{"id":2112,"date":"2022-03-18T16:10:19","date_gmt":"2022-03-18T16:10:19","guid":{"rendered":"https:\/\/www.greenfeed.com.vn\/thuy-san\/?p=2112"},"modified":"2022-03-21T03:57:39","modified_gmt":"2022-03-21T03:57:39","slug":"quan-ly-ao-nuoi-va-phong-benh-ca-trong-giai-doan-giao-mua-nang-va-mua","status":"publish","type":"post","link":"https:\/\/www.greenfeed.com.vn\/thuy-san\/quan-ly-ao-nuoi-va-phong-benh-ca-trong-giai-doan-giao-mua-nang-va-mua\/","title":{"rendered":"Qu\u1ea3n l\u00fd ao nu\u00f4i v\u00e0 ph\u00f2ng b\u1ec7nh c\u00e1 trong giai \u0111o\u1ea1n giao m\u00f9a n\u1eafng v\u00e0 m\u01b0a"},"content":{"rendered":"

Sau nh\u1eefng \u0111\u1ee3t n\u1eafng n\u00f3ng gay g\u1eaft k\u00e9o d\u00e0i cu\u1ed1i m\u00f9a kh\u00f4 v\u00e0 th\u1ec9nh tho\u1ea3ng xu\u1ea5t hi\u1ec7n v\u00e0i c\u01a1n m\u01b0a nh\u1ecf k\u00e8m theo gi\u00f4ng, th\u1eddi ti\u1ebft l\u00fac giao m\u00f9a \u0111\u1ed9t ng\u1ed9t thay \u0111\u1ed5i, xen k\u1ebd gi\u1eefa n\u1eafng n\u00f3ng, m\u01b0a \u1ea9m v\u00e0 b\u1ea7u tr\u1eddi nhi\u1ec1u m\u00e2y khi\u1ebfn c\u00e1 nu\u00f4i m\u1ec7t m\u1ecfi, s\u1ee9c \u0111\u1ec1 kh\u00e1ng suy gi\u1ea3m. C\u00e0ng n\u1eafng n\u00f3ng, k\u1ebft h\u1ee3p m\u01b0a n\u1eafng th\u1ea5t th\u01b0\u1eddng c\u00f9ng v\u1edbi v\u1ec7 sinh b\u00ean trong v\u00e0 b\u00ean ngo\u00e0i ao, b\u00e8 nu\u00f4i c\u00e1 kh\u00f4ng t\u1ed1t s\u1ebd l\u00e0 \u0111i\u1ec1u ki\u1ec7n cho m\u1ea7m b\u1ec7nh virus, vi khu\u1ea9n v\u00e0 k\u00fd sinh tr\u00f9ng sinh s\u00f4i v\u00e0 ph\u00e1t tri\u1ec3n.<\/p>\n

Nhi\u1ec7t \u0111\u1ed9 cao nh\u1ea5t ph\u1ed5 bi\u1ebfn 32 – 36 \u0111\u1ed9 C, s\u1ed1 gi\u1edd n\u1eafng k\u00e9o d\u00e0i t\u1eeb 9-10 gi\u1edd m\u1ed7i ng\u00e0y,\u00a0\u0111\u1ed9 \u1ea9m\u00a0duy tr\u00ec d\u01b0\u1edbi 60%, l\u00e0 \u0111i\u1ec1u ki\u1ec7n r\u1ea5t b\u1ea5t l\u1ee3i cho c\u00e1 trong ao, b\u00e8. N\u00f3ng kh\u00f4 li\u00ean t\u1ee5c khi\u1ebfn n\u01b0\u1edbc ao b\u1ecb n\u00f3ng, c\u00f9ng v\u1edbi qu\u00e1 tr\u00ecnh b\u1ed1c h\u01a1i nhi\u1ec1u s\u1ebd l\u00e0m ch\u1ea5t l\u01b0\u1ee3ng n\u01b0\u1edbc bi\u1ebfn \u0111\u1ed5i theo chi\u1ec1u h\u01b0\u1edbng x\u1ea5u r\u1ea5t nhanh, c\u00e1 d\u1ec5 b\u1ecb m\u1eafc c\u00e1c b\u1ec7nh nh\u01b0 xu\u1ea5t huy\u1ebft do Aeromonas<\/em> sp., th\u1ed1i mang, m\u00f2n v\u00e2y do Flavobacterium<\/em> sp., s\u00e1n l\u00e1 mang, tr\u00f9ng b\u00e1nh xe d\u1eabn \u0111\u1ebfn ch\u1eadm l\u1edbn ho\u1eb7c b\u1ecb hao h\u1ee5t nhi\u1ec1u.<\/p>\n

\"\"<\/p>\n

1. R\u1ee7i ro do nhi\u1ec7t \u0111\u1ed9 n\u01b0\u1edbc cao<\/strong><\/p>\n

Trong nh\u1eefng th\u00e1ng m\u00f9a kh\u00f4, khi ng\u00e0y d\u00e0i v\u00e0 b\u1ee9c x\u1ea1 nhi\u1ec7t cao tr\u1ef1c ti\u1ebfp t\u1eeb m\u1eb7t tr\u1eddi l\u00e0 l\u1edbn nh\u1ea5t, n\u01b0\u1edbc trong ao tr\u1edf n\u00ean ph\u00e2n t\u1ea7ng th\u00e0nh c\u00e1c l\u1edbp n\u01b0\u1edbc c\u00f3 nhi\u1ec7t \u0111\u1ed9 ch\u00eanh l\u1ec7ch nhau trong ao; v\u1edbi nhi\u1ec7t \u0111\u1ed9 cao nh\u1ea5t l\u00e0 32 – 33 \u0111\u1ed9 C \u1edf l\u1edbp n\u01b0\u1edbc b\u1ec1 m\u1eb7t c\u1ee7a ao, l\u1edbp n\u01b0\u1edbc \u1edf gi\u1eefa ao c\u00f3 th\u1ec3 l\u00e0 28 – 30 \u0111\u1ed9 C v\u00e0 l\u1edbp n\u01b0\u1edbc \u1edf t\u1ea7ng s\u00e2u nh\u1ea5t nhi\u1ec7t \u0111\u1ed9 xu\u1ed1ng \u0111\u1ebfn 24 – 26 \u0111\u1ed9 C.<\/p>\n

