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The ICAR–Central Institute of Brackishwater Aquaculture (ICAR-CIBA), Chennai, has successfully demonstrated Blue Swimmer Crab (Portunus reticulatus) farming technology for the first time in India, marking an important step towards sustainable coastal aquaculture and diversification of mariculture.
About Blue Swimmer Crab
The Blue Swimmer Crab (Portunus reticulatus) is a brachyuran crab belonging to the Portunidae family. It is popularly known as the Blue Crab, Blue Swimmer Crab, Blue Manna Crab, and Flower Crab, owing to its distinctive appearance and swimming ability.
Distribution
The species is widely distributed across the Indo-Pacific region, including Indonesia, Vietnam, the Philippines, China, Japan, Malaysia, Australia, India, Sweden, and Singapore. In India, it occurs along both the east and west coasts, with the Palk Bay and the Gulf of Mannar supporting the most significant fisheries.
Physical Characteristics
The Blue Swimmer Crab is easily identified by its flat, disc-shaped hind legs, which function like paddles for swimming. Another distinctive feature is the presence of nine sharp spines (horns) along the carapace, located on either side of the eyes, giving it a characteristic appearance.
Habitat and Behaviour
The species spends most of its time buried beneath sand or mud, especially during the daytime and winter months. This burrowing behaviour contributes to its high tolerance to ammonium (NH₄⁺) and ammonia (NH₃), allowing it to survive in variable environmental conditions.
Feeding Habits
The Blue Swimmer Crab is primarily carnivorous and becomes active during high tide. It feeds mainly on bivalves, small fish, and, to a lesser extent, macroalgae, playing an important role in maintaining the ecological balance of coastal and estuarine ecosystems.
Importance
The successful farming of the Blue Swimmer Crab by ICAR-CIBA has the potential to enhance brackishwater aquaculture, improve coastal livelihoods, increase seafood exports, and promote the sustainable utilisation of marine resources in India.
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In every Lecture. Director Sir will provide conceptual understanding with around 800 Mindmaps.
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