s7i:zz:BenZzT"'"'''-''''''""^

Tap chi Khoa hoc - Cong nfhe Thiiv „

T H O N G B A O K H O A H O C

. KET QUA NGHIEN CUU THlJ NGHIEM NGlT CU KHAI THAC MU^C BANG CAU VANG d TiNH B £ N TRE

^ THE RESULTS OFEXPERIMEmAL RESE.4RCHSOLID FlSHI^G GEAR BYLONGLINE ' INBENTREPROViyCE

1 Hoing Van Tini,', Nguyin m,n-Sm', Plicn Nliat Tiianh' Ngiy nhlBbi: 25/3/2015. Ngi,pta bito « „ , , , , . . 15,720.5; Ngi,-duyS d l . . 15 p ^ o n

r. T 6 M TAT

• ' • ' /•.^'''""S*"»""""*«Apy„„*„i„g™«.M.'™8. ICil^uaneiiiinciciaciiinigto collieiplL

;, ngh'. can vang lihai ,Mc mm vio nghe ca linli Bin Tre ^ . Ti, Idioa: Thii nghiem. ciu ving khai thac mm. unh Bin Tre

ABSTRACT

; 7i« .My results designed a longline s,uidfishmg ba.sed the models gear ii, Kien Giang and Ca Mau c L Z Z Z T : T . T * ' ' . ' " -i'h^^'P^rson/fishing ,„,. , „ , „ „ , , ,„ , , , „ L , L ^

s7i:zz:BenZzT"'"'''-''''''""^

Keywonls: Experiment. Squid Longime. Ben Tre province

I. DAT VAN o 6 .,k-

H^n Tro 14 „ " . . . ^ - ^ ^ ""'^ 9 ^ " ^"1 ' ^ ^ " ^ U " " / C Sip d U n q i»J,4st,v/Tau, g i p 4 lan so vm ca nuac [1J. bien) [11

c6 llnh * f r ' " " " " • " " ' """"^ ™ " " "9l.6n toi muc chiim 70,3% cua ca n u i c c6 tlnh chpn luc nhu cau, luCTi vav b j v il nhat n i „ h h • ,,•. . " ' - " " ' ^ ""^"o.

thin. So tau n g h i cau chilm »T» 3 52% , 1 ' H - " " ' " " " ^ " ' " " " = ' " ' ' " = ' '*"""

a cua f n h , l . 6 i vay: 2 1 % t i t ^ 9 % m 1 T - ™ ^ ' " " ' " " " " " " * ' « " i ' y. A H A , Day. .^,9/0 [11. khai lhac xa bo. han c h l cac nghi khai thac ' TS. HoAng Van Tmh- Vi^n Khoa hpc va C6no nohp Kh=. H,^ ,h • - ..

; T ^ . Nguyjn N h . S ^ : PhSn » A h * h ^ h S h " " a t ' ""-^"""O « » " « " h . T , . „ ,

• KS. Ph.h NhS, T>u,„h Oh, cgc K h . mSc . 3 BSo . ^ h ^ ^ X sac BSo Tr,

TOUONG D A I H O C N H A T R A N G . 6 9

Tap chi Khoa hoc - Cong nghe Thuy sdn So 4/2015 viing bien ven bo, anh hu'ong d^n moi tnfong

va nguon loi thuy san.

Myc la loai hai san co gia tri xuat khiu cao va tieu thu npi i3ia manh, co t h l khai thac bang nhieu loai ngu" cy nhu' lu-oi keo, cau, biy, lu'oi re. Nghi ca tlnh Ben Tre chu'a si> dung cau vang khai thac myc va chu'a co m6t nghien CLPU khoa hpc ho^n chinh n^o dup'c cong b6 v l nghe cau vang khai thac myc 6 nu'o'c ta.

TIP nhifng phan tich tren, chiing toi thyc hi$n d l tai "Nghien ciru thi> nghi§m ngu cy khai thac myc b^ng c^u vang" a tinh Ben Tre Myc tieu cua nghien CLPU nham xay dung m i u v^ng cau khai th^c myc co hipu qua de ung dung cho nghe ca tinh Ben Tre.

