biodiversity chilika lake
TRANSCRIPT
Bio- Diversity
Refers to the numbers, variety and variability of
living organisms and ecosystem
Includes all terrestrial, marine and other aquatic
organisms
Covers diversity within species, between species as
well as variations among ecosystems.
Biodiversity is the degree of variation of life forms within a given ecosystem, biome, or an
entire planet.
Chilika lagoon is situated on the east coast of India between 19O 54’ North
latitude and 85O 35’ East longitude connecting the Bay of Bengal
Extends from Southwest corner of Puri and Khurda districts to the adjoining
Ganjam District in the state of Orissa
Lake Chilika, Asia’s biggest salt water lake in the eastern coast of India,
The Lake itself can be broadly divided into four ecological sectors based on
salinity and depth
Southern zone
Central zone
Northern zone
Introduction- Chilika Lake
A pollen analysis study indicates that the oldest sediments in the lake are
13,500 years old.
At that time, Chilika was a river mouth or a river delta with fresh water
vegetation.
With increase in the sea level, after 9,500 years, the area became an
estuary with mangrove vegetation.
The average water spread area of the lagoon is 1055sq.km.
It covers an area of 1165sq.km. in the rainy season and 965 sq.km. during
summer.
At Chilika (Madhusmita, 2012)
4 types of Crocodiles,
24 types of Mammals,
37 types of Reptiles and amphibians are seen.
The total number of fish species is reported to be 158, along with a
variety of phytoplankton, algae and aquatic plants.
726 types of flowering plants, five types of grasses and mangroves are
also present here.
Diversity of Chilika Lake-
On the basis of habitat-
150 are marine,
24 are fresh water and
119 are brackish water species.
Commonly found fishes are
Milk fish (Chanos chanos),
Sparidae (Calamus bajonda),
Ompok (Ompok bimaculatus),
Wallago attu, Bhekti (Latescalsifer) etc..
In this lake-
28 types of prawn as well as 38 types of crab are available.
There are 212 sites for catching fish.
5-7 lakhs of migratory birds visit the lagoon annually .
The lagoon hosts over 205 species (2004 census) during peak
migratory season
As per the Chilika Development Authority’s (CDA) updated data (2002)-
323 aquatic species,
which includes 261 fish species,
28 prawns and
34 crabs are reported out of which sixty five species breed in the lake.
27 species are freshwater fishes and two genera of prawns.
The remaining species migrate to the sea to breed.
21 species of herrings and sardines of the family Clupeidae are reported.
It is one of the biodiversity hot spots of the country
Some rare, vulnerable and endangered species listed in the IUCN Red
List of threatened animals inhabit the Lake area for at least a part of
their life cycle.
Microalgae, marine seaweeds, sea grasses, fishes and crabs also
flourish in the brackish water of the Chilika Lagoon
The lagoon is a highly productive ecosystem with rich fishery
resources
Physical CharacteristicsDescription
Chilika's surface area varies between 906 square km
to 1,165 square km.
35 rivers and streams drain into the lake
Surface Area 1,100.00 km2
Depth Mean depth: 1.4 m
Maximum depth: 2.4 m
Residence Time 1.0 years
Origin Shorelines
Type Saline, Permanent, Natural
Catchment Catchment size: 4,300.00 km2
Catchment/surface area ratio: 4:1 [email protected]
Flora The flora is predominantly of aquatic and sub-aquatic plants
Recent surveys revealed an overall 726 species of flowering
plants belonging to 496 genera and 120 families
Fabaceae is the predominant plant family followed by Poaceae
and Cyperaceae
Five species of seagrass
Mangrove associates, such as Aegiceras corniculatus,
Excoecaria agalloch, Salvadora persica, Pongamia pinnata,
Colubrina asiatica, Capparis roxburghii, Macrotyloma ciliatum
and many others.
After reopening of the lake mouth in 2000, six
threatened species have reappeared, including:
Milk fish (Seba khainga),
Indo-Pacific tarpon (Panialehio),
Ten pounder (Nahama),
Bream (Kala khuranti),
Hilsa (Tenuealosa) ilisha (ilishi) and
Mullet R. corsula (Kekenda)
Commercial fisheries Butter catfish and Wallago attu are the most common
type of fish found in the lake
11 species of fish, 5 species of prawn and 2 crab
species are commercially important
The commercially important prawn are Giant tiger
prawn, Penaeus indicus (Indian white shrimp),
Metapenaeus monoceros (Speckled shrimp),
Metapenaeus affinis (Pink prawn) and Metapenaeus
dobson (Kadal shrimp)
Mangrove crab (Heloecious cardiformies) is the
most important commercial crab.
Against an all time lowest landing of fish and
prawn of 1,269 t (1,399 short tons) in 1995–96, the
all time high is reported to be 11,878 t (13,093
short tons) during 2001–2002
Recently, the Government of Orissa have issued a
notification banning the lease of Chilika Lake for
Culture Fishery.
Dolphins The Irrawaddy Dolphin (Orcaella brevirostris) is
the flagship species of Chilika lake
Chilka is home to the only known population of
Irrawaddy dolphins in India and one of only two
lagoons in the world that are home to this species
It is classified as Critically Endangered, in five of
the six other places it is known to live
The number of dolphins sighted has varied from
50 to 170.
A 2007 census revealed 138 Dolphins.
Measures for increasing fish production Regulation of fishery activities as per the provision of
Orissa Marine Fisheries Regulation Act (OMFRA).
Complete ban on shrimp culture.
Routine surveillance by the Task Force.
Practicing Responsible Fishery Practices.
Legislation on regulation of fishery in Chilika.
