KHOA H p c CONG NGHE
THAIVH PHAIM L U A M TRUIMG TROIMG CAC A O IMUOI THLIY 5AIM D O C T H E O TUYEIM SOIMG H A U
LS Hoing ¥ 0 1 ^ Hiia Nggc Antf, Vu Ngpc tlt' T6MTAT
Bai bao trinh bay ket qua nghien cuu ve thanh ph4n loai. su phan bd cua luan Uung (Rotifera) trong cac ao nuoi c& dpc theo song Hau va tir do xac dinh mat do. kich thuoc cua luan tning trong tu nhi^n de phuc V14 cho vi?c cung cap nguon thiic an tii nhien trong siui xuat ca gi6ng theo hirong da dang hoa loai nuoi, tang ti 1? irong gidng thiiy san b dong bang song Ciiu Long. Thai gian thuc hien tu thang 3 dtin thang 6 nSm 2018 tren 19 ao uong ca. bao gom cac ao nuoi ca dpc tren luyen song Hau. MAu dinh tinh va djnh lupng dong v^l phi^u sinh dupc thu 2 dot thu miu trong ao. Dot 1 tu luc tha ca d^n 15 ngay va dpt 2 lir tnroc 15 ngay thu hoach. K^t qua xac dinh dupc 45 loai luan triing. trong do giong Brachionus chi^m uu th^ nhal ta 10 loai (22%). Kerateila 7 loai (16%), Finilia 4 loai (9%). Polyarthra 3 loai (7%). Trichpcerca 2 loai (4%) va cac loai con lai CO 1 loai (2%). ThAnh ph^n loai trong cac ao thu mSu co so loai luan trung dao dyng tii 7-23 loai. trong do loai Brachionus rubens c\\\^m uu th^ nhat voi kich co-chieu dai 196+31 pm va chiC'u rong la 148±7 pin. Mat dp dpng vat phieu sinh trong tat ca cac ao thu mau dao dpng tir 340.615~1.952.440 ca Ihe/m-'. Chi sd da d^ng Shanon-Wiener ciia cac an Ihu miu qua 2 dot khao sat dao dpng 0,15-0.29.
Tir kh6a: Ao nudi Pdng thiiy san, Brachionus rubens. sdng Hau. Rotifera.
1.GI0ITHEU
Nuoi trong thuy san la mot U-ong nhirng nganh kinh te chu luc ciia Viet Nam, dac biet la d6ng bang song CiJu Long. Tuy nhien van de bien doi khi hau dang tac dpng manh me den nghe nuoi trong thuy san 0 Vi^t Nam noi chung va d6ng bkig song Cuu Long noi ri^ng. Dac bi6t la viec thay doi moi tnrong da va dang anh huong trirc tiep dcrn linh vuc san xuSt gidng cac loai thuy san. Chinh vi vay, cac bien phap din?c dat ra nham thich ung voi viec bie^n ddi khi hau (lang la mot nhu cdu thuc su can thidt va cap bach.
