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  • 1
    Online Resource
    Online Resource
    JSTOR ; 1981
    In:  Man Vol. 16, No. 2 ( 1981-06), p. 307-
    In: Man, JSTOR, Vol. 16, No. 2 ( 1981-06), p. 307-
    Type of Medium: Online Resource
    ISSN: 0025-1496
    Language: Unknown
    Publisher: JSTOR
    Publication Date: 1981
    detail.hit.zdb_id: 3444-7
    detail.hit.zdb_id: 2981876-X
    detail.hit.zdb_id: 2002830-1
    detail.hit.zdb_id: 218240-3
    SSG: 12
    SSG: 10
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  • 2
    Online Resource
    Online Resource
    Cambridge University Press (CUP) ; 1986
    In:  Polar Record Vol. 23, No. 142 ( 1986-01), p. 37-47
    In: Polar Record, Cambridge University Press (CUP), Vol. 23, No. 142 ( 1986-01), p. 37-47
    Abstract: This article describes a framework within which an initial strategy could be developed for managing commercial exploitation of marine living resources of the Southern Ocean, particularly of krill and fish, in accordance with Article II of the Convention for the Conservation of Antarctic Marine Living Resources (CCAMLR). Quantitative predictions involving multi–species models are needed to assess any indirect impacts of fish or krill exploitation, and also for management to restore depleted populations. This article recommends research to provide the knowledge necessary for the models (identifying key species, estimating their demographic status, and experimental interference), and suggests interim management action to delimit management areas, agree target levels for stock–size, and monitor stocks. Early efforts to model the fishing operation are particularly recommended.
    Type of Medium: Online Resource
    ISSN: 0032-2474 , 1475-3057
    Language: English
    Publisher: Cambridge University Press (CUP)
    Publication Date: 1986
    detail.hit.zdb_id: 3926-3
    detail.hit.zdb_id: 2100301-4
    SSG: 14
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  • 3
    In: Fisheries Research, Elsevier BV, Vol. 65, No. 1-3 ( 2003-12), p. 453-465
    Type of Medium: Online Resource
    ISSN: 0165-7836
    Language: English
    Publisher: Elsevier BV
    Publication Date: 2003
    detail.hit.zdb_id: 406532-3
    detail.hit.zdb_id: 1497860-X
    SSG: 21,3
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  • 4
    Online Resource
    Online Resource
    Elsevier BV ; 1989
    In:  Critical Care Clinics Vol. 5, No. 4 ( 1989-10), p. 807-820
    In: Critical Care Clinics, Elsevier BV, Vol. 5, No. 4 ( 1989-10), p. 807-820
    Type of Medium: Online Resource
    ISSN: 0749-0704
    Language: English
    Publisher: Elsevier BV
    Publication Date: 1989
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  • 5
    Online Resource
    Online Resource
    Frontiers Media SA ; 2023
    In:  Frontiers in Marine Science Vol. 10 ( 2023-8-9)
    In: Frontiers in Marine Science, Frontiers Media SA, Vol. 10 ( 2023-8-9)
    Abstract: An individual tagging model was implemented within the spatial, seasonal, multi-stock, multi-fleet operating models of the peer-reviewed Management Strategy Evaluation (MSE) framework for Atlantic bluefin tuna to evaluate the benefits of a harvest strategy that utilizes conventional gene tagging. A multi-year Brownie estimator was developed to test the accuracy and precision of exploitation rate estimates arising from gene tagging programs with various scenarios for spatial release distribution, release numbers and fishery exploitation rates. Harvest strategies that used the Brownie estimator were tested to evaluate yield and resource conservation performance relative to idealized management using perfect information. For the eastern stock, releasing 1,000 fish throughout the Atlantic and genotyping 27% of all landed fish at an estimated cost of US$2M was sufficient to obtain estimates of exploitation rate with a coefficient of variation of 20%. For the western stock, the same precision in exploitation rate estimates required the release of 1,300 fish and genotyping rate of 35% at an estimated cost of US$2.5M. Harvest strategies using the gene tagging data provided expected yield and resource conservation performance that was not substantially lower than a harvest strategy assuming using perfect information regarding vulnerable biomass. Reducing the number of releases most strongly affected the worst-case ‘lower-tail’ outcomes for West area yield and eastern stock biomass. Conventional gene tagging harvest strategies offer a promising basis for calculating management advice for Atlantic bluefin tuna that may be cheaper, simpler, and more robust than the current conventional stock assessment paradigm.
