Anthropogenic Effect on the Horseshoe crab Breeding ... Jayant Mishra.pdfDr. Jayant Kumar Mishra...
Transcript of Anthropogenic Effect on the Horseshoe crab Breeding ... Jayant Mishra.pdfDr. Jayant Kumar Mishra...
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Anthropogenic Effect on the Horseshoe crab Breeding Grounds and their
Population along the North-east Coast of Bay of Bengal, India
Dr. Jayant Kumar MishraDept. of Ocean Studies & Marine Biology
Pondicherry University, India
www.pondiuni.edu.in
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IWSCAHC-11
Harin bari
Mandir tala
Chemaguri
Cr
Meeti Nala
Tg
Breeding beaches at Sagar Island, Sunder bans
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IWSCAHC-11
Chemagudi creek, Eastern side of the Island; mangrove mud
flats; C. rotundicauda.
Meeti Nala; Western side of the island; sandy; T. gigas,
Cohabitation of Indian species in Sunderbans
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Chemagudi Creek at Sagar Island, Sunder bans
IWSCAHC-11
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Major cause of threat at Meeti Nala, Sagar island
Coastal erosion
Construction of Shore line sea walls
Four pairs encountered 8 nest with 100 – 430 fertilized
eggs
IWSCAHC-11
T. gigas
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IWSCAHC-11
Balaramgari
• Major fish landing centre• Tourist destination• Rapid urbanisation
Largest round for T. gigas at Balaramgari
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Total breeding groun now limited to 300-8002 mMajor threat :• erosion• excess human interference• use of creek for harboring & repairing
fishing boats
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IWSCAHC-11
Kasafali creek
A freak nesting ground of T. gigas
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Year Average no. of fertilized eggs
Total no. of observations(May to Aug.)
2008 260 08
2009 250 08
2010 200 08
2011 120 03 (May ad June only)
Average no. of nests and no. of eggs at Balaramgari
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IWSCAHC-11
Creek at Balaramgari , which is the main stay for T. gigas breeding.
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Use of Breeding beaches
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Exploitation of natural resources are need based
Individual – family – society – National -
International
• From individual consumption of horseshoe crab eggs
by sunderbans fisher folks to Restaurants in big cities.
• From traditional healers to LYSATE industries.
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But exploitation of natural breeding zones
(beaches) by different stake holders
influencing the population decline to a great
extent.
Attention may thus be made to protect those
zones instead of sea ranching only.
IWSCAHC-11
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Thank you all!
Save my dynasty
from the brink of extinction
IWSCAHC-11
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enjoy the rest of the workshop