T\u00e1c \u0111\u1ed9ng c\u01a1 b\u1ea3n c\u1ee7a qu\u00e1 tr\u00ecnh t\u00e1ch nhi\u1ec7t c\u1ee7a c\u00e1c t\u1ea7ng n\u01b0\u1edbc l\u00e0 l\u00e0m gi\u1ea3m h\u00e0m l\u01b0\u1ee3ng oxy h\u00f2a tan t\u1ed5ng th\u1ec3 trong ao; l\u00e0m cho ao tr\u1edf th\u00e0nh m\u00f4i tr\u01b0\u1eddng s\u1ed1ng b\u1ea5t l\u1ee3i c\u1ee7a c\u00e1. H\u01a1n n\u1eefa, nhi\u1ec7t \u0111\u1ed9 n\u01b0\u1edbc cao th\u00fac \u0111\u1ea9y s\u1ef1 ph\u00e2n h\u1ee7y c\u1ee7a c\u00e1c ch\u1ea5t h\u1eefu c\u01a1 c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn s\u1ef1 t\u00edch t\u1ee5 kh\u00ed \u0111\u1ed9c c\u00f3 h\u1ea1i. S\u1ef1 k\u1ebft h\u1ee3p \u1ea3nh h\u01b0\u1edfng c\u1ee7a gi\u1ea3m oxy h\u00f2a tan v\u00e0 t\u00edch t\u1ee5 kh\u00ed \u0111\u1ed9c NH3<\/sub> v\u00e0 H2<\/sub>S trong n\u01b0\u1edbc s\u1ebd l\u00e0m gi\u1ea3m s\u1ef1 th\u00e8m \u0103n c\u1ee7a c\u00e1, g\u00e2y c\u0103ng th\u1eb3ng, v\u00e0 cu\u1ed1i c\u00f9ng d\u1eabn \u0111\u1ebfn c\u00e1 b\u1ec7nh, ch\u1ebft.<\/p>\n

2. R\u1ee7i ro do kh\u00f4 h\u1ea1n<\/strong><\/p>\n

Trong m\u00f9a h\u1ea1n, n\u00f4ng d\u00e2n th\u01b0\u1eddng g\u1eb7p kh\u00f3 kh\u0103n trong vi\u1ec7c l\u00e0m th\u1ebf n\u00e0o \u0111\u1ec3 b\u1ed5 sung n\u01b0\u1edbc cho ao c\u1ee7a m\u00ecnh. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t \u0111\u00fang \u0111\u1ed1i v\u1edbi nh\u1eefng ng\u01b0\u1eddi c\u00f3 ao ngo\u00e0i khu v\u1ef1c k\u00eanh, m\u01b0\u01a1ng ho\u1eb7c xa c\u00e1c nh\u00e1nh s\u00f4ng l\u1edbn. C\u00e1c ao nu\u00f4i c\u00e1 c\u00f3 di\u1ec7n t\u00edch l\u1edbn d\u1ec5 g\u1eb7p r\u1ee7i ro h\u01a1n v\u00ec c\u00f3 \u00edt n\u01b0\u1edbc b\u1ed5 sung v\u00e0o ao h\u01a1n. Nhi\u1ec7t \u0111\u1ed9 kh\u00f4ng kh\u00ed cao s\u1ebd \u1ea3nh h\u01b0\u1edfng \u0111\u1ebfn nhi\u1ec7t \u0111\u1ed9 v\u00e0 th\u00e0nh ph\u1ea7n c\u1ee7a n\u01b0\u1edbc, do \u0111\u00f3 l\u00e0m t\u0103ng s\u1ef1 ph\u00e1t tri\u1ec3n c\u1ee7a t\u1ea3o c\u00f3 th\u1ec3 l\u00e0m gi\u1ea3m ch\u1ea5t l\u01b0\u1ee3ng n\u01b0\u1edbc. Ch\u1ea5t l\u01b0\u1ee3ng n\u01b0\u1edbc k\u00e9m \u0111\u1ed3ng ngh\u0129a v\u1edbi vi\u1ec7c m\u00f4i tr\u01b0\u1eddng s\u1ed1ng kh\u00f4ng ph\u00f9 h\u1ee3p, c\u00f3 th\u1ec3 khi\u1ebfn c\u00e1 b\u1ecb c\u0103ng th\u1eb3ng, y\u1ebfu \u1edbt v\u00e0 cu\u1ed1i c\u00f9ng ch\u1ebft<\/p>\n

3. R\u1ee7i ro do ch\u1ea5t b\u1ea9n, \u00f4 nhi\u1ec5m v\u00e0o ngu\u1ed3n n\u01b0\u1edbc v\u00e0 v\u00e0o ao<\/strong><\/p>\n