B^n canh viec thich ung, nhu cau cho su phal trien cua nganh nuoi ti'dng thiiy san thi khau san xuat gidng ddng gdp mot vai ti'd rM quan h-gng va chinh yeu cua nganh nudi ti'dng tliuy san. Vi vay. trong giai doan hi^n nay viec tim ra cac loai thiic an tu nhien cd th^ nudi sinli khdi d6 dang h'ong thdi gian ngan, cd kich thudc phii hop va mang nhieu gia tri dinh duong nham nang cao hieu qua trong san xuat gidng, dac biet la cac ddi tuong cd gia tri kinh t^ cao la rii can thi^t. Ddng vat phieu sinh la nhtmg ddng vat sdng troi ndi va cd kJia nang bm kem, cd kich thudc nhd, don bao hoac dang da bao. Vdi su phong phii va da
' Khoa Thiiy san, Trudng Dai hoc C5n Tha
• Khoa Nong nghiep. Tnrcmg Dai hpc Bac Lieu 'Sinh vien Khoa Thtiy san, Trudng Dai hpc Can Tho Email: [email protected]
NONGNGHIEPVA PHAT TRIEN NONG THON - KY 1 -THANG 10/2019
dang trong cot nude, chiing ddng vai trd quan trgng trong su van chuydn nang lugng tir cac sinh v$t san xuat (tao, rong,...) ddn cac bac dinh duong cao hon h-ong he sinh thai nhu ca, tdm kich thudc lon va dac biet la d- giai doan au triing. Theo nhi^u nghidn cuu trudc day thi nganh luan trimg (Rotifera) cd vai trd quan ti'gng trong viec lam thiic an tu nhien cho nghe nudi va san xuat gidng thuy san. Luan triing phan bd b rat nhidu he sinh thai khac nhau nhu kenh. rach, sdng. rudng liia, ao tu nhien... Luan trung thupc nganh Rotifera hien dien hen 2000 loai ti'ong dd cd 95% phan bd trong mdi ti-dng nude nggt. Chiing la loai cd kich thuoc nhd, dao ddng trong khoang 50-200 |im. la thanh phan quan ti'gng trong quin xa ddng vat phii du d cac loai hinh thuy vuc nude nggt (Va Nggc lit, 2013). Tuy nhien, vai trd cua chung ti-ong cac ao nuoi, uong duong ca chua duoc tim hieu nen can phai xac dinh ro de cd nhung bien phap, phuong an cu the nham nang cao h le sdng, chat iuong ca uong ti'ong ao. Chinh vi tAm quan trong ciia chung nen \iec nghien ciiu, tim hieu ve su da dang, mat dd ciing nhu kich thudc cua chung ti-ong cac ao nuoi ca dugc thuc hien.
2. PHUONG PHAP NGHBU CUU
Nghien cihi duoc thuc hien vdi 2 dot thu mau ti-ong 19 ao nudi ca doc tiiydn sdng Hau. Dot 1 la sau khi tha ca 15 ngay va dot 2 la trudc 15 ngay thu hoach. Cac ydu td mdi trudng nude ao nudi nhu nhicl SI
KHOA HOC CCn>
d p , p H . a t r o n g . D O , C O D . BODs, l^^"^- T D S . N O . . I't >i . Chlorophvll-a cimg d i n x d a n h gia x e m miji: d o p h u h o p t r o n g u o n g . nuoi c a . Mau dinh linh va dinh l u p n g d p n g vat p h i e u s m h d u o c Ihu b a n g luoi p h i e u s m h Vin kich thinxr m a t luoi 6 0 \im. d6i vm m i u d i n h l u p n g thi tai m6i a o thu 100 bt n u o c va d u p c lpc q u a Iiroi. CO d m h m a u va c h u y d n vc P h o n g Thi n g h i e m . Bp m o n Thiiy sinh h p c u n g d u n g . Khoa Thiiy s a n , T i v o n g Dai h p c Can T h o i i p h a n tich. D m h d a n h ten cac g i d n g loai d o n g vat n6i t h e o Shirota (19*36).
T r o n g q u a trinh d m h tinh tan suat xuat hifn ciia c a c g i d n g loai d u p c g h i n h a n t h e o t h a n g ciia Sche£fer va Robinson (1939) la k h i lon h o n (M la nhi^u ( + ~ ) : 30-fjO* la vua (++) va n h o h o n 30% la it (+). D m h l u p n g d p n g vat noi b a n g b u o n g d d m Segewick Rafter. Xac d m h so l u p n g Ioai tren kinh hien vi 6 v;it kinh lltX Mail d u p c d e m 2 lan voi t d n g c p n g 156 o ngau nhien. Kich thuoc cua c a c n h d m luan t r u n g s e du^ic X.-1C dinh t r o n g qua Uinh p h a n tich dinh tinh.
