Pamela J Schofield, Ph.D. (Former Employee)
Science and Products
Filter Total Items: 56
Salinity tolerance of the African Jewelfish Hemichromis letourneuxi, a non-native cichlid in South Florida (USA)
The African Jewelfish (Cichlidae: Hemichromis letourneuxi) is a predatory, non-native fish that has recently (since 2000) begun to expand its geographic range across south Florida. The salinity tolerance of H. letourneuxi was unknown, and thus it was unclear whether the species could use estuarine or coastal environments. The response of H. letourneuxi to chronic change in salinity was evaluated h
Authors
Jacqueline N. Langston, Pamela J. Schofield, Jeffrey E. Hill, William F. Loftus
Epizootic ulcerative syndrome caused by Aphanomyces invadans in captive bullseye snakehead Channa marulius collected from south Florida, USA
Epizootic ulcerative syndrome (EUS) caused by the oomycete Aphanomyces invadans is an invasive, opportunistic disease of both freshwater and estuarine fishes. Originally documented as the cause of mycotic granulomatosis of ornamental fishes in Japan and as the cause of EUS of fishes in southeast Asia and Australia, this pathogen is also present in estuaries and freshwater bodies of the Atlantic an
Authors
Ryan K. Saylor, Debra L. Miller, Mark W. Vandersea, Mark S. Bevelhimer, Pamela J. Schofield, Wayne A. Bennett
Aggressive interactions between the invasive Rio Grande cichlid (Herichthys cyanoguttatus) and native bluegill (Lepomis macrochirus), with notes on redspotted sunfish (Lepomis miniatus)
The Rio Grande cichlid (Herichthys cyanoguttatus) has been established in the Greater New Orleans Metropolitan area for at least 20 years, and its effect on native fishes is unknown. Behavioral trials were performed to determine if aggressive interactions occur between invasive H. cyanoguttatus and native bluegill (Lepomis macrochirus). When defending a territory as the resident, L. macrochirus we
Authors
O. Thomas Lorenz, Martin T. O' Connell, Pamela J. Schofield
Field guide to the nonindigenous marine fishes of Florida
No abstract available.
Authors
Pamela J. Schofield, James A. Morris, Lad Akins
Geographic extent and chronology of the invasion of non-native lionfish (Pterois volitans [Linnaeus 1758] and P. miles [Bennett 1828]) in the Western North Atlantic and Caribbean Sea
The Indo-Pacific lionfishes (Pterois volitans [Linnaeus 1758] and P. miles [Bennett 1828]: Family Scorpaenidae) are the first non-native marine fishes to establish in the Western North Atlantic. The chronology of the invasion is reported here using records from the US Geological Survey's Nonindigenous Aquatic Species database. Currently, lionfish are established off the Atlantic coast of the USA f
Authors
Pamela J. Schofield
Salinity tolerance of non-native Asian swamp eels (Teleostei: Synbranchidae) in Florida, USA: Comparison of three populations and implications for dispersal
Three populations of non-native Asian swamp eels are established in peninsular Florida (USA), and comprise two different genetic lineages. To assess potential for these fish to penetrate estuarine habitats or use coastal waters as dispersal routes, we determined their salinity tolerances. Swamp eels from the three Florida populations were tested by gradual (chronic) salinity increases; additionall
Authors
P. J. Schofield, L.G. Nico
Salinity effects on behavioural response to hypoxia in the non-native Mayan cichlid Cichlasoma urophthalmus from Florida Everglades wetlands
This study quantified the hypoxia tolerance of the Mayan cichlid Cichlasoma urophthalmus over a range of salinities. The species was very tolerant of hypoxia, using aquatic surface respiration (ASR) and buccal bubble holding when oxygen tensions dropped to <20 mmHg (c. 1??0 mg l-1) and 6 mmHg, respectively. Salinity had little effect on the hypoxia tolerance of C. urophthalmus, except that bubble
Authors
P. J. Schofield, W.F. Loftus, J.A. Fontaine
Assessment and control of an invasive aquaculture species: An update on Nile tilapia (Oreochromis niloticus) in coastal Mississippi after Hurricane Katrina
We provide information about the effects of Hurricane Katrina on populations of an invasive fish, the Nile tilapia (Oreochromis niloticus) in southern Mississippi. By resampling areas surveyed before the storm, we attempted to determine whether the species expanded its range by moving with storm-related floods. Additionally, we used rotenone to eradicate individuals of this species at a hurricane-
Authors
Pamela J. Schofield, W. Todd Slack, Mark S. Peterson, Denise R. Gregoire
Hypoxia tolerance of two centrarchid sunfishes and an introduced cichlid from karstic Everglades wetlands of southern Florida, U.S.A.