Nh\u1eefng c\u01a1n m\u01b0a \u0111\u1ea7u m\u00f9a s\u1ebd l\u00f4i cu\u1ed1n c\u00e1c ch\u1ea5t b\u1ea9n, \u00f4 nhi\u1ec5m, vi sinh v\u1eadt t\u00edch t\u1ee5 l\u00e2u ng\u00e0y do kh\u00f4 h\u1ea1n nh\u01b0 b\u00f9n \u0111\u1ea5t, kh\u00ed \u0111\u1ed9c, vi khu\u1ea9n c\u00f3 h\u1ea1i trong c\u1ed1ng r\u00e3nh, h\u00f3a ch\u1ea5t, thu\u1ed1c tr\u1eeb s\u00e2u d\u00f9ng cho c\u00e2y tr\u1ed3ng v\u00e0o k\u00eanh m\u01b0\u01a1ng, ngu\u1ed3n n\u01b0\u1edbc chung. T\u00e1c \u0111\u1ed9ng n\u00e0y s\u1ebd r\u00f5 r\u00e0ng h\u01a1n khi nh\u1eefng c\u01a1n m\u01b0a l\u1edbn b\u1ea5t th\u01b0\u1eddng trong l\u00fac giao m\u00f9a n\u1eafng m\u01b0a s\u1ebd k\u00e9o \u0111\u1ed3ng lo\u1ea1t c\u00e1c ch\u1ea5t \u0111\u1ed9c v\u00e0 vi khu\u1ea9n \u0111\u1ed9c h\u1ea1i v\u00e0o ngu\u1ed3n n\u01b0\u1edbc chung. Ch\u1ea5t b\u1ea9n nhi\u1ec5m v\u00e0o n\u01b0\u1edbc v\u00e0 vi khu\u1ea9n sinh s\u00f4i n\u1ea3y n\u1edf nhanh khi c\u00f3 ngu\u1ed3n n\u01b0\u1edbc m\u1edbi s\u1ebd l\u00e0m oxy h\u00f2a tan gi\u1ea3m nhanh. \u0110i\u1ec1u n\u00e0y gi\u1ea3i th\u00edch t\u1ea1i sao c\u00e1 trong k\u00eanh, s\u00f4ng hay b\u1ecb ch\u1ebft \u0111\u1ed3ng lo\u1ea1t sau nh\u1eefng c\u01a1n m\u01b0a \u0111\u1ea7u m\u00f9a do thi\u1ebfu oxy v\u00e0 kh\u00ed \u0111\u1ed9c, ch\u1ea5t \u00f4 nhi\u1ec5m t\u0103ng \u0111\u1ed9t ng\u1ed9t trong n\u01b0\u1edbc.<\/p>\n

4. R\u1ee7i ro do b\u1ec7nh c\u00e1<\/strong><\/p>\n

\u0110i\u1ec1u ki\u1ec7n kh\u00f4 h\u1ea1n l\u00e0m t\u0103ng nguy c\u01a1 m\u1eafc m\u1ed9t s\u1ed1 b\u1ec7nh tr\u00ean c\u00e1. C\u00e1c b\u1ec7nh trong m\u00f9a n\u1eafng n\u00f3ng bao g\u1ed3m xu\u1ea5t huy\u1ebft do Aeromonas<\/em> sp., k\u00fd sinh s\u00e1n l\u00e1 v\u00e0 tr\u00f9ng b\u00e1nh xe tr\u00ean mang v\u00e0 da c\u00e1. B\u1ea5t k\u1ef3 nguy\u00ean nh\u00e2n g\u00e2y c\u0103ng th\u1eb3ng n\u00e0o c\u0169ng s\u1ebd khi\u1ebfn c\u00e1c b\u1ec7nh n\u00e0y d\u1ec5 x\u1ea3y ra h\u01a1n. C\u00e1c b\u1ec7nh do k\u00fd sinh tr\u00f9ng bao g\u1ed3m k\u00fd sinh tr\u00f9ng \u1edf mang c\u00f3 th\u1ec3 tr\u1edf th\u00e0nh v\u1ea5n \u0111\u1ec1 l\u1edbn do c\u00e1 s\u1ed1ng ch\u1eadt ch\u1ed9i trong c\u00e1c ao nh\u1ecf h\u01a1n. C\u00e1c vi khu\u1ea9n lu\u00f4n c\u00f3 s\u1eb5n trong n\u01b0\u1edbc thu\u1ed9c gi\u1ed1ng Aeromonas<\/em> th\u01b0\u1eddng g\u00e2y b\u1ec7nh khi oxy trong n\u01b0\u1edbc h\u00f2a tan gi\u1ea3m, c\u00e1 c\u0103ng th\u1eb3ng do m\u1eadt \u0111\u1ed9 d\u00e0y, c\u00e1 b\u1ecb t\u1ed5n th\u01b0\u01a1ng tr\u00ean da v\u00e0 mang do k\u00fd sinh tr\u00f9ng hay do ph\u00e2n c\u1ee1, chuy\u1ec3n ao hay m\u1edbi v\u1eadn chuy\u1ec3n c\u00e1 gi\u1ed1ng v\u1ec1 th\u1ea3 v\u00e0o ao, b\u00e8.<\/p>\n

B\u1ec7nh th\u1ed1i mang m\u00f2n v\u00e2y do Flavobacterium<\/em> sp. kh\u00f4ng th\u01b0\u1eddng x\u1ea3y ra trong m\u00f9a n\u1eafng n\u00f3ng nh\u01b0ng sau nh\u01b0ng c\u01a1n m\u01b0a l\u1edbn b\u1ea5t ch\u1ee3t \u0111\u1ea7u m\u00f9a (v\u0169 l\u01b0\u1ee3ng c\u00f3 khi l\u00ean \u0111\u1ebfn 100 mm) l\u00e0m ch\u1ea5t n\u01b0\u1edbc trong ao nh\u01b0 pH, nhi\u1ec7t \u0111\u1ed9 thay \u0111\u1ed5i \u0111\u1ed9t ng\u1ed9t n\u00ean b\u1ec7nh n\u00e0y th\u01b0\u1eddng b\u1ed9c ph\u00e1t. Vi khu\u1ea9n n\u00e0y c\u00f3 trong \u0111\u1ea5t c\u1ee7a h\u1ea7u h\u1ebft c\u00e1c ao v\u00e0 tr\u1edf th\u00e0nh m\u1ea7m b\u1ec7nh v\u1edbi \u0111\u1ed9c l\u1ef1c cao khi c\u00e1 b\u1ecb c\u0103ng th\u1eb3ng ho\u1eb7c m\u1eadt \u0111\u1ed9 c\u00e1 qu\u00e1 d\u00e0y. \u0110\u1ed9 ki\u1ec1m trong ao c\u00f3 th\u1ec3 \u0111\u01b0\u1ee3c t\u0103ng l\u00ean b\u1eb1ng c\u00e1ch b\u00f3n v\u00f4i 20 \u2013 25 kg\/1000 m2<\/sup> gi\u00fap l\u00e0m cho b\u1ec7nh do vi khu\u1ea9n n\u00e0y \u00edt nguy hi\u1ec3m h\u01a1n.<\/p>\n

