Length-weight relationships and condition factors of mono- and mixed-sex Nile tilapia (Oreochromis niloticus) in open water cage culture system

  • Saznzib Kumar Barman Department of Fishery Resources Conservation and Management, Faculty of Fisheries and Ocean Sciences, Khulna Agricultural University, Khulna 9100, Bangladesh; Department of Aquatic Resource Management, Faculty of Fisheries, Sylhet Agricultural University, Sylhet 3100, Bangladesh
  • Bhupal Ronjon Das Department of Aquatic Resource Management, Faculty of Fisheries, Sylhet Agricultural University, Sylhet 3100, Bangladesh
  • Mrityunjoy Kunda Department of Aquatic Resource Management, Faculty of Fisheries, Sylhet Agricultural University, Sylhet 3100, Bangladesh
  • Sabuj Kanti Mazumder Department of Genetics and Fish Breeding, Bangabandhu Sheikh Mujibur Rahman Agricultural University, Gazipur 1706, Bangladesh
  • Md. Jasim Uddin Department of Fisheries Management, Faculty of Fisheries, Bangladesh Agricultural University, Mymensingh 2202, Bangladesh
  • Partho Protim Barman Department of Coastal and Marine Fisheries, Sylhet Agricultural University, Sylhet 3100, Bangladesh
Keywords: Fulton condition factor, length-weight relationship, open water cage culture, Oreochromis niloticus, relative condition factor


The current study compared the length-weight relationships and condition factors in mono- and mixed-sex Nile tilapia (Oreochromis niloticus). The trial lasted for 91 days and included two treatments with five replications for each, all with the same stocking density. During the study period, 20 randomly selected fish individuals were measured and recorded from each cage every two weeks. The observed growth trend was allometric, with no significant difference in the mean exponential values (b), 2.696 and 2.65 for mono and mixed-sex tilapia respectively. There was a significant difference in final weight gain between monosex (171.58±7.39 g) and mixed-sex (149.09±4.14 g) tilapia. There was no significant difference in final length between monosex (19.80±0.42 cm) and mixed-sex (19.80±0.42 cm) tilapia. Moreover, the mean correlation coefficient (r2) of both groups was positive. The Fulton condition factor (K) also varies from 0.700 to 1.000 (monosex) and 1.000 to 1.010 (mixed-sex). The relative condition factor (Kn) for monosex and mixed-sex tilapia ranged from 1.96 to 2.222 and 2.092 to 2.35 respectively, indicated good aquaculture conditions. The present findings will attract fish farmers to mixed-sex tilapia culture by allowing them to lessen hormone administration and expected to boost national fish production through open water cage aquaculture.


Aktar MJ, Islam MJ, Barman SK, Kunda M (2020) Assessment of fish biodiversity in the Teesta River of Banladesh. Journal of Sylhet Agricultural University 7(2): 95–114.

Asmamaw B, Beyene B, Tessema M, Assefa A (2019) Length-weight relationships and condition factor of Nile tilapia, Oreochromis niloticus (Linnaeus, 1758) (Cichlidae) in Koka Reservoir, Ethiopia. International Journal of Fisheries and Aquatic Research 4: 47–51.

Balcázar JL, Aguirre A, Gómez G, Paredes W (2006) Culture of hybrid red tilapia (Oreochromis mossambicus × Oreochromis niloticus) in marine cages: effects of stocking density on survival and growth. University of Zaragoza, Zaragoza, Spain.

Barman SK, Kunda M, Mazumder SK, Nahiduzzaman M, Barman PP, Das SK (2021) Fish-diversity in the Kura River of Bangladesh: patterns and threats. Malayasian Applied Biology 50: 1–14.

Bhat AA, Arafat MY, Parveen M, Bakhtiyar Y (2022) Comparative account on the length-weight and length-length relationships and condition factor of six cyprinid fishes from Dal Lake, Kashmir. Journal of Fisheries 10(3): 103202.

Bhuyain ASMSR, Barman SK, Hossain MM, Khan MMH, Mim KK, Mazumder SK (2022) Seasonal dynamics of heavy metal concentrations in water and fish from Hakaluki Haor of Bangladesh. Conservation 2(3): 473–484.

Chakraborty SB, Mazumdar D, Chatterji U, Banerjee S (2011) Growth of mixed-sex and monosex Nile tilapia in different culture systems. Turkish Journal of Fisheries and Aquatic Sciences 11: 133–140.

Crab R, Kochva M, Verstraete W, Avnimelech Y (2009) Bio-flocs technology application in over-wintering of tilapia. Aquacultural Engineering 40: 105–112.

Dan-Kishiya AS (2013) Length-weight relationship and condition factor of five fish species from a tropical water supply reservoir in Abuja, Nigeria. American Journal of Research Communication 1: 175–187.

