i 3
KHOA HOC K^THU^T
ANH HCONG CtiA TRUN QUE (PERIONYXEXCAVATUS) TlfOl B t N Si; TANG TRU^OfNG VA KHA NANG
KHANG BENH CHO TOM SU
TliS. Nguyen Van Minh' C ^ y ^ ^ ^^'•5'' Duong Nhdt Linh' DuNggc Tudn- TOM TAT
Trong nghien ciru ndy, chung toi dd nghien cuu dnh hirdng cua 3 muc t\- le giun que bo sung (JO, 20 vd 3()%) vdo khdu phdn'dn den .su tdng trudng vd khd ndng khdng benh cho torn sii nudi thuang phdm. Ket qud nghien ciru cho thdy rdng vdi ty (i hd .sung 20% trim qui dd cd dnh hirdrng tdt den su tdng trudng vd khd ndng khdng benh cho tdm su. Kit qud thi nghiim con cho thdy rdng tdm a ao ihi nghiem tdng trucmg tot. khde manh, it binh va cho hiiu qud kinh te cao hom Id doi chung Id 41,7%.
ABSTRACT
In this research, we studied the ajfect of three different rates of Perionyx excavatus (JO %. 20 % and 30 %) to be added in the food stuff for black tiger shrimp in order to improve their growth and disease resistance. The study results showed that the most effectiveness has gained at the rate of 20% of Perionyx excavatus to he added in shrimp food. The study results also showed that experiment shrimp have better growth, healthy
and less disease and gained 4 J,7% economic benefit higher than the control.
MOT dau
Thiiy san Id mfit trong nhiing nganh mang Iai lgi nhuan cao cho nen kinh td quoc dan vd thu hut nhidu lao dgng. Ben canh nhirng thanh luu vd sg phat trien cua nganh, nuoi torn d Viet Nam cfin nhidu van de ton dpng ma vdn dS quan trgng nhdt la dich bdnh gdy chet hang loat da gay nhidu tfin that cho ngufii nufii tom nfii rieng vd nganh thuy san noi chung. Van dd dat ra hidn nay la lim ra nhiing giai pbap ban chd tfii da cdc tac nhdn gay benh Cling nhu no luc thuc hipn cac ky thudt nuoi hgp ly vd hidu qua ma van ddm bdo dugc sg phat tridn ben viing. Mat khdc, chi phi thirc an chiem phan Ion trong chi phi ca vu nuoi. Vi vdy, bat cii bien phdp ndo tao ra nguon thirc an giau dinh dufi-ng. viia cfi kba ndng khdng bdnh, de
tim kidm, de san xudt tai cho va ddu tu tbap Id viec ldm cap thiet va cfi y nghia thidt thuc, giup giam chi phi nuoi va dem lai hi^u qua kinh td cao.
CJ Viet Nam, trong thfii gian gdn day.
trim que dugc chii y den vi la mgt trong nhirng ioai thirc an c6 gia trj dinh duong voi ham lugng protein kha cao dugc diing trong ehan nufii gia cam, gia sue va nuoi trfing thuy san. Tai Philippine, triin que dugc Met kd vdo danh mgc thiic an cfi gia tri dinh duang cao cho nufii trfing thuy sdn [8]. Tai Viet Nam, tir nam 2000 da cfi mfit so cfing trinh nghien ciiu ung dung triin qud Idm thtic an trong nuoi trong ibiiy san nhu: nghien ciiu qua trinh tg phan cua trim que nhdm lao ra san pham gidu dam lam thuc an cho tfim va cd con;
nghien ciiu su dung trim que nhu Id ngufin ' Giang vien Khoa C6ng Nghf Sinh hpe Trudng Dgi hpe Ma TPHCM
'Chi afc num trdng ihuy san Tinh Ninh Thugn
TAP CHf KHOA HQC SO 5 (23) 2011 protein lam Ihirc an cho ca tre lai; img
dung bgt dam ihuy phan lit trim qud lam ihiic an cho an trim torn sii [2.4. 5]. Phan Irim hien da dugc cac Trung tdm khuyen ngu Tinh Khanh Hoa. Phti Yen. Kinh Thudn. pho bidn cdc ba con nuoi torn sir dung de gay mau nuac, 6n dinh tao, xii ly ao nuoi tfim. Cung co nhOng khuyen cao cbo rdng sii dung trim que Idm thirc dn cho tfim ngoai vide cung cap dinh duang con giup tom cfi sire dc khang cao, khfie manh va vugt qua benh phdn trang va tang truang nhanh [2,3.4. 5.6.9. 10. 11]. Tuy nhien. kha nang giup tom de khang hay vugt qua b?nh chua dugc cac nhd khoa hgc chung minb rfi rang va ciing chua co cong trinh khoa hgc nao cong bo vd tac dyng cua trim qud doi vfi^i tfim. Do do, vi?c nghien ciiu. lim ra ty Id Iriin que bo sung vdo khau phdn dn nham tdng trgng.