II. D6\ T U O N G , PHl/CyNG PHAP NGHIEN CtFU 1. Doi tu-ffng nghien ci>u: Nghi cau v^ng khai thac myc

2. Phiro-ng phap nghien CIPU

- Tinh to^n, thiet k l ngu cy theo phuong phap tuang ty: dieu tra 20 ngu cy mau c6 cong suit may chinh tip 50 - 300CV a 2 tinh Kien Giang vS C^ Mau vot cdc npi dung nghiSn CLPU:

tau thuyen, trang thiet bi; ngu cy; ky thu^t khai thac; san luong khai thac, miia vy khai thdc

Phdn tich, chpn ngu cy m i u thilt ke tip 20 m i u ngu cy dieu tra, Phan tich uu nhu^c diem ngtp cy m i u thilt ke. Tinh todn ngu cy m6'i.

Cdc bilu thLPC tinh todn SLP dung tip ly thuylt thilt k l ngucy [1]:

T = ^{OAG + R) r = P = n* T

S = L 1 + 3 4G,-

(1);

(2);

(3) 0 day: P^ la dp b i n dut, T la lyc cang; n Id h$ so an toan; G la trpng lup'ng trong khong khi; L la ddy cung; S la dp ddi cung; f la dp vong. G^ lyc chim; R la lyc cdn, tinh theo bieu thLPC (4) va (5):

G, = G'q (4); R = C , - ^ F (5)

0 ddy: G Id trpng iLpgmg trong khflng fchi cua vgt; q Id xuat t ^ i m ; C, Id h§ s6 lyc c3n; VI4 toc dp; p la m$t dp nud'c biln; F Id di^n tfch.

So sanh lyc cang I6>n nhat ddy cdu phdl chiu vdi dp b i n dipt \jM ti§u chuin [1];

Sgi don PA, s6 hiSu 100. duong kinh d = 1.1mm, [PJ = 25KG:

Sp'i don PA, s6 hi^u 80, duong kfnh d = 0.9mm, [PJ =19KG;

Sp'i don PA, so hi^u 50, dud'ng kfnh d = 0.55mm, [PJ = 7,5KG.

- Thi cong, l i p rap hodn chinh ngu cg mdi.

- Thu nghi&m ngu cy thiet ke [1]:

+ Tdu thu nghi§m: tdu cd vd g6 c6 s6 dfing ky BT - 92340 - TS, c6ng suit mdy chinh:

150CV.

Mdy moc vd thiet bi phyc vy khai thdc- hdng hai c6: may phy (cong suit 15CV), thuyen thung, mdy i^nh vj; do sdu; do ca; thflng tin lifin Igc t i m xa, t i m gan; la bdn tip.

+ Ngu cy: Vdng cdu co 1000 dSy thfio (1000 ruong cdu), trong do:

' 500 ddy theo trang bj 3 khoa xoay/1 ddy thdo tgi 3 dilm lien kit: day ganh, ddy thfio tren, ddy triSn; day chi voi ddy th^o du6i; ddy theo duoi v6'i rub'ng cdu (De tdi gpi Id cdu thi^

k l (TK).

' 500 day theo trang bj 1 kh6a xoay/1 dSy theo tgi diem hen k i t ddy chl vol day th6o difdi { D l tai gpi Id cdu d l i chung (DC).

Cdc thong so ky thugt khdc v l ngu cy cua cflu thiet k l (TK) va cdu doi chung (DC) gilng nhau.

Thoi gian thu nghiam: Chuyin biln 1:

Tip 15/5/2013 - 14/6/2013; Chuyin biln 2:

Tip 8/8/2013 - 5/9/2013; Chuyin biln 3: Tip 15/9/2013-17/10/2013.

- Viing bien thi> nghigm: viing biln Nam Bp, cung ngu t r u i n g v6i nghi cdu myc kit hp'p anh sdng.