C\u00e1c bi\u1ec7n ph\u00e1p gi\u00fap gi\u1ea3m thi\u1ec3u r\u1ee7i ro li\u00ean quan \u0111\u1ebfn giai \u0111o\u1ea1n chuy\u1ec3n m\u00f9a<\/h2>\n

1. Qu\u1ea1t n\u01b0\u1edbc, s\u1ee5c kh\u00ed cho ao: <\/strong>Oxy h\u00f2a tan trong ao \u0111\u01b0\u1ee3c bi\u1ebft l\u00e0 y\u1ebfu t\u1ed1 quan tr\u1ecdng nh\u1ea5t trong c\u00e1c ch\u1ec9 ti\u00eau h\u00f3a h\u1ecdc c\u1ee7a n\u01b0\u1edbc \u1ea3nh h\u01b0\u1edfng tr\u1ef1c ti\u1ebfp \u0111\u1ebfn s\u1ef1 ph\u00e1t tri\u1ec3n v\u00e0 s\u1ef1 s\u1ed1ng c\u1ee7a c\u00e1. Th\u00f4ng th\u01b0\u1eddng ai c\u0169ng bi\u1ebft r\u1eb1ng s\u1ee5c kh\u00f4ng kh\u00ed v\u00e0o n\u01b0\u1edbc l\u00e0 m\u1ed9t c\u00e1ch hi\u1ec7u qu\u1ea3 \u0111\u1ec3 c\u1ea3i thi\u1ec7n l\u01b0\u1ee3ng oxy h\u00f2a tan v\u00e0 h\u01a1n n\u1eefa l\u00e0 th\u00fac \u0111\u1ea9y s\u1ef1 l\u01b0u th\u00f4ng c\u1ee7a n\u01b0\u1edbc. C\u00e1c ph\u01b0\u01a1ng ph\u00e1p \u0111\u01a1n gi\u1ea3n \u0111\u1ec3 t\u0103ng h\u00e0m l\u01b0\u1ee3ng oxy bao g\u1ed3m s\u1eed d\u1ee5ng m\u00e1y s\u1ee5c kh\u00ed ho\u1eb7c qu\u1ea1t n\u01b0\u1edbc; c\u1ea3 hai \u0111\u1ec1u c\u00f2n gi\u00fap l\u00e0m gi\u1ea3m t\u00edch t\u1ee5 carbon dioxide trong n\u01b0\u1edbc.<\/p>\n

Nguy c\u01a1 thi\u1ebfu oxy trong n\u01b0\u1edbc ao nu\u00f4i t\u0103ng l\u00ean khi th\u1eddi ti\u1ebft kh\u00f4, n\u00f3ng. N\u01b0\u1edbc c\u00f3 nhi\u1ec7t \u0111\u1ed9 cao gi\u1eef \u00edt oxy h\u01a1n so v\u1edbi n\u01b0\u1edbc m\u00e1t h\u01a1n. T\u1ea3o ph\u00e1t tri\u1ec3n nhi\u1ec1u h\u01a1n \u1edf v\u00f9ng n\u01b0\u1edbc n\u00f4ng, \u1ea5m. M\u1eb7c d\u00f9 t\u1ea3o t\u1ea1o ra oxy v\u00e0o ban ng\u00e0y nh\u01b0ng ch\u00fang ti\u00eau th\u1ee5 oxy v\u00e0o ban \u0111\u00eam v\u00e0 khi tr\u1eddi nhi\u1ec1u m\u00e2y. \u00c1nh s\u00e1ng m\u1eb7t tr\u1eddi, khi c\u01b0\u1eddng \u0111\u1ed9 cao, c\u00f3 th\u1ec3 l\u00e0m t\u1ea3o n\u1edf hoa sau \u0111\u00f3 ch\u1ebft \u0111i \u0111\u1ed3ng lo\u1ea1t t\u1ea1o ra s\u1ef1 suy gi\u1ea3m oxy trong n\u01b0\u1edbc. M\u1eadt \u0111\u1ed9 c\u1ee7a c\u00e1 s\u1ebd tr\u1edf n\u00ean d\u00e0y h\u01a1n khi m\u1ef1c n\u01b0\u1edbc ao gi\u1ea3m v\u00e0 s\u1ebd l\u00e0m t\u0103ng nhu c\u1ea7u cho oxy cho th\u1ec3 t\u00edch n\u01b0\u1edbc ao.<\/p>\n

