Cần đánh giá đúng về giống cá chim trắng nước ngọt - Nguyễn Hùng

PHO BIEN KHOA HOC VA CONG NGHE<br /> <br /> <br /> cAu OANH C\A euNO<br /> vi GidNG CA CHIM mANG Ni/CfC NGOT<br /> •23. NGUYEN HUNG<br /> Sd' 4, ngd 452, dUdng Le Dudn, Hd Ndi<br /> <br /> a Chim trang nrfdc ngpt t h a p den 2 mg/1 c i v i n sd'ng. cffa r a t cffng va sac n e n nhieu<br /> <br /> C ten khoa hpc la Clossoma<br /> brachypomum cd ngudn<br /> gdc tff sdng Amazon, Nam My.<br /> Chung tdi da theo ddi t h i y<br /> trong ao nudi ghep thieu oxy<br /> cac loai ca khac chet h e t<br /> ngrfdi l a m dd la loai ca dff,<br /> nhrfng thrfc c h a t lai h i e n<br /> l a n h , c h a m c h a p . Mdt so'<br /> Do cd mot sd rfu diem la an tap, nhrfng ca chim khdng chet. Cd ngrfdi nudi da de l i n chdng<br /> Idn nhanh, chiu ndng dp oxy the nudi loai ca nay d cac vrfc sang ao ca gid'ng Me, Trdi,<br /> t h a p n e n da drfdc n h a p vao cd pha nrfdc thai sinh hoat ven T r a m nhrfng k h d n g t h a y<br /> nudi d Trung Qud'c, T h i i Lan, thi t r i n , thi xa. chung a n ca con. Ca Chim<br /> Dai Loan tff n a m 1985. N a m t r a n g a n cac loai phu du sinh<br /> Ca Chim t r i n g cd td'c dp<br /> 1997, Cdng ty Vat trf Ca gid'ng vat, c i c loai h a t ngu cdc, cac<br /> Idn k h a n h a n h . Thdi ky trf ca<br /> Trung rfdng (Bd Thuy san) da loai rau cu qua, chdng a n ca<br /> mdi nd (ca bdt) rfdng len c i<br /> n h a p ca Chim t r i n g trf Trung l i bi, la mrfdp, x i c ddng v a t<br /> Qud'c ve nudi thff t a i Trai ca hrfdng sau 30 ngay d m a t dp<br /> chet, cac loai phe p h a m cua<br /> Sdng Ciu. Sau dd qua con 100 con/m^ c i dat chieu dai 3<br /> Id md... Khi nudi cdng nghiep<br /> drfdng tieu ngach, nhieu tinh - 3,5 cm, trpng Irfdng c i the<br /> vdi m a t dp cao chung a n thffc<br /> da n h a p ca bpt, ca hrfdng trung binh 0,8 gam/con. N a n g<br /> a n che b i e n la chinh. Trong<br /> Chim t r a n g ve nudi t h a y ca s u i t ca hrfdng d a t 500<br /> cac ao nudi g h e p cd h i e n<br /> p h a t trien td't, ca thit Chim kg/ha/30 ngay. Ty le sd'ng tff<br /> trfdng ca Chim t r a n g thieu a n<br /> t r a n g xuat hien ngay cang ca bdt len c i hrfdng dat 52%.<br /> n e n g a m v a y dudi ca Me,<br /> nhieu t r e n thi trrfdng ndi dia. Thdi ky tff ca hrfdng (3 - 4 cm)<br /> Trdi, T r a m , nhrfng n e u nudi<br /> Tuy n h i e n den nay chrfa cd rfdng t h a n h ca gid'ng, m a t dp<br /> ghep ca Chim t r a n g vdi ca Rd<br /> cdng trinh nghien crfu nao ve rfdng 15 con/m^, sau 45 ngay<br /> phi ddn tinh thi khdng cd t i n h<br /> ca Chim t r i n g nudi tai Viet ca d a t t r p n g Irfdng ca t h e<br /> t r a n g nay. Mffc tieu ton thffc<br /> Nam drfdc cdng bd', cung chrfa trung binh 25 gam/con. N a n g<br /> a n khi nudi b a n g thffc a n vien<br /> cd quy t r i n h ky t h u a t chinh s u i t rfdng gid'ng d a t 3<br /> la 1,8 - 2 kg thffc a n / 1 kg ca<br /> thrfc. Ngrfdi nudi ca cd nhieu tan/ha/45 ngay. Ty le sd'ng trf<br /> thit, trfdng drfdng vdi mffc tieu<br /> n h a n xet khac nhau ve gieng c i hrfdng len ca gid'ng d a t<br /> ton thffc a n cua ca Rd phi.<br /> ca nay. Cd ngrfdi e ngai vi day 80%. Dd'i vdi ca thit, neu nudi<br /> la gid'ng ca drf, a n nhieu, a n ghep 5 - 7% ca Chim t r a n g Ca Chim t r a n g k e m chiu<br /> tap, thien ve a n thrfc a n dpng trong c i c ao nudi chung vdi l a n h . C h u n g sd'ng va sinh<br /> vat nen canh t r a n h va gay hai cic loai ca k h i c , ty le sdng cua trrfdng td't khi n h i e t dp nrfdc<br /> cho cic loai ca khac. Cd ngrfdi ca Chim t r a n g la 100%, vdi 25 - 32°C nhrfng lai ngrfng a n<br /> ca ngdi sffc chd'ng chiu mdi td'c dp Idn la 1,2 - 1,5 kg sau 6 khi n h i e t dp nrfdc xud'ng drfdi<br /> trrfdng nrfdc ban va td'c dp Idn t h i n g nudi. Neu nudi rieng ca 15°C va chet nhieu k h i n h i e t<br /> n h a n h ma cho r a n g day la Chim t r i n g vdi m a t dp 2 dp nrfdc t h a p drfdi 10°C.<br /> gid'ng ca td't. Qua 5 vu theo ddi con/m^, cd gidng t h a 4 cm, cho<br /> Ca Chim t r i n g It b e n h t a t<br /> ndng dan nudi c i Chim t r a n g a n thrfc a n cdng nghiep, ty le<br /> t r e n dia b a n tinh Bac Ninh vao m u a h e , nhrfng vao m u a<br /> sd'ng d a t 70%, trpng Irfdng<br /> chdng tdi xin cd mdt sd' y kien ddng chung thrfdng n h i e m cac<br /> binh quan khi thu hoach la 0,8<br /> trao ddi nhrf sau: Idai n a m , t r u n g qua drfa,<br /> kg/con. N a n g s u i t ca thit dat<br /> t r u n g b a n h xe, s i n la... vdi<br /> 11 tan/ha/10 t h i n g . C i nudi 2<br /> Ca Chim t r a n g sd'ng va crfdng dp va ty le cam n h i e m<br /> n a m dat 3 - 4 kg, c i 3 tudi cd<br /> p h a t t r i e n td't d t a t ca cac cao, gay c h e t c i gid'ng h a n g<br /> con n a n g 5 kg.<br /> vung nrfdc trong t i n h B i c loat. Vi vay, mud'n giff ca qua<br /> Ninh. Dp pH cua nrfdc trf 5 - 8, Ca Chim t r i n g a n t a p va ddng phai chd'ng l a n h k e t hdp<br /> h a m Irfdng oxy trong nrfdc p h a m a n . Chung cd bd r a n g vdi phdng b e n h cho ca.<br /> <br /> THONG TIN KHOA HQC & CONG NGHE - SO 4/2010<br />