Kich t h u d c t r u n g binh ciia mdi loai luan UTJng t r o n g a o nudi s e d u o c do duoi kinh hidn vi b a n g trac vi thi kinh, do chieu n g a n g va dai cua ca thd. mdi loai vdi sd l u p n g la 30 ca t h e . N.iioai ra. n g h i e n cim cdn sii ditng chi sd da d a n g S h a n n o n - W i e n e r (HO d e x a c djnh s u da d a n g vd t h a n h p h a n loai cOa luan t n i n g d cac a o thu m a u .
H ' . -Ipi.lnpi
T r o n g dd: p, = n / N : n,: sd l u p n g ca t h e ciia loai
_ B a n £ l . Sd h i p n g c a c a o thu m.iu o i r o n i r c a So liiiin.c 1'' chdm
m a u
C a trd, ca dieu h d n g , ca lh.ll lal. ca c h e p
D o c t u y e n s o n g tir Can T h a d d n An G i a n g
t h i i i .
B a n g 2. C^ ydu to m d i
C a c h . i c h . c a l a n . g . c a h u 3 . KET QUA VA D U O LUAN 3 . 1 . C i c y d u td m d i trtiemg
Ket q u a p h a n tich c h a t l u p n g niroc t r o n g c a c ao t h u m a u d d u phii h p p c h o sir p h a t t r i e n ciia n h d m d d n g vat phidu s i n h va c a n u d i t r o n g a o . Gia tri pH d a o d d n g tir 6.0-7.3 n a m t i o n g gidi h a n c h o p h e p 6.0-8.5 c u a Q C V N 0 8 - M T : 2 0 1 5 / B T N M T , c d t A l Gia tri oxy h d a tan (DO) d a o d d n g 4 , 5 - 6 , 5 m g / l . t h a p h o n so vdi Q C V N . t h a p n h d t la 4,5 rag/1 a a o ca that lat va c a o n h a t 6,5 m g / l d- a o ca trd. t u y n h i d n v i n p h u h o p c h o sir p h a t t n e n c u a ca n u d i t r o n g ao. H a m l u p n g c h a t h i m c o ( t h e h i e n q u a n h u c a u oxy hda h p c - C O D ) c a o h o n s o vdi Q C V N . h a m l u p n g C O D c a o n h a t la 20.1 m g / L d- ao ca didu h d n g . H a m lirpng nitrite a ao ca c h e p , c a didu h d n g thjip h o n s o vdi QCVN la 0,05 m g / L va d a o ca tra, c a t h a t 14t. ca ldc.
ca k h a c c a o h o n s o vdi Q C V N . H a m l u p n g dinh d u d n g p h o s p h a t d a o d d n g 0 . 2 - 0 , 8 m g / L . c a o h o n so vdi Q C V N . T u y cd s u c h e n h l e c h giira c a c a o nudi s o n g c h a t l u o n g n u d e van d a m b a o c h o s u p h d t tridn ciia d d n g vat p h i e u s i n h c u n g n h u ca n u d i t r o n g ao.