    Type of Medium: Online Resource
    ISSN: 2296-7745
    Language: Unknown
    Publisher: Frontiers Media SA
    Publication Date: 2023
    detail.hit.zdb_id: 2757748-X
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  • 6
    Online Resource
    Online Resource
    Canadian Science Publishing ; 2017
    In:  Canadian Journal of Fisheries and Aquatic Sciences Vol. 74, No. 11 ( 2017-11), p. 1895-1903
    In: Canadian Journal of Fisheries and Aquatic Sciences, Canadian Science Publishing, Vol. 74, No. 11 ( 2017-11), p. 1895-1903
    Abstract: Differences in parasite infection have previously been used to distinguish between fish stocks. We demonstrate a novel use of parasite prevalence-by-length data to inform quantitatively on stock mixing. An initial two mixing stock hypothesis proved consistent with biological and survey data, suggesting that there are different stocks of sardine off the west and south coasts of South Africa. That hypothesis assumed that only recruits moved from the west to the south stock. However, new “tetracotyle”-type metacercarian parasite bio-tag data indicate a need to allow older fish to move between the stocks as well. We demonstrate extension of bio-tagging to inform on the plausibility of population structure hypotheses by including parasite prevalence-by-length data in the model’s likelihood. Our method enables the estimation of the magnitude of mixing between semidiscrete stocks, providing more precise estimates of annual movement. Such improved precision may be important in better informing future movement hypotheses and thereby management. Our research provides a framework to use to inform quantitatively on stock structure and movement hypotheses for other fish species with bio-tagging data.
    Type of Medium: Online Resource
    ISSN: 0706-652X , 1205-7533
    Language: English
    Publisher: Canadian Science Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 7966-2
    detail.hit.zdb_id: 1473089-3
    SSG: 21,3
    SSG: 12
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  • 7
    Online Resource
    Online Resource
    JSTOR ; 1982
    In:  The Hispanic American Historical Review Vol. 62, No. 4 ( 1982-11), p. 715-
    In: The Hispanic American Historical Review, JSTOR, Vol. 62, No. 4 ( 1982-11), p. 715-
    Type of Medium: Online Resource
    ISSN: 0018-2168
    RVK:
    Language: Unknown
    Publisher: JSTOR
    Publication Date: 1982
    detail.hit.zdb_id: 2013337-6
    SSG: 7,34
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  • 8
    In: ICES Journal of Marine Science, Oxford University Press (OUP), Vol. 67, No. 3 ( 2010-04-01), p. 567-574
    Abstract: Butterworth, D. S., Bentley, N., De Oliveira, J. A. A., Donovan, G. P., Kell, L. T., Parma, A. M., Punt, A. E., Sainsbury, K. J., Smith, A. D. M., and Stokes, T. K. 2010. Purported flaws in management strategy evaluation: basic problems or misinterpretations? – ICES Journal of Marine Science, 67: 567–574. Rochet and Rice, while recognizing management strategy evaluation (MSE) as an important step forward in fisheries management, level a number of criticisms at its implementation. Some of their points are sound, such as the need for care in representing uncertainties and for thorough documentation of the process. However, others evidence important misunderstandings. Although the difficulties in estimating tail probabilities and risks, as discussed by Rochet and Rice, are well known, their arguments that Efron's non-parametric bootstrap re-sampling method underestimates the probabilities of low values are flawed. In any case, though, the focus of MSEs is primarily on comparing performance and robustness across alternative management procedures (MPs), rather than on estimating absolute levels of risk. Qualitative methods can augment MSE, but their limitations also need to be recognized. Intelligence certainly needs to play a role in fisheries management, but not at the level of tinkering in the provision of annual advice, which Rochet and Rice apparently advocate, inter alia because this runs the risk of advice following noise rather than signal. Instead, intelligence should come into play in the exercise of oversight through the process of multiannual reviews of MSE and associated MPs. A number of examples are given of the process of interaction with stakeholders which should characterize MSE.
