Nghiên cứu thành công nuôi cá điêu hồng trong hồ chứa nước

B<br /> inh Dinh ed 154 hd chOa Idn mat 1) va 04 mat ben (ky hieu mat Vi trl dat long<br /> nhd vdi tren 5.000 ha dien 2,3,4,5) mat de hd phai tren gpi la - Khu vQc ha IQu hd chOa, eae<br /> tieh mat node. Cd 1.700 ha mieng Idng (ky hieu mat 6). y i u td mdi trudng:<br /> sQ dgng nudi ea, theo hinh thQe<br /> - Kfch thude idng IQdi nudi + p H : 6,7 - 7,3;<br /> nudi ea q u i n g canh, nang s u i t<br /> thOdng pham: 4m x 5m x 2,5 m,<br /> thap. De khai thac h i t t i i m nang, + Oxy hda tan: > 5 mg/lit;<br /> i'^r,^ lieh ngap node 40 m^<br /> nudi ea Idng nang s u i t eao tren + NH3: < 0,1 mg/lit;<br /> cac hd chOa Idn cua tinh, d i tai - Lodi lam Idng la loai eOde sdi<br /> PE 380 D1/8 det khdng giit de dn - Chpn ndi thdng thoang, khdng<br /> nghien cOu, xay dQng quy trinh ky nen nudi tai eae d i e m eua eo<br /> thuat Qdng nudi thQdng pham ea djnh mae lodi (2a)= 15 - 18 mm,<br /> ed e h i i u dai, rpng b i n g khung d ngaeh. Dp sau mOe nude tai d i i m<br /> dieu hdng trong Idng nang s u i t dat Idng tren hd chQa > 5 m trong<br /> nudi, e h i i u eao 2,5 - 3m. Cd dinh<br /> cao tren hd chOa node tinh Binh sudt thdi gian vg nudi.<br /> Idng b i n g day g i i n g va neo.<br /> Dinh. ThQ nghiem md hinh nudi<br /> thQdng pham ea dieu hdng trong (Xem tie'p trang 27)<br /> Idng nang s u i t eao tren hd chQa<br /> Dinh Binh (Hd loai II) va Hpi Sdn<br /> (Hd loai III), trong thdi gian tO Nghien cttu thanh cong<br /> thang 4.2009 - 6.2010<br /> KET QUA NGHIEN CLfU nuoi cd dieu hong trong<br /> Thie't ke khung long be ndi:<br /> * B i n g dng thep:<br /> - Mdi c u m be ed kfch thode<br /> ho chvCa nitdc<br /> khung Idng 24m x 12m, gdm 2 day TRAN QUANG NHLTT & CTV<br /> mdi day 6 d, kich thOde mdi d la Trung tam Khuye'n ndng Khuye'n ngU Binh Dinh<br /> 4m X 5m.<br /> - Cgm be ed 10 d Idng, 02 d sQ<br /> dung lam nha b i o ve, sQ dgng<br /> k h o i n g 50 - 60 phuy sat 200 lit<br /> lam phao.<br /> - Cae dng tiep thep dOdc lien<br /> k i t bang tiep ndi nhau.<br /> * B i n g vat lieu tre cay:<br /> - Mdi c g m be ed kich thgde<br /> khung Idng 14m x 12m, gdm 2 day<br /> moi day 3 d, kich thode mdi d la<br /> 4m X 5m.<br /> - Cgm be cd 6 d Idng, sQ dgng<br /> khoang 1 7 - 1 8 phuy s i t 200 Ift<br /> lam phao.<br /> - Cac cay tre dope lien k i t b i n g<br /> day thep.<br /> Thiet kelong ludi uang gidng<br /> - Ldng lam b i n g IQdi, hinh hop Md hinh Idng be nudi ca tren hd chffa nffdc tJnh Binh Djnh<br /> lap phQPng hoae hinh ehO nhat,<br /> cd 01 mat day va 04 mat ben, mat<br /> de hd gpi la mieng Idng.<br /> - Kich thode Idng IQdi: 3 m x<br /> 3m X 2,5 m, dung tieh ngap nOdc<br /> 15 m^<br /> - Lodi lam Idng la logi code<br /> sdi PE 380 D1/8 det khdng gut<br /> de m i t lodi dn djnh m l c lodi (2a)<br /> = 1- 1,5mm. C d djnh Idng b i n g Ca dieu hdng<br /> day g i i n g va neo. phat trien nhanh<br /> Thie't kelong lUdi nudi thuang tai hd My Thuan<br /> pham (Phu Cat) do mdt<br /> tu nhan dau tff.