t r u o n g t r o n g ao nudi c a Nhidt
dp C'C)
pH Do trong (cm)
COD ( m g / L )
B O D ; (mg/L)
DO ( m g / L )
N O ; (rag/L)
P O , ^ ( m g / L )
Chlorophyll-a ( p g / L )
TSS ( m g / L )
T D S (mg/L) 30.0 29.9±7.S l.'!.9±1.4 3.6±0.3
> . l t l . . l l 4 . 4 ± l . l C.T Ihiit lat 30.5 6.80±11. 21,0+.^.2 i I6.5±7.: 3.1±0.4 Ca dieu
hdng 31.0 7.o.^±ii.i, : s . : ± ; i '20.1+1.8 :!L0 6.9?±(1.4l:5.7±14 1] 1?.4+2.J
0.20±0.3 207±16.5 41,5±30.4 337.5±0,7 3.6±0,4 0.30±0.1 151+89,4 47.5±43.1 296.5±0.7 3.8±0.4 5.4±{i.2
I c a c h e p ' 31.4 :"..w±il,l '
0.8±0.2 I63±41.l
C.-ikhac 3J.0 6.-53±(U'Lyoti
18.7; 13f,±?.7'3.9±0.4 5,7+0.2
55.5+12.0 300,0+83.4 125+12,6 36.5+7.8 I t ' S ^ . y 3.8±0.5'5.7±().7
259.0±29.7 0.2±0.3 0.3+0.1 224.0+104.2 3.2. T h a n h p h a n loai luan triing t h a n h p h a n loai x u d t h i e n c a o n h a l Brachionus
o .1 f -n. 1 ; - , ; • I'ubeiis. B. havanaonsis, B. pala , r'^!,^ll.i v^lcra 3J.1. Thanh phan loai luan Irune Uong ao ca tia ,-, , „ ••della valga,
1-ilmia longi^cla. F. terminalis. Trichocerca Kdt q u a p h a n n c h t h a n h p h a n loiii luan t r u n g alindnca. Polyarthra s p . , Lacane hna D o c a c ao t r o n g .10 ca t m q u a 2 dpi thu m a u ,ghi n h a n dir. K l o n g m m g tlfu cd m a t d d m m g c a o k e t h«i) v.ri viec h an c p n g cd 19 10.-U t h u d c 7 gidn.i; Tron.K d,>. u - -.lal b a n g Ihiic .In cd h a m l u o n g d a m ca>, •,(.„ j j , '^ ° , ^
N O N G NGHIEP VA PHAT TRIEN N O N G THON - KY 1 - THANG
l^HOA HOC CONG NGHE ham lirgng dinh duong trong nude tich luy va tdng
Ifn. day la dieu ki^n thich hgp de cac loai luan trimg phat trien. Dieu nay phii hop vdi su phan bd cua chiing trong thiiy vuc tu nhien vi hau het chiing phan 56 trong mdi trudrng nude ngpt, chiing la nhimg sinh vjt chi thi cho mdi trudng giau dinh duong {Sladecek, 1983). Ket qua ghi nhan khdng cd su khac bi$t nhi^u trong qua hinh irong nudi do ngudi nudi phai thay nude lien tuc ke tir khi tha 5-6 ngay/lin.
BJing 3. TMnh phin loM luan tning ao cA tra Gidng
Brachionus
Kerateila
Filinia Lacane Polyarthra Trichpcerca
Elosa
Loai Biachionus lalcatus Brachionus havanaensis Brachionus pala Brachionus rubens Brachionus quadiidentata Brachionus caudatus Kerateila quadrata Kerateila stipitata Kerateila valga Kerateila cochlearis Filinia longiseta Filinia opoliensis Filinia terminalis Lacane luna Polyarthra sp Polyai'tiira vulgaris Trichocerca longiaeta Trichocerca cyUndrica Elosa woralh
D o t l + + + + + + + +
+
+ + + + + +
Dot 2 + + + + + +
+ + + + + +
+ + + + + 3.2.2. Thinh phan loii luan tning tiong ao ci tie Thanh phan loai luan triing h-ong ao ca ti'e qua 2 dpt thu mhx ghi nhan duoc tdng cpng 14 loai thupc 8 gidng. Trong dd, thanh phdn loai cao nhat la Brachionus rubens, B. quadridentata, Filinia terminalis, Trichocerca cylindrica, Polyarthra sp..
Gastropus styUfer,... So vdi ao ca ha thi thanh phan loai ciia ao ca tre thip hon.
3.2.3. Thanh phin loii luan tiimg tivng ao ci that lat va ci chep
Ket qua phan ti'ch thanh phan loai luan trimg trong ao ca that lat qua 2 dot thu miu ghi nhan dugc
tdng cgng IS loai thudc 8 gidng. Trong dd. thanh phan loai cao nhat la Brachionus rubens. B.
calyciflonis, B. quadridentata. B. Ulcatiis. Filinia temunabs. Trichocerca cyhndrica. Polyarthra sp..