- Thu thgp so li#u thip nghi$m: Sdn ph&n cua cau thilt k l (TK) vd cdu d l i ch(>ng (DC) dugc d l rieng va ghi ch6p vdo philu (Slu tra.

XLP ly s l li^u theo phuong phdp Wiing kd mfl ta bdng phin m l m todn hpc Excel. Cdc s l lifri thu thdp vd cdch tinh [1]:

70 . TiJUONG DAI HOC NHA TRANG

TsBShi^oa hoc - Cong nghi Thiiv son

Sd 4/2015

Toc do troi cau: Tinh theo bilu thl/c:

V = jT (6) Trong do: V Id too dp troi cau (hl/h); T la thoi gian troi cau (h): S la quang dirt'ng tau dl dugc trong Ihoi gian T (hi), xac djnh dira vao may ^ n h vj).

San lu^ng khai thac (Q) cua chuyin bien du.(rc x i c ffinh l<hi b i n san phim, l i long san luyng thu dirac cua cac m i c i u trong chuyen bien, tinh theo bleu thi>c (7) [1];

Q- i;&- (7).

Trong do: Q , . Q „ + £ ] g j , . (8) q la sin lu<(mg ala me cau thl> i (kg), bao gom san lu^ng Ihu dm^c khi tham c i u va thu cau.

Q„ l i s i n lirang mirc thu diroc khi thu c i u cOa m i c i u thi> i; Q ^ l i s i n lirong mirc thu diroc cua lan t h i m cau thir m cua me cau thir i; z l i s6 Ian t h i m cau cua me cau thir i.

Ning suat khai thic: la san lu.ong khai thac aia 100 nrong cau (kg/100), tlnh theo bilu thi>c (9) [1].

(10).

CPUE . IOO ^

Trong dO: CPUE, l i n i n g suit khai thac ciia me c i u thir 1; E, l i s6 nrerng cau diroc tha ciia me c i u thir i. Ning suit khai thac tnjng binh cua chuyin biln tt'nh theo bilu thiJc (10).

v$tlf$u Day triin

_ , ^ ' ^ ngu* cy mau thiet ke the hie Bang 1. Thong so ky Ihuat d i y cau ngir cu m j u t h i l t k l

c P U i : „ . 1 0 0 - ^

n* E

Trong do: CPUE„ la nang suit khai thic trung binh cua chuyin biln: n la so me c i u khai thac cua chuyin bien; E la s6 nrong cau du'oc t h i trong m l i me.

Hieu qua kinh t l : Xac dinh 3 dai loong g i m doanh thu (DT), chi phi (CP) v i loi nhuin (LN) ciia chuyin biln [1].

* Doanh thu chuyin bien: la tong so t i l n thu diroc tir ban s i n pham cua chuyin biln.

D T - Q . p (11, Trong do: p la gia ban mot don vj san pham

• Chi phi chuyin biln: g i m chi phi nhien lieu, nuwc d i , thirc pham, vat to bo sung cho ving cau, miy moc trong chuyen bien.

CP = CP, t CPj + CP, + CP, (12) (CP,, CPj, CP,, CP, l l n loot l i chi phi nhien lieu, nooc d i , thirc pham, vat to bo sung cua chuyin biln).

' Loi nhuin chuyen bien- LN = D T - C P (13) III. KfiT QUA NGHlfiN CI>U VA T H A O LUAN 1. K i t q u i tinh toan, thiet ke

1.1. Cac thong s6 ngu cu miu tiii4t Ite 1.1 1. D i y c i u : Thong so ky thuat cua day cau ngo cu m i u thiet ke the hien 6 bang 1 [1J.

dtmm) 1,1 12.000

m/kg

Day Iheo tren V$l lifu 625 PA

d tmm) 0,9

L(m) m/kg

D3y theo dtr^i 40 950

d(mm) 0,55

m/kg , , , . . , , . J ' - I ••• 1 - - I - " I - ^ u I i-A I u,55 3 1165 Mng 2 m: " " " ™"' ^°'^'^^^'^^^^^^^l^khi^^^

