Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China Sea
Based on length frequency data of miter squid (Uroteuthis chinensis) collected in the northeastern South China Sea in 1975–1977, 1997–1999, and 2018–2019, asymptotic length, optimal length at first capture, relative mortality, and relative biomass of the stock were estimated using length-based Bayes...
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| Format: | Article |
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Frontiers Media S.A.
2021-01-01
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| Series: | Frontiers in Marine Science |
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| Online Access: | https://www.frontiersin.org/articles/10.3389/fmars.2020.518627/full |
| _version_ | 1818673491716603904 |
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| author | Xuehui Wang Yinglin He Feiyan Du Feiyan Du Mengna Liu Mengna Liu Weilie Bei Yancong Cai Yancong Cai Yongsong Qiu Yongsong Qiu |
| author_facet | Xuehui Wang Yinglin He Feiyan Du Feiyan Du Mengna Liu Mengna Liu Weilie Bei Yancong Cai Yancong Cai Yongsong Qiu Yongsong Qiu |
| author_sort | Xuehui Wang |
| collection | DOAJ |
| description | Based on length frequency data of miter squid (Uroteuthis chinensis) collected in the northeastern South China Sea in 1975–1977, 1997–1999, and 2018–2019, asymptotic length, optimal length at first capture, relative mortality, and relative biomass of the stock were estimated using length-based Bayesian biomass estimation (LBB). The LBB-estimated asymptotic length for 2018–2019 was smaller. Optimal lengths at first capture for the later far exceeded average lengths in catches because of a major increase in fishing intensity. Between 1975 and 1977, relative total mortality (Z/K) was low, but it increased in the latter two periods, while relative natural mortality (M/K) showed a downward trend. Relative biomasses (B/B0 and B/Bmsy) indicated that the stock was close to unexploited between 1975 and 1977, but they declined to the levels of 6% and 4% in the later periods, which correspond to growth in fishing horsepower. Indeed, by 2018, fishing horsepower increased by nearly four times the optimal level. The analysis suggests that the stock of miter squid has been overfished since the mid-1980s and is now under heavy fishing pressure. To recover the stock, it is imperative to reduce fishing intensity and enforce size-at-first-capture regulations. |
| first_indexed | 2024-12-17T07:56:38Z |
| format | Article |
| id | doaj.art-7082244e1ca8417fb40cf90c91182f16 |
| institution | Directory Open Access Journal |
| issn | 2296-7745 |
| language | English |
| last_indexed | 2024-12-17T07:56:38Z |
| publishDate | 2021-01-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Marine Science |
| spelling | doaj.art-7082244e1ca8417fb40cf90c91182f162022-12-21T21:57:39ZengFrontiers Media S.A.Frontiers in Marine Science2296-77452021-01-01710.3389/fmars.2020.518627518627Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China SeaXuehui Wang0Yinglin He1Feiyan Du2Feiyan Du3Mengna Liu4Mengna Liu5Weilie Bei6Yancong Cai7Yancong Cai8Yongsong Qiu9Yongsong Qiu10South China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, ChinaChina Blue Sustainability Institute, Haikou, ChinaSouth China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, ChinaGuangdong Provincial Key Laboratory of Fishery Ecology and Environment, Guangzhou, ChinaSouth China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, ChinaCollege of Marine Sciences, Shanghai Ocean University, Shanghai, ChinaChina Blue Sustainability Institute, Haikou, ChinaSouth China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, ChinaKey Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, ChinaSouth China Sea Fisheries Research Institute, Chinese Academy of Fishery Sciences, Guangzhou, ChinaKey Laboratory of Open-Sea Fishery Development, Ministry of Agriculture and Rural Affairs, Guangzhou, ChinaBased on length frequency data of miter squid (Uroteuthis chinensis) collected in the northeastern South China Sea in 1975–1977, 1997–1999, and 2018–2019, asymptotic length, optimal length at first capture, relative mortality, and relative biomass of the stock were estimated using length-based Bayesian biomass estimation (LBB). The LBB-estimated asymptotic length for 2018–2019 was smaller. Optimal lengths at first capture for the later far exceeded average lengths in catches because of a major increase in fishing intensity. Between 1975 and 1977, relative total mortality (Z/K) was low, but it increased in the latter two periods, while relative natural mortality (M/K) showed a downward trend. Relative biomasses (B/B0 and B/Bmsy) indicated that the stock was close to unexploited between 1975 and 1977, but they declined to the levels of 6% and 4% in the later periods, which correspond to growth in fishing horsepower. Indeed, by 2018, fishing horsepower increased by nearly four times the optimal level. The analysis suggests that the stock of miter squid has been overfished since the mid-1980s and is now under heavy fishing pressure. To recover the stock, it is imperative to reduce fishing intensity and enforce size-at-first-capture regulations.https://www.frontiersin.org/articles/10.3389/fmars.2020.518627/fulllength frequencyLBBdata-limitationstock statusUroteuthis chinensisnortheastern South China Sea |
| spellingShingle | Xuehui Wang Yinglin He Feiyan Du Feiyan Du Mengna Liu Mengna Liu Weilie Bei Yancong Cai Yancong Cai Yongsong Qiu Yongsong Qiu Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China Sea Frontiers in Marine Science length frequency LBB data-limitation stock status Uroteuthis chinensis northeastern South China Sea |
| title | Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China Sea |
| title_full | Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China Sea |
| title_fullStr | Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China Sea |
| title_full_unstemmed | Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China Sea |
| title_short | Using LBB Tools to Assess Miter Squid Stock in the Northeastern South China Sea |
| title_sort | using lbb tools to assess miter squid stock in the northeastern south china sea |
| topic | length frequency LBB data-limitation stock status Uroteuthis chinensis northeastern South China Sea |
| url | https://www.frontiersin.org/articles/10.3389/fmars.2020.518627/full |
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