Litopennaeus vannamei

1. Pacific White Shrimp [Litopenaeus vannamei
(Boone 1931)]

2. Life Cycle of Penaeid Shrimp
( Overview)Adult Brood Stock
(Spawning)
Eggs
Nauplius(Substages : I – VI)
Zoea (Substages : I – III)
Mysis (Substages : I – III)
Post Larvae
Juvenile
Adult

3. Characteristics of Nauplius ( I – VI)
 Nauplius I : Furcal setae 1+1, setae of
appendages non-plumose. Total length 0.28 to
0.31 mm. Duration 3-4 hours.
 Nauplius II: The total length varies from 0.31
to 0.32 mm. Furcal setae l+l. Posterodorsal
tooth absent, all setae on appendages plumose.
Duration 3-4 hours.
 Nauplius III: The total length varies from
0.31 to 0.34 mm. Furcal setae 3+3. Duration 4-
5 hours.
 Nauplius IV: The total length varies from
0.34 to 0.36 mm. Furcal setae 4+4. Duration 5-
6 hours.
 Nauplius V: The total length varies from 0.36
to 0.41 mm. Fureal selae 6+6. Duration l0-2
hours.
 Nauplius VI: The total length varies from 0.46
to 0.53 mm. Furcal setae 7+7. Body more
elongated. Carapace rudiment seen. Duration
15-24 hours.

4. Nauplius Stages View

5. Characteristics of Zoea I
 Carapace anteriorly rounded.
 Developing compound eyes covered with
carapace.
 Body divisible into 3 parts : anterior
region with 6 segmented apendages;
thorax in middle; posterior part with
unsegmented abdomen.
 Frontal organ present as rounded
protuberances.
 Telson not separated from abdomen by
movable joints., each lobe of caudal furca
with 7 setae.
 Furcal lobes of telson broad and short with
semicircular space between them.
 Duration 36-48 hours. Zoea I

6. Characteristics of Zoea II
 Presence of long ventrally bent rostrum.
 Stalked compound eyes.
 Absence of frontal organs distinguish this
substage from the previous one.
 Bifurcated supraorbital spines.
 Telson with 7 pairs of furcal setae.
 Duration 36-48 hours.

7. Characteristics of Zoea III
 Rostrum long, supraorbital simple,
not bifurcate..
 5th and 6th abdominal segments with
posterolateral spines, 6th also has a
pair of ventrolateral spines.
 Telson demarcated from 6th abdominal
segment by an articulating joint.
 Telson with 8 pairs of furcal setae.
 Duration of this substage is 36-48
hours.

8. Characteristics of Mysis I
 Larvae assumes more or less shrimp like
appearance.
 Rostrum long and curved, extending
beyond eye, devoid of rostral spines.
 Thoracic appendages are well developed.
 Abdominal segments 3-6 with
dorsomedian spines.
 Telson broader distally with a median
notch, each lobe bearing 2 lateral and 6
terminal setae.
 Minute pleopod buds on abdominal
segments.
 Duration 24-48 hours.

9. Characteristics of Mysis II
 Rostrum usually without teeth, rarely a
minute tooth may be present.
 Pleopods short and unsegmented.
 Duration 24-48 hours.

10. Characteristics of Mysis III
 Rostrum with 1 tooth in some specimen.
 Pleopods long, 2 segmented without setae.
 Duration 24-48 hours.

11. Characteristics of Post Larvae (PL 1)
 Rostrum with 1 distinct tooth.
 Pleopods setose ( bearing setae).
 Exopods shrunken, without setae.