Population dynamics and stock assessment of Hilsa shad, Tenualosa ilisha (Hamilton, 1822) along the coast of Bangladesh

Authors

  • Md Khairul Islam Department of Zoology, Faculty of Biological Sciences, University of Dhaka, Dhaka 1000, Bangladesh
  • - Md Humayun Center for Development Initiative In Capture Fisheries, Shyamoli, Dhaka, Bangladesh
  • Manmatha Nath Sarker Marine Fisheries Capacity Building Project, Department of Fisheries, Matshya Bhaban Dhaka, Dhaka, Bangladesh
  • - Md Sharifuddin Marine Fisheries Capacity Building Project, Department of Fisheries, Matshya Bhaban Dhaka, Dhaka, Bangladesh
  • M Niamul Naser Department of Zoology, Faculty of Biological Sciences, University of Dhaka, Dhaka 1000, Bangladesh

DOI:

https://doi.org/10.3329/bjz.v48i2.52365

Keywords:

Population Dynamics, Stock assessment, Tenualosa ilisha, Cox's Bazar, Bangladesh

Abstract

Stock Assessment of Tenualosa ilisha (Hamilton, 1822) were estimated using FiSAT-II software with length-frequency data collected from different landing centers. The Southeast Coast of Bay Of Bengal, Cox's Bazar. The Von Bertalanffy growth parameters Land K for the species were asymptotic length (L∞) was 51.41 cm, growth rate (K) was 0.75 year-1 and t0 = -0.2 year respectively. The estimated value of total mortality (Z) based on length converted catch curve using these growth parameters was 2.35 year-1.Natural mortality (M) based on growth parameters and mean environmental temperature (T = 27° C) was 1.00 year-1 and fishing mortality (F) was 1.35 year-1. Optimum length of hilsa at first capture (Lc=L50) was 28.36 cm TL. Growth performance indices (ϕ') was 3.30. The estimated value of the exploitation rate (E) using the length-converted catch curve was 0.57. The recruitment pattern of this species was continuous and two peaks per year. The present investigation clearly showed the over fishing (E > 0.50) condition for T. ilisha in Bangladesh. The estimated length-weight relationship for the combined sex was found to be W = 0.0109 L3. Virtual population analysis (VPA) showed that the maximum fishing mortality occurring in the length between 30 to 35 cm with a maximum value in the length of 32 cm that repeatedly indicate high fishing mortality in the T. ilisha. The generalized length-weight relationship was fitted with the pooled data of all monthly samples were BW = 0.029 TL2.718 (R2= 0.833) respectively. The results revealed that all length-weight relationships were highly correlated (r > 0.993). Maximum sustainable yield (MSY) was estimated as 435,554 t.

Bangladesh J. Zool. 48(2): 231-241, 2020

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Published

2021-04-11

How to Cite

Islam, M. K., Md Humayun, .-., Sarker, M. N., Md Sharifuddin, .-., & Naser, M. N. (2021). Population dynamics and stock assessment of Hilsa shad, Tenualosa ilisha (Hamilton, 1822) along the coast of Bangladesh. Bangladesh Journal of Zoology, 48(2), 231–241. https://doi.org/10.3329/bjz.v48i2.52365

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