Das UN, Jana P, Pahari T, Roy A, Dhara K (2018) Comparative study on growth performance and economics between GIFT and local varieties of Oreochromis niloticus (Linnaeus, 1758) reared in pond culture systems. International Journal of Pure & Applied Bioscience 6: 603–610.

Deb AR, Kunda M, Marine SS, Islam MJ (2020) Study on production performance and economic benefits between mixed-sex and mono-sex tilapia (Oreochromis niloticus). Journal of Fisheries and Aquaculture Research 5: 61–70.

Froese R (2006) Cube law, condition factor and weight-length relationships: history, meta-analysis and recommendations. Journal of Applied Ichthyology 22(4): 241–253.

Fulton TW (1904) The rate of growth of fishes. Twentysecond Annual Report, Part III. Fishes Board of Scotland, Edinburgh. pp. 141–241.

Githukia CM, Ogello EO, Kembenya EM, Achieng AO, Obiero KO, Munguti JM (2015) Comparative growth performance of male monosex and mixed sex Nile tilapia (Oreochromis niloticus L.) reared in earthen ponds. Croatian Journal of Fisheries 73: 20–25.

Ighwela KA, Ahmed A Bin, Abol-Munaf AB (2011) Condition factor as an indicator of growth and feeding intensity of Nile tilapia fingerlings (Oreochromis niloticus) feed on different levels of maltose. American-Eurasian Journal of Agricultural and Environmental Science 11: 559–563.

Islam MA, Islam MJ, Arefin S, Rashid A, Barman SK (2016) Factors affecting the fisheries biodiversity of Ratargul Swamp Forest of Sylhet district, Bangladesh. IOSR Journal of Environmental Science, Toxicology and Food Technology 10(1): 60–65.

Islam MA, Islam MJ, Barman SK, Morshed F, Marine SS (2015) Study on present status of fish biodiversity in wetlands of Sylhet district, Bangladesh. Agriculture, Forestry and Fisheries 4: 296–299.

Kunda M, Pandit D, Harun-Al-Rashid A (2021) Optimization of stocking density for mono-sex Nile tilapia (Oreochromis niloticus) production in riverine cage culture in Bangladesh. Heliyon 7(11): e08334.

Kuwaye TT, Okimoto DK, Shimoda SK, Howerton RD, Lin HR, ... Grau EG (1993) Effect of 17α-methyltestosterone on the growth of the euryhaline tilapia, Oreochromis mossambicus, in fresh water and in sea water. Aquaculture 113(1-2): 137–152.

Le Cren ED (1951) The length-weight relationship and seasonal cycle in gonad weights and condition in the perch (Perca fluviatilis). The Journal of Animal Ecology 20(2): 201–219.

Moniruzzaman M, Uddin KB, Basak S, Mahmud Y, Zaher M, Bai SC (2015) Effects of stocking density on growth, body composition, yield and economic returns of monosex tilapia (Oreochromis niloticus L.) under cage culture system in Kaptai Lake of Bangladesh. Journal of Aquaculture Research and Development 6(8): 1.

Ogello EO, Kembenya EM, Githukia CM, Aera CN, Munguti JM, Nyamweya CS (2017) Substitution of fish meal with sunflower seed meal in diets for Nile tilapia (Oreochromis niloticus L.) reared in earthen ponds. Journal of Applied Aquaculture 29(1): 81–99.

Ridha MT (2011) Evaluation of monosex culture of GIFT and non-improved strains of Nile tilapia Oreochromis niloticus in recirculating tanks. International Aquatic Research (Islamic Azad University, Tonekabon Branch) 3(3): 189–195.

Siddik MAB, Nahar A, Ahamed F, Hossain MY (2014) Over-wintering growth performance of mixed-Sex and mono-sex Nile tilapia Oreochromis niloticus in the Northeastern Bangladesh. Croatian Journal of Fisheries 72: 70–76.

Thongprajukaew K, Kovitvadhi S, Kovitvadhi U, Preprame P (2017) Effects of feeding frequency on growth performance and digestive enzyme activity of sex-reversed Nile tilapia, Oreochromis niloticus (Linnaeus, 1758). Agriculture and Natural Resources 51(4): 292–298.

Ude EF, Ugwu LLC, Mgbenka BO, Nwani CD (2011) Evaluation of length-weight relationship of fish species of Ebonyi River, Nigeria. Nigerian Journal of Fisheries 8(1): 136–144.

Vasconcelos FR, Menezes RF, Attayde LJ (2018) Effects of the Nile tilapia (Oreochromis niloticus L.) on the plankton community of a tropical reservoir during and after an algal bloom. Hydrobiologia 817: 393–401.

How to Cite
Barman, S. K., Das, B. R., Kunda, M., Mazumder, S. K., Uddin, M. J., & Barman, P. P. (2023). Length-weight relationships and condition factors of mono- and mixed-sex Nile tilapia (Oreochromis niloticus) in open water cage culture system. Journal of Fisheries, 11(1), 111204. https://doi.org/10.17017/j.fish.431