In fish consumption advisories pertaining to Hg, grouper species in the family Serranidae are oft... more In fish consumption advisories pertaining to Hg, grouper species in the family Serranidae are often lumped together and labeled generically as Grouper. However, grouper species vary considerably in growth rate, maximum age, and maximum size. This study examined the variability of Hg concentrations and bioaccumulation rates (increase of Hg concentrations in relation to age) for populations of three long-lived, slow-growing, protogynous hermaphrodite grouper species, gag Mycteroperca microlepis, scamp M. phenax, and red grouper Epinephelus morio, which are commercially and recreationally important in the offshore waters of the US southeastern region. A total of 268 samples from the three grouper species were processed for Hg analysis from 2013–2015. Concentrations of Hg ranged from 0.03 to 0.87 ppm wet weight, with a mean of 0.30 ppm. Gag accumulated Hg at a faster rate (as measured by the increase of Hg with fish age) than the other two species. Size, age, and δ15N were significant predictors for Hg in the two Mycteroperca species, while size and age were significant predictors for Hg in red grouper. Two of the three species had mean Hg concentrations within the one meal per week “Good Choices” consumption category (red grouper and scamp), and one species (gag) had a mean Hg level within the two meals per week “Good Choices” consumption category as advised by the US EPA and US FDA. These results support the separation of grouper species in advisories.
Mercury (Hg) concentrations and nitrogen (d 15 N) and carbon (d 13 C) stable isotopic ratios were... more Mercury (Hg) concentrations and nitrogen (d 15 N) and carbon (d 13 C) stable isotopic ratios were measured to assess differences in Hg bioaccumulation in four predatory fish species (Mycteroperca microlepis, Lutjanus campechanus, Caulolatilus microps, and Serioli dumerili) of high commercial and recreational importance in Atlantic waters of the southeastern US. Positive relationships existed between Hg and length, weight, and age, for all species, strongest for M. microlepis and L. campechanus. Intraspecific Hg concentrations also strongly correlated with d 15 N for all species, and d 13 C for only L. campechanus, and S. dumerili. Comparisons of stable isotopes between species and their impact on mean Hg concentration were inconclusive. This study is the first to report Hg concentrations for C. microps. The current study provides data for an under-sampled region, explores how feeding ecology impacts Hg uptake in commonly co-occurring fishes, and raises questions of the importance of sex and reproduction in Hg accumulation for marine fishes.
Fishes are an integral part of diets around the world, with approximately one billion people rely... more Fishes are an integral part of diets around the world, with approximately one billion people relying on fishes for their main source of protein. Eating fish provides an array of nutritional benefits; however the emerging concern of mercury exposure from the consumption of fish has led to much controversy concerning risks versus benefits. For this reason, studies measuring the mercury concentrations in commonly caught and consumed fish are an important part in relaying useful information to the public. But, care must be taken when issuing region- and nation-wide advisories for fish species or groups in which Hg data are only documented from one area for a wide-ranging species or from a small sample of individuals within a species. For example, in the mid-2000s, South Carolina fishers expressed confusion and concern about the FDA, EPA and SCDHEC “DO NOT EAT” advisory for “tilefish” (as an aggregate group) that was based on data from 1971 of 60 golden tilefish (Lopholatilus chamaeleont...
199 AbStract.-Sagittae (n=2,263) and gonads (n=870) from snowy grouper, Epinephelus niveatus, cau... more 199 AbStract.-Sagittae (n=2,263) and gonads (n=870) from snowy grouper, Epinephelus niveatus, caught primar-ily with longlines, Kali poles, snapper reels, and chevron traps off North Caro-lina and South Carolina were examined 1) to compare growth rates, population ...
Porous composite cathodes containing (La0.8Sr0.2)0.98MnO3 (LSM) and yttria stabilized zirconia (Y... more Porous composite cathodes containing (La0.8Sr0.2)0.98MnO3 (LSM) and yttria stabilized zirconia (YSZ) for use in solid oxide fuel cells (SOFCs) have been produced by air plasma spraying. Deposition was carried out using axial powder injection for increased deposition efficiency and composition control. A number of composite cathodes were produced using different combinations of parameter values within the identified range. Successful coatings were then characterized for composition and porosity using EDX and SEM. As a result of these tests, combinations of input parameter values were identified that are best suited to the production of coatings with microstructures appropriate for use in SOFC composite cathodes.
... Gary S. Groenewold,1∗ Marnie M. Cortez,1 Anita K. Gianotto,1 Garold L. Gresham,1 John E. Olso... more ... Gary S. Groenewold,1∗ Marnie M. Cortez,1 Anita K. Gianotto,1 Garold L. Gresham,1 John E. Olson,1 Robert V. Fox,1 Byron ... an indoor environment is important for assessing the potential for human exposure, time required to clear, and time available for effective sam-pling and ...