    Type of Medium: Online Resource
    ISSN: 1095-9289 , 1054-3139
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2010
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    detail.hit.zdb_id: 1468003-8
    detail.hit.zdb_id: 29056-7
    SSG: 12
    SSG: 21,3
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  • 9
    Online Resource
    Online Resource
    International Whaling Commission ; 2023
    In:  J. Cetacean Res. Manage. Vol. 5, No. 1 ( 2023-04-12), p. 1-11
    In: J. Cetacean Res. Manage., International Whaling Commission, Vol. 5, No. 1 ( 2023-04-12), p. 1-11
    Abstract: The relationship between observer experience and the number of minke whale schools sighted on International Whaling Commission/International Decade of Cetacean Research-Southern Ocean Whale and Ecosystem Research (IWC/IDCR-SOWER) surveys from 1993/94 to 1998/99 is investigated for Independent Observer (IO) mode survey. Observer experience is defined as the number of past sightings surveys in which the observer participated. During the third circumpolar set of surveys (from 1991/92 onwards), about half of the observers had participated in fewer than five previous sightings surveys. Based upon the QAIC model selection criterion, the observers are classified into two groups depending on their experience: ‘Beginners’ (0-4 surveys) and ‘Experts’ ( 〉 4). The sighting rate for minke whale schools by Beginners is estimated to be 42% lower than that by Expert observers. Furthermore, perpendicular distances to the sightings do not show significant differences in relation to observer experience. These results jointly indicate that the probability of detection on the trackline, g(0), may be less than one when Beginners are amongst those observing. Abundance estimation for minke whales in IO mode involves the sightings made by triple observer combinations, with two observers in the barrel and one observer in the Independent Observer Platform (IOP) all searching simultaneously. Surprisingly, given the result above, no significant trend in sighting rate with the combined experience of this three-observer combination is detected. This might be an artifact of small sample size for some observer combinations, such as Experts in all platforms. When observer combinations in the barrel are pooled across, the estimated trend in the sighting rate with combined observer experience becomes steeper. Furthermore, when like-minke sightings are also taken into account, the trend becomes steeper still. In this case, when observations are pooled across observer combinations in the barrel, a model for sighting rate that includes an observer effect is selected in terms of the QAIC criteria. These analyses thus provide suggestive evidence that the introduction of Beginner observers during the third circumpolar set of surveys may have reduced g(0) and hence negatively biased abundance estimates for minke whales, both in absolute terms and compared with estimates from the second circumpolar set of surveys.
    Type of Medium: Online Resource
    ISSN: 2312-2706 , 1561-0713
    URL: Issue
    Language: Unknown
    Publisher: International Whaling Commission
    Publication Date: 2023
    detail.hit.zdb_id: 2744616-5
    SSG: 21,3
    SSG: 12
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  • 10
    Online Resource
    Online Resource
    International Whaling Commission ; 2023
    In:  J. Cetacean Res. Manage. Vol. 5, No. 3 ( 2023-04-11), p. 253-260
    In: J. Cetacean Res. Manage., International Whaling Commission, Vol. 5, No. 3 ( 2023-04-11), p. 253-260
    Abstract: As part of the International Whaling Commission’s SOWER blue whale research programme, two sighting vessels, the Shonan Maru and the Shonan Maru No.2, surveyed the Madagascar Plateau between 25° and 35°S, 40° and 45°E, in December 1996. A total of 95 sightings of 110 blue whales (assigned in the field as pygmy blue whales – see discussion), 14 sightings of 21 blue whales (subspecies undetermined) and 12 sightings of 13 ‘like blue’ whales was made in 23 days. In the first half of the survey, the whole research area was covered in a mainly pre-determined zigzag search pattern, and the associated sightings and effort have been used to derive density estimates for blue whales for the area. Sightings in the second half of the survey, where effort was directed at blue whale concentrations, have only been used to provide supplementary data for calculation of the effective search half-width and mean school size. The resulting population estimate is 424 (CV = 0.42), or 472 (CV = 0.48) whales when ‘like blue’ sightings are included. Dive times and surfacing behaviour recorded in just over 21h of monitoring suggest that the assumption that all groups on the trackline were seen (g(0) = 1) is reasonable. As the geographical extent of the survey area was substantially less than that of past catches of blue whales in the region in December, this estimate must refer to only a portion (possibly about one third) of the total population. Some evidence of feeding on euphausiids in the region was detected, possibly as a consequence of a localised upwelling cell at the southern tip of Madagascar.
    Type of Medium: Online Resource
    ISSN: 2312-2706 , 1561-0713
    URL: Issue
    Language: Unknown
    Publisher: International Whaling Commission
    Publication Date: 2023
    detail.hit.zdb_id: 2744616-5
    SSG: 21,3
    SSG: 12
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