khang nhGng b^nh ihuang gpp co y nghia tich cgc cho nuoi torn va nuoi triin que cflng nghiep a nufic la.
NGUYEN LIEU VA PHUOfNG PHAPNGHIEN ClJu
NguySn lidu
Trim que tuoi va phdn trim qud dugc nuoi tai Irai trim qud Nggc Thjnh (Hg Diem. Ninh Thuan).
Phinrng phap nghien ciru T h i nghiem do tim ty Id bd sung thich hop
Cac dii nghidm dugc lien hanh nham ddnh gia. so sdnh sinh truang giiia cac nghiem thiic co bo sung (rim que 6 cdc miic ty Id khac nhau vd'i nghiem thiic doi chiing su dung hodn loan thiic dn cong nghiep. Qua do xdc dinh muc tS' Id triin que bo sung thich hgp nhat dd lidp tuc lien hanh thi nghiem chinh thiic tren quy mo cd ao nuoi tom.
Cach dung 6 thi nghiem: 6 thi nghiem gom hai phan: 6 Icm ( S = 15m^) ky hi?u la (A) ben trong gom co 4 o nho (S
= 3.75m-) ky hidu Id (B). Nhu v?iy, 1 Aco 4 B, bo tri 3 A phdn bo deu trong ao nuoi.
Trong A ta bo tri 4 nghidm thiic nhu sau.
Bang I. Cac muc ty le trim que trong thi nghiem thdm db
Thirc Nghiam 1 7
3 4 an
Ihijrc
Thijc Sn congr
90 80 70 100
ighiep
(%)
Triir 1 qui (%)10 20 30 0
Thi nghiem chfnh thiit
Bang 2. Mirc ty Id triin que trong thi nghiem chinh thirc
Nghiem lliiic
Thuc in CN (%)
Triin que
fiO
lOO
Ty 1^ TN iham doiDiing phan triin t5kg/'IOOO m- de g i ) lao Doi chirng
KHOA HOC K? THUAT 125 Lua chpn con gidng vd ky thagt thd
Hidng]\,l]
• Chnn tom giong: tom gifing dugc chgn mua tai ca sfi san xudt trdn dia bdn tmh Ninh Thudn. Tfim giong dugc danh gia cam quan true tidp lai bd VS hoat dfing, mau sac, kich co, duang mgt, di hinh, dfing rong va xet nghidm mgt so chi lieu bdnh virus nhu MBV (Monodon baculovirus), WSSV (White spot syndrome virus) tai Trung lam Khuyen ngu Ninh Thudn, sii dung bfi kit cua cong ty Nam Khoa.
• Mat dd gidng thd: 20 con/m- vfii thi nghidm thdm dfi va 22 con/m^ vcri thi nghiem chinh ihiic.
• Kich cd gidng ihd; PL 15.
• Ky ihudt thd gidng; Giong dugc van chuyen tir trai sdn xuat vd ddn ao nuoi bdng phucmg phip v^n chuyen kin CO bom oxy. Cac yeu to moi truong ao nufii trufic khi tha gifing ddu nam trong pham vi thich hgp (pH 7,5- 8,35; dp mdn 15-30%"; oxy hfia tan 5-6 mg/L; dfi kidm > 80mg CaCO,;
do trong 30-40cm; H,S < 0.03mg''L;
amonia < 0.1 mg/L). Trufic khi thd tien hanh thudn hoa cho tfim giong thich nghj dan vfii dieu kidn moi trufifiig nufic ao nuoi nhu sau: ddt nii chiia tom vdo nufic ao it nhal 30 phitt, sau dfi mfi tiii ra cho vao tin mgt lugng nufic ao bang vfii lugng nuoc trong liii, sau 30 phut thi thd tfim vao ao.
