Primary Studies On The Physiology And Ecology Of Anguilla Marmorata And Its Ecological Breeding Technique

The article studies the physiology and ecology of Anguilla marmorata by a series of small water condition examinations, and the ecological breeding techniques of Anguilla marmorata based on experiments on the optimum temperature, optimum salinity and N absorption rate of Ceratoephyllum demersum L. The results are as follows:1. The experiment was conducted at different temperatures of26、28、30and32℃for40d, with Tubificidae as daily diet. The main result showed that different temperatures significantly (p<0.05) affected the growth of Anguilla marmorata. the optimum temperature of Anguilla marmorata is30℃; At this temperature, the specific growth rate (SGR), food conversion efficiency (FCE) and relative weight gain (RWG) of the aiguilles respectively achieved the maximum of1.67%· d-1、23.89and76.35%; By collecting the fecal of the aiguilles and detecting the protein content of Anguilla marmorata. We found that different temperatures significantly (p<0.05) affected the proteopepsis of the fecal. The group of30℃and32℃respectively had a lower protein content of4.76%and4.46%, and there’s no significant difference between the two groups (p>0.05).2.The test was set under the conditions of different salinities of0‰、10‰、20‰、30‰, and temperature of30℃, to determine the optimum salinity of the anguillas. The result indicated that Salinity had significant (p<0.05) effect on the growth of the anguillas, the optimum salinity of Anguilla marmorata is10%o; At this salinity, the anguillas reached the maximum of survival rate, specific growth rate, food conversion efficiency, and relative weight increase, respectively as100%,1.7%·d-1,57.97%and66.67%.2. A growth experiment was conducted under the conditions of temperature30℃, to determine the optimum feeding rate and the effects of different feeding rates on the growth performance of the black fry (Anguilla marmorat), size of3.67±0.3g. Five feeding rates from1.0%to3.0%(at0.5%increments) body weight per day were used in this test. An identical diet was given to the black fry for40d. The main result showed that the relative weight gain (RWG), specific growth rate (SGR), food conversion efficiency (FCE), net weight increase and survival rate (SR) of the black fry were significantly (p<0.05) affected by all feeding rates, and the optimum feeding rate of the black fry is2.0%; At this feeding rate, the FCE was47.39%, the SGR was1.08%/d, the RWG was52.49%,SR was100%。 4. By monitored the contents of ammonia and nitrite regularly in the eutrophic water withidentical weight of Ceratophyllum demersum L, respectively at the temperatures of26,28,30,32℃, we studied the N absorption rate of Ceratophyllum demersum L at the four differenttemperatures. The result illustrated that temperature have a significantly (p<0.05) effect on the Nabsorbing rate of Ceratophyllum demersum L; Group26℃had a significant (p<0.05) differenceover the rate of absorbing N, compared with the other groups.The article not only has important instructive value for the practice of ecological breedingof Anguilla marmorata, but also has some benefits on the further research in this field.