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ESTIMATES OF LIFE-HISTORY PARAMETERS AND POPULATION DYNAMICS OF BAGRUS DOCMAK (FORSSKåL, 1775) IN LAKE ABAYA, SOUTH ETHIOPIA

AUTHORS:
Buchale Shishitu Shija
Mentor
Affiliation
South Ethiopia Agricultural Research Institute, Arba Minch Agricultural Research Center
DOI: 10.55041/ijsmt.v2i2.039
CC BY 4.0 License:
This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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Abstract
Sufficient knowledge is necessary for the responsible exploitation of inland fisheries. However, decision-making for fisheries management is unreliable since many inland fisheries lack monitoring. The purpose of this study was to estimate life-history parameters and population dynamics of B. docmak from Lake Abaya. The length-weight data were collected from a total of 1033 fish samples from commercial fisheries of Lake Abaya. The life-history parameters and population dynamics were analyzed with SPSS, and FiSAT II software. An estimate of the length-weight relationship was W = 0.0085L3.04; R2= 0.9118. The mean condition factor was 0.99, 1.01, and 1.00 for females, males, and combined sexes, respectively, and it was highly significant by months’ interaction (P = 0.000). The estimated growth parameters were asymptotic length L∞ = 99.75 cm, growth rate K = 0.55 yr-1, theoretical age to = -0.21, growth performance index Φ′ = 3.74 and life-span tmax =5.24 years. The mortality related parameters were estimated as Z = 1.43 yr-1, M = 0.57 yr-1, E = 0.60, and Z/K = 2.6. The length at first maturity (L50), the length at first capture (Lc), and the optimum length (Lopt) was 52.02 cm, 44.27 cm and 64.37cm, respectively. With biannual pulses in March and September, the recruitment pattern was year-round. It was also estimated that the length at first recruitment (Lr) was 32 cm, and the corresponding age at first recruitment (Tr) was 0.5 years. About 39.5% of the fish in this study were caught before reaching their length at first maturity (L50), and they were subject to overfishing in terms of both recruitment and growth. The exploitation rate (E) in the current investigation was 0.60, while the exploitation rate derived from Y΄/R for E0.5 was 0.35. The current rate of exploitation suggested that B. docmak from Lake Abaya was overexploited. From the management point of view, the exploitation rate should be reduced from 0.60 to 0.35 (42%) to obtain sustainable yield from the fishery of Lake Abaya.
Keywords
Condition factor Exploitation rate Growth pattern Life-history parameters Population dynamics
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0
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CC BY-NC 4.0
Volume/Issue:
Volume Volume 10, Issue 01
Review Rounds:
2
Article Type:
Research Article
Publication Date:
Feb 17 2026
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Shija, B. S. (2026). Estimates of Life-History Parameters and Population Dynamics of Bagrus Docmak (Forsskål, 1775) in Lake Abaya, South Ethiopia. International Journal of Science, Strategic Management and Technology, Volume 10(01). https://doi.org/10.55041/ijsmt.v2i2.039

Shija, Buchale. "Estimates of Life-History Parameters and Population Dynamics of Bagrus Docmak (Forsskål, 1775) in Lake Abaya, South Ethiopia." International Journal of Science, Strategic Management and Technology, vol. Volume 10, no. 01, 2026, pp. . doi:https://doi.org/10.55041/ijsmt.v2i2.039.

Shija, Buchale. "Estimates of Life-History Parameters and Population Dynamics of Bagrus Docmak (Forsskål, 1775) in Lake Abaya, South Ethiopia." International Journal of Science, Strategic Management and Technology Volume 10, no. 01 (2026). https://doi.org/https://doi.org/10.55041/ijsmt.v2i2.039.

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This article has undergone plagiarism screening and double-blind peer review. Editorial policies have been followed. Authors retain copyright under CC BY-NC 4.0 license. The research complies with ethical standards and institutional guidelines.
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