Patterns of morphometry variability in three stocks of farmed tiger shrimp, Penaeus monodon. in indonesia and its application for selective breeding
-
PROSlDlNG
f
Hence
ge~letic
of great itnportance. Patterns of morphometric
instance, may
rough
thc
c improvc~netlt
of
Sprcifically, genetic
nur re
traits
variation.
ievels
rnorphornet~.ic
ocks,
variatton
cnvironmcntal
limized,
variatior~ ~norphometric~ r u i l
1 hence
gcnetjcally
and
by
KX
Among variety of traits, growth as ofter~tneasured in body weight, either as
total or as particular parts of' the body, due to e c o n o l ~ ~ iimportance,
c
is of
particular interest for most breeding progmms, hl crustaceans, the edible portion
of he ar~imallies in the abdominal partion, i.e. par1 of the body seized at thz
itlttrstc~ionbetweet1 the body and the carapace, is of cotn~ncrciallyirnportailt trait
that individuals with higher proportion of'tail weight are preferable. Lester ( I 983)
called this part of the body as "tail weight". Due to ilature of the trait, genetic
nppmach to improve tail weight must be conducted by sacrificing the ani~nalsand
calculating breeding value vf thr: relatives. Alternatively, it can also be approached
by lookii~g~ 1 tthe extenlo1 ~norphologicalcharacters h a t show high correlation
with the trait (Sugama et al., 1992). Several previous studies (Goswarni et al.,
1986. Hunng et al., 1990; Lester, 1983) have exatnilled lhr sut?ject in P ~ ~ ~ ~ u r r r s
nrrrglrt.n.sis P. pcwiciillt~t~rs,
P. wnnrdrntBrand P. . s ~ ~ ; ~ ~ o , vwith
! r i . svarying results.
Lu the tiger shritnp, P. n ~ o t l o l l o ~Sugaina
l,
et al. (1 992) have studied similar subject
a n d recotninendcd that the six segtne~ltdepth as grmd i~ldicatorfor the tail weight.
11 should be noted however. the satnples used by Suga~naet al (1992) were wild
stocks which the suppiy in Ihe future, due lnaillly to fishi!~g pressure, will be
litnited. In response to this si1ualio11,efforts t o produce brood stocks from Camling
practices a r t increasing. However, it is not b l a w r ~whether lhr mit which was
found to be good predictor for tail weigh1 in wild stock can be applicable when
selecting i11dividuaI su brtrd stock candidate aiming at improving tail weight froin
pt~l>ulationgrown in fanning conditious.
This paper was aimed 10 describe the patten~s and the alnoullt of
ti~orphotnetric n'ariations within and between thc three fanned stocks, and to
explore the rno~pho~rletric
traits that may serve as the best predictors for iticreasing
tail weight in selective breeding program.
MATERIL.:\S AND METHODS
Sample collection
Threc populations of fanned tigcr shrimp derived from brood stock
originaled f r n ~ nthe Aceh, Cilacap and Sumbaiva waters werc collected. The three
populations were sampled frotn semi-intensive brackish water growing ponds in
Latlgsa (East Aceh), Indramayu (West Java). and Bali for Aceh, CiIacap and
Sumhawa stocks, respectively. Although the last two stocks were riot sampled
MSP- 18'1
PROSlDlNG
f
Hence
ge~letic
of great itnportance. Patterns of morphometric
instance, may
rough
thc
c improvc~netlt
of
Sprcifically, genetic
nur re
traits
variation.
ievels
rnorphornet~.ic
ocks,
variatton
cnvironmcntal
limized,
variatior~ ~norphometric~ r u i l
1 hence
gcnetjcally
and
by
KX
Among variety of traits, growth as ofter~tneasured in body weight, either as
total or as particular parts of' the body, due to e c o n o l ~ ~ iimportance,
c
is of
particular interest for most breeding progmms, hl crustaceans, the edible portion
of he ar~imallies in the abdominal partion, i.e. par1 of the body seized at thz
itlttrstc~ionbetweet1 the body and the carapace, is of cotn~ncrciallyirnportailt trait
that individuals with higher proportion of'tail weight are preferable. Lester ( I 983)
called this part of the body as "tail weight". Due to ilature of the trait, genetic
nppmach to improve tail weight must be conducted by sacrificing the ani~nalsand
calculating breeding value vf thr: relatives. Alternatively, it can also be approached
by lookii~g~ 1 tthe extenlo1 ~norphologicalcharacters h a t show high correlation
with the trait (Sugama et al., 1992). Several previous studies (Goswarni et al.,
1986. Hunng et al., 1990; Lester, 1983) have exatnilled lhr sut?ject in P ~ ~ ~ ~ u r r r s
nrrrglrt.n.sis P. pcwiciillt~t~rs,
P. wnnrdrntBrand P. . s ~ ~ ; ~ ~ o , vwith
! r i . svarying results.
Lu the tiger shritnp, P. n ~ o t l o l l o ~Sugaina
l,
et al. (1 992) have studied similar subject
a n d recotninendcd that the six segtne~ltdepth as grmd i~ldicatorfor the tail weight.
11 should be noted however. the satnples used by Suga~naet al (1992) were wild
stocks which the suppiy in Ihe future, due lnaillly to fishi!~g pressure, will be
litnited. In response to this si1ualio11,efforts t o produce brood stocks from Camling
practices a r t increasing. However, it is not b l a w r ~whether lhr mit which was
found to be good predictor for tail weigh1 in wild stock can be applicable when
selecting i11dividuaI su brtrd stock candidate aiming at improving tail weight froin
pt~l>ulationgrown in fanning conditious.
This paper was aimed 10 describe the patten~s and the alnoullt of
ti~orphotnetric n'ariations within and between thc three fanned stocks, and to
explore the rno~pho~rletric
traits that may serve as the best predictors for iticreasing
tail weight in selective breeding program.
MATERIL.:\S AND METHODS
Sample collection
Threc populations of fanned tigcr shrimp derived from brood stock
originaled f r n ~ nthe Aceh, Cilacap and Sumbaiva waters werc collected. The three
populations were sampled frotn semi-intensive brackish water growing ponds in
Latlgsa (East Aceh), Indramayu (West Java). and Bali for Aceh, CiIacap and
Sumhawa stocks, respectively. Although the last two stocks were riot sampled
MSP- 18'1