<br /> - Ldng lam bang IQdi, hinh hop<br /> lap phoong, ed 01 mat day (ky hieu A. TL<br /> <br /> <br /> KHOn HOC<br /> &C6NGNGIHE<br />  nudi thOdng pham 2 vg trong nam.<br /> NGHIEN CL/U THANH CONG NUOI CA... Cd t h i sQ dgng nguyen lieu sin<br /> (Tiep theo trang 25) ed la tre, gd hay sit d i lam khung<br /> Idng be phu hop vdi k h i nang kinh<br /> -Tdc dp ddng chay 0,1 -1 m/giay. Sau thdi gian Odng tO 28-30 t i cua ndng hp hoae doanh nghiep.<br /> - Vi tri dgt Idng each bd it nha't ngay cd t h i tien hanh thu hoach<br /> Ngudn ea gidng nudi thOPng<br /> 15 - 20 m. ca chuyen sang chu ky nudi thOdng<br /> pham, tdt nhlt lay tO ngudn oong<br /> pham.<br /> Ky thuat Udng gid'ng cd dieu nudi tgi chd. Nho vay ty le sdng<br /> hong trong Idng Ky thuat nudi thUdng pham cao, gia thanh thap, sOc khde<br /> cd dieu hong trong Idng ca td't.<br /> Mua vg Qdng tO thang 2 d i n<br /> thang 8 hang nam. Mua vy;Cd the nudi2 vg/nam. Mat dp ca Odng 400 con/m^,<br /> Vg 1(Vg chinh) tO thang 3 - 7; Vg ed gidng tha 350 - 400 eon/kg, ed<br /> Kich cd ca gidng: 350 - 400<br /> 2 (Vg phg) tO thang 8 - 12. gidng thu hoach 20-25 gam/eon.<br /> con/kg<br /> Ca gidng: Cd 20 - 25 gam/con Mat dp nudi thOdng pham 100 -<br /> Khi tha ca, ngam bao ehOa ea 105 eon/m^ ed gidng tha 20 - 25<br /> vao Idng nudi trong thdi gian 15 - Mat dp :100 -105 con/ m^ (Ham<br /> Iffdng oxy hda tan > 5 mg/l) gam/eon, ed ea thoong pham thu<br /> 20 phut. Sau dd thao mieng bao, hoach 500 - 600 gam/con.<br /> cho node tO tQ vao mieng bao va ThQe an: Vien, hat mjn, IQdng<br /> tiin hanh tha ea. dam 18 - 30%. ThQc an sQ dgng Qdng nudi<br /> thOdng pham ca dieu hdng trong<br /> Thi ca gidng vao luc sang sdm Ngay cho an 2-3 lan vao sang Idng la thQe an vien chit IQdng, dp<br /> hoac chiiu mat. sdm va chiiu tdi. dam giai doan Qdng 32 - 35%, dp<br /> Mat dp: 400 con/ m^ Ty le sdng dan ca dgt khoang dgm giai doan nudi thOdng pham<br /> ThQe an vien hat mjn, ham 80%. 18 - 30%; He sd thQc an giai doan<br /> lupng dgm cao 35%, kfch ed vien Hang ngay kiim tra cac y i u td Qdng 1,39; He sd thOe an nudi<br /> thQc an 1 - 1,5 mm. mdi trodng node Idng nudi d i kjp thUdng pham tO 1,8 - 1,82.<br /> Sinh trudng va tdc dg sinh thdi tae dpng ky thuat nudi diiu Thdi gian Qdng gidng tO 28 - 30<br /> trudng chinh mdi trQdng theo hOdng thich ngay, nang suit 7,1 kg/m^, ty le<br /> hop eho ddi sdng ca nudi trong Idng. sdng > 70%; Thdi gian nudi thQdng<br /> Tdc dp sinh trOdng trung binh<br /> ngay ciia ca UPng eao nhlt d giai Sau thdi gian nudi 140 - 150 pham to 140 -150 ngay, nang sua't<br /> doan cudi chu ky, tuan tudi thQ 3 ngay cd t h i tiin hanh thu hoach. 