The purpose of this research is To study the physical factors affecting the distribution of fish and a variety of fish. The mangrove development station 6 tambon Bang Khun Sai ban Laem Phetchaburi province. During February to July 2558 found a variety of fish. All 2 family 2 genera 2 type. Fish species found by Boleophthalmus boddarti (Pallas fish species, fish species 1770) has more than Periopthalmodon schlosseri (Pallas,, 1770) and the distribution of population density, fish from the fish The average density of 0.04 per square meter. The highest density is February in point C April in point E June, in point of C and July, in point D. As per square meter 0.08 found class type Periopthalmodon schlosseri (Pallas 1770), the average density of 0.04 one per square meter. The highest density is February in point C April in point E June, in point of C and July, in point D. As per square meter, the mudskipper 0.08 type Boleophthalmus boddarti (Pallas 1770), the average density 0.35 per square meters. M by the average density maximum is July in point A was 0.64 per square meters.