Qudn ly cho dn (I, ?j
Sii dung thuc an cong nghidp nhan hieu TOMBOY va kdl hgp bo sung tnin que tuai vao khdu phan an cua tfim. Tnin que dugc xay nhuyen, trgn thdm mgt sfi thiic an bfi sung nhuvitamine C, Men Bo, iron vfii thiic an cfing nghiep. dd cho rao 30 pbiit trufic khi cho tom an. Cho tom an
• 4 lan/ngdy vdo cdc gio co dinh: 6 gio, 11
gia; 17 gio^ va 22 gifi. Thiic an dugc rdi ddu khap ao, theo dufing cho an Tfim cang lfim thi pham vi cho an cang dugc mfi rfing.
Khfing rdi thirc an vao khu vuc tap trung chat ihdi. bim (ihufing Id khu vuc gitra ao.
cdc goc ao).
Xdc dinh tdc dp sinh trudng, ty ti song vd he sd chuyen hda thurc dn {}, 7f
Mau dugc thu nhieu ldn dc can. do nhanh va tha torn lai ao. Moi lan kicm tra 30-50 cd thd.
Tdc dp sinh tnrdng trung hinh ngay (ADGj theo khoi lugng cua torn dugc tinh nhu sau:
W, - W|
ADG (g/con/ngay) = ^^ _ ^ Trong do: ADG la loc dg smh trucmg trung binh ngay (g/con/ngay); W^ la khfii lugng lom irung binh ldn kiem tra trufic (g/
«)n); W,: Khoi lugng torn trung binh lan kicm tra sau (g/'con); t, l, - t : Khodng thai gian giua 2 ldn kiem tra (ngdyl
Ti te sdng cua tdm (survi\'al rate. SR} (Xt) n - 100
Trong do: n la sfi lugng tfim liic thu hoach; N la so lugng lom thd ban ddu
Hi sd chuyin hda thuc dn: He so chuyen hoa thiic an (FCR) dugc tinh bang each lay tfing Iugng thiic an da cho an chia cho tfing Iugng tfim luc thu hoach.
Quan trdc cdcyiu to mdi trtrcrng va theo doi binh tren torn nuoi
Quan trdc cdc yiu to moi inrong flf: cac chl lieu thfing sfi chat lugng nufic dugc theo doi hang ngay ia:
• pH dugc do vfii tan sudt 2 Idn/ngay:
vdo llic 6 gifi va 15 gifi.
• Dfi kidm dugc do voi tan sudt 3 ngay/
lan. do vao Iiic 10 gio sang.
• Do man dugc do voi tdn sudt 3 ngay' lan, do vdo luc 10 gifi sang.
• Nhiel do dugc do vdi tdn sudt 2 lan' ngay, do vao liic 6 gifi sang vd 15 gifi.
126 T^P CHf KHOA HOC SO 5 (23) 2011
• Do trong dugc do 3 ngay/ldn, do vao llic iO gio sang.
• Mau nufic: quan sal true quan.
• Oxy hfia tan (DO) dugc do vfii tdn sudt 2 Idn/ngay, do vdo liic 5 gio' sang va 15 gio.
- Ammonia dugc dn vfii tan suat 3 ngay/ldn, do vao liic 10 gio sang.
Theo ddi cdc mdm binh trong ao nuoi
• Danh gia cdc chi lieu lam sang: theo doi hang ngay cdc chi tidu ve siic an, mdu sac. cac hien tugng dong rong.
phfing duoi. mat co quan phu bg, phan trdng, dien bien a rugt (thirc dn.
mau sac gan tuy....),...
• Tlieo doi cac chi lieu benh: kiem tra WSSV vd MBV tfim gifing trufic khi thd nufii. trong qua trinh nufii kidm tra neu co dau hieu bdnh.
cua Microsoft voi do tin cdy ?< 0,05, Kdt qua trinh bay gom gia tri trung binh ± SD
K E T QUA VA T H A O LUAN T\\\ nghiem tham do dugc thgc hicn tir 01/04/2007 • * 29.-'07/2007,
Thi nghidm dugc lien hdnh tai dia torn ciia fing Biii Trung Hd. thfin Phuong Cim, xa Phuang Hai. Huyen Ninh Slai.
Tinh Ninh Thuan. So lieu trinh bay trong bdng la gia Iri trung binh ± SD.