Lepadella patella.... So vdi ao ca tra thi thanh phan loai luan trimg trong ao ca that lat cd sd loai tuong duong nhau.
TTianh phin loai luan triing trong ao ca chep qua 2 dot thu miu ghi nhan duoc tdng cgng cd 16 Ioai thugc 9 gidng. Trong dd, thanh phan loai cao nhit la Brachionus rubens, B. havanaensis. Lacane luna, Polyartiira sp., Xolholca acuminata,... So vdi ao ca tra thi thanh phan loai trong ao ca chep thap hon.
3.2.4. Thanh phin loii luan trung tiong ao ci didu hdng vi ca ldc
Ket qua phan hch thanh phan loai luan triing trong ao ca dieu hdng qua 2 dgt thu miu ghi nhan duoc tong cpng 23 loai thugc 12 gidng. Trong dd, thanh phin Ioai cao nhat la Brachionus rubens, Brachionus pala, Brachionus calyciflorus, Lacane luna, Polyarthra s^.. Trichocerca cylindrica, Kerateila serrulata,...Euchlanis dilatata. So vdi cac ao trong ca 2 dpt thu miu thi thanh phan loai luan triing trong ao ca di&u hdng la cao nhat, chting ia nhtmg sinh vat chi thi cho mdi trudng giau dinh duong (Sladecek, 1983). Qua khao sat thanh phin loai trong ao ca di^u hdng dpt 1 ghi nhan dupc 14 Ioai va dgt 2 la 13 Ioai, khdng cd sii khac bi^t nhieu do trong qua trinh nudi ngudi nuoi thay nude thudng xuyen.
Thanh phan loai luan triing trong ao ca ldc qua 2 dgt thu man ghi nhan dugc tdng cpng cd 18 loai thudc 10 gidng. Trong dd, thanh phin loai cao nhat la B. rubens, B. facatus, B. calyciflorus, B.
quadridentata, Polyarthra sp., Filinia terminaUs, Elosa woralh. Cephalodella auriculata, Notholca acuminata
3.2.5. Thanh phin loii luan ti'ung tiong ao ci khic
Ket qua phan tich thanh phan loai luan trimg trong ao ca khac la ao ca chach, ca lang, ci hii qua 2 dot thu mau ghi nhan dupc tdng cpng 19 loai thudc 8 gidng. Trong dd, thanh phin Ioai cao nhit la Brachionus rubens. B. facatus. B. bakeri. B.
quadridentata. Polyarthra vulgaris, Filinia terminalis, Elosa woralh, Alberiia typhylina,... So vdi ao ca tra thi thanh phin loai luan triing trong ao ca khac luong duong nhau.
NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - THANG 10/2019 83
KHOA HOC eC
C.inng
Brachionus
1 i
Kerateila
P'lnilia Polyarthra
Elosa Tnchocerca
Notholca Albertia
Bang 4. Thinh p h ^ b i n triing IjjaJ
Brachionus baken Bmchionus caudatus Brachionus havanaensis Br3chinnu< rubens Brachiunu-' Quadndem.ita Brachionus I.ilcjtus Bnichionw^ i .ih cid-irus Kcnitelb qiridnuj j Kerateila valga 1 Kerateila cocbleans
Kerateila serrulata Filinia opoliensis Filinia teniiinalis Polyartiira nilgans Polyarthra sp Elosa woralh Tili. lioct •/•( VI kingiai 'ta Notholca acuminata Albertia typhylina
c a c a o c ^ k h ^ Ca chach
+
+
+ +
+ +
+ +
+
+ +
Calang + +
+
+ + + +
_ C a h u _
+
-t-
+ +
+ + +
+
3.3. Kich thtidc luin trung
Bang S^Kich thudcnidt so loii luan trimg thu dugc I ,Tilingijinh' Tmngbinh Loai I chidu dai ' chidu rdng
! ' (pill) ' (nm)
^Hrachioinis lalcatus i 102+22 SS±2()
\lir.ichionus havanaensis 143+33 90+^9
r,.:.
