The main objective of this study is to characterize the stock status of two of the most abundant fish species in the commercial catch, Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in order to propose a sustainable management measures for a resilient exploitation of both species. A total of 214 individuals of L. niloticus and 1088 individuals of O. niloticus were measured from July 2018 to November 2018. The total lengths ranged from 9.5 cm to 79.5 cm for L. niloticus and 8 cm to 34 cm for O. niloticus. The weights ranged from 13 g to 6300 g for L. niloticus and from 11 g to 635 g for O. niloticus. The study of the growth dynamics from the frequencies of grouped lengths was done by using the FISAT II software version 1.2.2. The asymptotic lengths found are 83.48 cm and 35.7 cm respectively for L. niloticus and O. niloticus while their respective growth coefficients are 0.03 year-1 and 0.07 year-1. The growth performance indices obtained are Φ' = 2.32 for L. niloticus and Φ' = 1.95 for O. niloticus. Total, natural and fishing mortality rates were Z = 0.33 yr-1, M=0.13yr-1, F = 0.20 yr-1 for L. Niloticus and Z = 0.84 yr-1, M = 0.29yr-1, F = 0.55 yr-1 for O. niloticus. The species at Nangbeto dam lake live in poor habitat conditions with fairly low condition factors 1.88 for L. niloticus and 1.99 for O. niloticus. They both show minority allometry. The weight-length relationship parameters are respectively a = 0.061 and b = 2.54 (r2 = 0.92) and a = 0.067 and b = 2.58 (r2 = 0.96) for L. niloticus and O. niloticus. Both species are over-exploited (E = 0.60 for L. niloticus E = 0.65 for O. niloticus). Overall, given that Nangbeto dam lake has an important place in the supply of protein of halieutic origin to the riparian communities and to the Togolese population, our study revealed that both L. niloticus and O. niloticus are overexploited. The species fishing related mortality rates are far greater than their natural mortality rates. Their total mortality rates are higher than their growth rates. The stocks of both species are undergoing a depletion. An extension of the biological resting period and the regulation of the fishing mesh sizes could be implemented as sustainable management measures for the renewal of fish stocks in the Nangbeto dam lake.
Published in | International Journal of Applied Agricultural Sciences (Volume 8, Issue 4) |
DOI | 10.11648/j.ijaas.20220804.17 |
Page(s) | 185-191 |
Creative Commons |
This is an Open Access article, distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution and reproduction in any medium or format, provided the original work is properly cited. |
Copyright |
Copyright © The Author(s), 2022. Published by Science Publishing Group |
Growth Dynamics, Lates niloticus, Oreochromis niloticus, Weight-Length, Nangbeto Dam Lake
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APA Style
Gnimassoun Gbêssi Jean Baptiste, Serigne Modou Sarr, Assou Delagnon, Segniagbeto Hoinsoude Gabriel. (2022). Comparative Growth Dynamics and Exploitation of Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in the Nangbeto Dam Lake in Togo. International Journal of Applied Agricultural Sciences, 8(4), 185-191. https://doi.org/10.11648/j.ijaas.20220804.17
ACS Style
Gnimassoun Gbêssi Jean Baptiste; Serigne Modou Sarr; Assou Delagnon; Segniagbeto Hoinsoude Gabriel. Comparative Growth Dynamics and Exploitation of Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in the Nangbeto Dam Lake in Togo. Int. J. Appl. Agric. Sci. 2022, 8(4), 185-191. doi: 10.11648/j.ijaas.20220804.17
AMA Style
Gnimassoun Gbêssi Jean Baptiste, Serigne Modou Sarr, Assou Delagnon, Segniagbeto Hoinsoude Gabriel. Comparative Growth Dynamics and Exploitation of Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in the Nangbeto Dam Lake in Togo. Int J Appl Agric Sci. 2022;8(4):185-191. doi: 10.11648/j.ijaas.20220804.17
@article{10.11648/j.ijaas.20220804.17, author = {Gnimassoun Gbêssi Jean Baptiste and Serigne Modou Sarr and Assou Delagnon and Segniagbeto Hoinsoude Gabriel}, title = {Comparative Growth Dynamics and Exploitation of Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in the Nangbeto Dam Lake in Togo}, journal = {International Journal of Applied Agricultural Sciences}, volume = {8}, number = {4}, pages = {185-191}, doi = {10.11648/j.ijaas.20220804.17}, url = {https://doi.org/10.11648/j.ijaas.20220804.17}, eprint = {https://article.sciencepublishinggroup.com/pdf/10.11648.j.ijaas.20220804.17}, abstract = {The main objective of this study is to characterize the stock status of two of the most abundant fish species in the commercial catch, Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in order to propose a sustainable management measures for a resilient exploitation of both species. A total of 214 individuals of L. niloticus and 1088 individuals of O. niloticus were measured from July 2018 to November 