First record on size at sexual maturity and optimum catchable length of 10 marine fishes from the Bay of Bengal (Bangladesh) through multi-models approach: a key for sound fisheries management
Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish spec...
Ausführliche Beschreibung
Gespeichert in:
| Autor*in: |
Mawa, Zannatul [verfasserIn] |
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| Format: |
Artikel |
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| Sprache: |
Englisch |
| Erschienen: |
2021 |
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| Schlagwörter: |
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| Anmerkung: |
© The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 |
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| Übergeordnetes Werk: |
Enthalten in: Environmental science and pollution research - Springer Berlin Heidelberg, 1994, 28(2021), 28 vom: 16. März, Seite 38117-38127 |
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| Übergeordnetes Werk: |
volume:28 ; year:2021 ; number:28 ; day:16 ; month:03 ; pages:38117-38127 |
| Links: |
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| DOI / URN: |
10.1007/s11356-021-13491-8 |
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OLC212681923X |
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| 520 | |a Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). | ||
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| 650 | 4 | |a Size at sexual maturity | |
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| 700 | 1 | |a Rahman, Md. Ashekur |4 aut | |
| 700 | 1 | |a Sarmin, Most. Shakila |4 aut | |
| 700 | 1 | |a Habib, Kazi Ahsan |4 aut | |
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10.1007/s11356-021-13491-8 doi (DE-627)OLC212681923X (DE-He213)s11356-021-13491-8-p DE-627 ger DE-627 rakwb eng 570 360 333.7 VZ 690 333.7 540 VZ BIODIV DE-30 fid Mawa, Zannatul verfasserin aut First record on size at sexual maturity and optimum catchable length of 10 marine fishes from the Bay of Bengal (Bangladesh) through multi-models approach: a key for sound fisheries management 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). Marine fishes Size at sexual maturity Optimum catchable length Bay of Bengal Hossain, Md. Yeamin (orcid)0000-0002-8183-7296 aut Hasan, Md. Rabiul aut Tanjin, Sumaya aut Rahman, Md. Ashekur aut Sarmin, Most. Shakila aut Habib, Kazi Ahsan aut Enthalten in Environmental science and pollution research Springer Berlin Heidelberg, 1994 28(2021), 28 vom: 16. März, Seite 38117-38127 (DE-627)171335805 (DE-600)1178791-0 (DE-576)038875101 0944-1344 nnns volume:28 year:2021 number:28 day:16 month:03 pages:38117-38127 https://doi.org/10.1007/s11356-021-13491-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR GBV_ILN_252 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 AR 28 2021 28 16 03 38117-38127 |
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10.1007/s11356-021-13491-8 doi (DE-627)OLC212681923X (DE-He213)s11356-021-13491-8-p DE-627 ger DE-627 rakwb eng 570 360 333.7 VZ 690 333.7 540 VZ BIODIV DE-30 fid Mawa, Zannatul verfasserin aut First record on size at sexual maturity and optimum catchable length of 10 marine fishes from the Bay of Bengal (Bangladesh) through multi-models approach: a key for sound fisheries management 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). Marine fishes Size at sexual maturity Optimum catchable length Bay of Bengal Hossain, Md. Yeamin (orcid)0000-0002-8183-7296 aut Hasan, Md. Rabiul aut Tanjin, Sumaya aut Rahman, Md. Ashekur aut Sarmin, Most. Shakila aut Habib, Kazi Ahsan aut Enthalten in Environmental science and pollution research Springer Berlin Heidelberg, 1994 28(2021), 28 vom: 16. März, Seite 38117-38127 (DE-627)171335805 (DE-600)1178791-0 (DE-576)038875101 0944-1344 nnns volume:28 year:2021 number:28 day:16 month:03 pages:38117-38127 https://doi.org/10.1007/s11356-021-13491-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR GBV_ILN_252 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 AR 28 2021 28 16 03 38117-38127 |
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10.1007/s11356-021-13491-8 doi (DE-627)OLC212681923X (DE-He213)s11356-021-13491-8-p DE-627 ger DE-627 rakwb eng 570 360 333.7 VZ 690 333.7 540 VZ BIODIV DE-30 fid Mawa, Zannatul verfasserin aut First record on size at sexual maturity and optimum catchable length of 10 marine fishes from the Bay of Bengal (Bangladesh) through multi-models approach: a key for sound fisheries management 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). Marine fishes Size at sexual maturity Optimum catchable length Bay of Bengal Hossain, Md. Yeamin (orcid)0000-0002-8183-7296 aut Hasan, Md. Rabiul aut Tanjin, Sumaya aut Rahman, Md. Ashekur aut Sarmin, Most. Shakila aut Habib, Kazi Ahsan aut Enthalten in Environmental science and pollution research Springer Berlin Heidelberg, 1994 28(2021), 28 vom: 16. März, Seite 38117-38127 (DE-627)171335805 (DE-600)1178791-0 (DE-576)038875101 0944-1344 nnns volume:28 year:2021 number:28 day:16 month:03 pages:38117-38127 https://doi.org/10.1007/s11356-021-13491-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR GBV_ILN_252 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 AR 28 2021 28 16 03 38117-38127 |