Bnichionus quadndenlati 1 S,S+3y ' Br.ichHinus nihcns i ?i^)±} 1 />r.ichii>nu> p.i/.i ' 157+11 /'oh.irihi.i^p 1 l(l±"Polyarihra vulgaris U i 3 r l "
Filinia teniiinalis 11^±:^
Licaneluna [ 1 r-"
150+21 ll(l±7 l ? i ± 9 63+lU 67+10 67+''5 yu+''9 Kerateila cocbleans - 1 3 1 Kerateila valga
Ket qua ghi nhan kich thuoc irung binh cua chieu dai luan trung dao ddng lu 98±13 un, den 196±31 pm va chieu rdng Irung bmh la tu .55±I5 pm dill 150±21 imi. trong do loai Brachionus rubens la loai mi thd nhat trong cac ao tliu mau va co kich tliupc Uling binh kha thap la chidu dai do duoc la 139+31 nm va trung binh chieu rdng la l]ii^7 um S4 N O N G NGHIEP VA PHAT
Nhu vay vdi kich thudc cua mdt sd loai luan hiing tren phu hop vdi kich cd mieng ca bot va thich hop dd lara dure an ttr nhien cho san xuat gidng cac loai ddng vat thiiy san. Theo Vu Ngoc Ut (2012) kich cd mieng cua ca tra bdt trung binh 250-270 pm do dd cac loai luan trimg h-dn cd kich thirdc rat phu hop cho vide san xuat gidng ca tra hidn nay. Ngoai ra luan triing cung la ddi tugng tiem nang lam thiic an trong san xuat gidng cac loai ca cd gia tri kinh te khac nhu:
caheo. calinh....
3.4. MJt dp luta tning
Mat dd luan trung qua 2 ISn thu miu ghi nhan duoc d tat ca cac ao dao ddng 340.615-1.952.440 Qt/m'. Trong dd mat dd trung binh cao nhat d ao ca h-a la 1.208.787 ct/ms va thap nhat a ao ca khac cd mat dp la 488.390 ct/m=. Nhin chung, mat dd luan trimg qua 2 lin thu miu a cac ao dao ddng khdng nhieu. mdt phin do hau hdt cac ao ddu thay nude Uen tuc trong quit trinh uong nudi. Cac loai thudng xuat hicn la Brachionus rubens, R hkatiis, R calyciilorus. Polyarihra m.va Filima Kmimalis... Kdt qua li-cn cho Ihay mat do luan trung -„.,, ^ac ao nav
ng ngudn I hop cho kha cao do day la ao uong nudi co ^u
thuc an nhim tao ndn giau dmh duOii;,.
nhicu loai dong vat phu du phit hncir TRIEN N O N G THON
e(HOA HOC CONG NOHE
Bing 6. M$t do ludn trung dc&; ao thu miu Ao uong nudi
C a 0 3 Cati-e Ca dial lit Ca chep Ca didu hdng
aide
Cakhac
Mat dp (ct/m^
1.208.787 893.723 605.396 739.376 657.011 610.877 488.390 3.5. Chi s6 da d^ing sinh hgc
Chi sd da dang Shanon-Wiener (H') cua cac ao thu miu qua 2 lan thu miu dao ddng tir 0,15-0,29.
Tat ca cac ao thu man thi chi sd H' ciia d 0 1 va dpi 2 khdng CO sir khac biet cd y nghia didng ke {p>0,05).
Gia tri H' trung binh ghi nhan duoc qua dgt 1 va dot 2 la 0,19-0,22. Theo phan miic xep hang cua Dirong Tri Dung (2001) thi cac ao cua 2 dgt thu miu deu danh gia la bi d nhi§m. Theo Stau etal. (1970) cd the dua vao chi sd da dang sinh hpc de danh gia ch • lugng nudfc b khu vuc khao saL Qua ket qua tren cho thay su da dang smh hpc cua hiu hdt cic ao deu rit thip vi tinh trang d nhidm rit ban (H'>1). Su bien ddng chi so H' khong chi phu thupc vao sd luong loai m i cdn phu thudc rat nhidu vao mat dp ciia timg loai.
