Growth comparison of Asian Nile and red tilapia strains in controlled and uncontrolled farm conditions |
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| Authors: | Maria Rowena R Romana-Eguia Minoru Ikeda Zubaida U Basiao Nobuhiko Taniguchi |
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| Institution: | (1) Southeast Asian Fisheries Development Center, Aquaculture Department (SEAFDEC/AQD), Binangonan, 1940 Rizal, Philippines;(2) Laboratory of Applied Population Genetics Informatics, Graduate School of Agricultural Science, Tohoku University, 1-1 Amamiya-machi, Tsutsumi-dori, Aoba-ku Sendai, Miyagi 985-8555, Japan;(3) Institute of Biology, University of the Philippines, Diliman, Quezon City, Philippines |
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| Abstract: | Growth of several genetically improved Nile tilapia (GIFT or Genetically Improved Farmed Tilapia, FaST or Freshwater Aquaculture
Center Selected Tilapia, SEAFDEC-selected) and domesticated red tilapia (BFS or Binangonan Freshwater Station, NIFI-red or
National Inland Fisheries Institute red, HL or Hacienda Luisita) stocks were compared in controlled (tank) and uncontrolled
farm conditions (lake-based cages) with unselected NIFI or Chitralada Nile tilapia as control. Specific growth rate differed
significantly (P = 0.009) in tank-reared Nile tilapia stocks where GIFT grew best at 1.358%/day followed by FaST (1.307%/day), control stock
NIFI (1.257%/day) and SEAFDEC-selected (1.202%/day). Genetic effect explained 84.4% of the variance in growth of Nile tilapia
in tanks. Although Nile tilapia growth in cages followed the same trend where GIFT grew best at 1.570%/day, no significant
stock differences (P = 0.479) were noted. Meanwhile, red tilapia reared in either tanks or cages showed no significant stock differences in terms
of growth. However, survival of the red tilapia stocks in cages differed significantly with HL having the highest percentage
survival at 93.3%. The different growth responses of the Nile tilapia stocks especially under controlled (tank) farm conditions
were largely due to genetic factors (stock differences).Under uncontrolled farm conditions, environmental factors were generally
observed to have also affected the survival and to some extent, the growth of Asian Nile and red tilapia stocks. |
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