饵料密度、体重和盐度对黄边糙鸟蛤滤水率的影响

Effects of microalgae densities,weight and salinities on filtration rate of Trachycardium flavum

2011年11～12月,以扁藻(Platymonas subcordiformis)为饵料,在实验室条件下采用静水法测定了不同饵料密度、体重和盐度下黄边糙鸟蛤(Trachycardium flavum)的滤水率。结果表明:饵料密度、体重以及盐度对黄边糙鸟蛤滤水率均存在显著性影响。在实验饵料密度范围内,当饵料密度小于10×104cell·mL-1时,黄边糙鸟蛤的滤水率随着饵料浓度的增加而增大,饵料浓度与滤水率之间呈现正相关的幂函数关系;体重对滤水率的影响呈幂函数关系,个体滤水率随着体重的增加而增大;在一定盐度范围内,滤水率随着盐度的升高而增大,在盐度为32.7时滤水率达到最大值0.249 L·(g·h)-1,随后随着盐度的升高滤水率呈下降趋势。

At temperature 21± 0. 5 ℃, with Platymonas subcordiformis as food, the filtration rates of Trachycardiumflavum were determined under different algae concentrations （4.0 x 104cell . mL-1, 6.0 X 10^4cell ＂mL-1 ,8.0 x 10^4cell .mL-1 ,10.0 x 10^4cell .mL-1, 12 x10^4cell .mL-1 ） when salinity was 33 , different salinities （24,27,30,33,36,39） when algae concentration was 10.0 x 10^4 ind ~ mL- 1 and different dry weights, including （ 1.22 ±0.06） g, （ 1.53 ±0.09） g and （2.44 ± 0.57 ） g, when salinity was 33 and algae concentration was 10.0 x 10^4cell. mL- 1 by stagnant water method from November to December in 2011. The results indicated that the algae concentrations, dry weight and salinity had distinct effects on the filtration rate of T. flavurn. Within a certain range of algae concentrations, the filtration rate of T. flavurn increased with the increasing algae concentration, which can be described by a positive functional relation. The filtration rate of T. flavum was related to dry weight by a power function relation, and the filtration rate of T. flavumincreased with the increasing salinity but decreased if the salinity was over 32.7.