Thi nghlem t h a m do
Tdc dp tang tnrdng, hifu qud sri*
dung thirc an va ti li song
Toe do tang inrfing cua l6m nuoi dugc kidm tra bat ddu tir ngay nufii thii 30, Tir ngdy nuoi thii 30 den ngay nuoi ihii 60 kiem tra dinh ky 15 ngdy/ ldn: tir ngay nufii thii 61 den cufii vu kiem tra dinh ky 10 nga' lan. Ket qud kicm tra sinh truang dirge the hien trong bieu do I.
Xfr ly ket q u a : ket qud dugc xu ly thong ke ANOVA cua phan mem Excel
Bieu do 1. Bieu do bieu dien tang trirong ve chieu dai va Iri^ng lu-gng cua torn nudi it cdc nghifm thfrc 1,2,3 va doi chung
Bang 3. Toe do tang tnro'ng, ty le song, he •to chuyen hoa thfrc an Nghiem Trong lirgng torn Trong Iirong lom
thuc 30 ngay tuoi (g) thu hoach (g) DWG
(g/ngaj) SR(%) FCR
N T l KT2 KT3 DC
2.76±0.I' 3.6*0.02' 4 l±0.09"
2.13±0.07
16.811.86- O.ISiO.OOOl- 94.17±0.39' l.58±0.02 20.6±0.32'' 0.19±0.0001'' 94.67±0.89" l,36±0,02- 20.0*0.38" O.ISiO.OOOl' 93.6±1 04- 1.54±0.03 1647*2.04' 0.16*0.0002- 94 33*0.72' 1.67*0.01"
cfi y nghia thfing ke (P < 0,05) giua NT 2.
NT 3 so voi Ifi dfii chiing vd NT 1. Giua NT 2 va NT 3 khong cfi sai khdc cfi y nghTa Ihfing ke(p> 0.05).
Qua do CO thd thay rang NT 2 vai ty Id bfi sung 20 % trim qud tuoi vao khau phdn an cho tfim nuoi Id tfit nhdt the hidn qua FCR thdp nhat. loc dg tang trufing vd trgng lugng tom liic thu hoach cao nhdt trong so cac nghiem thiic thi nghiem.
Tren co sfi nhting kdt qua dat dugc cua thi nghiem tham dfi. miic t>' Id trim que cua NT 2 dugc lua chgn dd bo tri thi nghidm chinh thirc tren quy mo toan bg ao nufii vao vu torn sau.
Kit qud theo doi cdc yiu td moi trudng iw benh trin torn nuoi
Do cdc nghidm thiic dugc bfi tri irong cimg mgt ao nuoi nen cac ydu tfi moi Vrufing la dfing nhdt. Vide theo doi. do dac cac ydu lo mfii Irufirng dugc ihuc hien lai vi tri giira cac nghiem ihiic.
Trong qua trinh nuoi, dao dgng cua cac yeu to mfii truang nhu nhiet dfi. pH.
DO. dp kidm. do man, do trong, ammonia tJii mfit .sfi thfii diem co mfit sfi ehi lieu vugt nguong. tuy nhien hau hel Id on dinh, nam trong khoang cho phep {dir liiu khdng trinh bdy).
Kit qud theo ddi binh trin torn nuoi Ildng ngay theo doi chat che edc chi tieu phan anh tinh trang sire khoe cua tom nuoi nhu: miic do tidu thu thirc an, mau sac, cac tlidn lugng dong rong, phong duoi.
mfin duoi. dut rau. phdn trang, duong rupl.
khoi gan tuy. tap tinh sfing ciia lfim...
1, 2, 3 khfing cfi ddu hidu bdnh. dufing rugt day, phdn chat, nhin chung tfim tang truoTig tot.
Dfii voi nghidm thiic doi chiing (NT 4). lii thang nuoi thir 3 mgt vai ca the tfim CO dau hidu duong rugt bi dut doan, phdn khong chat. Tir thang nufii thii 4 kdt qua kiem tra cho thay duong mgt torn van bi dirt doan, phdn khong chat vd cfi hidn tugng dirt rdu. tfic do sinh trufing cua tfim fi nghiem ihiic 4 vdo khoang thoi gian cufii chu ky nuoi cham hon so voi cac nghiem thiic 1.2.3.
