Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based Approach
An assessment of the stock status and historical changes in abundance of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, was carried out based on field surveys conducted in 2019–2020 and published length-frequency (L/F) data from earlier periods....
| Main Authors: | , , , , , , |
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| Format: | Article |
| Language: | English |
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MDPI AG
2022-04-01
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| Series: | Fishes |
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| Online Access: | https://www.mdpi.com/2410-3888/7/3/95 |
| _version_ | 1827660356419321856 |
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| author | Lu Zhai Zengguang Li Yongbin Hu Chengwei Huang Siquan Tian Rong Wan Daniel Pauly |
| author_facet | Lu Zhai Zengguang Li Yongbin Hu Chengwei Huang Siquan Tian Rong Wan Daniel Pauly |
| author_sort | Lu Zhai |
| collection | DOAJ |
| description | An assessment of the stock status and historical changes in abundance of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, was carried out based on field surveys conducted in 2019–2020 and published length-frequency (L/F) data from earlier periods. These two species’ current and past relative biomasses (<i>B</i>/<i>B<sub>MSY</sub>)</i> were estimated using a length-based Bayesian biomass estimation method (LBB). The LLB method also estimated their asymptotic lengths (<i>L<sub>inf</sub></i>), current and optimum mean lengths at first capture (<i>L<sub>c</sub></i>; <i>L<sub>opt_c</sub></i><sub>),</sub> and their ratios of natural and fishing mortality to growth (<i>M</i>/<i>K</i>; <i>F</i>/<i>K</i>). In response to increasing fishing pressure, both species’ maximum lengths declined, along with their <i>B</i>/<i>B<sub>MSY</sub></i> ratio, which declined for <i>C. mystus</i> from 1.7 in 1982 to 0.47 in 2020 and for <i>C. nasus</i> from 1.7 in 2006 (or earlier) to 0.17 in 2020. These assessments show that both of the two <i>Coilia</i> species are overfished, with <i>C. nasus</i> impacted more severely than <i>C. mystus.</i> The prospect for the recovery of these two species is briefly discussed. This contribution will help toward the management of the population of these two <i>Coilia</i> species and provides a basis for evaluating the effect of the 10-year fishing ban in the Yangtze River. |
| first_indexed | 2024-03-09T23:49:38Z |
| format | Article |
| id | doaj.art-4c5a28d0e94a4e2dae93da1f4b82cdd8 |
| institution | Directory Open Access Journal |
| issn | 2410-3888 |
| language | English |
| last_indexed | 2024-03-09T23:49:38Z |
| publishDate | 2022-04-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Fishes |
| spelling | doaj.art-4c5a28d0e94a4e2dae93da1f4b82cdd82023-11-23T16:35:58ZengMDPI AGFishes2410-38882022-04-01739510.3390/fishes7030095Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based ApproachLu Zhai0Zengguang Li1Yongbin Hu2Chengwei Huang3Siquan Tian4Rong Wan5Daniel Pauly6College of Marine Science, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, ChinaCollege of Marine Science, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, ChinaCollege of Marine Science, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, ChinaCollege of Marine Science, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, ChinaCollege of Marine Science, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, ChinaCollege of Marine Science, The Key Laboratory of Sustainable Exploitation of Oceanic Fisheries Resources, National Engineering Research Center for Oceanic Fisheries, Shanghai Ocean University, Shanghai 201306, China<i>Sea Around Us</i>, Institute for the Oceans and Fisheries, University of British Columbia, Vancouver, BC V6T 1Z4, CanadaAn assessment of the stock status and historical changes in abundance of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, was carried out based on field surveys conducted in 2019–2020 and published length-frequency (L/F) data from earlier periods. These two species’ current and past relative biomasses (<i>B</i>/<i>B<sub>MSY</sub>)</i> were estimated using a length-based Bayesian biomass estimation method (LBB). The LLB method also estimated their asymptotic lengths (<i>L<sub>inf</sub></i>), current and optimum mean lengths at first capture (<i>L<sub>c</sub></i>; <i>L<sub>opt_c</sub></i><sub>),</sub> and their ratios of natural and fishing mortality to growth (<i>M</i>/<i>K</i>; <i>F</i>/<i>K</i>). In response to increasing fishing pressure, both species’ maximum lengths declined, along with their <i>B</i>/<i>B<sub>MSY</sub></i> ratio, which declined for <i>C. mystus</i> from 1.7 in 1982 to 0.47 in 2020 and for <i>C. nasus</i> from 1.7 in 2006 (or earlier) to 0.17 in 2020. These assessments show that both of the two <i>Coilia</i> species are overfished, with <i>C. nasus</i> impacted more severely than <i>C. mystus.</i> The prospect for the recovery of these two species is briefly discussed. This contribution will help toward the management of the population of these two <i>Coilia</i> species and provides a basis for evaluating the effect of the 10-year fishing ban in the Yangtze River.https://www.mdpi.com/2410-3888/7/3/95anchoviesbiomass declinesLBB methodoverfishingdam effectsfisheries management and conservation |
| spellingShingle | Lu Zhai Zengguang Li Yongbin Hu Chengwei Huang Siquan Tian Rong Wan Daniel Pauly Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based Approach Fishes anchovies biomass declines LBB method overfishing dam effects fisheries management and conservation |
| title | Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based Approach |
| title_full | Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based Approach |
| title_fullStr | Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based Approach |
| title_full_unstemmed | Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based Approach |
| title_short | Assessment of <i>Coilia mystus</i> and <i>C. nasus</i> in the Yangtze River Estuary, China, Using a Length-Based Approach |
| title_sort | assessment of i coilia mystus i and i c nasus i in the yangtze river estuary china using a length based approach |
| topic | anchovies biomass declines LBB method overfishing dam effects fisheries management and conservation |
| url | https://www.mdpi.com/2410-3888/7/3/95 |
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