Bang 2, Thong so ky thuat c i c bp phan khac ngir cu m i u t h i l t ke

1.2. Chon tdc dp trdi vang cau

T i c dp tr6i cua ngir cy m i u l i V = 1 - 1,1 hirti. Ngo cy thilt k l hogt dpng 6 viing biin Nam BO ciing ngo troong ngo cy m i u .

nen cac y i u to moi tnrcmg t i c dung len ngo cy thilt k l toong to ngo cu miu. Thoi gian khai thac cua ngo cu thilt k j nho ngo cy m i u . Doi toong khaithacchinhcuangocumiulamocia.

TRLIONG OAI HOC NHA TRANG . 71

Tap chi Khoa hoc - Cong nghe Thuy sdn

.jijM

myc ong, cung la doi tup-ng danh bat chinh cua ngu cu thilt k l .

Tip nhijng phan tich tren, chpn toc dp troi cua ngu cu thiet ke: V = 1 - 1.1 hl/h hay

V = 0,51-0,56 m/s [1].

1.3. Day cau 1.3.1. Ddy trien

a. Vat li$u va kit ciu diy: ddy trien ngu cy mSu bang sp'i don PA, co uu ^ I m : tron bong, it bi r i i , lyc can gidm, thudn Ip'l cho thao tac khi thu, tha cdu, thong dyng, de mua, gid ca hp'p ly; dp ben Ion han sp'i dan PE co ciing dp tho. T u nhung phdn tfch tren, chiing t6i chpn vdt iipu day trien ngu cy thilt ke !d sp'i don PA.

b. Chiiu dai day: chilu ddi day trien (chieu dai vdng cau) lien quan toi thoi gian thd cau, thu cdu, thdm cau, s l lup'ng ddy theo, khoang each giua 2 day tii§o, ky nang v l nghi cua thuyen vien, trinh de cong nghe cua tau, dilu kien kinh t l cua ngu dan, chilu ddi day ganh dugc tha.

Kinh phi vang cdu thilt k l dugc duy$t la 1000 day theo. Chilu ddi day ganh 6,0m, khodng each 2 ddy theo Id 13 m. Chieu ddi vang cau thilt ke la: 13.000m [1].

c. DQ thd diy: day trien ngip cu mau co du6ng kinh d = 1,1mm ( s l hipu 100). Lfng v^i toc dp V = 0,56m/s, lyx; cdng T = 0,91 KG. Luc dut:

P, = nT; lly n = 5thiP^ = 5*0,91 =4,55 K G < p j [ 1 ] . Nhu vgy, si> dgng day tridn nhu ngu cy m i u hoan todn bao ddm v l dO ben. NghTa la, dufrng kinh day tridn ngu cy m i u d = 1,1 mm Id hp'p ly. Tip phan tfch nhu tren, chiing toi chpn he so ty 10 dp tho C^ = 1.

Duong kinh day tnen ngu cy thilt k l Id:

^,k = t^m'C,= 1,1*1 = 1,1mm [1].

Lyc cdn thuy d6ng: R = 0,46 kg {R = R, + 2 f^);

Lyc cang day tnen; T = 1,05 KG Lyc cdng Ion nhat day then phai ch|u ipng vd-i hp s6 an todn n = 5 la:

'^•nwt = T*n = 5*1,05 = 5,25KG.