Ao ci 1 ff
Catra 0,15-0.17
Cahd 0,23-0,24
Bing 7. Chi sd da dang H'tgi ao cS Ca dieu hdng
0,19-0,21
Cafliatlat 0,17-0,25
Ca chep 0,2190,2
Caldc 0,2160,212
Ca khac 0,288 4. KET LUAN VAB^ XUAT
4 . 1 . K ^ t l u § n
K^t q u a thu d u g c cd 21 g i d n g , 45 loai luan triing xuat hidn b c a c a o t h u m i u . T r o n g d d g i o n g Brachionus c h i d m mi thd n h a t vdi 10 loai (22%), k e den la gidng Kerateila cd 7 loai (16%), Finilia cd 4 loai (t)%), Polyarthra cd 3 loai (7%), T r i c h p c e r c a cd 2 loai (4%) va c i c g i d n g c d n lai t h i p n h a t la 1 l o i i (2%).
Mgt dg luan h-iing q u a 2 l i n t h u m a u g h i n h a n dugc a tat ca c a c ao d a o d d n g tir 340.615-1.952.440 c t / m ^ trong dd m a t d o t r u n g b i n h c a o n h a t la b a o c i lra la 1.208.787 c t / m ' \
Luan triing cd k i c h t h u d c t r u n g b i n h c h i d u dai dao dpng tir 9 8 + 1 3 - 1 9 6 + 3 1 vim va c h i d u r g n g la 55±6~150+21 p m , h-ong dd loai Brachionus nibens co tin s u i t x u i t h i e n u u t h e n h i t va cd k i c h tiiudc t r u n g binh la 139±31 y m c h i e u dai va t r u n g b i n h c h i d u rdng la 110+7 p m .
Chi sd d a d a n g S h a n o n - W i e n e r ciia c a c a o t h u miu qua 2 dpt k h a o s a t d a o d g n g 0,15-0,29.
Cac ydu td m d i t r u d n g q u a k e t q u a p h a n tich d d u cd muc do t h i c h h g p c h o d d n g vat p h i e u s i n h va ca irong nudi p h a t trien.
4.2. D ^ x u i t
C i n n g h i d n c u u t h e m vd t h a n h p h a n loai luan triing d cac thiiy v u c t u n h i e n n h u s d n g c h i n h . k e n h cap va m g t so ao c h u a n bi d e n u d i , u o n g d u o n g .
N g h i e n c u u b d s u n g c a c d a c d i d m s i n h h o c , thanh p h i n d i n h d u o n g c u a m o t sd loai luan t n i n g dd
x a c d i n h d u p c loai tiem n S n g sir d u n g l i m t h u c an t u n h i e n t r o n g nuoi t r d n g t h u y s a n .
TAI LEU THAM KHAO
1. Boyd C. E and Craig S. Tucker, 1992. Water Quality and Pond Soil Analyses for Aquaculture.
Auburn University, Alabama.
2. Dang Ngoc Thanh, 1976. Thiiy sinh hpc dai cuong. Nhi xuat ban Dai hpc va Trung hgc chuyen nghiep.
3. Dang Ngoc Thanh, Thai Trin Bai va Pham Van Mien, 1980. Dinh loai ddng vat khdng xuong sdng nude ngpt Bic Viet Nam. NXB Khoa hpc va Ky thuat, Ha Noi.
4. Huynh Truang Giang, Vu Ngoc Ut, Nguydn Thanh Phuong. 2008. Bien dpng cic yeu td mdi trudng trong ao nudi ca tra (Pangasianodon hypophthahnus) tham canh d' An Giang. Tap chi Khoa hpc-Trudng Dai hgc Can Thff,sd 1.
