Southeast Asian Fisheries Development Center Aquaculture Department
SEAFDEC/AQD Institutional Repository http://repository.seafdec.org.ph
Journals/Magazines Aqua Farm News
1988
Identifying shrimp fry
Aquaculture Department, Southeast Asian Fisheries Development Center
Southeast Asian Fisheries Development Center, Aquaculture Department (1988). Identifying shrimp fry. Aqua Farm News, 6(3), 1-3.
http://hdl.handle.net/10862/2691
Downloaded from http://repository.seafdec.org.ph, SEAFDEC/AQD's Institutional Repository
IDENTIFYING SHRIMP FRY
T he fry of p e n ae id sh rim p s a r e th e p o s tla rv a l o r e a r ly ju v e n ile s ta g e s of th e life c y c le . T h e re a r e four g ro u p s of sh rim p fry th a t o c c u r in sh o re w a te r s in c o n sid e ra b le ab u n d an c e . T h ese m ay be q u ick ly id e n tifie d by th e ir g e n e ra l p ig m e n ta tio n p a tte r n s (F ig. 1). The n um ber of p ig m e n t c e lls on th e six th ab d o m in al s e g m e n t (h e re c a lle d PSAS) is an im p o rta n t and e a sily a s c e r ta in e d c h a r a c te r for id e n tif ic a tio n .
F ig . 1. F r y of d if f e re n t sp e c ie s of p e n ae id sh rim p s. A. P . m onodon; B.
P. s e m is u lc a tu s ; C. P. in d ic u s/m e rg u ie n sis; D. P . jap o n ic u s g ro u p . N o te p ig m e n ta tio n p a t te r n s on body and ta il. S c a le s a re 2 m m .
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P e n a e u s m onodon fry, w h ile n o t so a b u n d a n t in n a tu r a l w a te r s , is th e m o st s o u g h t- a f te r . They a r e th e la r g e s t (1.4-3.1 mm in c a ra p a c e le n g th CL, a v e r a g e 2.6 m m ) a m o n g all sh rim p fry and c a n e a sily be picked o u t b e c a u se of th e ir d ark b ro w n -re d s tre a k a lo n g th e e n tire body form th e tip of th e in n er a n te n n u la r fla g e llu m to th e tip of th e te ls o n . The ro stru m is sle n d e r and s t r a ig h t or v e ry slig h tly c u rv e d , 0 .4 -0 .5 x CL in le n g th . PSAS is g r e a te r th a n 13, d e n se and c o n tin u o u s.
P . s e m is u lc a tu s fry a r e r e la tiv e ly s m a lle r (1 .2-3.0 mm C L, a v e ra g e 1.8 m m ), and c lo s e ly re se m b le P. m onodon fry in g e n e ra l p ig m e n ta tio n , e x c e p t th a t th e re is m id -w ay b re ak in th e p ig m e n ta tio n of th e te lso n and th e uropods.
T he ro s tr u m is u p tilte d , 0 .5-0 .8 x CL in le n g th . PSAS is from 6 to 12.
P . in d ic u s/P . la tis u lc a t u s fry a lso re se m b le P. m onodon fry in h av in g th e c o n tin u o u s lo n g itu d in a l s tre a k or d a rk -b ro w n or d u ll-g re e n c h ro m a to p h o re s.
T hey a r e r e la tiv e ly s h o rte r (1 .2 -3 .0 mm C L, a v e ra g e 2.0 mm) b ut s to u te r . The ro s tru m is s h o rt, 0 .2 -0 .3 x CL le n g th , n o t re a c h in g th e tip of th e e y e .
R e la tiv e ab u n d a n c e of th e s e four g ro u p s in sh o re w a te r s m ay d iffe r in p la c e and tim e . In Ilo ilo , P h ilip p in e s th e rank of ab u n d an c e w as found to be:
P . in d ic u s /P . m e rg u ie n sis (65% ), P . ja p o n ic u s /P la tis u lc a tu s (18.5% ), P. s e m is u lc a tu s (11% ), and P. m onodon (5.5% ).
C a tc h e s d u rin g fry c o lle c tio n in c lu d e o th e r c r u s ta c e a n s la r v a e t h a t m ay be m ista k e n for p e n a e id sh rim p la rv a e , such as th e m e ta p e n a e id sh rim p s, c a rid e a n sh rim p s, m y sid s, and th e s e rg e s tid sh rim p s (e.g . L u c ife r and A c e te s) (F ig . 2). O th e r sp e c ie s a re e a s ily d istin g u ish e d , e .g ., c ra b z o la and m e g a lo p a , and m a n tis sh rim p (F ig. 2).
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F ig. 2. L a rv a e of o th e r c r u s ta c e a n s th a t c o -o c c u r and m ay be m ista k e n for p e n ae id sh rim p fry .
S o u rc e : B a g a rin a o TU , S olis NB, Vil la v e r WR, V illa lu z AC. 1986.
Im p o rta n t F ish and Shrim p F ry in P h ilip p in e C o a s ta l W a te rs:
Id e n tif ic a tio n , C o lle c tio n , and H an d lin g. A q u a c u ltu re E x te n sio n M anual No. 10, SEA FD EC A q u a c u ltu re D e p a rtm e n t, T ig b a u an , Ilo ilo .
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