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Evaluation of growth performance of JA tilapia(NEW GIFT strain O.niloticus♀×O.aureus♂)

CHEN Lin1,LI Si-fa1,JIAN Wei-ye2,HE Xue-jun1,LI Xian-ren1,CAI Wan-qi1 (1.Key Laboratory of Aquatic Genetic Resources and Aquacultural Ecosytem Cetificated by the Ministry of Agriculture,Shanghai Fisheries University,Shanghai 200090,China;2.Wei Ye Seeding Farm of improved tilapias,Maomin 525000,China)  
A comparison study on the growth performance of new crossbreed of tilapia was carried out by using newly developed hybrid of NEW GIFT strain O.niloticus ♀ × O.aureus ♂ as testing group,O.niloticus and O.niloticus ♀ × O.aureus ♂ cultured popularly,and their respective parents NEW GIFT strain O.niloticus,O.niloticus,O.aureus as control group.Major results :(1)Absolute growth rate(g/d): NEW GIFT NEW GIFT ♀ × O.aureus ♂ O.niloticus O.niloticus ♀ × O.aureus ♂ O.aureus,NEW GIFT ♀ × O.aureus ♂ was 19.4% lower than NEW GIFT but 60.3%,10.8%,112% higher than O.niloticus ♀ × O.aureus ♂,O.niloticus,O.niloticus respectively.There were most significant differences between any one of the other three tilapias and NEW GIFT ♀ × O.aureus ♂(P0.01) except O.niloticus and NEW GIFT ♀ × O.aureus ♂(P0.05).(2)CV(%): NEW GIFT NEW GIFT ♀ × O.aureus ♂ O.niloticus O.niloticus ♀ × O.aureus ♂ O.aureus,amoung them NEW GIFT ♀ × O.aureus ♂ was 31.1%,17.4% lower than O.niloticus ♀ × O.aureus ♂,O.niloticus,there were no significant differences between any one of the other three tilapias and NEW GIFT ♀ × O.aureus ♂(P0.05) except O.niloticus ♀ × O.aureus ♂ and NEW GIFT ♀ × O.aureus ♂(P0.01).(3)Surival rates(%): NEW GIFT NEW GIFT ♀ × O.aureus ♂ O.niloticus O.niloticus ♀ × O.aureus ♂ O.aureus,thereinto,NEW GIFT ♀ × O.aureus ♂ is 96.5% almost as NEW GIFT (96.7%) but 9.4%,3.4%,20.6% higher than O.niloticus ♀ × O.aureus ♂,O.niloticus,O.niloticus respectively,there were most significant differences between any one of three tilapias and NEW GIFT ♀ × O.aureus ♂(P0.01)except NEW GIFT strain O.niloticus and NEW GIFT strain O.niloticus ♀ × O.aureus ♂(P0.05).(4)In a word,compared with O.niloticus ♀ × O.aureus ♂,the new crossbreed showed a 60.3% higher absolute growth rate(g/d) and 9.4 % higher surival rate,27.5% lower variation coefficients.It indicates that the new crossbreed of NEW GIFT ♀ × O.aureus ♂ is a good variety in growth-performance.
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