奇异海蟑螂Ligia exotica幼体的生长特征研究

Study on the growth performance of juveniles of isopod Ligia exotica

海蟑螂在中国沿海从南到北均有分布,为半陆生甲壳类生物,常栖息于近海岩礁的石缝中。海蟑螂野生资源量巨大,饲用与药用效果明显,且适应能力强,有很高的科研和实用价值。实验评估了奇异海蟑螂(Ligia exotica)幼体从出生到60日龄的生长表现,发现在45日龄后,个体体重增加开始明显加快。60日实验期间幼体增重率为7746.51%,特定生长率为7.27%,高于其他甲壳类生物。幼体体长和体宽呈现相近的增长趋势,且体长的增长快于体宽。回归分析显示海蟑螂幼体体重与体长、体宽均具有较好的正相关性,决定系数R2分别为0.90和0.87,故可以通过体长和体宽估算其体重。实验首次实现了海蟑螂幼体的全人工培育,为其成为经济虾蟹类研究的模式动物打下了基础。且实验证实海蟑螂幼体生长速度非常快,有利于人们对其种群的开发利用。

Isopod Ligia exotica are distributed from the south to the north coast of China,which exhibit a mixture of terrestrial and marine characteristics.They usually live in the crevices of offshore rocks.The wild resource of Ligia is huge and they have positive effects on feeding and medicine.Ligia are adaptable to the environment and have high scientific research and practical utilization value.The growth performance of Ligia juveniles from birth to 60 days was evaluated in this experiment.After 45 days of age,the weight gain of individuals accelerates significantly.During the experiment,the weight gain rate of juveniles was 7746.51%,and the specific growth rate was 7.27%,which was higher than that of other crustaceans.The body length and width of juveniles showed a similar growth trend and the increase of body length was faster than that of body width.Regression analysis showed that there was positive correlation between body weight to body length,body weight to body width respectively of Ligia juveniles and coefficient of determination R2 were 0.90 and 0.87 respectively,which indicated the regression equation could be used to estimate their body weight accurately.For the first time in the research that the artificial culture of Ligia juveniles was achieved,which laid the foundation of Ligia to be the model animals for the economic crustacean research.It has been proved that the growth rate of Ligia juveniles is very fast,which is beneficial to the utilization of its population.