1.3.2. Ddy thdo

a. V^t li$u vd Ifit cau diy: ddy Uilo q ^ ngu cu m i u thilt ke ta scri don PA. Lfu dilm te;^

sip dyng sgi dan PA trong n g h i cSu vdng W dugc phan tfch 6 muc (1.3.1). Do v§y, <M^

toi SLP dung v^t li?u ddy thdo la sgi dan PA. . b. Chiiu dii diy: chilu ddi dSy thSo l i ^ quan d i n dp sau ngu truiyng tdu ddnh b i t 0 } sdu ddnh b i t cua ngu cg mdu tgi thdi d ^ nghidn ciiu tip 30 - 45m. Chilu ddi ddy thSb ngu cy m i u id 43m (day theo trdn: 40m, d ^ theo duo-i: 3m). Tip d u li^g d' bang 1. 2 M dugc dO sdu rud'ng cau chim xuing c O a , f ^

cy m i u la 41,9m. S Chiing tdi tinh toan day thdo cOa ngu cy fe

k l ung vo'i dp sau ngu tnjong 35m (diilu 0 day thdo trdn la 32m vd ddy thdo du6i Id 3m) TU

c. Bp tho diy: dp tho day thdo tren ngi m i u thilt k l : d = 0.9mm. ddy thdo dLfdt

d = 0,55mm.

Lyc cdng xuit hidn tren ddy tfilc^

ngu cg m i u ung v6i toc dp V = 0,56t T = 0,84 KG. Luc dut Id P^ = n*T: l l y n = Svfll'

P^ = 4,2 KG < [PJ = 7,5 KG. ° Nhu vdy, s u dyng day thdo nhu ngu c^

mau hodn todn bdo dam v l dO b i n . Ti> phSn tich nhu trdn, chung toi chpn hd s6 tf Id dOfl)$

c, = i[il.

Vdy: dud-ng kinh day thdo trdn c i a ngi/c^

thilt ke Id: d ^ ^ = d^„ * C„ = 0,9 * 1 = 0,9nim. :•'.

Dud'ng kinh day thdo du6i cua ngu cy tiik k l Id: d^KT = d^M * C^ = 0.55 * 1 = 0,55mm.

1.3.3. Trang bj chi

Chi ciia ngu cg mau Id vdt lipu (Pb) dgng hlnh trong (hinh 1), trpng lugng 0,14 kg/ddy thdo. K I qud phan tfch mge b chi>ng to muc t^ng bj r^' Id phil hgp. Tip phan tfch, chOng toi trang t^ cH cho ngu cu thilt k l nhu sau: chi vidn diScsSfl vdt lidu Pb, dang hinh trong (hinh 1), togng l u i ^ 0,14kg/7 vidn cho m^t ddy thdo [1].

72 • TI5L/ONG DAI HOC NHA TRANG

Jll ImshLKhoa hoc - Cong nghe Thm s.

So 4/2015

1.3.4. Rocrngcau

R o i n g cau ngo cu m i u thiet k l hinh con tam (mil gia), hieu Hai Dang, so 35, looi cau chum bang t h i p khong gi, g i n co dinh v i o m l i g i i . Dpc hai than con tom d i n g l l y phan quang va dooc bpc lop ap mong bing vat lieu tdng hop (hinh 2). Trong loong roong cau (choa tinh mieng chi) la 12 g/cii. Tir nhirng p h i n tich trin, chpn nr6ng c i u cho ngo cu thilt k l hinh con t i m , s l 36, hang Hal Dang san xuit, gan looi cau chOm bang thep khing gi (hinh 2) [IJ.

1.3.5. Khoa xoay

Ngo cu m i u thilt k l sir dyng 3 khoa xoay/1 day theo, 70% s l ngo cu m i u dieu tra cung trang bi nho t i u m i u thilt k l , 30% tau trang dieu tra trang b| 2 khoa xoay/1 d i y theo. Trang bi 3 khda xoay/1 diy theo, kinh phi ting them so voi trang bi 2 khoa xoay/1 day theo. Phan kmh phi tang thim nay i^t nho, nhung giam so co i l i diy c i u khi thu, tha v i sin luong dinh bit cao hon.

V i t lieu c h l tap khoa xoay la Inox, khong hi t i e dong cila moi tarong node bien, k i t c i u gpn nhe, gia thanh re, thong dung, dooc s i n xuat trong nooc.