C\u00e1c thi\u1ebft b\u1ecb s\u1ee5c kh\u00ed c\u00f3 th\u1ec3 b\u1ea3o v\u1ec7 c\u00e1 trong ao khi h\u1ea1n h\u00e1n. Gi\u1ea3i ph\u00e1p \u0111\u01a1n gi\u1ea3n l\u00e0 mua m\u1ed9t m\u00e1y s\u1ee5c kh\u00ed \u0111i\u1ec7n cung c\u1ea5p kho\u1ea3ng 0,2 m\u00e3 l\u1ef1c nh\u1eb1m s\u1ee5c kh\u00ed hi\u1ec7u qu\u1ea3 tr\u00ean 1000 m2<\/sup> di\u1ec7n t\u00edch ao. V\u1eadn h\u00e0nh m\u00e1y s\u1ee5c kh\u00ed khi c\u1ea7n thi\u1ebft trong \u0111\u00eam, s\u00e1ng s\u1edbm v\u00e0 l\u00fac n\u01b0\u1edbc \u0111\u1ee9ng. C\u00e1c gi\u1ea3i ph\u00e1p s\u1ee5c kh\u00ed kh\u00e1c c\u00f3 th\u1ec3 bao g\u1ed3m m\u00e1y qu\u1ea1t n\u01b0\u1edbc. M\u00e1y qu\u1ea1t n\u01b0\u1edbc c\u00f3 th\u1ec3 c\u0169ng \u0111\u01b0\u1ee3c s\u1eed d\u1ee5ng \u0111\u1ec3 tu\u1ea7n ho\u00e0n n\u01b0\u1edbc ao. N\u01b0\u1edbc n\u00ean \u0111\u01b0\u1ee3c qu\u1ea1t b\u1eafn v\u00e0o kh\u00f4ng kh\u00ed \u00edt nh\u1ea5t \u0111\u1ea1t \u0111\u01b0\u1ee3c \u0111\u1ed9 cao 0,6 m \u0111\u1ec3 t\u0103ng h\u00e0m l\u01b0\u1ee3ng oxy khu\u1ebfch t\u00e1n v\u00e0o n\u01b0\u1edbc.<\/p>\n

\"\"<\/p>\n

D\u1ea5u hi\u1ec7u c\u1ea3nh b\u00e1o v\u1ec1 t\u00ecnh tr\u1ea1ng c\u1ea1n ki\u1ec7t oxy:<\/em><\/strong><\/p>\n

– Ki\u1ec3m tra ao, b\u00e8 l\u00e0 vi\u1ec7c \u0111\u1ea7u ti\u00ean n\u00ean l\u00e0m v\u00e0o bu\u1ed5i s\u00e1ng l\u00fac 6h. \u0110\u00e2y l\u00e0 th\u1eddi \u0111i\u1ec3m l\u01b0\u1ee3ng oxy h\u00f2a tan th\u1ea5p nh\u1ea5t.<\/p>\n

– Theo d\u00f5i s\u1ef1 thay \u0111\u1ed5i m\u00e0u s\u1eafc c\u1ee7a n\u01b0\u1edbc ao. S\u1ef1 thay \u0111\u1ed5i t\u1eeb xanh l\u1ee5c sang n\u00e2u ho\u1eb7c x\u00e1m c\u00f3 th\u1ec3 cho th\u1ea5y t\u1ea3o ch\u1ebft v\u00e0 suy gi\u1ea3m oxy s\u1ebd x\u1ea3y ra trong 24 \u0111\u1ebfn 48 gi\u1edd sau \u0111\u00f3.<\/p>\n

– Th\u1eddi ti\u1ebft nhi\u1ec1u m\u00e2y l\u00e0m gi\u1ea3m l\u01b0\u1ee3ng \u00e1nh s\u00e1ng cho qu\u00e1 tr\u00ecnh s\u1ea3n xu\u1ea5t oxy t\u1eeb t\u1ea3o. Hai ho\u1eb7c ba ng\u00e0y th\u1eddi ti\u1ebft c\u00f3 nhi\u1ec1u m\u00e2y c\u00f3 th\u1ec3 l\u00e0m thi\u1ebfu oxy v\u00e0o ng\u00e0y h\u00f4m sau.<\/p>\n

– Gi\u00f3 l\u1edbn c\u00f3 th\u1ec3 l\u00e0m cho ao c\u1ea1n b\u1ecb tr\u1ed9n l\u1eabn n\u01b0\u1edbc trong c\u00e1c t\u1ea7ng n\u01b0\u1edbc kh\u00e1c nhau. \u0110i\u1ec1u n\u00e0y \u0111\u1eb7c bi\u1ec7t nguy hi\u1ec3m khi t\u1ea3o n\u1edf hoa d\u00e0y \u0111\u1eb7c.<\/p>\n

– Theo d\u00f5i t\u00ecnh tr\u1ea1ng v\u00e0 ho\u1ea1t \u0111\u1ed9ng b\u1eaft m\u1ed3i c\u1ee7a c\u00e1 \u0111\u1ec3 ph\u00e1t hi\u1ec7n c\u00e1c d\u1ea5u hi\u1ec7u c\u1ee7a oxy th\u1ea5p ho\u1eb7c b\u1ec7nh c\u00e1. Khi c\u00e1 \u0111\u01b0\u1ee3c cho \u0103n th\u1ee9c \u0103n vi\u00ean n\u1ed5i, ch\u00fang s\u1ebd ng\u1eebng b\u1eaft m\u1ed3i khi oxy th\u1ea5p.<\/p>\n

– C\u00e1 s\u1ebd n\u1ed5i l\u00ean m\u1eb7t n\u01b0\u1edbc v\u00e0o bu\u1ed5i s\u00e1ng v\u00e0 \u0111\u1edbp kh\u00f4ng kh\u00ed khi s\u1ef1 suy gi\u1ea3m oxy b\u1eaft \u0111\u1ea7u. Ngay l\u1eadp t\u1ee9c b\u1eadt qu\u1ea1t n\u01b0\u1edbc hay s\u1ee5c kh\u00ed.<\/p>\n

