Estimation of population structure, growth and condition of Lates calcarifer (Bloch, 1790) in the Bay of Bengal
The current study illustrates the life-history traits; including length frequency distribution (LFD), length-weight and length-length relationship (LWR and LLR), condition factors (allometric, KA; Fulton’s, KF; relative condition, KR; relative weight, WR), and natural mortality (Mw) of Lates calcarifer from the Bay of Bengal, Bangladesh. A total of 103 individuals were randomly collected from January to December 2021 using traditional fishing gear including Koral net and gill net. For each individual, total length (TL), standard length (SL), and total body weight (BW) were measured with measuring scale to 0.1 cm and digital balance to 0.1 g precision, respectively. The TL size class 84.0 cm was a numerically dominant group in the population. The b value of LWR (TL vs. BW) indicated positive allometric growth (b=3.28) pattern in the Bay of Bengal. Likewise, the b value of LLR indicated also the same growth pattern. Among the four types of condition factors, KF is the best-suited tool for evaluating the well-being of L. calcarifer. Additionally, WR exhibited significant divergence from 100 (P< 0.0001), defining an imbalanced habitat. The calculated Mw was 0.23 year-1 for L. calcarifer. Therefore, these findings would be used in the future for the improved management of this species in the Bay of Bengal as well as for connecting ecosystems.
| Main Authors: | , , , , , , , , , |
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| Format: | Journal Contribution biblioteca |
| Language: | English |
| Published: |
2022-12-31
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| Subjects: | Bay of Bengal, conditions, growth, Lates calcarifer, natural mortality, ASFA_2015::P::Population structure, ASFA_2015::M::Marine fish, |
| Online Access: | http://hdl.handle.net/1834/42597 |
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| Summary: | The current study illustrates the life-history traits; including length frequency distribution (LFD), length-weight and length-length relationship (LWR and LLR), condition factors (allometric, KA; Fulton’s, KF; relative condition, KR; relative weight, WR), and natural mortality (Mw) of Lates calcarifer from the Bay of Bengal, Bangladesh. A total of 103 individuals were randomly collected from January to December 2021 using traditional fishing gear including Koral net and gill net. For each individual, total length (TL), standard length (SL), and total body weight (BW) were measured with measuring scale to 0.1 cm and digital balance to 0.1 g precision, respectively. The TL size class 84.0 cm was a numerically dominant group in the population. The b value of LWR (TL vs. BW) indicated positive allometric growth (b=3.28) pattern in the Bay of Bengal. Likewise, the b value of LLR indicated also the same growth pattern. Among the four types of condition factors, KF is the best-suited tool for evaluating the well-being of L. calcarifer. Additionally, WR exhibited significant divergence from 100 (P< 0.0001), defining an imbalanced habitat. The calculated Mw was 0.23 year-1 for L. calcarifer. Therefore, these findings would be used in the future for the improved management of this species in the Bay of Bengal as well as for connecting ecosystems. |
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