Sea Cage culture of spiny lobsters and natural collection of ... pm...Sea Cage culture of spiny...
Transcript of Sea Cage culture of spiny lobsters and natural collection of ... pm...Sea Cage culture of spiny...
Sea Cage culture of spiny lobsters and natural
collection of lobster post – larvae (Puerulii)in India: –
An alternate employment / additional source of
income for coastal fishers.
Technology on fattening of Indian juvenile spiny lobsters Technology on fattening of Indian juvenile spiny lobsters Panulirus homarusPanulirus homarus
Background: From India under sized juvenile lobsters were exportBackground: From India under sized juvenile lobsters were exported to South East ed to South East
Asian countries for further fattening to marketable size.Asian countries for further fattening to marketable size.
Technology was developed to fatten the juvenile lobsters under cTechnology was developed to fatten the juvenile lobsters under captive conditions aptive conditions
using live feeds.using live feeds.
Maximum growth of 25 Maximum growth of 25 –– 27 g /month was achieved with almost 95% survival.27 g /month was achieved with almost 95% survival.
Species tried: Species tried: P. homarus, P. P. homarus, P. ornatusornatus, P. , P. versicolorversicolor and P. penicillatusand P. penicillatus
Suitable species: Suitable species: P. homarusP. homarusDo n
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Transfer of technology
•• The technology was transferred to coastal The technology was transferred to coastal
fishers through a pilot scale demonstrative fishers through a pilot scale demonstrative
cage culture.cage culture.
•• Size of stocking: 100 Size of stocking: 100 –– 125 g125 g
•• Maximum growth of 35 Maximum growth of 35 –– 37 g/month was 37 g/month was
achieved with almost 90% survival.achieved with almost 90% survival.
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•• As a part of its societal programme to As a part of its societal programme to
enhance the earning capacity of coastal enhance the earning capacity of coastal
people in and around the islands, the NIOT people in and around the islands, the NIOT
decided to introduce sea cage culture of decided to introduce sea cage culture of
lobsters.lobsters. The NIOT has developed a floating The NIOT has developed a floating
cage for fattening of lobster in open sea. cage for fattening of lobster in open sea.
The cage has been successfully tested at The cage has been successfully tested at
Tharuvaikulam in Tharuvaikulam in ThoothukudiThoothukudi..Do not
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NIOT’s design (MS CAGE)
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First demonstrational MS cage
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NIOT’s Modified FRP Cage
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Lobsters within the cage
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NIOT’s demonstrational cage culture
site at Tharuvaikulam, Tamil Nadu
Lobster cage
M ussel culture poles
Lobster cage
M ussel culture poles
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•• The beneficiaries were able to collect The beneficiaries were able to collect
approximately 34 lobster juveniles through approximately 34 lobster juveniles through
auto stocking over a period of 6 months in auto stocking over a period of 6 months in
the demonstrational cage culture activity. the demonstrational cage culture activity.
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Live Feed Back – up facility
Mussel culture polesMussel culture poles
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Monthly growth rate of lobsters
reared in sea cages
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5
10
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June-July July-Aug Aug-Sep Sep-Oct Oct-Nov Nov-Dec
Rearing period
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Me
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Wt (g)
CL
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One of the notable features of the cage culture One of the notable features of the cage culture
was that it acted as a lobster aggregating was that it acted as a lobster aggregating
device and many baby lobsters entered the device and many baby lobsters entered the
cage and grew with the stocked ones. cage and grew with the stocked ones.
More Numbers (rough estimate of More Numbers (rough estimate of
1250/site/year) of post 1250/site/year) of post –– larvae settled larvae settled
around the cages and returned with 95% around the cages and returned with 95%
survival.survival.
Juvenile lobster attracted
Some important observations Some important observations
made during the cage culturemade during the cage culture
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Number of lobster post – larvae entered during the
demonstrational cage programme (6months)
3521.12.2003
2319.11.2003
116.10.2003
516.08.2003
2314.07.2003
502.07.2003
Number of post larvae (Puerulii/post Puerulii)Date
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•• The arrival of new juveniles may be due to The arrival of new juveniles may be due to
the suitable substratum for settlement, the suitable substratum for settlement,
conspecificconspecific attraction and acoustic signals attraction and acoustic signals
emitted by the lobsters. emitted by the lobsters.
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Growth of puerulii in sea cages
•• The first measurement of post puerulii was The first measurement of post puerulii was
taken in August and its growth taken in August and its growth
•• was monitored for 10 months till the end of was monitored for 10 months till the end of
April 2004. From an average weight of 12g April 2004. From an average weight of 12g
in August 2003 the lobsters grew to 140g in in August 2003 the lobsters grew to 140g in
8 months time. This is a very fast growth 8 months time. This is a very fast growth
rate and theoretically makes it possible to rate and theoretically makes it possible to
grow spiny lobster post larvae to marketable grow spiny lobster post larvae to marketable
size of over 200g in a yearsize of over 200g in a year..Do n
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Involvement of Self Help Group women
under Rural Development ProgrammeTharuvaikulamTharuvaikulam
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