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  • Articles  (7)
  • Fisheries  (5)
  • oyster spat  (2)
  • 2020-2022  (7)
  • 1970-1974
  • 1920-1924
  • 1
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    Age validation of Dover sole (Microstomus pacificus) by means of bomb radiocarbon (2021)
    In:  http://aquaticcommons.org/id/eprint/8819 | 403 | 2012-06-12 17:55:37 | 8819 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: We used bomb radiocarbon (14C) in this age validation study of Dover sole (Microstomus pacificus). The otoliths of Dover sole, a commercially important fish in the NorthPacific, are difficult to age and ages derived from the current break-andburn method were not previously validated. The otoliths used in this study were chosen on the basis of estimated birth year and for the ease of interpreting growth zone patterns. Otolith cores, material representingyears 0 through 3, were isolated and analyzed for 14C. Additionally, a small number of otoliths with difficult-to-interpret growth patterns were analyzed for 14C to help determine age interpretation. The measured Dover sole 14C values in easier-to-interpret otoliths were compared with a14C reference chronology for Pacific halibut (Hippoglossus stenolepis) in the North Pacific. We used an objectivestatistical analysis where sums of squared residuals between otolith 14C values of Dover sole and the referencechronology were examined. Our statistical analysis also included a procedure where the Dover sole 14C values were standardized to the reference chronology. These proceduresallowed an evaluation of aging error. The 14C results indicated that the Dover sole age estimates from theeasier-to-interpret otoliths with the break-and-burn method are accurate. This study validated Dover sole agesfrom 8 to 47 years.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 375-385
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  • 2
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    Using the empirical Bayes method to estimate and evaluate bycatch rates of seabirds from individual fishing vessels (2021)
    In:  http://aquaticcommons.org/id/eprint/8872 | 403 | 2012-06-18 09:36:36 | 8872 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-28
    Description: Minimizing bycatch of seabirds is a major goal of the U.S. National Marine Fisheries Service. In Alaska waters, the bycatch (i.e., inadvertent catches) of seabirds has been an incidental result of demersal groundfish longline fishery operations. Notably, the endangered short-tailed albatross(Phoebastria albatrus) has been taken in this groundfish fishery. Bycatch rates of seabirds from individual vessels may be of particular interest because vessels with high bycatch rates may not be functioning effectively with seabird avoidance gears, and there may be a need for suggestions on how to use these avoidance gears more effectively. Therefore, bycatch estimates are usually madeon an individual vessel basis and then summed to obtain the total estimate for the entire fleet.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 577-581
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  • 3
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    Parameterizing probabilities for estimating age-composition distributions for mixture models (2021)
    In:  http://aquaticcommons.org/id/eprint/8999 | 403 | 2020-08-24 00:01:26 | 8999 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-06-30
    Description: When estimating parameters that constitute a discrete probability distribution {pj}, it is difficult to determine how constraints should be made to guarantee that the estimated parameters { pˆj} constitute a probability distribution (i.e., pˆj〉0, Σ pˆj =1). For age distributions estimated from mixtures of length-at-age distributions, the EM (expectationmaximization) algorithm (Hasselblad, 1966; Hoenig and Heisey, 1987; Kimura and Chikuni, 1987), restricted least squares (Clark, 1981), and weak quasisolutions (Troynikov, 2004) have all been used. Each of these methods appears to guarantee that the estimated distribution will be a true probability distribution with all categories greater than or equal to zero and with individual probabilities that sum to one. In addition, all these methods appear to provide a theoretical basis for solutions that will be either maximum-likelihood estimates or at least convergent to a probability distribut
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 303-305
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  • 4
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    Estimating age of spotted and spinner dolphins (Stenella attenuata and Stenella longirostris) from teeth (2021)
    NOAA/National Marine Fisheries Service/Southwest Fisheries Science Center | La Jolla, CA
    In:  http://aquaticcommons.org/id/eprint/2459 | 403 | 2011-09-29 19:05:15 | 2459 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-13
    Description: This paper is an account of preparation and examination techniques and criteria used to estimate age in decalcified and stained tooth thin sections from spinner and spotted dolphins. A dentinal growth layer group (GLG),composed of two thin light and two thicker dark-stained layers, is deposited annually. The GLG component layers are variably visible, but the "ideal" pattern and successive thinning of dentinal GLGs are used as a guide to determine GLG limits. Age-specific thicknesses of dentinal GLGs found in Hawaiian spinner dolphin teeth seem to be applicable to teeth of spotted dolphins and can be used as an aid in locating GLG boundaries. Cementa1 GLGs are composed of a dark-stained and alightly stained layer and usually aredeposited at a rate of one per year, but may be deposited every other year or two or three times per year. Two slightly different methods of counting dentinal GLGs are presented, along with guidelines for determining whetherdentinal or cementa1 GLG counts provide the best estimate of age for a specimen. (PDF contains 23 pages.)