To nhirng phin tich tren. chung toi chon khoa xoay cho ngo cu thiet k l bing thep khdng gi, trong loong blnh quan 10g/1 cai So loong khoa xoay trang bi trin m i t d i y theo: 3 c i i [1]

! - * * « "^

HlDli 3a. KJioa lien kit day tfaeo Iren, dSy 1.3.6. Tinh lyc c i n thiiy ding, lyc cing cua diy thio, dp sau roirng c i u chim

Sil dyng cac bilu thtrc 1, 2, 3, 5, muc II.

tlnh dooc c i c g i i trj cua R^, L, f, T cua d i y thep ngo cy thiit k l nho sau:

Lyc c i n thuy dpng: R_ = 0,063KG. Dp sau ro*ng c i u chim: L = 34,5m. D i vong f = 1 015 Lyc oing: T = 0,65 KG. Chpn hp s l an loan n

= 5, Unh dope lyc cang Ion nhit day theo chiu- T „ „ = 3,25KG < [PJ = 7,5 KG.

Kit luin: Vol d ) s i u ngo troong 35m, d6 s i u niimg cau ciia ngo cu thilt k l chim la 34,5m. NghTa l i , nhirng k i t qua tlnh t o i n tren chip nhin va dypc sir dyng d l che tao ving c i u nghien cou thip nghiim [1].

1.3.7. Phao ganh va d i y ganh

Lyc n i l phao ganh ngo cu mau thilt ke.

tir cic du' lieu a bang 2, tinh dooc lyc nir cOa phao l i Q = 1,367 KG. Dp s i u roOng c i u cila cy m i u chim xuing l i 41,9m (myc 1.3 2) chuing 16 tong lyc chim cua ngy cy m i u thilt k l phil hop lyc n i l ciia phao ganh

trien, 3b. Khoa lien ket day theo diriH vi n

Tir nhirng phin tich, chijng toi sip dung phao ganh cua ngo cy thiit ke nho sau: phao hinh try (hlnh 4), v i t lieu PVC, chieu dal L

= 300mm, chu vi Idn nhit C„,, = 260mm, chu VI be nhit C_„ = 210mm"Trong loong cua phao: G = 0,052kg Loc n i l cua phao l i Q = 1,367 KG [11.

Hinh 4. Day ganh va pbai

Day ganh: Sir dyng soi PE xe, so hipu PE700"/,j, docrng kinh d = 1,73mm, chilu d i i 8m/day.

1 3.8. Ccr den b i o hieu

Chirc nang cua co hieu l i d l quan sat, theo doi ving c i u , bao hieu cho cac tau thuyen khac tranh. C i c thong s l cua ccr: chieu cJai: 4,5m. lam bing tre ciy, bong den 1,5V

TRUCJNG OAI HOC NHA TRANG . 73

Tgp chi Khoa hgc - Cong nghe Thuy sdn

S64/2^

Phao CO bang v | t lieu (PVC), vat nang bang xi mang va cdt (trpng lup'ng 1,5 kg), la co bdng vai (hinh 5). Khoang each 2 phao co cQa ngu cy mdu thidt k l 600m, ngu cu hoat dpng an toan. TLP phan tich tren, chung toi trang bj co hidu cho ngu cu thilt k l co cac thdng s6 ky thudt nhu cg mau thilt k l , khoang each giOa 2 cd- hieu: 50 ddy thdo (650m) [1].

1.3.9. Neo du

Hinh trg, bdng vai tong hp'p, chu vi 12 m.

Ddy nhdnh co 12 day, vpt lieu PP, ddi 15m/ddy, (J) = 10mm. Ddy chinh co 1 ddy, vat lidu PP, ddi 50m 4) = 30mm [1].

