Hemifusus tuba Gmelin populations took little food during their breeding period,and their weight declined.This was due to two main reasons:on the one hand,they mated and spawned,and did not want to take food;on the other hand,they consumed massive material and energy of the body during the period.But the weight of a few male populations did not change;some even increased.After the later breeding period,some H.tuba individuals died,and this was related with the overuse of the energy of body.So they would have been given enough food,and put back to the sea to increase their survival rate.The upgrowth of eggs in egg capsule took 45-60 days,and then the juvenile individuals appeared.As the skill of breeding juvenile individuals was not so mature,massive ones died in short time after they came out of the egg capsules due to the environmental changes.So we should learn from the lesson,and deal with the problem during the breeding quickly to keep the higher survival rate.Only in this way can we breed massive juvenile individuals in the future.