The thesis deals with the results of the study of the population characteristics of the marine penaeid prawn, Penaeus monodon from South India. The present findings on the morphometric and biochemical genetic structure support the hypothesis that the populations of P.monodon of South India have homogeneous stock structure. To the contrary, the significantly different random amplified polymorphic DNA (RAPD) profiles in samples of Kochi and Chennai support the hypothesis that east and west cost populations of P.monodon are separate stocks.
Annies, Joseph; Dr.Rosamma,Philip(Cochin University of Science and Technology, July , 2008)
[+]
[-]
Abstract:
This thesis Entitled Haematological responses of penaeus monodon to environmental alterations and pathogenic invasion. Thesis concluded from the present study that stress is accompanied by
alterations in haemolymph metabolic variables and immune responses that influences the susceptibility of P. monodon to infection. Acute salinity variations were proved to be a stress condition that enhances the susceptibility of P. monodon to V. harveyi and WSSV infection. Ambient Cu at 0.1 mg 1" and ambient Zn at 1.0 mg 1" proved immunostimulatory in increasing the immunocompetence of P. monodon to WSSV infection and higher concentrations of Cu and Zn proved immunosuppressive.
Haemolymph total protein, total carbohydrates and total lipids showed the highest relation with immune responses. THC, PO, ACP and ALP that greatly correlated with the survival rate proposed as reliable biomarkers of health in P. monodon. The study highlights the need for proper management practices and regular health monitoring to be adopted to avoid mass mortality in shrimp culture ponds.
Description:
Department of Marine Biology, Microbiology and Biochemistry,
School of Ocean Science and T echnology,
Cochin University of Science and Technology
Lakshmi G,Nair; Dr.Rosamma,Philip(Cochin University of Science and Technology, May , 2008)
[+]
[-]
Abstract:
The present study revealed the importance of marine actinomycetes as a potent source of
bio active secondary metabolites. The selected isolates were capable of protecting Peaneus
monodon against WSSV infection. They also proved to be inhibitory to vibrios and
is a rich pool of hydrolytic enzymes. Their capacity to proliferate in saline environments
and their property of non-pathogenicity to prawns makes them good candidates to be applied
as probionts in penaeid shrimp aquaculture. They also enhanced the immune status of
shrimps challenged with WSSV and act as a good source of antioxidants. Exploitation of
the potential for the prophylactic and therapeutic measures in aquatic animal health management
would be highly rewarding. This work is a preliminary study targeting marine
actinomycetes as a source of antiviral compounds and as probionts in Penaeus monodon
culture systems. More work is needed to understand the nature and mode of action of the
bioactive compound, the various aspects of immune and antioxidant responses under challenge
and when exposed to pro active treatments, and the dose and frequency of application
of such compounds under rearing conditions.
Description:
Department of Marine Biology, Microbiology & Biochemistry,Cochin University of Science & Technology