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The Journal of the Royal Institute of Thailand Volume IV - 2012 67  also some freshwater shrimp species such as Macrobrachium rosenbergii which use mangrove forests as spawning grounds. Following their spawning phase they return to grow in their native fresh water habitat. Figure 9 shows two species of commercially signi fi cant shrimps in mangrove forests. Mangrove Fishes Generally, fi sh are abundant in mangrove forests both in terms of number and diversity. Fish use mangrove forests as nursery grounds, breeding grounds, shelter and permanent habitats. Monkolprasit et al. (1983) classi fi ed approximately 72 mangrove fi sh species into four groups; true residents, partial residents, tidal visitors and seasonal visitors. Chanos c hanos , Lates sp and Mugil sp are the most commercially important fi sh species in mangroves as shown in Figure 10. Other common fi sh species found in the mangrove forest are Ambassis spp, Epinephelus spp, Leiognthus spp, Stigmatogobius spp, Lujanus spp, Brachygobius spp, and Boleophthalmus boddanti . Penaeus monodon Penaeus merguiensis Figure 9: Important commercially shrimp species in mangroves Chanos chanos Lates sp Mugil sp Figure 10: Important commercially fi sh species in mangroves Sanit Aksornkoae