2. C\u1ea5p n\u01b0\u1edbc:<\/strong> Ng\u01b0\u1eddi nu\u00f4i n\u00ean c\u00e2n nh\u1eafc vi\u1ec7c b\u1ed5 sung ngu\u1ed3n n\u01b0\u1edbc trong ao c\u1ee7a h\u1ecd th\u01b0\u1eddng xuy\u00ean khi c\u1ea7n thi\u1ebft, v\u00e0 ki\u1ec3m so\u00e1t l\u01b0\u1ee3ng sinh v\u1eadt ph\u00f9 du \u0111\u1ec3 ch\u00fang kh\u00f4ng ph\u00e1t tri\u1ec3n qu\u00e1 nhi\u1ec1u. Theo \u0111\u00f3, \u0111\u1ed9 trong c\u1ee7a n\u01b0\u1edbc \u0111\u01b0\u1ee3c ch\u1ea5p nh\u1eadn l\u00e0 30 cm tr\u00ean \u0111\u0129a secchi. N\u1ebfu c\u00f3 qu\u00e1 nhi\u1ec1u sinh v\u1eadt ph\u00f9 du (\u0111\u1ed9 trong < 20 cm tr\u00ean \u0111\u0129a secchi), \u0111i\u1ec1u n\u00e0y s\u1ebd d\u1eabn \u0111\u1ebfn m\u1ee9c \u0111\u1ed9 thi\u1ebfu oxy nghi\u00eam tr\u1ecdng (d\u01b0\u1edbi 1 miligam \/l\u00edt), g\u00e2y nguy hi\u1ec3m cho s\u1ef1 s\u1ed1ng c\u1ee7a c\u00e1.<\/p>\n

3. Ki\u1ec3m so\u00e1t l\u01b0\u1ee3ng th\u1ee9c \u0103n cho \u0103n:<\/strong> L\u01b0\u1ee3ng th\u1ee9c \u0103n d\u01b0 th\u1eeba s\u1ebd ch\u1ec9 \u0111\u01a1n gi\u1ea3n l\u00e0 \u0111\u01b0a ch\u1ea5t th\u1ea3i v\u00e0 NH3<\/sub> v\u00e0o n\u01b0\u1edbc. \u0110i\u1ec1u n\u00e0y c\u00f3 th\u1ec3 d\u1eabn \u0111\u1ebfn vi\u1ec7c c\u00e1 b\u1ecb c\u0103ng th\u1eb3ng v\u00e0 c\u00f3 th\u1ec3 ch\u1ebft. Khi kh\u00f4ng th\u1ec3 thay n\u01b0\u1edbc ho\u1eb7c trong th\u1eddi gian nhi\u1ec7t \u0111\u1ed9 n\u01b0\u1edbc gi\u1ea3m \u0111\u1ed9t ng\u1ed9t do m\u01b0a l\u1edbn b\u1ea5t th\u01b0\u1eddng, c\u00e1 c\u00f3 xu h\u01b0\u1edbng gi\u1ea3m \u0103n; v\u00e0 do v\u1eady, vi\u1ec7c \u0111i\u1ec1u ch\u1ec9nh gi\u1ea3m l\u01b0\u1ee3ng th\u1ee9c \u0103n cho \u0103n ph\u00f9 h\u1ee3p s\u1ebd r\u1ea5t c\u00f3 l\u1ee3i.<\/p>\n

4. Xem x\u00e9t l\u1eadp k\u1ebf ho\u1ea1ch s\u1ea3n l\u01b0\u1ee3ng<\/strong>: S\u1ea3n l\u01b0\u1ee3ng trong m\u1ed7i v\u1ee5 nu\u00f4i hay \u0111\u1ee3t s\u1ea3n xu\u1ea5t c\u00e1 gi\u1ed1ng c\u1ea7n \u0111\u01b0\u1ee3c t\u00ednh to\u00e1n nh\u1eb1m gi\u1ea3m thi\u1ec3u nh\u1eefng r\u1ee7i ro li\u00ean quan \u0111\u1ebfn m\u00f9a \u0111ang nu\u00f4i c\u00e1 cho d\u00f9 \u0111\u00f3 l\u00e0 m\u00f9a l\u0169 l\u1ee5t ho\u1eb7c h\u1ea1n h\u00e1n. N\u00ean c\u1eaft gi\u1ea3m \u00bc s\u1ea3n l\u01b0\u1ee3ng trong nh\u1eefng kho\u1ea3ng th\u1eddi gian kh\u00f4 h\u1ea1n v\u00e0 giao m\u00f9a.<\/p>\n

5. C\u00e2n nh\u1eafc vi\u1ec7c th\u1ea3 c\u00e1 gi\u1ed1ng<\/strong>: N\u00ean th\u1ea3 c\u00e1 gi\u1ed1ng c\u00f3 k\u00edch th\u01b0\u1edbc l\u1edbn \u0111\u1ec3 gi\u1ea3m t\u1ef7 l\u1ec7 c\u00e1 hao h\u1ee5t sau khi th\u1ea3 nu\u00f4i, gi\u1ea3m t\u1ed5ng th\u1eddi gian nu\u00f4i, ho\u1eb7c th\u1ea3 c\u00e1 v\u1edbi m\u1eadt \u0111\u1ed9 th\u1ea5p h\u01a1n. B\u1eb1ng c\u00e1ch \u00e1p d\u1ee5ng nh\u01b0 v\u1eady, ao c\u00f3 nhi\u1ec1u kh\u1ea3 n\u0103ng s\u1ebd cho ra c\u00e1 ch\u1ea5t l\u01b0\u1ee3ng cao h\u01a1n, do \u0111\u00f3, thu \u0111\u01b0\u1ee3c l\u1ee3i nhu\u1eadn t\u1ed1t h\u01a1n.<\/p>\n

6. \u0110\u1ed1i v\u1edbi b\u00e8 nu\u00f4i: <\/strong>Ng\u01b0\u1eddi nu\u00f4i c\u1ea7n b\u1ed1 tr\u00ed tr\u00e1nh n\u1eafng chi\u1ebfu gay g\u1eaft tr\u1ef1c ti\u1ebfp b\u1eb1ng h\u1ec7 th\u1ed1ng l\u01b0\u1edbi m\u00e0ng, b\u1ea1t d\u1ec5 thao t\u00e1c v\u00e0 th\u00e1o l\u1eafp.<\/p>\n

