Saturday, June 25, 2011

Biological features of the Macrobrachium Rosenbergii

Males can reach total length of 320 mm; females 250 mm. Body usually greenish to brownish grey, sometimes more bluish, darker in larger specimens. Antennae often blue; chelipeds blue or orange. 14 somites within cephalothorax covered by large dorsal shield (carapace); carapace smooth and hard.

Rostrum long, normally reaching beyond antennal scale, slender and somewhat sigmoid; distal part curved somewhat upward; 11-14 dorsal and 8-10 ventral teeth.

Cephalon contains eyes, antennulae, antennae, mandibles, maxillulae, and maxillae. Eyes stalked, except in first larval stage. Thorax contains three pairs of maxillipeds, used as mouthparts, and five pairs of pereiopods (true legs).

First two pairs of pereiopods chelate; each pair of chelipeds equal in size. Second chelipeds bear numerous spinules; robust; slender; may be excessively long; mobile finger covered with dense, though rather short pubescence.

Abdomen has 6 somites, each with pair of ventral pleopods (swimmerets). Swimmerets of sixth abdominal somite stiff and hard and, with the median telson, serve as the tailfan. Eleven distinct larval stages.

Extracted from the Food and Agricultural Organisation of the UN Website :
http://www.fao.org/fishery/species/2608/en

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