molting dan pertumbuhan -...

MOLTING DAN PERTUMBUHAN

DAUR HIDUP DAN REPRODUKSI

titi doc.2009

Decapoda : crab, lobster, shrimpDecapoda : crab, lobster, shrimp

Sudah mempunyai suatu sistem endokrin yg jelasSudah mempunyai suatu sistem endokrin yg jelas Organ- YOrgan- Y (kelenjar endokrin yang terdapat di(kelenjar endokrin yang terdapat di bagian kepala) menghasilkan hormon moltingbagian kepala) menghasilkan hormon molting ecdysoneecdysone

S IS TE M N E U R OS E K R E TOR I PADA TAN G K A I S IS TE M N E U R OS E K R E TOR I PADA TAN G K A I M ATAM ATA

Organ-X Organ-X : terdiri dari sel-sel neurosekretori, dan mempunyai axon yang menuju ke sinus gland (kelenjar sinus) Kelenjar Sinus tempat pelepasan hormon yang

dihasilkan oleh organ-X : * crustacean hyperglycemic hormone (CHH) * molt-inhibiting hormone (MIH)

* vitellogenesis-inhibiting hormone (VIH)* red pigment-concentrating hormone (RPCH)* pigment-dispersing hormone (PDH) * Pelepasan hormon distimulasi oleh sel-sel

neurosekretori dan dipengaruhi kondisi lingkungan ( a.l suhu, osmolaritas ), stress

Localization of eyestalk hormones that control severalphysiological systems from the sinus gland/X-organ complex of penaeid shrimp.

ENDOCRINE CONTROLENDOCRINE CONTROL

ECDYSIS - MOLTINGECDYSIS - MOLTING

• Exoskeleton separates from epidermis• New exoskeleton forms under old one• Old exoskeleton is shed (molted)• New exoskeleton is soft• Lobster takes on water and swells• Exoskeleton stretches to larger size• Exoskeleton hardens• Excess water is dumped from body

ECDYSIS - MOLTINGECDYSIS - MOLTING

ECDYSIS - MOLTINGECDYSIS - MOLTING

BEHAVIORAL ADAPTATIONSBEHAVIORAL ADAPTATIONS

Burrow into sediments Migrate either into or out of estuaries Migrate to spawn Adults do, young do not tolerate low or

varying salinities Calinectes sapidus (blue crab) Migrate as adults Use estuary as nursery area for juveniles Greater food, refuge (later)

BEHAVIORAL ADAPTATIONSBEHAVIORAL ADAPTATIONS

Terima KasihTerima Kasih

titi doc.2009