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  • 1
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    Electrical phase angle as a new method to measure fish condition (2021)
    In:  http://aquaticcommons.org/id/eprint/8778 | 403 | 2012-06-10 09:00:18 | 8778 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-27
    Description: In this study, phase angle (the ratio of resistance and reactance of tissue to applied electrical current) is presented as a possible new method to measure fish condition. Condition indices for fish have historically beenbased on simple weight-at-length relationships, or on costly and timeconsuming laboratory procedures that measure specific physiological parameters. Phase angle is introducedto combine the simplicity of a quick field-based measurement with the specificity of laboratory analysis bydirectly measuring extra- and intracellular water distribution within an organism, which is indicative of itscondition. Phase angle, which can be measured in the field or laboratory in the time it takes to measure length and weight, was measured in six species of fish at different states (e.g., fed vs. fasted, and postmortem) and under different environmental treatments (wild vs. hatchery, winter vs. spring). Phase angle reflected different states of condition. Phase angles 〈15° indicated fish in poor condition, and phase angles 〉15° indicated fish that were in better condition. Phase angle was slightly affectedby temperatures (slope = – 0.19) in the 0–8°C range and did not change in fish placed on ice for 〈12 hours. Phase angle also decreased over time in postmortem fish because of cellmembrane degradation and subsequent water movement from intra- to extracellular (interstitial) spaces. Phase angle also reflected condition of specific anatomical locations within the fish.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 477-487
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  • 2
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    Cruise Report 62S5,62S6, 62M1, 62M2 - Abalone (2021)
    California Department of Fish and Game, Marine Resources Operations | Terminal Island, CA
    In:  http://aquaticcommons.org/id/eprint/2512 | 8 | 2011-09-29 18:59:51 | 2512 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-25
    Description: (PDF contains 6 pages.)
    Keywords: Fisheries ; Biology ; Avila ; San Simeon ; Channel Islands ; cruise report ; N. B. Scofield ; M. V. Mollusk ; abalone ; growth ; transplanting ; maturity
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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  • 3
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    Cruise Report 63-S-5, 63-M-1 - Abalone (2021)
    California Department of Fish and Game, Marine Resources Operations | Terminal Island, CA
    In:  http://aquaticcommons.org/id/eprint/2526 | 8 | 2011-09-29 18:49:54 | 2526 | California Department of Fish and Game
    Details
    Publication Date: 2021-06-25
    Description: (PDF contains 5 pages.)
    Keywords: Fisheries ; Biology ; San Simeon ; Morro Bay ; Channel Islands ; abalone ; sea otters ; tag
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
    Format: application/pdf
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