Note Daily growth and length-weight relationship of Lates calcq-ifer ...

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