and forage fish in areas affected by the effluent and in areas not affected, (3) to compare size and condition of selected species of fish from areas affected by the effluent to size and condition of fish from areas not affected, and (4) to compare food habits of channel catfish in areas affected by the effluent to the food habits of channel catfish in areas not affected.
Date: December 1972
Creator: McNeely, David L.
Partner: UNT Libraries

The Response of Amphibia and Rodents to Fish Gonadotropins

Description: The purpose of this research is, first, to determine by laboratory methods, that species specificity does not exist in closely allied taxonomic animals; second, to determine a unit of activity for the gonadotropic hormone. For this purpose a quantitative method for determining potency is necessary to ascertain the seasonal production of the gonadotropic factor in fish. A further aim in this investigation is to demonstrate that the diversity of the gonadotropic factor, in relation to phylogenetic variations, is not as ineffectual as previously reported.
Date: 1949
Creator: Bishop, Jack G.
Partner: UNT Libraries

The Response of White Mice to Pituitary Gonadotropins of Fish

Description: The purpose of this experiment is to determine if immature female white mice will react to the gonadotropic hormone from the anterior pituitary of several species of fish. If they can be shown to do so, a second purpose is to establish an assay unit for this fish gonadotropin in order that it may be used with predictable results in inducing extra-seasonal spawning for fresh-water conservation practices.
Date: 1949
Creator: Doggett, Virginia Clair
Partner: UNT Libraries

Aquatic Ecological Classification and Evaluation of Streams and Stream Reaches in the Upper Roanoke River Basin, Virginia

Description: The purpose of this study is to "establish a data base and methodology for classifying...the streams of the Roanoke Basin into a hierarchy of ecological systems" and to "establish evaluative criteria and methodology for classifying and ranking streams within the ecological systems relative to their state of environmental quality" (p. R1).
Date: March 30, 1979
Creator: North Texas State University. Institute of Applied Sciences.
Item Type: Report
Partner: UNT Institute of Applied Sciences

Stock and Species Identification of Selected Marine Fishes and Shellfishes Using Allozyme Analysis and Isoelectric Focusing: Implications for Texas Fisheries Management

Description: Allozyme frequencies and general protein patterns were surveyed among selected Texas marine fishes and shellfishes to illustrate the application of biochemical genetic techniques to stock and species identification in fisheries management.
Date: May 1992
Creator: King, Timothy L. (Timothy Lee)
Partner: UNT Libraries

[Letter from Lula Dalton to Linnet Moore, April 28 - May 4, 1899]

Description: This is a letter from the Charles B. Moore Collection. It is written by Lula Dalton and is addressed to Linnet Moore. The letters are dated April 28, 1899 and May 1, 1899. In these first two letters, Lula informs Linnet of the goings-on in her community. The news includes: a discussion about her wrapper and hat, a dialogue about going riding with the White's and Lorena, and details about going to visit the Taylor family. She closes the letter by stating that she needs to read her lesson for the Club meeting and will tell her the remainder of the news soon. In Lula's next letter, dated May 3, 1899, she continues to detail the goings-on in her life and in the community. She discusses their trip to the Taylor's and notes their return trip was pleasant, notes that she stayed with Mrs. White that night because she was sick, and mentions the sewing projects she is working on at present. She closes the letter by stating that she has not yet received a letter from Linnet and hope she is not ill. Lula sends lots of love to Linnet and wishes her sweet dreams. She begins another letter on Thursday May, 4, 1899. In this brief letter, she notes that she has still not received word from Linnet and is feeling anxious about her well-being. She updates Linnet on her sewing projects and mentions that school will be out soon. She wishes that Linnet were there to go to the commencement with her. She closes the letter by sending lots of love and hopes to hear from Linnet soon. The envelope is included with the letter.
Date: April 28, 1899
Creator: Dalton, Lula
Item Type: Letter
Partner: UNT Libraries Special Collections

Fish as food.

Description: Describes the composition, cost, and nutritive value of fish and other seafoods. Includes sample menus. Discusses methods of preparing seafood for market.
Date: April 6, 1907
Creator: United States. Dept. of Agriculture.
Item Type: Book
Partner: UNT Libraries Government Documents Department

Experiment Station Work, [Volume] 39

Description: Bulletin issued by the U. S. Department of Agriculture compiling selected articles from the Agricultural Experiment Stations. This bulletin contains articles on: Improvements in Peach Growing, Mulberries, Alfalfa in the Eastern States, Oat Culture in the South, Improvement of Grass Land, Succotash as a Soiling Crop, Tankage and Bone Meal for Hogs, Grinding Corn for Hogs, Dips as Lice Killers, Digestibility of Fish and Poultry, Honey Vinegar, and the Farm Woodlot.
Date: 1907
Creator: United States. Office of Experiment Stations.
Item Type: Pamphlet
Partner: UNT Libraries Government Documents Department

Tissue-specific Bioconcentration Factor of the Synthetic Steroid Hormone Medroxyprogesterone Acetate (Mpa) in the Common Carp, Cyprinus Carpia

