中国对虾(Penaeus　chinensis)氮收支的初步研究

Primary study on the nitrogen budget of Penaeus chinensis

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著减小；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．

--The study on nitrogen budget of Penaeus chinensis [ I: (0. 255 ±0. 038)g; II: (3. 522± 0. 207)g; III: (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 (I ) increased with increasing of temperature and decreaed with increasing of they weight. The largest consumption rate is 13. 88 mg/(g' d) at salinity 13 and the minimum is 11. 78mg/(g.d) at salinity 5, (2) the proportion of ingested nitrogen allocated to growth(G ) decreased significantly with increasing oftemperature. 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. 63G +3. 58E + 1. 66F + 67. 13 U and 100I = 18. 34G + 4. 10E + 6. 07F + 71. 49 U, respeCtively, where E is nitrogen of exuviate, F isfeces and U is excretion.