AQUACULTURE

Coastal Aquaculture has been recognized as an important tool for employment generation and a vital source of food supply for meeting the food security and nutritional requirements of our growing population. In the context of increasing food security in the modern world, fish and fishery products are considered to be among the safest foods of animal origin. Tamil Nadu is having the second longest coastline in the country with rich natural resources in coastal areas for coastal aqua farming. The total estimated brackish water area of Tamil Nadu is about 56,000 ha is under capture fisheries and an area of 6115.68 ha is under coastal aquaculture production, mainly shrimp aquaculture. In Tamil Nadu, shrimp farming has grown considerably and has emerged as a major commercial activity owing to the introduction of Specific Pathogen Free (SPF)Shrimp,Litopenaeusvannamei. So far, 1,859 shrimp farms (3,712.02 ha.) and 63 shrimp hatcheries have been registered under the Coastal Aquaculture Authority (CAA).Hence there is a wide scope for land based costal aquaculture development in Tamil Nadu. The district-wise details are given below:


District Brackish Water Area Potential Area Readily Available (in ha.)
Chennai 240 -
Thiruvallur 14660 2662
Kancheepuram
Villupuram 8100 2703
Cuddalore
Nagapattinam
Thiruvarur 31400 6300
Thanjavur
Pudukkotai
Ramanathapuram 900 1385
Tuticorin 400 1565
Thirunelvali
Kanniyakumari 300 18
TOTAL 56000 14880
aquaculture

Shrimp Farming:

The technical improvements made in shrimp farming in many parts of the world paved the way to increase shrimp farming through aquaculture by adopting extensive, modified extensive and semi intensive systems of shrimp farming in the areas where environmental conditions are well suited. Tamil Nadu is endowed with rich natural resources such as coastal zones in the form of brackish water / estuaries for shrimp culture. The brackish water resources of Tamil Nadu is about 56,000 ha. in which 18,000 ha. are identified as potential areas for farming. At present shrimp aquaculture has been developed in 12 maritime district of Tamil Nadu in about 4455 ha. The tiger shrimp (P.monodon) and white shrimp (P.indicus) are the most common species cultured in shrimp ponds. The farmers are encouraged to adopt traditional and extensive farming methods for sustainable aquaculture.

aquaculture

Sea Weed Farming

Sea Weeds are simple plants grown in the Shallow waters of the seas. These are popularly called "Sea Vegetables". There is a potential markets for the Sea Weeds. They can be easily cultivated with the help of floating rafts in the near shore areas. The Palk Bay and Gulf of Mannar area are abundant in Seaweeds. The Gulf of Mannar area is well suited for Seaweed farming. The seaweeds are the only source for the production of phytochemicals such as agar, carrageenan and algin. Seaweeds are divided into Green, Brown, Red and Bluegreen algae based on the type of pigments, external and internal structures.

The dominant varieties of Seaweeds are:
Gracilaria edulis, Gelidiellaacerosa, Sargassum, Turbinaria, Hypnea, Laurencia species.

Seaweed centres along the southeast coast of Tamilnadu:
1.Rameswaram, 2. Pamban, 3.Vedalai, 4. Pudumadam, 5.Periapattanam, 6.Kalimankundu, 7. Kilakarai, 8.Ervadi, 9. Valinokkam, 10.Kanyakumari area.

    There are two methods of cultivation of seaweeds.
  • 1. By means of vegetative propagation.
  • 2.Spores such as swarmers.
aquaculture

Mussel, Clam and Oyster Farming:

Mussel and Oysters are valuable shell fish resources of Tamilnadu. The Green Mussel Pernaviridis is predominant in Tamilnadu. Open seas and estuarine areas free from strong wave action for idle for Mussel culture. Clams are the most important among bivalve resources. Commercially exploited and cultivable clams are:-Meretrixcasta, M.Meretrix, Anadaragranosa. Rich beds of clams exist in Pulicat lake, Vellar, Athankarai and Punnakayal estuaries along east coast. There is great demand for clam meat, adductor mussle of Giant clam.

Oysters inhabit littoral and shallow sub tidal areas. They occur in wide range of in eco-systems including the coral reefs, mangroves and rocky shores. The dominant species are:-Crassostreamadrasensis, C.gryphoides, C.rivularis. Oyster reefs are considered as essential fish habitat. Oyster farming technology is a simple and easily adaptable technique. The different farming methods are:- Rack and ren method, Rack and tray method.

aquaculture

Pearl Oyster Farming

The Pearl Oysters (Pinctadasp) occur in the Gulf of Mannar, Palk Bay areas. Six species of Pearl Oysters occur in Tamil Nadu. Tuticorin Coast in Tamilnadu is well suited for Pearl Oyster farming. This farming technology can be done by Raft culture, Rack culture and Long line culture.

The natural pearls Oysters harvested from Gulf of Mannar region is held in high esteem due to its lustre. The pearls from Gulf of Mannar area is regarded as orien pearls.

aquaculture

Marine Fin Fish Culture

Cobia, Sea bass and Pompano are the most favoured candidate species for Fin fish farming. These fishes are highly priced marine food fishes having tender and tasty meat having good market potential. The enclosed bays, estuaries and shallow coastal waters are well suited for farming. The hatchery technology for seed production of sea bass has been perfected and seed production is not a constraint. The Sea bass can be grown in Cages erected in backwaters.

aquaculture

Crabs and Lobsters Farming

Tamilnadu is one of the leading states in India with tiny Lobster and Crab resources of high commercial value. About 700 tonnes are harvested every year in which nearly 50% are of undersized juveniles varying from 50 grams to 250 grams per piece. Moulted crab otherwise called as water crab does not fetch good market value. Once it reaches to 250 grams size the price variation is double or even triple. Growth rate of crab in cages is encouraging with supplementary feed.

Juvenile lobsters caught from the wild can well be grown to marketable size in cages by giving supplementary feed. The lobster juveniles grow at the rate of 1gram per day. Fibre Glass Reinforced Plastics Cages can be used for fattening of Crabs and Lobsters. Live export of lobsters and crabs fetch high market value.


Shrimp Farm Regulation

Consequent upon the enactment of the coastal Aquaculture Authority Act, 2005 (No 24 of 2005) by the Parliament, the Central Government has established the Coastal Aquaculture Authority vide Notification S.O.No.1803 (E), dated 22nd December 2005. Justice A.K.Rajan, retired Judge of the Madras High Court has been appointed as the Chairperson of the Authority. In exercise of the powers conferred by Section 24 of the Coastal Aquaculture Authority Act 2005, the Central Government has also made and notified the Coastal Aquaculture Authority Rules 2005 vide G.S.R.740 E dated 22nd December 2005. In exercise of the powers conferred in the Act and Rules, the Central Government as prescribed the process of Registration of the Coastal Aquaculture Farms which inter-alia includes the Fee for Registration, the manner for considering applications for Registration and Composition.

As on date there are 2086 shrimp farms functioning in all the 12 coastal districts of Tamil Nadu (except Chennai). Out of this, 852 shrimp farms covering total area 3000 ha. got approval from the Aquaculture Authority.