2. Bdn ve, thong kd v$t tu-, thiet bj vang cdu thiet ke 2. /. Bin ve ky thuit ving ciu thiit ki [1]

HinhSiCdrMohf^u /, ndn ca: 2. Phao. 3. La cd 4. Den, 5. Vqt ngng; 6. Ddy cd

Hinfa S. Bdn ve tSng th^ vftng cSu

/ Cff bdo hieu: 2. Phao ganh; 3 Ddy ganh; 4. Bp phan lien ket; 5 Kitoa xoay tren; 6.Daytriin- 7. Ddy theo tren; 8. Khoa xoay duai, 9. Oil; 10. Ddy theo difoi; 11. Khoa xoay moc li^p; 12. Rudng cdu 74 • TRUCWG DAI HOC NHA TRANG

-l«l

Ts^chiKhoa hqc - Cong nghe. Thin, s.

S6 4/2015

2.2. Thong its val tu. thiit tti vang cau

V i t to, thilt bj ciia v i n g cau thllt k l dooc thong ke o bang 3 [1 ]:

Bang 3. Thong ke vgt tu> thilt bj vang cau

PP, (ti=10mm p p it> = 30mm

20 cay 20 vien 40 cai 20 1a 20 bdng 20 vien 01 12 day 1 1 "^ f^ay

4,5m/cay 2,5-3kg/vien 2 phao/1 CO (0,4x0,3)m

Hinh tr6n 15m/day 50m/day [ 3. Kit qud thu nghiem

3.1. San lu^ng khai thac

Bang 4, Thing ke san lu-ong khai thac 3 chuyin biln Ihir nghiem (DVT: Kg)

' . I - - . . , - I •Jm , " t a i y , u t i i t h l ° „ ' i ' * " f " Z " " "'"'*"' " " " ' ^ " 3 " - - ' " If'^'c Nen tore tilp cung tau „en biln, chung t i l thing ke san lopng tau khai thac chuyin biln 4 v i 5.

Chuyin biln thir 4 (tir 18/12/2013-22/1/2014) tau d m h h i . c s „ - • ,

... . . . , ^ . '^I'^Hdanh bat25 me, san oonq moo 2179 kn C h u y l n b l l n t h o 5 ttr5/2/2014-16/3/2014)tiudanhhit9.1m- • , ' « ' " ' " = ^ " " *9 y,o<^w I.,, lau oanh bat 24 me, san loong moc: 1834 kg

TRUONG OAI HOC NHA TBANG . 75

Tap chi Kiioa hoc - Cong nghe Thuy sdn S64/2m

Chuyin biln thCr 4, thu 5 vdng cdu co 1000 Nang suit khai thdc frung binh (CPUE^) cfla 5 ddy thdo, trang bi 3 khoa xoay/1 day thdo. chuyin biln thu dugc d b a n g 5 [1],

Bang 5. CPUE^ cua 5 chuyen bien thip nghidm (DVT; kg/100 nrong cdu/md cdu) c t i uyen

bien CPUE^

T h i H CauTN 5.396

CSu DC 4,212

-n\v2 CauTN

6,91 Cau DC

6,49

T h i f S CauTN

8,27 Cau DC

7,66 Tl»>4 C i u T K 8,72

Thi>5 CauTK 7.64 Bang 4 va bang 5 cho thdy: vang cdu si> dgng 3 khda xoay/1 ddy theo hidu qua khai ttidc cao hon su dgng 1 khda xoay/ddy theo tu 1,06 -1,28 l l n .

3.2. Hi$u qua kinh ti 3.2.1. Doanh thu

Doanh thu la tong so tidn tau thu dup'c tCp ban san pham trong chuyen bien tgi b i l n vd tgi bif.

Gia bdn myc ong bdng myc id vd gia myc bdn tai biln: 120.000 -130.000 dlng/kg; tai ttij trin R§ch Goe (Ca IVIau): 157.000 ddng/kg vd 167.000 dong/kg Doanh thu cua cac chuyin biln t h l hi#n 6 bang 6 [1].

