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An investigation of life history and feeding habits of Branchiostoma belcheri tsingtauense outside of Luanhe Estuary
Pages: 30-34
Year: Issue:  11
Journal: Hebei Fisheries

Keyword:  Branchiostoma belcheri tsingtauenslife historyagegrow thdeathfeeding habit;
Abstract: The life history of Branchiostoma belcheri tsingtauens ,was studied on May and August from 2007 to 2008 .The results are as follows .(1)Its population consisted of four age groups of animals with lengths of 10~14 ,20~28 ,36~38 and 44~46 mm ,the longest record is 47 .5 mm .(2)The average grow th rate and length of 1~2 years old are same ,and 3~year -old group is fasted and 4-year-old group is lowest .After hatching with 2~3 months ,growth rate is near to 2~2 .5 mm/月.(3) Body length and weight was a significantly logarithmic relationship ,belong to Uniform growth type .(4) Amphioxus was feed on diatoms which particle size is below 1 mm the ,Coscinodiscus and Chaetoceros is the main food organism .
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