42 kg/m^ ty le sdng 80%.<br /> dat 0,84 gam/ca the/ngay va tuan KET LUAN Md hinh nudi ea dieu hdng trong<br /> tuoi thQ 4 dgt 1,31 gam/ca the/ngay. Mpt sd hd chQa Idn dam b i o Idng tren hd ehOa dat hieu qui kinh<br /> Ty le sdng dan ca nudi giam diiu kien nudi ca Idng, vi tri dgt t i cao, qui md phu hdp mOc ndng<br /> dan theo thdi gian vg gdng, tuan Idng nudi thich hpp tren eae hd hd la > 2 Idng, qui md phu hdp mOc<br /> Qdng thO I va thQ II ty le chet eua ehOa Idn tinh Binh Djnh la khu vQc dau to doanh nghiep la > 10 Idng;<br /> ca cao do ea phii thich nghi vdi hg lOu g i n dap, dp sau dn djnh > Ty suit ldi nhuan tO 20 - 24% •<br /> dieu kien mdi trodng sdng mdi. 5 met trong sudt vg nudi. Cd the T.Q.N<br /> <br /> • vao mdi trodng nhan tgo, y i u td ca gidng khdng cd sQ khae biet rd cao nhlt la 2.89%/thang d nghiem<br /> djch benh...Van d i nay cae node rang v i mat thdng ke. thOc 150 con/m^, ti suit ldi nhuan<br /> cd cdng nghe nudi ca chinh phat Ty le sdng: Mat dp OPng ca thap nha't la 1.53%/thang d nghiem<br /> trien d i u rat quan tam. chinh cang eao thi ti le sdng cang thQe 250 ccn/m^ Nhin ehung c l 3<br /> Ket qua thi/e nghigm glal doan giim. SQhao hgt cua ea chinh diin nghiem thOc Qdng deu ed hieu q u i<br /> tdcd huang den ea gidng: ra d i u dan va lien tge trong sud't kinh t i .<br /> cae yeu td phu hpp: MQc nhiet thdi gian Qdng. So vdi nghi Odng gidng eae<br /> dp trung binh va nhiet dp cao nhat; Ddnh gia hieu qud kinh te - ddi topng khae thi Qpng ea ehinh<br /> Dp pH to 6.5 d i n 7.5; 6-xy hda xa hdi cua md hinh thU nghi#m bdng cd thdi gian tOdng ddi dai,<br /> tan to 5.0 mg/l d i n 6.8 mg/l; mdi va khd nang nhan rpng trong dan thdi gian thu hdi vdn cham. Day la<br /> trodng la node ngpt; khdng cd nhOde diim eua nghe Odng gidng<br /> Hieu qud kinh te: Giai dean<br /> NH3-N trong mdi trOdng nudi. ea ehinh bdng.<br /> to ea bpt d i n ea hoong cho thiy d<br /> Tang trUdng: Tdc dp tang mat dp Qdng 2.500 con/m^, k i t Hieu qud xa hdi va khd nang<br /> trodng cua ea chinh bdng khi Qdng q u i hgch toan da bj Id do ti le sdng nhan rpng trong dan:<br /> d mat dp tO 150 con/m^ d i n 250 thap nho da trinh bay d tren. 6 hai Sau 2 nam trien khai thQe hien,<br /> con/m^ khoing 0.0265 - 0.0269 nghiem thOc Qdng vdi mat dp 1.500 d i tai da tap huln eho ddn vdi ndi<br /> g/con/ngay. Sau thdi gian Qdng con/m^ va 2.000 con/m^ d i u cd lai dung: PhOdng phap thu vdt ea<br /> 285 ngay dgt trung binh tO 10.12 vdi ti suit Ipi nhuan tO 2.56%/thang ehinh bdt tgi eae dap dang; Tach<br /> den 10.14g/con. SQ tang trOdng d i n 2.64%/thang. Ipc, lOu giQ va van ehuyen ca ehinh<br /> CLia ca chinh bdng qua eae thang Giai dogn tO ca hQdng d i n ca bpt; Ky thuat OPng nudi ea ehinh<br /> Udng d giai dogn tQ ea hOdng d i n gidng cho thay ti suit Ipi nhuan gidng va thOPng pham • PTV<br />