Bang G. Doanh thu cua cdc chuyin bien Chuyen

T h i r l Tho 2 Thtr 3 Tho 4 Tho 5

San lirgng (kg)

1201 1675 1991 834 1834

Brmglti (1 OOOd/kg)

130 130 125 120 125

San iLT^ng (kg)

898

•

S o n gid (lOOOdlkg)

-

187

-

San lircmg (kg)

446

•

Don gid (lOOOdlkg)

-

157

D.Thu ItOOQ d)

156.130 217.750 248.875 320.068 229.250 3.2.2. Chl phi

Chi phi chuyin bien bao gom: nhien liiu: nooc da; thoc phim, nooc ngpt,...; v j t to b l sung cho ving c i u . Teng chi phi cua cic chuyen bien tho nghiim dope thong ke a b i n g 7 [1].

Bang 7. Chi phi cic chuyin bien (DVT: 1000 dong) Chuygn bign

T h i i l Thir 2 Thir 3 Thii 4 Thir 5

Nhien ll#u 79.376 82.376 82.377 85.000 85.000

NvtrcUd 375 375 375 405 375

Thirc phSm 18.000 20.000 22.000 25.000 25 000

vtit t i r 3.000 5.000 8.000 10.000 7.000

100.751 107.751 112.752 120.405 117.375 3.2.3. Lp'i nhuan

Lgf] nhugn cua cdc chuyen biln thu nghipm dugc thing kd a bang 8 [1].

Bang 8. Lp'i nhugn cac chuyen bien (DVT: 1000 dong) ThiF2

ciiuyen bien

109.999 Tu cac bang 6, bang 7, bang 8 cho thay:

- Cac chuyin bien thu nghipm deu co lp'i nhudn.

- Doanh thu va loi nhu|n cua chuyin biln thu 4 cao nhit, n h ^ san luong myc khai thdc

76 • TRUONG DAI HOC NHA TRANG

dup'c nhilu hon va gid bdn cao hon. Gid my«

ban tgi bd' cua chuyen b i l n 4 bang 1,2 din 1,4 l l n tren biln. Thu nhdp binh qudn cua thuyin vidn tfnh dup'c nhu sau [1]:

ISEShiKhoa hpc - Cone n^he Thuv .Vi

Bdng 9. Thu nh|p binh quan cua thuyin vien (BVT: 1000 dong/nguwi/chuyin bien) Chuyin bien

Thu nhdp

Thi>1

iV. K t T LUAN VA KI^N NGHj

K i t qua nghidn cuu da xdy dyng dugc mau vang cdu khai thac myc ung dung cho nghi ca tinh Ben Tre. K i t qua thi> nghidm 3 chuyin bien t u thang 5/2013 d i n thang 10/2013 cho thay vang cau trang bj 3 khoa xoay/1 day thdo hieu qua khai thac gap 1,06 -- 1,28 fln cdu trang bi 1 khda xoay/1 day theo.

K i t qua danh bat thi> nghidm 5 chuyin biln (til 5/2013 - 3/2014) d i u co Igi nhuan.

Thu nhpp binh qudn cua moi thuyen vien dat 8.757,6 tridu dong/nguo'i/chuyln bien, cao gap 1,9 - 2,5 ldn so voi n g h i cdu myc truyen thong SLP dyng ngudn sang cua ngu dan dia phuang.

Ket qua nghien cuu chung to ngu dan tfnh B i n Tre du khd nang t i l p thu cong nghe nghd cau vang khai thac myc va tnen khai ung dyng k i t qua nghidn cuu de tai [2] vao cac dia phuong ven biln tinh Ben Tre.

TAiLI$U THAM KHAO 1. Hoing Van Tinh va Nhom NC (20)4),

thdc mirc a tinh Bgn Tre lo cao tong kit d6 tai Nghie UBND tid, BSn Tre (2015), Quyi, dmh V/v gh, nbin kk qua nghien cm, 6i ngh? cna UBND llnh Ben Tre so 534/QB-UBND ngay 06/4/2015

cuu Ihu nghiem ngu cy cau vang kha, ighien cm, khoa hpc va cong

TRUONG OAI HOC NHA TRANG . 77