Note Daily growth and length-weight relationship of Lates calcq-ifer ...
Note Daily growth and length-weight relationship of Lates calcq-ifer ...
Note Daily growth and length-weight relationship of Lates calcq-ifer ...
- TAGS
- lates
- www.ciba.res.in
Create successful ePaper yourself
Turn your PDF publications into a flip-book with our unique Google optimized e-Paper software.
M Korlararn at al. 488<br />
larvae <strong>and</strong> ky from day one ta twenty<br />
after pwt hslehing<br />
Newly hstched seabsss larvas were<br />
obts~nad from the fish hatchery,<br />
Mutt~&bdu enperlmsntal statton <strong>of</strong><br />
Central lnctstute <strong>of</strong> Brsckrshwater<br />
Aquaculture. Chennal Larvae wsre<br />
reared mtndwr tanks <strong>of</strong>two ton capacity<br />
FRP t u b 8t a stocking density <strong>of</strong> 15<br />
larvae I htre fm up to 21 daya. Rat<strong>ifer</strong><br />
Bmchronur phcatdu waa ~ntrcduced as<br />
inlhal feed on day 2 at the rate <strong>of</strong> 5 nod<br />
ml <strong>and</strong> it waa gradually mmsad to 20<br />
non /mi on day 8. Anemlo nauph wsre<br />
lntroducrd an day 9 at the rate 2 sadml<br />
<strong>and</strong> 11 waagrsd~dl! .omased to ?O~ae<br />
mi on oa! 21 The .map wsre fed wtn<br />
Anernlo nauplll frcm dsy 1S to 21 Ra.lio<br />
denaity was gradually reduced from day<br />
10 <strong>and</strong> completely ltopped on day 15.<br />
Rattfer <strong>and</strong>drfemlo dcnalty m the larval<br />
Le Cran 11961! u an exponential form:<br />
W an Lb (11<br />
Where. W = Relght <strong>of</strong> fish, LS<br />
Length <strong>of</strong>the fioh. a = constant <strong>and</strong> k<br />
expanent~al value Whe the data IS<br />
transformed tnto logarit~mic form, a<br />
linear ralationahrp 1s obtamed for<br />
equation (1) u followa.<br />
Lag,,!W) = h ,,lai i b lol,,lL) (2)<br />
In the presentatvdy then-<strong>weight</strong><br />
sod SL - walght relationahip <strong>of</strong> the<br />
xabaas larvae are computed by using<br />
Equat~on (2). The puametere a <strong>and</strong> b af<br />
equation 2 were computed by leaat<br />
aquares method.<br />
If fish retain8 the name shape ~t<br />
grows isametrieally md <strong>length</strong> exponent<br />
'b' haa the value b-3.0. a value<br />
n~:m:l! largeroimalcr.msr -3 0<br />
rearing tanks were monitored duly <strong>and</strong> ahowa allomctnc prcwb A value leas<br />
thedsna~tywas adjusted accordingto the tnan 3 0 ihows thmr 53h oacomaa Ilzhtar<br />
requirement. Water quahty parameters 3epa:lvr a!lame:rx or peter thsn<br />
were recorded daily. Wstar exchange was three shous tnat the lt11. Oecomer<br />
done In the larval reanng tank at the hearlsr poatrtve allooetrlr 10. s<br />
rate <strong>of</strong> 20% for five days <strong>and</strong> thereafter peamar .esgth as ~t lnmaaes tc a m<br />
n was mcreaaed to SOB Tanks were Wual:un. :ti98 ksarpm?h.-au u s<br />
mildly aerated during the period <strong>of</strong> cbcu:sted elau~trcallr lor rim bl0ereo:<br />
experiment Twenty larvae were <strong>growth</strong> phaaea nccordmg to the change<br />
mlleeted from the rearing mka oa daily <strong>of</strong> the feed<br />
bsax for 21 dam. Total lend !TLi <strong>and</strong><br />
rrsnoad IPC~U, SL.fmm upoltheanoc: Mean daily mcrement on total<br />
to the o7k.n <strong>of</strong> rauoa. @ULIC.P 01the<br />
<strong>length</strong>, st<strong>and</strong>ard <strong>length</strong> <strong>and</strong> wet <strong>weight</strong><br />
lanar were rceaw.~ from dsu : to 2:<br />
<strong>of</strong> aeabsas larvae are ahown In F I 162. ~<br />
<strong>and</strong> wet wetght <strong>of</strong> the larvae was taken<br />
Logarithmic relationahip <strong>of</strong> <strong>length</strong> <strong>and</strong><br />
from day 9 to 21<br />
welght relatlonahxp <strong>of</strong>free embryo surge<br />
<strong>of</strong> larvse are shown In firms 3 & 4<br />
To study the langth-welght Mean toti <strong>length</strong> <strong>and</strong> mean st<strong>and</strong>ard<br />
relatmnsh~p Total <strong>length</strong> (TLI. St<strong>and</strong>ard <strong>length</strong> <strong>of</strong> the larvae on day one wa*<br />
<strong>length</strong> !SLl to nearest m~llirneter md measured as 1 48.0 1- <strong>and</strong> 129t0.11<br />
wesght(g!were meaaured Th16daU was mm rerpenvely On day 21, the larvae<br />
used to determrne the relatlonsh~p attuned mean total <strong>length</strong> <strong>and</strong> mean<br />
between TL <strong>and</strong> ws~ght <strong>and</strong> SL <strong>and</strong> st<strong>and</strong>ard <strong>length</strong> <strong>of</strong> 10.96~0 49mm <strong>and</strong><br />
wcight <strong>of</strong>the seabass larvas<br />
8.9110 4lmm respnnely. Ntne day old<br />
The functional relatlonshlp between seabsss larvae had mean <strong>weight</strong> ol<br />
body <strong>weight</strong> IWi <strong>and</strong> Length IL!@ven by<br />
1.44+0.11mg <strong>and</strong> further attamed the