Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2014, Vol. 30 ›› Issue (35): 112-115.doi: 10.11924/j.issn.1000-6850.2014-0867

Special Issue: 水产渔业

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Study on the Ammonia Excretion Rate of The Young Taimen with Different Meal Sizes

  

  • Received:2014-03-27 Revised:2014-12-10 Accepted:2014-05-27 Online:2015-03-18 Published:2015-03-18

Abstract: In order to understand the effects of feeding level on ammonia excretion rate of the young taimen (Hucho taimen, Pallas) and formulate more scientific feeding strategies, using the ecological method, the study measured the ammonia excretion rate at three meal sizes. The results showed that, the ammonia excretion rate of three meal sizes were all increased drastically to the maximum, and then decreased slowly to the initial state. DNR and TNR were both prolonged as meal sizes increased. The regression equation of average ammonia excretion rate on the meal size was NRave = 1.1917 + 0.1581m (R2 =0.9783, 2.15%<m<6.36% ). The regression equation of maximum ammonia excretion rate on meal size was NRmax = 1.2516 + 0.2595m (R2 = 0.9706, 2.15%<m<6.36%). The results suggested that it should be appropriate to increase the frequency and reduce feeding amount during the process of juvenile taimen. With the meal size increasing, the amino acids in the body of juvenile taimen increased, and so was the exogenous excretion.