Investigation and analysis of the growth differences of larvae to adult stage of Litopenaeus vannamei

Abstract:

In order to investigate the growth differences of individuals from larvae to adult stage, the samples were collected on the 28th day, the 38th day, the 48th day, the 58th day, the 68th day and the 73th day. Firstly, take the 28th day sample, calculate the proportion of different weight; According to the first 10% (14), 10% (14) near the middle, the last 10% (14) of weight ranking defines the growth rate is high, middle or low. Secondly,the body length and body weight of the shrimp were fitted by power function and linear regression. Thirdly, all the samples were calculated the absolute growth and relative growth. The results showed different growth rates of three groups at the same growth period (P>95%), the growth rate of different shrimp as a whole to analyze whether there may be some deviation. Secondly, the power function of W_all=1×10^-5L^3.0051, the linear equation y_all=3x-4.92, the linear equation group with different growth rates were y_high=3.41x-5.71, y_middle=3.21x-5.30, y_low=2.92x-4.78; Linear equation of the slope was positively correlated with the growth rate, and three sets of linear equation could more accurately reflect the real growth of shrimp. Also, we found that different growth rate of shrimp absolutely conforms to the actual growth, and growth analysis selecting absolute growth value is more appropriate.