中国对虾(Penaeus chinensis)氮收支的初步研究

研究在20、25和30℃的正常海水(盐度为31)和5个盐度、水温为25℃条件下,分别测定了3个规格中国对虾摄食沙蚕和配合饲料的氮收支。研究结果表明,中国对虾的氮摄食率随温度的升高而增大,随体重的增加而减小;盐度为5时氮摄食率最小为11.78mg·g-1d-1,盐度为13时最大为13.88mg·g-1d-1.生长氮的比例随温度的升高显着减小;盐度为20的生长氮比例最大为26.52%,此时的特定生长率也最大为7.8%,盐度为5时的最小。中国对虾摄食沙蚕和配合饲料的平均氮收支模式分别为100I=27.63G+3.58E+1.66F+67.13U;100I=18.34G+4.10E+6.07F+71.49U.

Primary study on the nitrogen budget of Penaeus chinensis

The study on nitrogen budget of Penaeus chinensisI:(0.255±0.038)g; II:(3.522±0.207)g;Ⅱ:(11.132±0.71)g] is conducted at 3 temperature levels (20, 25, 30℃)and size(0.344±0.028)g] under 5 salinity levels (5, 13, 20, 28, 35) at 25℃.The results shown as follow:(1) the nitrogen consumption rate (1) increased with increasing of temperature and de-crewed with increasing of body weight. The largest consumption rate is 13.88 mg/(g·d) at salinity 13 and the minimum is 11.78 mg/(g·d) at salinity 5, (2) the proportion of ingested nitrogen allocated to growth(G)decreased significantly with increasing of temperature. The nitrogen average growth rates fed polychaete worm are 34.78%,29.59%,18.53 % and ones fed formulated diet. 26.06%,20.48 %,8.47% and (3) the nitrogen budget fed polychaete worm and fed formulated diet are:100I=27.636+ 3.58E+1.66E+67.13 U and 100I=18.346+4.10E+6.07E+71.49 U, respectively, where E is nitrogen of exuviate, F is feces and U is excretion.