Ba hinh thUe nudi ech thUdng xung quanh ao. Muc nude ao khdng hai va lua ech vUdt dan. Ao cd<br />
pham mang lai hieu qua kinh te: che 20 - 30cm, cd dng thoat nudc. nhUdc diem d l bj rd ri do ech dao<br />
Nuoi trong ao da't: Ao dien tich Dao mUOng trong ao rpng 1,5m, hang de tru an.<br />
khoang 50 - 200m2. Cd the trai bat sau 0,3m. Han che anh sang true Nuoi trong giai, dang quang<br />
nylon ndi ao khdng giU nude. Rao tiep. Tao gia the cho ech len can va long be: Thfeh hop vung ed ao,<br />
chung quanh ao de tranh ech nhay d (be tre, gd, tam nylon, beo tay...) hd Idn cd the vUa nudi ech ke't hop<br />
ra. Dang IUdi bao ve phia tren va lam ndi cU tru eho ech, dien tich vdi nudi ea (cae loai ca an tap nhU<br />
gia the 5 0 % dien tfch tre, rd phi, ca Idc ...), giam chi phi<br />
ao nudi (khi ao khdng thUe an cho ea.<br />
CO bd de ech len d).<br />
CAC HiNH THl/C Ech phai nudi ndi ed<br />
nude ngpt hoan toan,<br />
Ldng nudi dUdc thiet ke hinh<br />
ehU nhat, cd kich thudc 8 - 50m^<br />
(2x4, 4x8, 5x1 Om). Chieu cao 1 -<br />
khdng b j d n h i l m chat<br />
NU6(ECH hUu ed va nUde thai<br />
cdng nghiep. Cd the sCf<br />
1,2m. Ldng lam bang IUdi cUdc ni-<br />
ldng mau xanh hoac den phfa tren<br />
ed cilfa eho ech an. Chieu eao 1-<br />
dung nude gieng, nude 1,5 m. Nen dan thanh tUng Idng<br />
HIEU QU^ sdng hay nUdc ao. Cai<br />
tao ao: Sen vet bun<br />
day, bdn vdi bung CaO<br />
rieng le n h I m tien cham sdc, kiem<br />
tra. Tam dUdi cung nen dung loai<br />
ludi thUa hdn de khi ech an khdng<br />
NGUYIN NGOCTU tu 7-15kg/100m2 de het, thUe an se rdi xudng cho ca<br />
nang pH da't, diet tap an. Ldng nudi dUde dat tren ao,<br />
va m a m b e n h . Phdi mUdng..., Mdi Idng dUde bd tri 6<br />
nen day ao 3-7 ngay. cpc de giU Idng. Tao gia the cho<br />
Dieu kien mdi trUdng ech len can cUtru bang each d day<br />
nudc thich hdp de ech Idng trai mdt Idp xdp, tren Idp xdp<br />
phat trien: pH 6,5 - trai mdt Idp phen tre va phen nUa<br />
8,5, Alkalinity 100 - de giU dp am va lam san an cho<br />
150 m g / l . A m m o n i a ech. Tdng dien tfch gia the chie'm<br />
(NH3)