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Very low impact pens created in mangrove areas, with some digging where needed to ensure water is present during low tide, can be used to harvest crabs without damaging the mangrove ecosystem. [11] These usually have one crab per square meter, producing 1,400 kilograms (3,100 lb) per 1 hectare (2.5 acres). [15]
The pair attached to the first segment of the head are called primary antennae or antennules. This pair is generally uniramous, but is biramous in crabs and lobsters and remipedes . The pair attached to the second segment are called secondary antennae or simply antennae .
Territorial waters and exclusive economic zone of the Philippines. The Philippines is an archipelagic state whose over 7,000 islands [1] with their large coastal population [2]: 2 are surrounded by waters including 2,263,816 square kilometres (874,064 sq mi) of exclusive economic zone and 679,800 square kilometres (262,500 sq mi) of territorial sea, [3]: 1 of which 184,600 square kilometres ...
Bycatch in crab gillnets can reach up to 45% of the catch, and much is thrown out. Of the crabs caught, around 3 of every 10 caught are immature, and 1 or 2 are egg-bearing females. Gillnets in the Malampaya Sound have entangled dolphins, including the Irrawaddy dolphin. Up to a quarter of gillnets are lost each year, becoming ghost nets.
These large crabs have a bright red body with small white eyespots surrounded by black. Their bodies are covered with long erect coarse hairs of a dark red color. They have a pair of long white primary antennae or antennules, a pair of secondary antennae, stalked green brown eyes and three pairs of mouth appendages. The stalks of the eyes are ...
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Portunus pelagicus, also known as the blue crab, blue swimmer crab, blue manna crab and flower crab is a species of large crab found in the Indo-Pacific, including off the coasts Indonesia, [1] Malaysia, [2] Cambodia, [3] Thailand, [4] the Philippines, [5] and Vietnam; [6] and in the intertidal estuaries around most of Australia and east to New Caledonia.
As at 2023, the World Register of Marine Species recognises 9 species of Sesarmops, with two former species moved to Orisarma. [5]Sesarmops angustifrons (A. Milne-Edwards, 1869)