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BREEDING BIOLOGY PENAEID SHRIMP (REP. ORGAN (APPENDIX MASKULINA ♂,…
BREEDING BIOLOGY
PENAEID SHRIMP
BROODSTOCK
ABLATION
fully matured ♀ (100g)
use cutter apparatus
♀ ovarian graded by torchlight
stage IV at day, spawn at that night
REP. ORGAN
APPENDIX MASKULINA ♂
THELYCUM ♀
PETASMA ♂
MATING
BEHAVIOUR
CLOSE THELYCA
P. vannamei
:warning: mate end of moult cycle (after ovaries matured)
:warning: around sunset
:warning:both sexes in intermoult stage
OPEN THELYCA
P. monodon
:warning: mate after ♀ moulted (while cuticle soft)
:warning: at night
:warning: between intermoult ♂ & moulted ♀
PHASE
(2) ♂ turn ventral side up & attached ♀
♂ turn up side down below ♀ and grips each other with pereopod
(3) ♂ turn perpendicular
♂ continue hold but rapidly turn perpendicular
♂ curve body around ♀ & ficks head & simultaneously
♂ arches body around ♀ & squeeze & flick his head & telson
spermatophore transfer
both separates & swim away
(1) ♀ above ♂ in parallel
♀ move around after moult (20-40cm) resting on bottom
♂ follow ♀- ♂ move below ♀- graps carapace with pereopod (20-120min)
SPAWN &
FERTILISE
SPAWN
closed
when cuticle harden in early premoult
in several min ~22.30-00.30 in night
b4 spawn, remain quiet on bottom
*preceded by swim actively
egg extruded(3-4min), pleo/pereopod scatter egg behind ♀
♀ rest again on bottom
open
external sperm mass
egg exposed by pass the sperm mass
sperm dispersed to water column at spawning time
FERTILIZATION
closed
when egg are expelled
open
occur freely in water column
takes place in space enclosed by
:<3: coxae of 3rd and 4th pereopod &
:<3: ventral setae
egg extruded from posterior directed genital opening on coxae of 3rd pereopod
VIEW
LATERAL
VENTRAL
HABITAT
Spawner
in offshore water
on sandy bottom depth 20-40m
Larvae
move to coast,
enter estuaries & mangrove
(nursery ground)
carried toward shore by
tidal current
Adolescent
migrate to deeper water
cycle start back
:!:to stimulate spawning
3/4 million egg/spawn