7. Ch\u0103m s\u00f3c nu\u00f4i d\u01b0\u1ee1ng: <\/strong>Kh\u1ea9u ph\u1ea7n \u0103n \u0111\u1ea3m b\u1ea3o ch\u1ea5t l\u01b0\u1ee3ng, ph\u00f9 h\u1ee3p v\u1edbi t\u1eebng giai \u0111o\u1ea1n ph\u00e1t tri\u1ec3n c\u1ee7a c\u00e1 l\u00e0 y\u00eau c\u1ea7u quan tr\u1ecdng. \u0110\u1ed3ng th\u1eddi b\u1ed5 sung th\u00eam Vitamin C, B complex, men ti\u00eau h\u00f3a \u0111\u1ec3 t\u0103ng kh\u1ea3 n\u0103ng h\u1ea5p th\u1ee5 th\u1ee9c \u0103n nh\u1eb1m n\u00e2ng cao s\u1ee9c \u0111\u1ec1 kh\u00e1ng v\u1eadt nu\u00f4i. \u0110i\u1ec1u n\u00e0y gi\u00fap tr\u00e1nh \u0111\u01b0\u1ee3c hi\u1ec7n t\u01b0\u1ee3ng c\u00e1 \u0111i ph\u00e2n s\u1ed1ng hay x\u1ea3y ra trong th\u1eddi k\u1ef3 n\u1eafng n\u00f3ng.<\/p>\n

8. C\u00f4ng t\u00e1c v\u1ec7 sinh ti\u00eau \u0111\u1ed9c kh\u1eed tr\u00f9ng: <\/strong>H\u1eb1ng ng\u00e0y ph\u1ea3i v\u1ec7 sinh s\u1ea1ch s\u1ebd t\u1eeb trong ra ngo\u00e0i b\u00e8, xung quanh ao nu\u00f4i. D\u1ecdn d\u1eb9p l\u1ee5c b\u00ecnh v\u01b0\u1edbng quanh b\u00e8, v\u1edbt b\u1ecf x\u00e1c c\u00e1 ch\u1ebft v\u00e0o n\u01a1i quy \u0111\u1ecbnh, v\u1edbt s\u1ea1ch r\u00e1c, v\u1ecf chai l\u1ecd thu\u1ed1c, v\u1ecf bao th\u1ee9c \u0103n trong ao v\u00e0 tr\u00ean k\u00eanh m\u01b0\u01a1ng.<\/p>\n

9. C\u00f4ng t\u00e1c ph\u00f2ng b\u1ec7nh: <\/strong>H\u1eb1ng ng\u00e0y theo d\u00f5i s\u1ee9c kh\u1ecfe \u0111\u00e0n c\u00e1 nu\u00f4i, ph\u00e1t hi\u1ec7n s\u1edbm c\u00e1 nu\u00f4i c\u00f3 bi\u1ec3u hi\u1ec7n b\u1ea5t th\u01b0\u1eddng \u0111\u1ec3 \u0111i\u1ec1u tr\u1ecb k\u1ecbp th\u1eddi. N\u1ebfu s\u1ed1 l\u01b0\u1ee3ng nh\u1ecf c\u00e1 b\u1ecb b\u1ec7nh nh\u01b0ng kh\u00f4ng th\u1ea5y bi\u1ec3u hi\u1ec7n l\u00e2y lan th\u00ec \u00e1p d\u1ee5ng ngay c\u1ea5p thu\u1ed1c tr\u1ee3 s\u1ee9c, tr\u1ee3 l\u1ef1c qua th\u1ee9c \u0103n nh\u01b0 vitamin C v\u00e0 \u0111i\u1ec1u ch\u1ec9nh , c\u1ea3i thi\u1ec7n ch\u1ea5t l\u01b0\u1ee3ng n\u01b0\u1edbc. Tr\u01b0\u1eddng h\u1ee3p th\u1ea5y c\u00e1 c\u00f3 tri\u1ec7u ch\u1ee9ng b\u1ec7nh n\u1eb7ng, l\u00e2y lan nhanh, s\u1ed1 l\u01b0\u1ee3ng ch\u1ebft t\u0103ng d\u1ea7n h\u1eb1ng ng\u00e0y kh\u00f3 ki\u1ec3m so\u00e1t, c\u1ea7n b\u00e1o ngay cho ng\u01b0\u1eddi c\u00f3 chuy\u00ean m\u00f4n v\u00e0 tr\u00e1ch nhi\u1ec7m \u0111\u1ec3 \u0111\u01b0\u1ee3c h\u01b0\u1edbng d\u1eabn x\u1eed l\u00fd k\u1ecbp th\u1eddi.<\/p>\n

Kh\u00f4ng n\u00ean t\u00e1c \u0111\u1ed9ng \u0111\u1ebfn \u0111\u00e0n c\u00e1 nh\u01b0 chuy\u1ec3n ao, ph\u00e2n c\u1ee1 v\u00e0o nh\u1eefng ng\u00e0y th\u1eddi ti\u1ebft nhi\u1ec1u m\u00e2y \u00e2m u, sau c\u01a1n m\u01b0a, l\u00fac c\u00e1 \u0111ang b\u1eaft m\u1ed3i y\u1ebfu. Tr\u01b0\u1edbc khi t\u00e1c \u0111\u1ed9ng v\u00e0o \u0111\u00e0n c\u00e1 n\u00ean t\u0103ng c\u01b0\u1eddng s\u1ee9c \u0111\u1ec1 kh\u00e1ng b\u1ec7nh cho c\u00e1 b\u1eb1ng c\u00e1ch b\u1ed5 sung vitamin C li\u1ec1u 10 g\/t\u1ea5n c\u00e1 hay beta glucan (s\u1eed d\u1ee5ng theo li\u1ec1u h\u01b0\u1edbng d\u1eabn c\u1ee7a nh\u00e0 s\u1ea3n xu\u1ea5t) li\u00ean t\u1ee5c trong 5 – 7 ng\u00e0y. Th\u00eam v\u00e0o \u0111\u00f3 lu\u00f4n ghi nh\u1edb c\u1eaft m\u1ed3i ho\u00e0n to\u00e0n 2 \u2013 3 c\u1eef cho \u0103n tr\u01b0\u1edbc v\u00e0 sau khi t\u00e1c \u0111\u1ed9ng v\u00e0o \u0111\u00e0n c\u00e1. Khi b\u1eaft \u0111\u1ea7u cho c\u00e1 \u0103n l\u1ea1i n\u00ean cho \u0103n v\u1edbi l\u01b0\u1ee3ng t\u0103ng d\u1ea7n t\u1eeb 20 \u2013 100 % l\u01b0\u1ee3ng \u0103n trong 3 \u2013 4 ng\u00e0y.<\/p>\n

