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Comparative growth of Egyptian tilapias in response to declining water temperature


Comparative growth of Egyptian tilapias in response to declining water temperature



Aquaculture 207(3-4): 239-247



ISSN/ISBN: 0044-8486

DOI: 10.1016/s0044-8486(01)00748-7

Growth of Tilapia zillii, Sarotherodon galilaeus, Oreochromis aureus, and three populations of O. niloticus was studied in earthen ponds under declining water temperatures. Throughout 19 weeks of culture, average biweekly temperatures dropped from 32.7 to 15.9 degrees C. Average individual weights of the fish increased from 0.64, 0.45, 0.21, 0.22, 0.12, and 0.15 g to 31.5, 31.8, 65.7, 59.3, 59.6, and 52.9 g for T. zillii, S. galilaeus, O. aureus, and Abbassa, Maryout, and Zawia populations of O. niloticus, respectively. Differences in average individual weight due to genotype were found starting from week 7 after stocking. Final weight differences were caused by genotype (P=0.0001) and sex (P=0.0002). Mean male and female weights differed in all populations except for S. galilaeus. Male weight superiority ranged from 18.1% in S. galilaeus to 54.8% in the Zawia population of O. niloticus. Percent weight increase at temperature less than or equal to 25 degrees C ranged from 93% in O. aureus to 33% in T. zillii. Percent weight increase at temperature less than or equal to 20 degrees C ranged from 43% in Abbassa population of O. niloticus to -3% in T. zillii.

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Accession: 003685339

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