In this study, the hypoxia tolerance of three Everglades fishes, two native centrarchids (Lepomis gulosus and Lepomis marginatus) and a recently introduced cichlid (Hemichromis letourneuxi), were documented. Aquatic surface respiration (ASR) thresholds were lowest for H. letourneuxi, followed by L. gulosus, then L. marginatus. The ASR thresholds for L. marginatus were within ranges reported for sm
Authors
P. J. Schofield, W.F. Loftus, M.E. Brown
Toxicity of 5% rotenone to nonindigenous Asian swamp eels
Our primary goal was to determine whether rotenone would be a useful control against introduced populations of Asian swamp eels (family Synbranchidae, genus Monopterus). We report the results of a laboratory experiment comparing the efficacy of various rotenone concentrations (1, 2, 4, and 8 mg of 5% liquid rotenone/L of water) in killing nonindigenous swamp eels of various sizes (1-350 g) from th
Authors
P. J. Schofield, L.G. Nico
Salinity tolerance of goldfish, Carassius auratus, a non-native fish in the United States
No abstract available.
Authors
Pamela J. Schofield, Mary E. Brown, Pamela L. Fuller
Foreign Nonindigenous Carps and Minnows (Cyprinidae) in the United States - A Guide to their Identification, Distribution, and Biology
No abstract available.
Authors
Pamela J. Schofield, James D. Williams, Leo G. Nico, Pamela L. Fuller, Matthew R. Thomas
Non-USGS Publications**
Schofield, P.J. & D.H. Huge. 2011. Low-temperature tolerance of two non-native fishes (Hoplosternum littorale [Hancock 1828], Cichlasoma bimaculatum [Linnaeus 1758]) established in Florida. Florida Scientist 74: 73-83.
Schofield, P.J. & L.J. Chapman. 1999. Interactions between Nile perch, Lates niloticus, and other fishes in Lake Nabugabo, Uganda. Environmental Biology of Fishes 55(4): 343-358.
Schofield, P.J. & G.H. Burgess. 1997. Etmopterus robinsi: A new species of deep-water dogshark (Elasmobranchii, Etmopteridae) from the Caribbean and Western Atlantic with a redescription of E. hillianus. Bulletin of Marine Science 60(3): 1060-1073.
Kolar, C. and P. Schofield. 2009. Early detection and rapid response for nonnative marine fishes. Fisheries and Aquatic Bulletin (USGS) 9:7-9.
Schofield, P.J. 2003. Factors affecting the distribution and densities of two gobies (Microgobius gulosus and Gobiosoma robustum) in a lagoonal estuarine system (Florida Bay, USA). Doctoral dissertation, Department of Biological Sciences, University of Southern Mississippi.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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Science and Products
Filter Total Items: 56
Salinity tolerance of the African Jewelfish Hemichromis letourneuxi, a non-native cichlid in South Florida (USA)
The African Jewelfish (Cichlidae: Hemichromis letourneuxi) is a predatory, non-native fish that has recently (since 2000) begun to expand its geographic range across south Florida. The salinity tolerance of H. letourneuxi was unknown, and thus it was unclear whether the species could use estuarine or coastal environments. The response of H. letourneuxi to chronic change in salinity was evaluated h
Authors
Jacqueline N. Langston, Pamela J. Schofield, Jeffrey E. Hill, William F. Loftus
Epizootic ulcerative syndrome caused by Aphanomyces invadans in captive bullseye snakehead Channa marulius collected from south Florida, USA
Epizootic ulcerative syndrome (EUS) caused by the oomycete Aphanomyces invadans is an invasive, opportunistic disease of both freshwater and estuarine fishes. Originally documented as the cause of mycotic granulomatosis of ornamental fishes in Japan and as the cause of EUS of fishes in southeast Asia and Australia, this pathogen is also present in estuaries and freshwater bodies of the Atlantic an
Authors
Ryan K. Saylor, Debra L. Miller, Mark W. Vandersea, Mark S. Bevelhimer, Pamela J. Schofield, Wayne A. Bennett
Aggressive interactions between the invasive Rio Grande cichlid (Herichthys cyanoguttatus) and native bluegill (Lepomis macrochirus), with notes on redspotted sunfish (Lepomis miniatus)
The Rio Grande cichlid (Herichthys cyanoguttatus) has been established in the Greater New Orleans Metropolitan area for at least 20 years, and its effect on native fishes is unknown. Behavioral trials were performed to determine if aggressive interactions occur between invasive H. cyanoguttatus and native bluegill (Lepomis macrochirus). When defending a territory as the resident, L. macrochirus we
Authors
O. Thomas Lorenz, Martin T. O' Connell, Pamela J. Schofield
Field guide to the nonindigenous marine fishes of Florida
No abstract available.