Description: Due to the wide spread occurrence of medroxyprogesterone acetate (MPA), a pharmaceutical compound, in wastewater effluent and surface waters, the objectives of this work were to determine the tissue specific uptake and bioconcentration factor (BCF) for MPA in common carp. BCFs were experimentally determined for MPA in fish using a 14-day laboratory test whereby carp where exposed to 100 μg/L of MPA for a 7-day period followed by a depuration phase in which fish were maintained in dechlorinated tap water for an additional 7 days. MPA concentrations in muscle, brain, liver and plasma were determined by liquid chromatography/mass spectrometry (LC/MS). The results from the experiment indicate that MPA can accumulate in fish, however, MPA is not considered to be bioaccumulative based on regulatory standards (BCF ≥ 1000). Although MPA has a low BCF value in common carp, this compound may cause reproductive effects in fish at environmentally relevant concentrations.
Date: August 2013
Creator: Steele IV, William B.
Partner: UNT Libraries

Endocrine Disruption of Levonorgestrel in Early-life Stages of Fathead Minnows, Pimephales Promelas

Description: Pharmaceuticals have routinely been detected in the environment resulting in a growing concern about whether these drugs could elicit effects on aquatic organisms. The concerns are centered on the highly conserved nature of mammalian therapeutic targets in fish. These pharmaceuticals are found at very low levels in the environment, which can result in sub-lethal effects in aquatic organisms. Therefore, 28 d early-life stage studies were conducted on six pharmaceuticals to assess their impacts on survival and growth fathead minnow larvae. Two pharmaceuticals tested, carbamazepine and fenofibrate, resulted in no alterations to survival and growth. However, amiodarone, clozapine, dexamethasone, and levonorgestrel (LNG) reduced survival at concentrations tested with LNG being the most potent at 462 ng/L. Survival was increased with amiodarone and clozapine; however LNG significantly decreased growth at 86 ng/L. Therefore, the most potent pharmaceutical tested was the synthetic progestin LNG with survival and growth impacts at concentrations less than 1 μg/L. Further analysis was conducted by measuring specific endocrine related mRNA transcript profiles in FHM larvae following the 28 d ELS exposure to LNG. Transcripts of 3β-HSD, 20β-HSD, and FSH were significantly down-regulated following 28 d exposure to both 16.3 and 86.9 ng/L LNG. Also, CYP19a expression was significantly down-regulated at 86.9 and 2392 ng/L LNG. Subsequently, a second study examined time periods that may be most sensitive (e.g., windows of sensitivity) for FHM larvae exposed to LNG. Larvae were exposed to a single concentration of LNG (i.e. LOECgrowth of 86.2 ng/L as determined in the 28 d ELS study) for different time periods starting with fertilized egg through 28 dph. Growth and mRNA expression of the four differentially expressed transcripts from the first study were measured. Regardless of the duration of exposure, LNG significantly decreased growth in fathead minnow larvae at day 28. For both 20β-HSD and CYP19a, ...
Date: August 2013
Creator: Overturf, Matthew D.
Partner: UNT Libraries

[News Script: TWC]

Description: Script from the WBAP-TV station in Fort Worth, Texas, covering a news story about Fish Week at Texas Wesleyan College in Fort Worth.
Date: October 7, 1957
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Script
Partner: UNT Libraries Special Collections

[News Script: Crew clearing lake of bad fish]

Description: Script from the WBAP-TV station in Fort Worth, Texas, covering a news story about the City of Dallas hiring a crew of commercial fishermen to clear thousands of pounds of undesirable fish species from White Rock Lake.
Date: August 13, 1954
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Script
Partner: UNT Libraries Special Collections

Recovery of the Fish Population of a Municipal Wastewater Dominated, North Texas Creek After a Major Chlorine Disturbance

Description: This study evaluated the effects of a major chlorine disturbance on fish communities in Pecan creek by the City of Denton's Pecan Creek Water Reclamation Plant. Fish communities in Pecan Creek were sampled using a depletion methodology during February, April, July, and November, 1999. February and April sampling events showed that the fish communities were severely impacted by the chlorine. Sampling during July and November showed fish communities recovered in Pecan Creek. The first-twenty minutes of shocking and seining data were analyzed to mirror an equal effort methodology. This methodology was compared to the depletion methodology to see if the equal effort methodology could adequately monitor the recovery of Pecan Creek after the chlorine disturbance. It was determined that the equal effort methodology was capable of monitoring the recovery of Pecan Creek, but could not accurately represent the fisheries community as well as the depletion method. These data using the twenty-minute study were compared to a previous study. Results of this study were similar to those found in a previous study, although fish communities were more severely impacted and took longer to recover.
Date: August 2002
Creator: Maschmann, Gerald F.
Partner: UNT Libraries

[News Script: Spitting fish]

Description: Script from the WBAP-TV/NBC station in Fort Worth, Texas, covering a news story about a spitting fish arriving at the James R. Record aquarium in Fort Worth's Forest Park Zoo.
Date: November 20, 1957
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Script
Partner: UNT Libraries Special Collections

[News Script: Fish]

Description: Script from the WBAP-TV/NBC station in Fort Worth, Texas, covering a news story about a missing shipment of fish being left to rot in Dallas.
Date: May 8, 1958
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Script
Partner: UNT Libraries Special Collections

[News Script: Fish Lured to Doom by Sneaky Turtle]

Description: Script from the WBAP-TV station in Fort Worth, Texas, covering a news story about a Mata-Mata turtle from Brazil at the James R. Record Aquarium.
Date: December 23, 1956
Creator: WBAP-TV (Television station : Fort Worth, Tex.)
Item Type: Script
Partner: UNT Libraries Special Collections