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ISSN:2164-6457 (print)
ISSN:2164-6473 (online)
Journal of Applied Nonlinear Dynamics
Miguel A. F. Sanjuan (editor), Albert C.J. Luo (editor)
Miguel A. F. Sanjuan (editor)

Department of Physics, Universidad Rey Juan Carlos, 28933 Mostoles, Madrid, Spain

Email: miguel.sanjuan@urjc.es

Albert C.J. Luo (editor)

Department of Mechanical and Industrial Engineering, Southern Illinois University Ed-wardsville, IL 62026-1805, USA

Fax: +1 618 650 2555 Email: aluo@siue.edu

Effect of External Wastage and Illegal Harvesting on the Fishery Model of the Halda River Ecosystem in Bangladesh

Journal of Applied Nonlinear Dynamics 11(1) (2022) 33--56 | DOI:10.5890/JAND.2022.03.003

Md. Nazmul Hasan$^1$, Md. Sharif Uddin$^1$, Md. Haider Ali Biswas$^2$

$^1$ Department of Mathematics, Jahangirnagar University, Dhaka, Bangladesh

$^2$ Mathematics Discipline, Khulna University, Khulna, Bangladesh

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Abstract

The Halda, a 98-kilometre long major tributary of Karnaphuli River in the Chattogram Hill Tracts, is the only source of naturally fertilized eggs of carp fishes in South Asia and a great contributor to Bangladesh fisheries sector. Waste from large factories, Hathazari Peaking Power Plant and a housing estate are polluting the water body of Halda river to such an extent that the indigenous sweetwater brood fishes are facing death and the quantity of their release of carp spawn is decreasing. The present paper examines a predatorprey fishery system by taking into account the toxin waste which can lead to polluted system. Both fish species obey the logistic population growth with their respective environmental carrying capacities. The equilibria existed in the model are investigated together with the local and global stability. Bifurcation diagrams are studied to examine the dynamical behaviors of the system. Bionomic equilibria, optimal harvesting policy and Optimal Control Theory are applied to reduce the external toxic substance. Finally, a numerical simulation of the model has been discussed to illustrate the effect of toxicity and their control upon both the predator and the prey species.

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