N\u1ebfu nghi ng\u1edd n\u01b0\u1edbc nhi\u1ec5m thu\u1ed1c tr\u1eeb s\u00e2u, kh\u00f4ng n\u00ean c\u1ea5p n\u01b0\u1edbc v\u00e0o ao. N\u1ebfu th\u1ec3 t\u00edch n\u01b0\u1edbc c\u1ea7n s\u1eed d\u1ee5ng kh\u00f4ng qu\u00e1 l\u1edbn, c\u00f3 th\u1ec3 x\u1eed l\u00fd n\u01b0\u1edbc b\u1eb1ng thu\u1ed1c t\u00edm KMnO4<\/sub> 2 – 4 mg\/L tr\u01b0\u1edbc khi c\u1ea5p cho b\u1ec3 h\u01b0\u01a1ng hay gi\u1ed1ng. N\u1ed3ng \u0111\u1ed9 thu\u1ed1c t\u00edm n\u00e0y c\u0169ng c\u00f3 th\u1ec3 x\u1eed l\u00fd kh\u00ed \u0111\u1ed9c H2<\/sub>S trong ao.<\/p>\n

Theo d\u00f5i tin t\u1ee9c d\u1ef1 b\u00e1o th\u1eddi ti\u1ebft h\u1eb1ng ng\u00e0y. Tr\u01b0\u1edbc nh\u1eefng ng\u00e0y \u0111\u01b0\u1ee3c d\u1ef1 b\u00e1o c\u00f3 m\u01b0a to n\u00ean r\u1ea3i v\u00f4i CaCO3<\/sub> \u0111\u1ec1u kh\u1eafp b\u1edd ao v\u1edbi l\u01b0\u1ee3ng 20 \u2013 25 kg t\u00ednh cho di\u1ec7n t\u00edch 1.000 m2<\/sup> m\u1eb7t n\u01b0\u1edbc ao.<\/p>\n<\/div>","protected":false},"excerpt":{"rendered":"

Giai \u0111o\u1ea1n giao m\u00f9a n\u1eafng v\u00e0 m\u01b0a \u1edf \u0110\u00f4ng Nam B\u1ed9 v\u00e0 \u0110\u1ed3ng b\u1eb1ng s\u00f4ng C\u1eedu Long k\u00e9o d\u00e0i t\u1eeb gi\u1eefa th\u00e1ng t\u01b0 \u0111\u1ebfn cu\u1ed1i th\u00e1ng n\u0103m h\u1eb1ng n\u0103m. Th\u1eddi ti\u1ebft giai \u0111o\u1ea1n n\u00e0y c\u00f3 \u0111\u1eb7c \u0111i\u1ec3m n\u1eafng n\u00f3ng li\u00ean t\u1ee5c v\u00e0 c\u00f3 nh\u1eefng c\u01a1n m\u01b0a \u0111\u1ea7u m\u00f9a v\u1edbi v\u0169 l\u01b0\u1ee3ng th\u1ea5p, m\u01b0a c\u1ee5c b\u1ed9 v\u00e0i n\u01a1i trong \u0111\u1ecba ph\u01b0\u01a1ng. \u0110\u00f4i khi m\u1ed9t v\u00e0i c\u01a1n m\u01b0a v\u1edbi v\u0169 l\u01b0\u1ee3ng cao b\u1ea5t th\u01b0\u1eddng c\u0169ng x\u1ea3y ra. Tuy nhi\u00ean, m\u01b0a l\u1edbn v\u1eabn ch\u1ec9 \u1edf m\u1ed9t v\u00e0i \u0111\u1ecba ph\u01b0\u01a1ng, khu v\u1ef1c. Giai \u0111o\u1ea1n chuy\u1ec3n m\u00f9a n\u00e0y ch\u1ec9 k\u1ebft th\u00fac v\u00e0 th\u1eddi ti\u1ebft b\u1eaft \u0111\u1ea7u ch\u00ednh th\u1ee9c b\u01b0\u1edbc v\u00e0o m\u00f9a m\u01b0a khi m\u01b0a th\u01b0\u1eddng xu\u1ea5t hi\u1ec7n v\u1edbi v\u0169 l\u01b0\u1ee3ng cao v\u00e0 tr\u1ea3i \u0111\u1ec1u tr\u00ean to\u00e0n khu v\u1ef1c.<\/p>\n","protected":false},"author":1,"featured_media":2115,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[14],"tags":[145],"class_list":["post-2112","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-tu-lieu-ky-thuat","tag-thuy-san-viet-nam"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/posts\/2112","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/comments?post=2112"}],"version-history":[{"count":4,"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/posts\/2112\/revisions"}],"predecessor-version":[{"id":2118,"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/posts\/2112\/revisions\/2118"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/media\/2115"}],"wp:attachment":[{"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/media?parent=2112"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/categories?post=2112"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.greenfeed.com.vn\/thuy-san\/wp-json\/wp\/v2\/tags?post=2112"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}