The purpose of this research is to study the physical factors on distribution andThe diversity of mangrove crab, the station area of mangrove forest resources development 6 Bang Khun Sai.Ban Laem Phetchaburi province from September 2558 to February 2559.The 5 spot areas showed crab all 2 family 6 types including crab claws, red (Chiromanthes eumolpe) green crab (Episesarma. Mederi) crab rock (Metopograpsus frontalis) crab claws (Orange) Parasesarma plicatum crab claws, purple, or crab (Sesarma mederi). Crab claws and a long (Metaplax elegans) and study the distribution of the population.Mangrove crab, crab all average density was 3.30 per square meters. The average density of the November in point B was 4.10 per square meters. The crab claws, red.(Chiromanthes eumolpe) average density in most points C in December equals.0.78 per square meter and crab claws, long (Metaplax elegans) have the average density in minimal points B in November was 0.60 per square meters. Including education.The relationship between physical factors and the distribution of population of crab. The average density of population crab all related with pH - alkaline, average of the sea.
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