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  • 1
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    Proximate and fatty acid composition of 40 southeastern U.S. finfish species (2021)
    NOAA/National Marine Fisheries Service
    In:  http://aquaticcommons.org/id/eprint/2768 | 403 | 2011-09-29 18:26:43 | 2768 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: This report describes the proximate compositions (protein, moisture, fat, and ash) and major fatty acid profiles for raw and cooked samples of 40 southeastern finfish species. All samples (fillets) were cooked by a standard procedure in laminated plastic bags to an internal temperature of 70'C (lS8'F). Both summarized compositional data, with means and ranges for each species, and individual sample data including harvest dates and average lengths and weights are presented. When compared with raw samples, cooked samples exhibited an increase in protein contentwith an accompanying decrease in moisture content. Fat content either remained approximately the same or increased due to moisture loss during cooking. Our results are discussed in reference to compositional data previouslypublished by others on some of the same species. Although additional data are needed to adequately describe the seasonal and geographic variations in the chemical compositions of many of these fish species, the results presented here should be useful to nutritionists, seafood marketers, and consumers.(PDF file contains 28 pages.)
    Keywords: Fisheries ; Biology ; Chemistry
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 2
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    Preparation of acetate peels of valves from the ocean quahog, Arctica islandica, for age determinations (2021)
    NOAA/National Marine Fisheries Service
    In:  http://aquaticcommons.org/id/eprint/2772 | 403 | 2011-09-29 18:27:13 | 2772 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: Techniques are described for preparing acetate peels of sectioned valves of ocean quahogs, Arctica islandica, for age determinations. The respective sequence of preparation begins by sectioning left valves oriented to include a single hinge tooth, bleaching to remove the heavy periostracum, embedding the valves in an epoxy resin, grinding and polishing the embedments to a high luster, etching the exposed cut valve surfaces, and applying sheet acetate with acetone. Annuli are clearly defined relative to growth increments in the peel preparations for all sizes and ages of ocean quahogs. (PDF file contains12 pages.)
    Keywords: Ecology ; Fisheries ; Biology ; Chemistry
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 3
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    Studies of chemical speciation in naturally anoxic basins (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5181 | 3949 | 2011-09-29 15:17:17 | 5181 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-09
    Description: The chemical speciation of both metals and non-metals, the use of polarographic techniques, and application to the study of the chemistry of anoxic waters are considered. In the first part of the paper unfamiliar terminology is explained and then an example of simple lake chemistry is presented to illustrate why the concept of speciation is necessary.
    Keywords: Chemistry ; Limnology ; Chemical speciation ; Anoxic basins ; Annual report
    Repository Name: AquaDocs
    Type: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 53-59
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  • 4
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    Treading in Mortimer's footsteps: the geochemical cycling of iron and manganese in Esthwaite water (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5193 | 3949 | 2011-09-29 15:15:03 | 5193 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-09
    Description: A study of the geochemical cycling of iron and manganese in a seasonally stratified lake, Esthwaite water is described. This work is based on speculative ideas on environmental redox chemistry of iron which were proposed by C.H. Mortimer in the 1940's. These observations have been verified and some speculations confirmed, along with a new understanding of the manganese cycle, and detailed information on the particulate forms of both iron and manganese. Details on the mechanisms and transformations of iron have also emerged.
    Keywords: Biology ; Chemistry ; Chemical precipitation ; Freshwater lakes ; Iron ; Manganese ; Oxidation ; Redox potential ; Reduction ; Stratification ; England ; Esthwaite Lake ; Annual report
    Repository Name: AquaDocs
    Type: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 91-101
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  • 5
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    Long-term natural acidification of upland sites in Cumbria: Evidence from post-glacial lake sediments (2021)
    Freshwater Biological Association | Ambleside, UK
    In:  http://aquaticcommons.org/id/eprint/5197 | 3949 | 2011-09-29 15:15:33 | 5197 | Freshwater Biological Association
    Details
    Publication Date: 2021-07-09
    Description: Studies by the Freshwater Biological Association over the last 25 years have supplied data relevant to the levels of acidity in local soils and water before the onset of industrial pollution and current interest in acid rain. This article reviews published analysis from cores of lake sediments, in or near the catchment of the River Duddon. Electron spin resonance spectra of humic acids and iodine values confirm evidence from pollen analysis for a history of progressive acidification of the source material of lake sediments since before 5000 radiocarbon years, in upland catchments of the Lake District. Processes involved included: removal of basic ions from soils by rainfall, the effects of which were intensified by removal by man of deciduous forest; acidification of soils and waters by decomposition products of Calluna and further acidification of waters by Sphagnum species which colonized habitats where drainage became impeded by paludification processes.
    Keywords: Biology ; Chemistry ; Earth Sciences ; Acid rain ; Acidification ; Freshwater lakes ; Lake Basins ; Lake deposits ; pH ; Palnology ; England ; Cumbria ; Annual report
    Repository Name: AquaDocs
    Type: book_section , FALSE
    Format: application/pdf
    Format: application/pdf
    Format: 28-46
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