Length-Weight Relationship and Condition Factor of Oreochromis niloticus (Linnaeus, 1758) in Selected Tropical Reservoirs of Ekiti State, Southwest Nigeria

Olagbemide P. T.; Owolabi O. D.

doi:10.18006/2023.11(4).707.719

Authors

Olagbemide P. T. Department of Biological Sciences, Afe Babalola University, Ado-Ekiti, Nigeria https://orcid.org/0000-0003-4127-8132
Owolabi O. D. Department of Zoology, University of Ilorin, Ilorin; Nigeria

DOI:

https://doi.org/10.18006/2023.11(4).707.719

Keywords:

Length-weight relationship, Oreochromis niloticus, Condition factor, Growth pattern

Abstract

In Ekiti State, southwest Nigeria, Oreochromis niloticus is significant to live. This investigation was conducted to improve its sustainable management and access the length-weight relationship and condition factor of O. niloticus across important reservoirs in Ekiti State from November 2017 to October 2019. Collected specimens were weighed to the nearest gram, while the entire lengths were measured to the closest centimetre. Log-transformed regression was used to determine the fish's growth pattern in the reservoirs. The gradient comparison was done using the T-test. The length and weight of the species in the reservoirs showed a significant association. All length-weight relationships had r² values greater than 0.8150 and were significant at P < 0.05. In the length-weight relationship of O. niloticus, the values of the exponent b in Egbe, Ero, and Ureje reservoirs varied from 2.45 to 2.87, 3.02 to 3.20, and 2.45 to 2.82, respectively. The results of regression coefficient b obtained showed that in the combined season, male, female and combined sexes from the Ero reservoir had isometric growth patterns with growth exponent b values of 3.18, 3.20 and 3.19 respectively that were not statistically different from 3. These results contradicted the negative allometric growth pattern in the Egbe and Ureje reservoirs. The condition factor during the dry season ranged from 1.93-2.05, 2.05-2.11, and 1.93-2.03 for fish in Egbe, Ero, and Ureje reservoirs, respectively while in the rainy season, it ranged from 2.00-2.02; 2.08-2.09 and 1.96-2.01 respectively. The fish species studied in the reservoirs lived above- average life and thus indicate that the prevailing ecological conditions in the reservoirs were not beyond the forbearance range for the fish species since their condition factors were within the range considered adequate for freshwater fishes in tropical waters.

Author Biography

Olagbemide P. T., Department of Biological Sciences, Afe Babalola University, Ado-Ekiti, Nigeria

Department of Zoology, University of Ilorin, Ilorin; Nigeria

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