Tir ket qud theo doi didn bidn benh trdn tfim nuoi cfi the thay rang vide bfi sung trim que vao khau phdn an cfi tdc dung kich thich torn bat mfii, lang siic de khang cua lfim dfii vfii cdc benh do vi khudn vd tang hieu qud sii dgng thiic dn cua tom nufii.Ty le NT 2 dugc diing cho thi nghidm chinh thiic.
Ket qua thi nghiam chinh thfrc Thi nghiem chinh thiic dugc bat dau thuc hidn tir ngdy 15/04/2008 • * 12.'08/2008.
Sfi lieu trinh bay trong bdng la gia tri trung binh ± SD.
Tdc do tdng trudmg, hipu qud su"
dung thirc dn vd ti fi song
Tir ngay nufii thii 30 bat dau kiem tra sinh trufing cua tfim nuoi theo dinh ky 15 ngdy/ Ian; tir ngay nuoi Ihii 61 den khi thu hogch thuc hidn kidm tra sinh truomg dinh ky 10 ngdy/ ldn. Kdt qua tdng trufing vd chidu dai va trgng lugng than ciia lom nufii dugc thd hidn qua bidu dfi 3.3 vd 3,4.
TAP CHl KHOA HOC SO 5 (23) 2011
Bl^u do 2. Bilu do ling trirong vl chilli dai va tr^ng Iirong than cua 2 nghiein thnc
T,1nB«,M,.p hL-,. mm, Ig,.,^ B i , *,;„ ,&. 2 N T ^
jT" ^-
X "-^
r^ /
/ ^
y y• ^ j < ^ \~—^ .-<
l^--",'»i
Bang 4. Tdc do tang trirmig, ty 1^ s^ng, he so chuyen hoa thfrc an
Nghifm thiie Trong lirgng lom 30 Trong Itrgrng torn thu D W G ngay tuoi (g) hoach (g) (g/ngay)
SR
(%)
NTl DC
20,8 16.9
0.2 0.15
90.8 91,3
1.38 1.69
Theo bidu do 2 vd bang 2 cfi thd thay rang loc do tdng trufing cua tfim nuoi lai ao thi nghidm (cfi t)' le tnm quS trong khdu phdn thiic dn Id 20 %) cfi tfic dg sinh Vruomg nhanh hon so vfii ao dfii chirng (chi su dung hoan toan thirc dn cong nghiep). Doi vfii chi lidu tang irufing vd trgng lugng than, ao ihi nghiem co tfic do lang trufing cao hom, dac bidt la til ngay nufii thii 45 tro di. NT 1 cho kdl qud ve tfic dfi ldng guong, ugng Iugng tom thu hoach vd he so chu) dn bien thue an tfit hon so vfii 16 doi chiing.
Ket qud tbeo doi iligc le tai ao nuoi cung cho thay, dfii voi ao thi nghidm. khi phoi gfin trim que vdo thuc an cong nghidp cho tom dn thi co tac dung kich thich klid ndng bdi mfii, did hidn qua thfii gian torn an het thirc dn trong nhd nhanh hon so voi ao dfii chiing, Dieu nay co y nghTa quan irpng trong vi^c giup Iam giam he so chuydn dfii thiic an (FCR) do gidm Iugng thirc dn bj Ihdt thoai ra mfii uuQTig trong qua trinh tom an moi.
Ket qua theo ddi cdc yeu to mdi trudng vd benh trin torn nuoi
Cdc yiu td mdi tnr&ng
Trong qua lrinh nuoi. dao dgng cua cac ydu tfi moi truotig nhu nhidt dfi. pH,
DO, dg kidm. do mdn, dfi trong. ammonia cua 2 ao nufii khfing cfi su khac bi^i ddng kd. tai mgt so thai diem co mfit sfi chi lieu vugt ngufing. tuy nhien hdu het Id fin dinh.
nam trong khodng cho phep (dir lieu khdng trinh bdy).
Vd dg trong, nhan thay do irong cua ao dfii chiing giam manh ban ao thi nghidm trong nhfing ngay dau. didu ndy cfi the ao dfii chiing sii dung phdn bfin gay tdo ndn tfic do tao phdt trien manh hon so voi su dung phan iriin. Trong qua trinh nuoi quan sal thay rdng fi ao nuoi thi nghiem tfic do gay mdu nufic cham hon, tdng ddu va bdn hon so vfii ao dfii chung. d ao dfii chung sii dung phan bon ndn toe do tao phat tridn nhanh hon nhung l^i mau tan.
