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The life history of longnose emperors (Lethrinus olivaceus) and a data‐limited assessment of their stock to support fisheries management at Rangiroa Atoll, French Polynesia.

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Title: The life history of longnose emperors (Lethrinus olivaceus) and a data‐limited assessment of their stock to support fisheries management at Rangiroa Atoll, French Polynesia.
Authors: Filous, Alexander1 (AUTHOR) afilous@hawaii.edu, Daxboeck, Charles1 (AUTHOR), Beguet, Teva2 (AUTHOR), Cook, Chuck1 (AUTHOR)
Source: Journal of Fish Biology. Mar2022, Vol. 100 Issue 3, p632-644. 13p.
Subjects: Lethrinus, Fishery management, Coral reefs & islands, Small-scale fisheries, Numbers of species, Fisheries
Geographic Terms: French Polynesia
Abstract: The spawning aggregations of coral reef species support artisanal fisheries throughout the Pacific Islands, but they are vulnerable to overexploitation and need improved fisheries management. To this aim, the authors employed a combination of fishery methods including life‐history studies to estimate the age, growth and reproductive parameters of longnose emperor (Lethrinus olivaceus), and a length‐based stock assessment to provide the community of Rangiroa Atoll with an assessment of their longnose emperor spawning aggregation fishery. The von Bertalanffy growth parameters of this species were estimated to be L∞ = 80 (75–87) cm TL, K = 0.18 (0.15–0.24), t0 = −0.82 (−1.43−0.27) with a mean natural mortality rate of 0.309 ± 0.038. The sex ratios observed in this study support the belief that this species exhibits functional protogyny with females reaching sexual maturity at 38 cm TL and approximately 3 years of age, and sex change occurring at approximately 45 cm TL and 4 years of age. The spawning potential ratio (SPR) of the longnose emperor stock was estimated to be between 19% and 28% across the years of this study, and simulations of SPR and yield per‐recruit indicate that if the community wanted to conserve >30% of the stock's SPR, the ideal minimum size limit for this species is 50 cm TL. The results provide the baseline life‐history information required to evaluate the fisheries for this species in the South Pacific region and support community‐led management actions for this spawning aggregation fishery on Rangiroa Atoll. [ABSTRACT FROM AUTHOR]
Copyright of Journal of Fish Biology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)
Database: Engineering Source
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Header DbId: egs
DbLabel: Engineering Source
An: 155950586
AccessLevel: 6
PubType: Academic Journal
PubTypeId: academicJournal
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  Data: The life history of longnose emperors (Lethrinus olivaceus) and a data‐limited assessment of their stock to support fisheries management at Rangiroa Atoll, French Polynesia.
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  Data: <searchLink fieldCode="AR" term="%22Filous%2C+Alexander%22">Filous, Alexander</searchLink><relatesTo>1</relatesTo> (AUTHOR)<i> afilous@hawaii.edu</i><br /><searchLink fieldCode="AR" term="%22Daxboeck%2C+Charles%22">Daxboeck, Charles</searchLink><relatesTo>1</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Beguet%2C+Teva%22">Beguet, Teva</searchLink><relatesTo>2</relatesTo> (AUTHOR)<br /><searchLink fieldCode="AR" term="%22Cook%2C+Chuck%22">Cook, Chuck</searchLink><relatesTo>1</relatesTo> (AUTHOR)
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  Data: <searchLink fieldCode="JN" term="%22Journal+of+Fish+Biology%22">Journal of Fish Biology</searchLink>. Mar2022, Vol. 100 Issue 3, p632-644. 13p.
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  Data: <searchLink fieldCode="DE" term="%22Lethrinus%22">Lethrinus</searchLink><br /><searchLink fieldCode="DE" term="%22Fishery+management%22">Fishery management</searchLink><br /><searchLink fieldCode="DE" term="%22Coral+reefs+%26+islands%22">Coral reefs & islands</searchLink><br /><searchLink fieldCode="DE" term="%22Small-scale+fisheries%22">Small-scale fisheries</searchLink><br /><searchLink fieldCode="DE" term="%22Numbers+of+species%22">Numbers of species</searchLink><br /><searchLink fieldCode="DE" term="%22Fisheries%22">Fisheries</searchLink>
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  Data: <searchLink fieldCode="DE" term="%22French+Polynesia%22">French Polynesia</searchLink>
– Name: Abstract
  Label: Abstract
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  Data: The spawning aggregations of coral reef species support artisanal fisheries throughout the Pacific Islands, but they are vulnerable to overexploitation and need improved fisheries management. To this aim, the authors employed a combination of fishery methods including life‐history studies to estimate the age, growth and reproductive parameters of longnose emperor (Lethrinus olivaceus), and a length‐based stock assessment to provide the community of Rangiroa Atoll with an assessment of their longnose emperor spawning aggregation fishery. The von Bertalanffy growth parameters of this species were estimated to be L∞ = 80 (75–87) cm TL, K = 0.18 (0.15–0.24), t0 = −0.82 (−1.43−0.27) with a mean natural mortality rate of 0.309 ± 0.038. The sex ratios observed in this study support the belief that this species exhibits functional protogyny with females reaching sexual maturity at 38 cm TL and approximately 3 years of age, and sex change occurring at approximately 45 cm TL and 4 years of age. The spawning potential ratio (SPR) of the longnose emperor stock was estimated to be between 19% and 28% across the years of this study, and simulations of SPR and yield per‐recruit indicate that if the community wanted to conserve >30% of the stock's SPR, the ideal minimum size limit for this species is 50 cm TL. The results provide the baseline life‐history information required to evaluate the fisheries for this species in the South Pacific region and support community‐led management actions for this spawning aggregation fishery on Rangiroa Atoll. [ABSTRACT FROM AUTHOR]
– Name: AbstractSuppliedCopyright
  Label:
  Group: Ab
  Data: <i>Copyright of Journal of Fish Biology is the property of Wiley-Blackwell and its content may not be copied or emailed to multiple sites without the copyright holder's express written permission. Additionally, content may not be used with any artificial intelligence tools or machine learning technologies. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract.</i> (Copyright applies to all Abstracts.)
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RecordInfo BibRecord:
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      – Type: doi
        Value: 10.1111/jfb.14977
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      – Code: eng
        Text: English
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      Pagination:
        PageCount: 13
        StartPage: 632
    Subjects:
      – SubjectFull: Lethrinus
        Type: general
      – SubjectFull: Fishery management
        Type: general
      – SubjectFull: Coral reefs & islands
        Type: general
      – SubjectFull: Small-scale fisheries
        Type: general
      – SubjectFull: Numbers of species
        Type: general
      – SubjectFull: Fisheries
        Type: general
      – SubjectFull: French Polynesia
        Type: general
    Titles:
      – TitleFull: The life history of longnose emperors (Lethrinus olivaceus) and a data‐limited assessment of their stock to support fisheries management at Rangiroa Atoll, French Polynesia.
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            NameFull: Filous, Alexander
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            NameFull: Daxboeck, Charles
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            NameFull: Beguet, Teva
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            NameFull: Cook, Chuck
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            – D: 01
              M: 03
              Text: Mar2022
              Type: published
              Y: 2022
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              Value: 100
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            – TitleFull: Journal of Fish Biology
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