5. Lam Trong Nghia, 2009. Su phan bd ciia triing banh xe (Rotifera) h'ong cac he sinh thai khac nhau.
Luan van tdt nghiep dai hoc. Trudng Dai hgc Can Tha 2009.
6. Nguydn Thi Kim Lien. 2014. Thanh phin ddng vat ndi tren sdng Hau (Zooplankton) doan thugc tinh Hau Giang va Sdc Trang vao miia khd. Tap chi Khoa hgc • Trudng Dai hgc Cin Tho.
7. Pham Thi Nggc Bich, 2013. Bien dong thanh phan thuc vat vi ddng vat phidu sinh tren song Hau Luan van tdt nghiep cao hoc, Khoa Thiiy san. Truong Dai hoc Cin Tha.
NONG NGHIEP VA PHAT TRiEN NONG THON - KY 1 - THANG 10/2019 85
KHOA HOC COI
.^, Tran Du^- Luong. liiili .\ghidn cuu giap xac angrulans) trong cac he sinh tliai kli.u nluiu. oa chSn cheo (Copepoda) va au trung banh xe Tluiy san. Truong D91 hoc Cin Tha.
(Rotifera) aaic thuy \-ucnam-ngot noi dia Viet .\am. IQ Shirota .V, 1966. The Plmikton of south Luan an Tien si Sinh hgc. \ii-ii Khoa hgc va Cdng \-,euiam. Fresh water and Manne phinklon. Overeea.
ngh^ Vut Nam. \ien Smh thai va Tai nguyen sinh vat Technical cooperahon agency. Japan,
(ban loan an day du). ^^ y . ^^^^ ^,^ , ^ ^ j , ^^ ^^„^. j ^ ^ trimg d^
9. Tran Suong N^'nc va \'u Ngnc I t . 2013. Dac ^^^^ ^^^ ^ \^ s^ing giai doan bgt len huong cua mdt diem phan bo luan trung nuoc ngpl (Brachionus ^^ [^^ ^^ jjudc nggt. Khoa Thiiy sin. Trudng Dai hgc
Can Thtr.
THE COMPOSITION OF ROTIFERA IN THE AQUACULTURE PONDS ALONG THE HAU RTVER Le Hoang Vu, Hua Ngoc Anh, Vu Ngoc Ut Summary
The ;iNsrss in (iivin.iiy of species composiUon. the disUibulion of Rotifera in fish ponds along Hau nver and thereby determine the density and size of Rotifera in the wild lo serve providing a variety of natural food sources in seed producUon, the direction of diversifting breeding species, increasing the suivival rate of aquaculturo in the Mekong Delta nver. The implementation period is from March to June 2018 with 19 fish ponds, includmg fish ponds along Hau nver. QualitaUve and quanUtative samples of zooplankton were collected 2 samples in ihe pond. Phase 1 from the time of slocking to 15 days and phase 2 from before 15 days of harvest. 'V\\v results identified have 45 species, which the most dominant species are Brachionus 10 specii-^ (1'2%), Kerateila 7 sr)ecies (16%). Finilia 4 species (9%), Polyarthra 3 species (7%), Trichpcerca 2
•^pities (4%) and Ihe other species have 1 species (2%). The species composition in the sampling pond has ninging from 1-Z\ species, which Brachionus nibens is the most dominant species with the length average value IS 196±31 pm and the width average value is 148+7 pm. Rotifera density in all sampling ponds ranged from 3'10,615-l,<l,'jJ..|4(i individuals/m'. The value Shanon-Wiener diversity index of ponds sampled through 2 survey periods ranged from 0.15-0.29.
Keywords: Aquaculture ponds. Brachionus rubens, Hau river, Rotifera.
Ngudi phin bi^n: PGS.TS. H6 Thanh Hai Ngiy n h ^ bii: 12/8/2019
Ngiy thdng qua phin b i ^ i 13/9/2019 Ngiy duyet dSng: 20/9/2019
86 NONG NGHIEP VA PHAT TRIEN NONG THON - KY 1 - T H A N G IQ 2
