This research aims to study the physical factors per species and.A variety of sesarma mangrove resources development station 6, bang Khun Sai. Amphoe ban Laem phetchaburi province, between the months of September to February, 2558 2559. 5 points, the study area. Sesarma found total 2 6 kinds of sesarma dynasty red claw (Chiromanthes eumolpe) (Episesarma mederi) Green sesarma sesarma stone (Metopograpsus frontalis) sesarma Orange claw (Parasesarma plicatum) purple claw or crab sesarma samae (Sesarma mederi) and sesarma long claws (Metaplax elegans) and the study of the distribution of the population.Sesarma sesarma all density is equal to the average of 3.30 per square meters, with the highest average density is November. In point B is equal to 4.10 per square metre. Sesarma found red claws(Chiromanthes eumolpe) is the most average density in point C in the month of December is equal to. 0.78 per square meter and sesarma long claws (Metaplax elegans) with the average density in point B in November, equal to 0.60 per square metre including studies.Relation between physical factors with the species of sesarma population found that the average density of the population all of sesarma correlated with acid. – Spotted sea average.
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