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Neuroendocrine control of vitellogenesis In the spiny lobster Panulirus homarus (Linnaeus, 1758)

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Relation http://eprints.cmfri.org.in/7133/
 
Title Neuroendocrine control of vitellogenesis
In the spiny lobster Panulirus homarus
(Linnaeus, 1758)
 
Creator Fernandez, Rachel
 
Subject Fish physiology
Theses
Lobsters
 
Description The female reproductive system of the spiny lobster Panulirus
homarus ( Linnaeus, 1758 ) was investigated histomorphologically and
ultrastructurally to study the process of ovarian development and vitellogenesis
in detail. The general morphology of the central nervous system was traced
out. The neurosecretory cells in the optic ganglia, supraoesophageal ganglion
and thoracic ganglia were identified, classified and mapped. The optic ganglia
have six types of neurosecretory cells whereas both the supra oesophageal
ganglion and the thoracic ganglia have eight neurosecretory cell types.
Secretory cycle of the neurosecretory cell types was studied and it was
classified into four phases, viz. synthetic phase, vacuolar phase, secretory
phase and quiscent phase. Secretory status of the various neurosecretory
cell types was studied at different stages of ovarian development. The
vitellogenin unit from the haemolymph and the vitellin unit from the ovary was
isolated and characterized. The immunodiffusion precipitation studies and the
ultrastructural studies reveal that there is exogenous vitellogenin synthesis in
Panulirus homarus. The hepatopancreas and the adipose tissue are likely
to be the sites of vitellogenin synthesis. Bilateral eyestalk ablation studies
conducted on the early and late intermoult stages show simultaneous
acceleration of the somatic growth and reproductive processes with higher
emphasis for ovarian growth in lobsters ablated in the early intermoult phase
and lower activity in those ablated in the late intermoult phase. Ablation in late
intermoult phase resulted in faster entry into the premoult stage. Administration
ofthe aqueous extracts of supraoesophageal ganglia and the thoracic ganglia
from the maturing female lobsters accelerated vitellogenesis when they were
injected into the lobsters. Injection of neuroregulators accelerated vitellogenic
process in those injected with 5-hydroxytryptamine unlike the dampened effect
in lobsters administered with dopamine.
 
Date 2002
 
Type Thesis
NonPeerReviewed
 
Format application/pdf
 
Language en
 
Identifier http://eprints.cmfri.org.in/7133/1/TH-109.pdf
Fernandez, Rachel (2002) Neuroendocrine control of vitellogenesis In the spiny lobster Panulirus homarus (Linnaeus, 1758). ["eprint_fieldopt_thesis_type_phd" not defined] thesis, PGPM, Central Marine Fisheries Research Institute.