| The Chinese Mitten Crab Eriocheir Sinensis is one of the most important economic aquatic products in our country. The sample was taken regularly at Jiu Duansha of Yangtze River and Tangkou of Jiangsu province from November in 2013 to December in 2014. The energy density of main components of Eriocheir Sinensis in the Crab season was studied by means of bio-physiography and bioenergetics. Furthermore, the differences of energy distribution strategy between breeding and wild crabs and in different seasons were discussed. The main results as followed:1,The energy density of gonad, hepatopancreas and muscle of wild Eriocheir sinensis at the stable stage(The gonad development completed) was studied in this paper. The results showed that hepatopancreas energy density(32.17±3.77 KJ/g) was higher than gonad(23.19±2.86KJ/g), muscle(24.41±1.41 KJ/g) and carapace energy density(14.42±1.76 KJ/g). The difference between gonad(23.19±2.86KJ/g) and muscle energy density(4.41±1.41 KJ/g) of females and males was significant(P < 0.01), but not between muscle and carapace energy density(P > 0.05), and no difference between female and male individual in total energy(P = 0.887) at the stable stage. The linear relation between volume and weight of Eriocheir sinensis was gained by using regression analysis, V=6.104+1.117WW(R2=0.973, n=98), and the linear relation between total energy and dry weight was also gained, E=18.12DW-28.05(R2=0.962,n=24). Energy allocation is different between genders that the females distribute higher energy(44%) to gonad and hepatopancreas than the males(23%).2.The change of energy density in different seasons and energy distribution strategy of farmed Eriocheir Sinensis in 2014 were studied and the energy prediction model was get in this paper. The results reflected that the energy density index in the autumn was higher than that in the summer(P<0.01), and energy densities of hepatopancreas(Summer:33.37 ±2.89,Autumn:39.48±2.30), gonad(Summer:0,Autumn:26.94 ±3.55), muscle( Summer:19.98 ±3.04,Autumn:22.78 ±0.98)and shell(Summer:12.64 ±1.17,Autumn:15.56 ±1.76)were decreased accordingly. The total energy of crab between summer(115.45 ±56.63 KJ)and autumn(556.88 ±116.54 KJ)had obvious difference(P<0.01). Additionally, the total energy of male crab had no obvious difference with the female in the summer(P>0.05) but the energy of male(635.226±113.46 KJ) was higher than the female(507.89±93.79 KJ) in the autumn(P<0.01). In the aspect of energy distribution strategy, autumn and summer were different. In the summer, The 30.6% and 33% of total energy of male and female crabs were stored in the hepatopancreas, respectively. In the autumn, 74.4% of total energy of male crab was stored in the body structure, 2.7% in the hepatopancreas and 2.9% in the gonad. However, 66.5% of total energy of female was stored in the shell, 19.8% in the hepatopancreas and 13.7% in the gonad. The linear growth relationship between dry weight and total energy was get(E = 17.855DW–1.970).3.Study on the different energy allocation strategy between farmed and wild Eriocheir Sinensis from the perspective of the bioenergetics. The results reflected that energy densities of hepatopancreas(35.15±3.61 KJ/g) and muscle(22.48±1.76KJ/g) were higher than that of gonadal(24.53±3.69 KJ/g) and shell, respectively. Furthermore, The total energy of breeding crabs(556.32±143.26 KJ)were higher than that of wild crab(457.44±185.20 KJ) and the total energy of male breeding Eriocheir sinensis(680.93±71.84 KJ) was higher than that of female(546.23±242.66KJ) in 2014. However, the total energy of male wild Eriocheir sinensis(408.11±136.50KJ) was much lower than female(546.23±242.66KJ). There was no significant difference(P<0.01) between breeding and wild Eriocheir sinensis, the energies of gonadal and hepatopancreas of male and female account for 35.3% and 19.5% of the total energy, respectively.(23.1% and 2.7% of gonadal, 12.2% and 16.8%of hepatopancreas). The size of wild Eriocheir sinensis in 2013 was smaller than that in 2014.4.Experimental research on the energy density and energy distribution of Eriocheir sinensis based on the bioenergetic,,then estimate DEB(dynamic energy budget) parameters for Eriocheir sinensis, i.e. shape coefficient Arrhenius temperature, growth, maintenance and reproduction etc. DEB model is highly concentrated of other biological model and the theory is very abstract. In our study, we estimate the related parameters which is the basic research for simulating the growth trend and population dynamic in the future. |
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