The mature parent fish of Trichiurus lepturus was caught with bottom trawl on board R/V "Beidou" in the Haizhou Bay, Yellow Sea. The running eggs were artificially fertilized. The fertilized eggs began to divide in 1h30min, to be 16cell stage in 2h55min, late cleavage stage in 4h25min, blastula stage in 10h30min, closure of the blastopore in 25h45min, hatching in 78h45min after insemination, and the process of embryonic development was about 79h at 20.6-22.6℃.
The specimens for biological study were collected from the spawning and feeding ground of Ammodytes personatus and the A. personatus fishing condition data for the fishery management were collected in 1999-2003. The compositions of food organisms of A. personatus in the coast of southern Shandong peninsula include the Copepoda,Chaetognatha,Amphipoda,Decapoda and Euphausicea. From summer season to the spawning stage, A. personatus distributed in the northern Yellow Sea do not take food. The absolute majority of A. personatus mature during their first year of life and this fish spawns once a year.The main spawning season is from the end of October to November.In the earlier stage,the temperature for the spawners is about 11.8°C and salinity is about 31.686. The individual absolute fecundity （eggs） ranges from 0.45×104 to 5.10×104 （mean （1.79）×104）. The relation equation between absolute fecundity and net weight（g） is E=（1867.7129610）W1.209953873. The relation equation between absolute fecundity and body length（mm） is E=0.000175549 L3.70261414. The catch of A. personatus consists of 3 year classes, from age groupⅠto age group Ⅲ,excluding the age group 0. The otolith was used for age determination. To cite 2002 as example,the length-weight relationship is calculated to be W=0.001906 L3.17039. The faunal characteristics of fishes of the Yellow Sea is quite different in composition from the other parts of the China Sea.Almost 90% of the Yellow Sea fish belong to warm-temperate and warm-water fishes, only a few species belong to cold-temperate species. As a cold-temperate species, A. personatus is valuable legacy of ecosystem evolution of the Yellow Sea. In view of the above, sustainable utilization of this fish species is more important.
