The Effect Of Feed Rate On Growth And Apparent Digestibility Of Hybridization Juvenile Sturgeon

Sturgeon for its high economic value and unique taxonomic status, has become an important aquaculture species of special. Hybrid sturgeon for its the advantages of its more rapid growth and early sexual maturation has become the main object of the sturgeon breeding category in many countries.At present, the research for sturgeon focused on stocking density, feed development, gonadal development, artificial insemination, etc., and bioenergetics little research.This article studies the level of feeding affecting the growth of hybridization juvenile sturgeon, the establishment of feeding - the growth model to explore the level of the feeding of the energy budget of hybrid sturgeon between the various components of the allocation model, from the point of view of Physiology and ecology to analogy their use of energy measures,provide an important theoretical basis for the aquaculture and fisheries management.The main experimental results are as follows:1. In 18℃-26℃conditions, feeding level (RS) on the hybridization juvenile sturgeon specific growth rate (SGR) has a significant influence (P <0.01), the functional relationship between the two are as follows: y=0.8875x-0.0037 (W -type), y=1.1343x-0.0107 (D -type)。After analysis, the different trends of food conversion efficiency of two types of hybrid sturgeon, namely: W-type feeding level was the largest for 3 percent, D category increasing with the level of feeding,Feed conversion efficiency decline. Application of SPSS system fitting the curve for the mathematical relationship of body length and weight: W=0.083L^2.058(W-type), W=0.102L^1.944(D -type)。2. Different feeding levels on the apparent digestibility of young sturgeon do not always affect the same: Feeding level of W David sturgeon type has an significant impact on apparent digestibility (F=21.706, P=0.002), As the increase of the feeding level ,the apparent digestibility was increased at first, then a downward trend; apparent digestibility level of D-type increase with the food intake decreased, but the one-way ANOVA results F=2.775, P=0.140, Feeding level affecting the level of its apparent digestibility was not significant.3. The ammonia excretion rate of W-type and D type of hybrid sturgeon increases along with the feeding increased ,and feeding levels have significant effects on the W-type ammonia excretion rate of hybrid sturgeon (P=0.004), on D-type hybrid sturgeon was significantly (P <0.001). T test of the ammonia excretion rate of Hybridization sturgeon, results show, W-type ammonia excretion rate was significantly higher than D-type.4. the energy of David W-type hybrid sturgeon increased feeding level increasing, the percentage changes in 14347.21-19986.61J/g, and the impact of feeding levels on physical fitness was significantly (P＜0.001); D-type hybrid sturgeon physical with the increase in feeding level was reduced after the first rising trend , Change in 14182.34-19496.29J / g, the impact of feeding levels on physical fitness is also very significant (P <0.001). Feeding the level of W-type hybrid sturgeon and physical fitness was a clear linear correlation (R² = 0.9367); and a linear relationship of D-type hybrid sturgeon was not obvious (R² = 0.7963).5. The experimental results showed the energy budget equation of a group of eating three square meals of two types of hybridization young sturgeon a group, namely:W-type 100C = 78.26G +0.04 U +9.06 F +12.64 RD-type 100C = 69.31G +0.04 U +1.35 F +29.30 RIn terms of assimilation can be (A = CFU) said that the equation of the energy budget of hybridization juvenile sturgeon:W-type 100A= 86.09G +13.91 RD-type 100A = 70.29G +29.71 R6. Body crude protein and crude fat content of two types of hybrid juvenile sturgeon both decreased with the feeding level and the content of crude ash levels increased with reduced food intake. Body crude protein of feeding level of the four D-type hybrid sturgeon were greater than the W-type; Feeding level for 1.5% and body fat content of hunger hybrid sturgeon of the Group D-type was than W-type, body fat content of D-type was lower than are W-type under the other two feeding levels; crude ash content, only when the feeding level for 3% D -type is greater than the W-type, the other three feeding levels are the W -type greater than D -type.