2018. The total lengths ranged from 9.5 cm to 79.5 cm for L. niloticus and 8 cm to 34 cm for O. niloticus. The weights ranged from 13 g to 6300 g for L. niloticus and from 11 g to 635 g for O. niloticus. The study of the growth dynamics from the frequencies of grouped lengths was done by using the FISAT II software version 1.2.2. The asymptotic lengths found are 83.48 cm and 35.7 cm respectively for L. niloticus and O. niloticus while their respective growth coefficients are 0.03 year-1 and 0.07 year-1. The growth performance indices obtained are Φ' = 2.32 for L. niloticus and Φ' = 1.95 for O. niloticus. Total, natural and fishing mortality rates were Z = 0.33 yr-1, M=0.13yr-1, F = 0.20 yr-1 for L. Niloticus and Z = 0.84 yr-1, M = 0.29yr-1, F = 0.55 yr-1 for O. niloticus. The species at Nangbeto dam lake live in poor habitat conditions with fairly low condition factors 1.88 for L. niloticus and 1.99 for O. niloticus. They both show minority allometry. The weight-length relationship parameters are respectively a = 0.061 and b = 2.54 (r2 = 0.92) and a = 0.067 and b = 2.58 (r2 = 0.96) for L. niloticus and O. niloticus. Both species are over-exploited (E = 0.60 for L. niloticus E = 0.65 for O. niloticus). Overall, given that Nangbeto dam lake has an important place in the supply of protein of halieutic origin to the riparian communities and to the Togolese population, our study revealed that both L. niloticus and O. niloticus are overexploited. The species fishing related mortality rates are far greater than their natural mortality rates. Their total mortality rates are higher than their growth rates. The stocks of both species are undergoing a depletion. An extension of the biological resting period and the regulation of the fishing mesh sizes could be implemented as sustainable management measures for the renewal of fish stocks in the Nangbeto dam lake.}, year = {2022} }
TY - JOUR T1 - Comparative Growth Dynamics and Exploitation of Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in the Nangbeto Dam Lake in Togo AU - Gnimassoun Gbêssi Jean Baptiste AU - Serigne Modou Sarr AU - Assou Delagnon AU - Segniagbeto Hoinsoude Gabriel Y1 - 2022/08/31 PY - 2022 N1 - https://doi.org/10.11648/j.ijaas.20220804.17 DO - 10.11648/j.ijaas.20220804.17 T2 - International Journal of Applied Agricultural Sciences JF - International Journal of Applied Agricultural Sciences JO - International Journal of Applied Agricultural Sciences SP - 185 EP - 191 PB - Science Publishing Group SN - 2469-7885 UR - https://doi.org/10.11648/j.ijaas.20220804.17 AB - The main objective of this study is to characterize the stock status of two of the most abundant fish species in the commercial catch, Lates niloticus (Linnaeus, 1758) and Oreochromis niloticus (Linnaeus, 1758) in order to propose a sustainable management measures for a resilient exploitation of both species. A total of 214 individuals of L. niloticus and 1088 individuals of O. niloticus were measured from July 2018 to November 2018. The total lengths ranged from 9.5 cm to 79.5 cm for L. niloticus and 8 cm to 34 cm for O. niloticus. The weights ranged from 13 g to 6300 g for L. niloticus and from 11 g to 635 g for O. niloticus. The study of the growth dynamics from the frequencies of grouped lengths was done by using the FISAT II software version 1.2.2. The asymptotic lengths found are 83.48 cm and 35.7 cm respectively for L. niloticus and O. niloticus while their respective growth coefficients are 0.03 year-1 and 0.07 year-1. The growth performance indices obtained are Φ' = 2.32 for L. niloticus and Φ' = 1.95 for O. niloticus. Total, natural and fishing mortality rates were Z = 0.33 yr-1, M=0.13yr-1, F = 0.20 yr-1 for L. Niloticus and Z = 0.84 yr-1, M = 0.29yr-1, F = 0.55 yr-1 for O. niloticus. The species at Nangbeto dam lake live in poor habitat conditions with fairly low condition factors 1.88 for L. niloticus and 1.99 for O. niloticus. They both show minority allometry. The weight-length relationship parameters are respectively a = 0.061 and b = 2.54 (r2 = 0.92) and a = 0.067 and b = 2.58 (r2 = 0.96) for L. niloticus and O. niloticus. Both species are over-exploited (E = 0.60 for L. niloticus E = 0.65 for O. niloticus). Overall, given that Nangbeto dam lake has an important place in the supply of protein of halieutic origin to the riparian communities and to the Togolese population, our study revealed that both L. niloticus and O. niloticus are overexploited. The species fishing related mortality rates are far greater than their natural mortality rates. Their total mortality rates are higher than their growth rates. The stocks of both species are undergoing a depletion. An extension of the biological resting period and the regulation of the fishing mesh sizes could be implemented as sustainable management measures for the renewal of fish stocks in the Nangbeto dam lake. VL - 8 IS - 4 ER -