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10.1007/s11356-021-13491-8 doi (DE-627)OLC212681923X (DE-He213)s11356-021-13491-8-p DE-627 ger DE-627 rakwb eng 570 360 333.7 VZ 690 333.7 540 VZ BIODIV DE-30 fid Mawa, Zannatul verfasserin aut First record on size at sexual maturity and optimum catchable length of 10 marine fishes from the Bay of Bengal (Bangladesh) through multi-models approach: a key for sound fisheries management 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). Marine fishes Size at sexual maturity Optimum catchable length Bay of Bengal Hossain, Md. Yeamin (orcid)0000-0002-8183-7296 aut Hasan, Md. Rabiul aut Tanjin, Sumaya aut Rahman, Md. Ashekur aut Sarmin, Most. Shakila aut Habib, Kazi Ahsan aut Enthalten in Environmental science and pollution research Springer Berlin Heidelberg, 1994 28(2021), 28 vom: 16. März, Seite 38117-38127 (DE-627)171335805 (DE-600)1178791-0 (DE-576)038875101 0944-1344 nnns volume:28 year:2021 number:28 day:16 month:03 pages:38117-38127 https://doi.org/10.1007/s11356-021-13491-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR GBV_ILN_252 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 AR 28 2021 28 16 03 38117-38127 |
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10.1007/s11356-021-13491-8 doi (DE-627)OLC212681923X (DE-He213)s11356-021-13491-8-p DE-627 ger DE-627 rakwb eng 570 360 333.7 VZ 690 333.7 540 VZ BIODIV DE-30 fid Mawa, Zannatul verfasserin aut First record on size at sexual maturity and optimum catchable length of 10 marine fishes from the Bay of Bengal (Bangladesh) through multi-models approach: a key for sound fisheries management 2021 Text txt rdacontent ohne Hilfsmittel zu benutzen n rdamedia Band nc rdacarrier © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). Marine fishes Size at sexual maturity Optimum catchable length Bay of Bengal Hossain, Md. Yeamin (orcid)0000-0002-8183-7296 aut Hasan, Md. Rabiul aut Tanjin, Sumaya aut Rahman, Md. Ashekur aut Sarmin, Most. Shakila aut Habib, Kazi Ahsan aut Enthalten in Environmental science and pollution research Springer Berlin Heidelberg, 1994 28(2021), 28 vom: 16. März, Seite 38117-38127 (DE-627)171335805 (DE-600)1178791-0 (DE-576)038875101 0944-1344 nnns volume:28 year:2021 number:28 day:16 month:03 pages:38117-38127 https://doi.org/10.1007/s11356-021-13491-8 lizenzpflichtig Volltext GBV_USEFLAG_A SYSFLAG_A GBV_OLC FID-BIODIV SSG-OLC-UMW SSG-OLC-ARC SSG-OLC-TEC SSG-OLC-CHE SSG-OLC-FOR GBV_ILN_252 GBV_ILN_267 GBV_ILN_2018 GBV_ILN_4277 AR 28 2021 28 16 03 38117-38127 |
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First record on size at sexual maturity and optimum catchable length of 10 marine fishes from the Bay of Bengal (Bangladesh) through multi-models approach: a key for sound fisheries management |
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Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 |
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Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 |
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Abstract Appropriate management systems for the protection of fishes are mostly relying on the information of size at sexual maturity and optimum catchable length. The purpose of this research was to estimate the size at sexual maturity (Lm) and optimum catchable length (Lopt) of 10 marine fish species from the Bay of Bengal (Bangladesh) through multi-models using commercial catches from October 2019 to September 2020. Also, we calculated the Lm and Lopt of these species from worldwide water bodies based on maximum length (Lmax). A total of 2967 specimens of 10 fish species were evaluated in the current study and total length (TL) was noted up to 0.1 cm using a measuring board, while body weight (BW) and gonad weight (GW) are weighed by digital electronic balance with 0.01 g accuracy. To assess the Lm, three different models such as (i) empirical model based on Lmax, (ii) the relationship between TL (total length in cm) vs. GSI (gonadosomatic index in %), and (iii) logistic model were considered and Lopt was assessed based on L∞. The estimated lowest Lm was 11.8 cm (Lmax-based), 12.8 cm (TL vs. GSI), and 13.7 cm (logistic model) for Thryssa setirostris and highest Lm was 23.3, 20.5, and 22.0 cm for Priacanthus macracanthus through Lmax, TL vs. GSI, and logistic-based models, respectively. From these three models, the lowest mean value of Lm was obtained for T. setirostris (12.7 cm) and highest was recorded for P. macracanthus (21.9 cm). Fifty percent of mature marine species was in 14.9 cm TL and 90% species was in 19.5 cm TL. The smallest Lopt was obtained as 13.4 cm TL for T. setirostris and largest was 28.2 cm TL for P. macracanthus. This study was generated data on Lm and Lopt for 10 newly marine species, which are globally absent. Therefore, this study will be helpful for developing sustainable management strategies and conservation of marine fishes through the implementation of mesh size based on the size at sexual maturity (Lm) and optimum catchable length (Lopt). © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2021 |
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