    Keywords: Ecology ; Conservation ; Fisheries ; Spinner dolphins ; Spotted dolphins ; aging ; teeth ; Stenella attenuata ; Stenella longirostris
    Repository Name: AquaDocs
    Type: monograph
    Format: application/pdf
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  • 5
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    Oyster growth and its environment at the oyster farm in Hiroshima Bay (2021)
    In:  http://aquaticcommons.org/id/eprint/2862 | 9 | 2010-12-14 17:50:19 | 2862
    Details
    Publication Date: 2021-06-29
    Description: U.S. Joint Publications Research Service Translation "Miscellaneous translations on oyster biology" dated 1965, pp.84-108
    Keywords: Aquaculture ; oyster aquaculture ; oyster disease ; oyster spat
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 57-76
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  • 6
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    The distribution of oyster larvae and spatfalls in the Hiroshima City perimeter (2021)
    In:  http://aquaticcommons.org/id/eprint/2860 | 9 | 2010-12-14 17:50:14 | 2860
    Details
    Publication Date: 2021-06-29
    Description: U.S. Joint Publications Research Service Translation "Miscellaneous translations on oyster biology" dated 1965, pp.11-28
    Keywords: Aquaculture ; oyster aquaculture ; oyster disease ; oyster spat
    Repository Name: AquaDocs
    Type: article
    Format: application/pdf
    Format: application/pdf
    Format: 8-18
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  • 7
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    Indirect validation of the age-reading method for Pacific cod (Gadus macrocephalus) using otoliths from marked and recaptured fish (2021)
    In:  http://aquaticcommons.org/id/eprint/9648 | 403 | 2012-08-14 12:15:51 | 9648 | United States National Marine Fisheries Service
    Details
    Publication Date: 2021-07-08
    Description: Two examples of indirect validation are described for age-reading methods of Pacific cod (Gadus macrocephalus). Aging criteria that exclude faint translucent zones (checks) in counts of annuli and criteria that include faint zones wereboth tested. Otoliths from marked and recaptured fish were used to back-calculate the length of each fish at the time of its release by using measurements of the area ofannuli. Estimated fish size at time of release and actual observed fish size were similar, supporting the assumption that translucent zones are laid down on an annual basis. Asecond method for validating reading criteria used otolith age and von Bertalanffy parameters, estimated from the tagging data, to predict how much each fish grew in lengthafter tagging. We found that otolith aging criteria applied to otoliths from tagged and recovered Pacific cod predictedquite accurately the growth increments that we observed in these specimens. These results provide further evidence that the current aging criteria are not underestimating theage of the fish and support our current interpretation of checks (i.e., as subannual marks). We expect these indirect validations to advance age determination for Pacific cod, which in turn would enhance development of stock assessment methods based on age structure for this species in the eastern Bering Sea.
    Keywords: Biology ; Ecology ; Fisheries
    Repository Name: AquaDocs
    Type: article , TRUE
    Format: application/pdf
    Format: application/pdf
    Format: 153-160
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