Tgi ao thi nghidm. hi ngdy nuoi thu- 80 trfi di thi lao trong ao phat tridn vfii mat do rat cao Idm cho dg Irong cfi xu huong lidn tuc giam. Nguydn nhdn cfi thd do ao thi nghidm dugc bo sung trim que vao khau phdn dn ciia tfim, vd day cung chinh la nguon thirc an tuai sfing co ham lugng chat dinh duo^ng kha cao.
Nhin chung do trong tai ao thi nghiem vd ao dfii chtmg cung cfi xu hirong giam ddn theo thfiri gian nufii. vi theo thai
cap mufii dinh duong cho tdo phat tridn Idm gidm do trong cua nufic ao.
Theo ddi cdc mdm binh trong ao nuoi Hdng ngdy theo dfii chdt ehd tap linh sfing cua torn, miic do tieu thu thuc an, chu ky lot xdc, su ihay dfii mau sac, cac ddu hidu bdnh ly nhu ludn tugng dong rong, den mang. phfing dufii, hoai tu phu bg, phan trdng, duang rugt, mdu sdc gan tgy...
Vfii lo thi ngbiem. trong 3 thdng ddu khong xudt hien cdc ddu hidu bdnh ly. torn sinh trufing phat trien tot. buoc sang ihdng thii 4 vfii mfit Ky Id khong ddng ke cfi xuat hi^n hi?n lugng duomg rugt ifing va cbo den khi thu ho^ch. phdt hien mgt so tfim
trfi di dd phdi hidn tom nufii co ddu hidu dirong rugt long, quan sal thay phan trong nhd khong chdt. Tii ngay nuoi thii 91 cfi hidn tugng dirt rau. hoai tii phu bfi. Tai noi xdy ra cac thuang ton tren co thd lom xuat hidn cac dom den. dau hidu cua sg mela- nin hoa. mfit phan img tg nhidn ciia co the torn chong lai sg nhiem triing. Ddy cung Id mgt trong nhung dau hieu ddc trung ciia cac bdnh vibriosis trdn tom nuoi trong mfii iruang nuoc man. lg.
Hieu qud kinh ti
TOr kdl qud thu dugc cua nghidm thiic thi nghidm va dfii chiing, chiing tfii dua ra bdng du loan gia tri kinh td nhu sau.
Bang 3. So sanh gia t r | k i n h te cua Id tht nghiem va doi chung
STT
:
2 3
6 7 K 9 10 11 12 13 14 15
Cac thong so Dien tich nuoi (m^) So ngay nuoi (ngay) Trpng luvng trung binh (gram/con) Kich cd torn thu hoach (con/kg) H? so thiic an
T> I? song Tong san Iui7ng(kg) Ndng suat (tan/ha) CU torn (VND) Tong thu (muc 7x9) (VND) Tong thijc an tieu Ifin (kg) Tong thic Sn cong nghi?p tieu tfin (kg) Tong thiic i n trun tuoi lieu t6n(20VD)(kg)
Chi phi (hike an cong n ^ i c p (mye 12x23.5004) (VND)
Chi phi ihijc an trun tuoi (mye 13x40,000d>(VND)
5,000 120 20.8 48 1,34 90,S 2.078 4.16 77,000 60,006.000 2.775 2J20
555
52,170.000
22.200.000
5,000 120 16.9 59,5 1,65 91.3 1.697 3.4 64.000 108.608.000 2,798
0
65.753,000
0
TAP CHl KHOA HOC SO 6 (23) 2011
16 17 18 19 20 21 22
Chi phi cai 130 ao Chi phi cong quan ly cham soc Chi phi nhien lieu (diu Diesel) Chi phi voi, che pham sinh hoc,...
Chi phi khac (VND)
T6ng chi phi (muc 14+15+16+17+18+19+20) (VND)
Lai (VND)
4.000,000 4.8O0.O00 9.000,000 4.000.000 2.000.000 98,170,000
$1,836,000
4,000.000 4,800,000 9.0O0.000 4,000,000 2,000,000 89,553.000 19,055,000 Ghi chu: gid logi 40 con/kg Id 85. OOOd
Vfiri cac kdt qua nghien ciiu ciia ngi dung ndy. chung la da thay dugc rdng trim quetuoi dugc sii dung vai ty' Id 20% vao Idiau phdn an hdng ngay vd phan trun gay mau nufic (I5kg/I000m') da co tac dung tfit cho nufii lom su. voi cac kdl qua nhu lang trufifng tfit. tfim khoe mgnh. gidm he so chuyen boa thuc dn, g^' tdo tfit, mdu nufic ben han....
vd cfi hidu qua kinli t£ cao hon, lgi nhudn dat 63% so vfii Ifi dfii chimg la 21,3%.