In fish consumption advisories pertaining to Hg, grouper species in the family Serranidae are oft... more In fish consumption advisories pertaining to Hg, grouper species in the family Serranidae are often lumped together and labeled generically as Grouper. However, grouper species vary considerably in growth rate, maximum age, and maximum size. This study examined the variability of Hg concentrations and bioaccumulation rates (increase of Hg concentrations in relation to age) for populations of three long-lived, slow-growing, protogynous hermaphrodite grouper species, gag Mycteroperca microlepis, scamp M. phenax, and red grouper Epinephelus morio, which are commercially and recreationally important in the offshore waters of the US southeastern region. A total of 268 samples from the three grouper species were processed for Hg analysis from 2013–2015. Concentrations of Hg ranged from 0.03 to 0.87 ppm wet weight, with a mean of 0.30 ppm. Gag accumulated Hg at a faster rate (as measured by the increase of Hg with fish age) than the other two species. Size, age, and δ15N were significant predictors for Hg in the two Mycteroperca species, while size and age were significant predictors for Hg in red grouper. Two of the three species had mean Hg concentrations within the one meal per week “Good Choices” consumption category (red grouper and scamp), and one species (gag) had a mean Hg level within the two meals per week “Good Choices” consumption category as advised by the US EPA and US FDA. These results support the separation of grouper species in advisories.
Mercury (Hg) concentrations and nitrogen (d 15 N) and carbon (d 13 C) stable isotopic ratios were... more Mercury (Hg) concentrations and nitrogen (d 15 N) and carbon (d 13 C) stable isotopic ratios were measured to assess differences in Hg bioaccumulation in four predatory fish species (Mycteroperca microlepis, Lutjanus campechanus, Caulolatilus microps, and Serioli dumerili) of high commercial and recreational importance in Atlantic waters of the southeastern US. Positive relationships existed between Hg and length, weight, and age, for all species, strongest for M. microlepis and L. campechanus. Intraspecific Hg concentrations also strongly correlated with d 15 N for all species, and d 13 C for only L. campechanus, and S. dumerili. Comparisons of stable isotopes between species and their impact on mean Hg concentration were inconclusive. This study is the first to report Hg concentrations for C. microps. The current study provides data for an under-sampled region, explores how feeding ecology impacts Hg uptake in commonly co-occurring fishes, and raises questions of the importance of sex and reproduction in Hg accumulation for marine fishes.
Fishes are an integral part of diets around the world, with approximately one billion people rely... more Fishes are an integral part of diets around the world, with approximately one billion people relying on fishes for their main source of protein. Eating fish provides an array of nutritional benefits; however the emerging concern of mercury exposure from the consumption of fish has led to much controversy concerning risks versus benefits. For this reason, studies measuring the mercury concentrations in commonly caught and consumed fish are an important part in relaying useful information to the public. But, care must be taken when issuing region- and nation-wide advisories for fish species or groups in which Hg data are only documented from one area for a wide-ranging species or from a small sample of individuals within a species. For example, in the mid-2000s, South Carolina fishers expressed confusion and concern about the FDA, EPA and SCDHEC “DO NOT EAT” advisory for “tilefish” (as an aggregate group) that was based on data from 1971 of 60 golden tilefish (Lopholatilus chamaeleont...
199 AbStract.-Sagittae (n=2,263) and gonads (n=870) from snowy grouper, Epinephelus niveatus, cau... more 199 AbStract.-Sagittae (n=2,263) and gonads (n=870) from snowy grouper, Epinephelus niveatus, caught primar-ily with longlines, Kali poles, snapper reels, and chevron traps off North Caro-lina and South Carolina were examined 1) to compare growth rates, population ...
Porous composite cathodes containing (La0.8Sr0.2)0.98MnO3 (LSM) and yttria stabilized zirconia (Y... more Porous composite cathodes containing (La0.8Sr0.2)0.98MnO3 (LSM) and yttria stabilized zirconia (YSZ) for use in solid oxide fuel cells (SOFCs) have been produced by air plasma spraying. Deposition was carried out using axial powder injection for increased deposition efficiency and composition control. A number of composite cathodes were produced using different combinations of parameter values within the identified range. Successful coatings were then characterized for composition and porosity using EDX and SEM. As a result of these tests, combinations of input parameter values were identified that are best suited to the production of coatings with microstructures appropriate for use in SOFC composite cathodes.
... Gary S. Groenewold,1∗ Marnie M. Cortez,1 Anita K. Gianotto,1 Garold L. Gresham,1 John E. Olso... more ... Gary S. Groenewold,1∗ Marnie M. Cortez,1 Anita K. Gianotto,1 Garold L. Gresham,1 John E. Olson,1 Robert V. Fox,1 Byron ... an indoor environment is important for assessing the potential for human exposure, time required to clear, and time available for effective sam-pling and ...
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