The invention provides a low-salt
overwintering and breeding method of
portunus trituberculatus. The method comprises the following steps that: manual seed selection parent crabs without any diseases are selected; low-salt
seawater is used for carrying out parent crab
overwintering and
juvenile crab breeding, so as to avoid causing diseases and vertical
disease transmission in an
overwintering and breeding period; during the overwintering period, underground bittern and
fresh water are used for mixing and preparing low-salt
seawater for the overwintering, so as to
cut off a transmission path of the diseases; baits are reasonably matched, and have complete
nutrition, so as to accelerate the healthy development of parent crab embryos; the
seawater with the 2 per mill salt degree is adopted to carry out
juvenile crab breeding to simulate a
natural environment which is suitable for
egg laying of the parent crabs and
juvenile crab growth, so that the yield and the quality of the juvenile crabs are improved; and the salt degree and the temperature of the sweater in a breeding
pool are adjusted to be same as those of an outdoor cultivating
pool at the time of 24 hours before the juvenile crabs are output, so as to avoid causing stress reaction due to that the environment is greatly changed. According to the low-salt overwintering and breeding method of the
portunus trituberculatus, the overwintering
survival rate and the juvenile crab yield of the
portunus trituberculatus are improved and the outdoor cultivation
survival rate is greatly improved; and the low-salt overwintering and breeding method of the portunus trituberculatus can be widely applied to sea-near sea areas and
river mouth regions and has the obvious
economic benefits.