BAN LU^N
Sau kdt qua thi nghidm tham dfi, ty Id bo sung trim que tuai vdo khudn phan an hang ngdy ciia tfim tot nhdt Id 20%. Ty Id bo sung 20% cfi su khac bidt difing kd vd he so chuydn hfia thirc an. tfic do tang truomg va trgng lugng tom khi Ihu hoach so vai 16 dfii chimg. Ty Id nay da dugc thi nghidm thuc td tren cd ao nuoi vdo vu tom nam sau, ket hgp vai diing phdn giin dd gdy mau nufic. K.dl qud cung cho thay t>' Id bfi sung 20% cho ket qud tfit hon ve he sfi chuydn hfia thirc an. tfic do tdng trufing . trgng lugng tom va cfi hieu qud kinh Id cao hon so vfii 16 doi chiing,
Vdfi ty- Id 20%, trim xay nhuyen rfii bfi sung vdo thiic an dii lao miii tanh ciia triin tuoi vd dd kich thich tfim an tfii hon.
Nhu vdy. ngoai gid tri dinh dufing. trim co tao "mui thom". kich thich tfim an vd kdt qua la tfim phdi tridn tfit ban.
Khi su dung phan trim de gdy mau nufic. chung toi thay rang tao phdt tridn
chdm ban so vfifi diing phdn hfia hgc, qua thdng thir 2 thi mdu nufic dat vd ben ban.
mdu nufic 6 dinh vd it bidn dgng hon so voi ao doi chirng. Tuy nhidn cufii thdng thir 3 thi mdu nufic lai phdt tridn dam hon.
cfi thd do trim luai bo sung ngdy cang nhieu, dieu nay co thd da kich thich tao phdt tridn manh ban.
KET LUAN
Tfim sii CO the tieu thu nguon thirc dn la,tnin qud. Trun que dugc su dung Idm thiic an nuoi torn hieu qud nhat khi dugc phoi trgn voi thiic an theo ^ Id 20%. Phan trun cfi tac dung gdy mau nufi-c cho ao nufii.
TAI LIEU THAM KHAO 1. 28 TCN 171:2001. Ouy trinh cong
nghd nufii thdm canh torn su.
2. Nguyen Van Bay, (2004). Hudng ddn ky thudt nudi triin ddt. NXB Nfing Nghiep, TP.HCM.
3. Nguyen Diic Qu^'nh Tram, vd cs, (2007), Anh huang cua viic thay the cd tgp bdng giun que lin tang trudng vd ti li sdng cua cd tren lai Tap chi thuy sdn 4.
4. Pham Thj Bich Tram, vd cs. (2008).
Nghien ciru cdc yeu td dnh hudng din hiiu sudi tao dam annn cua qud trinh tu phdn gidi triin qui, Nfing nghiep va phdt U'idn nong thfin 4, pp.
5. Phan Thi Bich Tram, va cs. (2009).
Ung dung bdt dgm thuy phdn tir trim
CN. Tuydn tap hgi ngh| cfing nghd sinh bgc todn qufic khu vuc phia nam, pp.793-798.
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, Chanratchakool P. et a!.. Qudn ly sdx^
khoe tdm trong ao nudi, (2003), Hgp phan hfi trg nuoi trfing thiiy sdn bidn vd nuac Ig. DANIA - Bg Thuy Sdn Philip S. Cruz., (2007), Aquaculture Feed and Fertilizer Resource Atlas
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qui a Ba Tri, (2006), Website:
h t t p : / / w w w . v i e l l i n h . v n / d b a s e / LVCNNShowConlent.asp?ID=690 11. Huynh Van Vu- TTKNKN Phu
Yen, (2010), Ky thudt phdng tri benh phdn trdng tren ldm nudi Website: http;//www.
k h u y e n n o n g v n . g o v . v n / e - k h c n / phu-yen-ky-lhuat-phong-tri-benh- p han-trang-tren-to m-nuoi/view