The study is performed in Samataring and Tongketongke sub-districts, East Sinjai District, Sinjai Regency, South Sulawesi, Indonesia. It aims at identifying species composition of mangrove vegetation, analyzing characteristics of mangrove ecosystem, and studying economic valuation of mangrove ecosystem. Identification on the three research sites found four types of mangrove vegetation by 86.53% Rhizophora, 7% Bruguira, 4.15% Avicennia, and 2.34% Senneratia; characteristics of mangrove ecosystem are absolute density by 1.01 m -2 or 10.010 plant m -1 , relative density covers: Rhizophora 87.76%, Bruguira 6.70%,

Mangrove trees plantation program is expected to restore a damaged environment. The purpose of this research was to: (1) identify the part of mangrove that serves as disaster mitigation (2) analyze the function of mangrove physical ecosystem in preventing a natural disaster, and (3) analyze economic value of mangrove ecosystem in overcoming natural disaster for the coastal community. The method used in this research are creating the transect the location of observation and analyzing the economic valuation. The results of this study are as follows: (1) roots, stems, branches and twigs that make form a unity as mitigation of coastal natural disaster and small island, (2) mangrove roots consists of various types and cross-shapes vertically and horizontally , other than that the roots, stems, branches, and twigs of mangrove vegetation strong and elastic so it is not easily broken or cut, and (3) the value of mangrove valuation from physical function to overcome natural disasters is about IDR. 6, 075, 892, 844. The suggestion in rehabilitation effort or recovery of mangrove ecosystem should be done semi-natural. Let human only spread the seeds of various types of mangrove on the expanse to be restored its ecosystem as well as let distance and line grow naturally. Rehabilitation result of mangrove ecosystem is expected to reach high diversity level and adaptive to the environment. In addition. let every mangrove seeds grow naturally ensuing the ecological condition.

This study was conducted at Gentungan village, West Bajeng District, Gowa Regency, South Sulawesi Province, Indonesia for four months, i.e., from March to July 2016. The study aimed to (1) determine the feasibility of water quality for nursing at the former land of red stone excavation, (2) analyze the growth rate, and (3) analyze the survival rate. Method used in this study was the stick net cage system which sized 4.0 × 3.0 × 1.5 m, with an average density was 20 fish/m 3 . The results showed that (1) the measurement and analysis results of water quality during the nursering period were still in the limits of feasibility as presented in Table 1, (2) the analysis results of growth rate were obtained an average growth rate of 117 gram for 160 days, and (3) the survival rate was 86%.

Tujuan penelitian ini adalah  : (1) untuk menganalisis kualitas tanah tambak,  (2) untuk menganalisis kualitas air,  (3) untuk menganalisis tingkat kelangsungan hidup, dan (4) untuk menganalisis laju pertumbuhan. Metode penelitian yang digunakan yaitu menggunakan empat petak sebagai wadah pemeliharaan budidaya udang vanamae dengan luas masing-masing 1.750 m2 dengan tebar benur udang vanamae masing-masing petakan 150.000 ekor. Hasil analisis penelitian sebagai berikut : (1) hasil analisis tanah menunjukkan bahwa semua parameter berada dalam batas optimal, pada awal pemeliharaan, (2) analisis kualitis air selama pemeliharaan menunjukkan berfluktuasi utamanya pH, amoniak, dan kecerahan, akan tetapi dalam batas toleransi, (3) analisis tingkat kelangsungan hidup rata-rata semua petakan anatara 10% sampai 20% , dan (4) tingkat pertumbuhan rata-rata 65 ekor perkilogram atau laju pertumbuhan harian rata-rata yaitu sebesar 0.17 gram perhari. Hasil produksi usaha udang vanamae  dengan padat tebar 860.000 ekor ha-1 yaitu sebesar 590 kg ha-1 persiklus atau setara Rp.38 juta persiklus atau 76 juta ha-1 th-1..Saran untuk budidaya udang vanamae dengan sistem intensif memerlu-kan sirkulasi air yang tinggi, oleh karena itu, lokasi yang dipilih untuk usaha budidaya udang vanamae yaitu lokasi tambak yang mempunyai sumber air yang memadai