Authors
Pamela J. Schofield, James A. Morris, Lad Akins
Geographic extent and chronology of the invasion of non-native lionfish (Pterois volitans [Linnaeus 1758] and P. miles [Bennett 1828]) in the Western North Atlantic and Caribbean Sea
The Indo-Pacific lionfishes (Pterois volitans [Linnaeus 1758] and P. miles [Bennett 1828]: Family Scorpaenidae) are the first non-native marine fishes to establish in the Western North Atlantic. The chronology of the invasion is reported here using records from the US Geological Survey's Nonindigenous Aquatic Species database. Currently, lionfish are established off the Atlantic coast of the USA f
Authors
Pamela J. Schofield
Salinity tolerance of non-native Asian swamp eels (Teleostei: Synbranchidae) in Florida, USA: Comparison of three populations and implications for dispersal
Three populations of non-native Asian swamp eels are established in peninsular Florida (USA), and comprise two different genetic lineages. To assess potential for these fish to penetrate estuarine habitats or use coastal waters as dispersal routes, we determined their salinity tolerances. Swamp eels from the three Florida populations were tested by gradual (chronic) salinity increases; additionall
Authors
P. J. Schofield, L.G. Nico
Salinity effects on behavioural response to hypoxia in the non-native Mayan cichlid Cichlasoma urophthalmus from Florida Everglades wetlands
This study quantified the hypoxia tolerance of the Mayan cichlid Cichlasoma urophthalmus over a range of salinities. The species was very tolerant of hypoxia, using aquatic surface respiration (ASR) and buccal bubble holding when oxygen tensions dropped to <20 mmHg (c. 1??0 mg l-1) and 6 mmHg, respectively. Salinity had little effect on the hypoxia tolerance of C. urophthalmus, except that bubble
Authors
P. J. Schofield, W.F. Loftus, J.A. Fontaine
Assessment and control of an invasive aquaculture species: An update on Nile tilapia (Oreochromis niloticus) in coastal Mississippi after Hurricane Katrina
We provide information about the effects of Hurricane Katrina on populations of an invasive fish, the Nile tilapia (Oreochromis niloticus) in southern Mississippi. By resampling areas surveyed before the storm, we attempted to determine whether the species expanded its range by moving with storm-related floods. Additionally, we used rotenone to eradicate individuals of this species at a hurricane-
Authors
Pamela J. Schofield, W. Todd Slack, Mark S. Peterson, Denise R. Gregoire
Hypoxia tolerance of two centrarchid sunfishes and an introduced cichlid from karstic Everglades wetlands of southern Florida, U.S.A.
In this study, the hypoxia tolerance of three Everglades fishes, two native centrarchids (Lepomis gulosus and Lepomis marginatus) and a recently introduced cichlid (Hemichromis letourneuxi), were documented. Aquatic surface respiration (ASR) thresholds were lowest for H. letourneuxi, followed by L. gulosus, then L. marginatus. The ASR thresholds for L. marginatus were within ranges reported for sm
Authors
P. J. Schofield, W.F. Loftus, M.E. Brown
Toxicity of 5% rotenone to nonindigenous Asian swamp eels
Our primary goal was to determine whether rotenone would be a useful control against introduced populations of Asian swamp eels (family Synbranchidae, genus Monopterus). We report the results of a laboratory experiment comparing the efficacy of various rotenone concentrations (1, 2, 4, and 8 mg of 5% liquid rotenone/L of water) in killing nonindigenous swamp eels of various sizes (1-350 g) from th
Authors
P. J. Schofield, L.G. Nico
Salinity tolerance of goldfish, Carassius auratus, a non-native fish in the United States
No abstract available.
Authors
Pamela J. Schofield, Mary E. Brown, Pamela L. Fuller
Foreign Nonindigenous Carps and Minnows (Cyprinidae) in the United States - A Guide to their Identification, Distribution, and Biology
No abstract available.
Authors
Pamela J. Schofield, James D. Williams, Leo G. Nico, Pamela L. Fuller, Matthew R. Thomas
Non-USGS Publications**
Schofield, P.J. & D.H. Huge. 2011. Low-temperature tolerance of two non-native fishes (Hoplosternum littorale [Hancock 1828], Cichlasoma bimaculatum [Linnaeus 1758]) established in Florida. Florida Scientist 74: 73-83.
Schofield, P.J. & L.J. Chapman. 1999. Interactions between Nile perch, Lates niloticus, and other fishes in Lake Nabugabo, Uganda. Environmental Biology of Fishes 55(4): 343-358.
Schofield, P.J. & G.H. Burgess. 1997. Etmopterus robinsi: A new species of deep-water dogshark (Elasmobranchii, Etmopteridae) from the Caribbean and Western Atlantic with a redescription of E. hillianus. Bulletin of Marine Science 60(3): 1060-1073.
Kolar, C. and P. Schofield. 2009. Early detection and rapid response for nonnative marine fishes. Fisheries and Aquatic Bulletin (USGS) 9:7-9.
Schofield, P.J. 2003. Factors affecting the distribution and densities of two gobies (Microgobius gulosus and Gobiosoma robustum) in a lagoonal estuarine system (Florida Bay, USA). Doctoral dissertation, Department of Biological Sciences, University of Southern Mississippi.
**Disclaimer: The views expressed in Non-USGS publications are those of the author and do not represent the views of the USGS, Department of the Interior, or the U.S. Government.
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