Effects Of Cultural Water Environment On Survival And Growth Of Juvenile And Adult Eriocheir Sinesis

The primary research of this paper concentraes mainly on the effects of cultural water environment on survival and growth of Eriocheir sinesis in “juvenile crab-adult crab”breeding phase.Taking juvenile and adult crab of Eriocheir sinesis as the research object.First of all,calculating the morphlolgical attributes and quality parameters of both juvenile crab and adult crab.Second,under the condition of the laboratory simulation,the effect of temperature stress on the survival of juvenile crab.Third,through setting to explor different farming grass coverage in the pondinfluence on the growth of adult crabs.Results are as follow:(a)During the “juvenile crab-adult crab” breeding phase,the males individual growth rate than females.Hepatosomatic water content,muscle water content and other parts water content(the other parts refer to dissection after removing the muscle,hepatosomatic,gonad)of juvenile crabs were significantly higher than adult crabs(P<0.01),The hepatosomatic index and muscle index of adult crabs were extremely different to juvenile crabs(P < 0.01).Seting up weight and carapace length,apace width and carapace height regression equation,juvenile crabs decision coefficient was higher than adult crabs.(b)20 ~ 25 ℃ could be suitable for juvenile crabs growth and development of the optimum temperature.When temperature conditions more than 25 ℃,the crabs survival rate decreases with the increase of temperature.The juvenile crabs are sensitive to temperature and they produce corresponding behavioral responses to high temperature.(c)The pond of higher grass coverage(over 70%)compared with lower grass coverage,adult crab do better growth and size,the quality also have differences;larger surface area(over 20 mu)compared with smaller surface area of the pond,the adult crabs in the larger surface area grow faster and have bigger size,muscle index also become higher.The study provided a guidance for “juvenile crab-adult crab” breeding phase management,and provide a scientific basis forquality evaluation,yield estimation and ecological culture.