Good water quality is extremely important to support the life of the organism. The determination of water quality status was needed as a reference to monitor water pollution. This study aimed to assess the status of water quality and determine the pollution index based on physical-chemical parameters in the Youtefa bay tourism area. Sampling was carried out in august 2019 across six research stations; then, the result was compared with water quality standard based on KEPMEN-LH No. 51 the Year 2004 For marine biotas. The results showed that the parameter according to the quality standard is physics parameters; pH, Salinity, DO, and BOD5, while those that have exceeded the quality standards are total ammonia, nitrate, surfactant (detergent), phosphate and dissolved metal. The pollution index indicates the Youtefa Bay waters were in light to medium categories.

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This research was conducted in October 2017. The research location was the Hasanuddin University Education Pond, Bojo Village, Mallusetasi District, Barru Regency. The objectives of this study were: (a) To identify the various types of mangroves that make up the educational field in the Hasanuddin University Education Pond; (b) To Identify and to recognize the organisms associated with various types of mangroves that compose educational sites on the coast of the UNHAS Education Pond, and (c) To analyze data and information related to mangrove ecosystems and their associated organisms for the suitability of Education. Mangrove data collection using transect (Line transect) with 10 x 10 meters plot area, while collecting macrozoobenthos data using a scope and sieve net, while observing other parameters at the five stations with three replications carried out based on instructions (Englis, at.al., 1994; Noor, et al., 1999; Saru, 2013; and Bahar, et al., 2015). The results showed that 3 mangrove families were identified, namely Avicenniaceae, Rhizophoraceae, and Sonneratiaceae consisting of 7 species of mangrove, namely: Avicennia marina, Bruguiera gymnorhiza, Ceriops decandra, Rhizophora apiculata, R. mucronata, R. stylosa, and Soneratia alba. While the associated organisms, namely: 3 species for Carustacea, 4 species for Fish, 7 species for Mollusca, 3 species for Bird and 1 species for Reptile. Based on the results of land suitability analysis showed that the ecosystem of mangrove in Hasanuddin University Education Pond included in the conditional category for the development of Mangrove Education tour.

The stability of mangrove crabs (Scylla serrata Forsska 0 l) production were still constrained, especially the high mortality in the larval stage caused by vibriosis infection in the form of vibrio bacterial attack, so natural extracts as antibacterial such as R.stylosa and A.marina were needed. The purpose of this study was to assess the antibacterial activity R.Stylosa and A.marina of mangrove fruit extracts through in-vitro as the cause vibriosis of mangrove crab larvae. (Scylla serrata F). On fruit sample and extraction of active ingredients R.Stylosa and A.marina fruit were the initial stages of the study, then continued with bacterial isolation, soaked calculation of% and antibacterial activity test for antibacterial on vibrio bacteria. The results of the soaked calculation of% R.stylosa at the concentration of 2 mg / disk / 50 μl, the highest obtained in metanol was 12.92% and A.marina was 8.61% in metanol; The results of antibacterial activity based on inhibition zone area, for the highest R.stylosa in solvent metanol (11.40 mm) , in V.harveyi bacteria, then followed by 7.18 mm in V. alginolyticus bacteria, then 7.03 mm in V.paraemolyticus bacteria, where as the results of antibacterial activity based on inhibition zone area, for the highest A.marina in the Chloroform solvent (21.09mm), in V.harveyi bacteria, then followed 19 .08mm in V. paraemolyticus bacteria, and 11.80mm in V.alginolyticus bacteria. Obstacle zones obtained categorized as moderate to very high (> 11-<15mm = moderate; height = 15-20 mm; and very high => 20mm) based on the description at Zainuddin (2006) so that they met the requirements to be applied through in-vivo.

This study was conducted from June to November 2018 around the educational fish ponds of Hasanuddin University, Bojo Village, Mallusetasi Sub-District, Barru District, Indonesia. This study aimed to identify the mangrove species present, the crustacean and molluscan macrozoobenthos associated with the mangrove ecosystem, and to evaluate the level of stability of the mangrove ecosystem for the development of edu-tourism activities at the study site employing a Macrozoobenthos Ecological Index. Data on mangrove, macrozoobenthos, and other environmental parameters, were collected at five stations with three replicates per station. Mangrove data was collected within 10 m × 10 m plots, while macrozoobenthos were collected with a shovel and sieve net. Seven mangrove species were found: Avicennia marina, Bruguiera gymnorhiza, Ceriops decandra, Rhizophora apiculata, Rhizophora mucronata, Rhizophora stylosa, and Sonneratia alba. The width of the mangrove belt ranged from 28.23 to 57.00 m meaning that it was well below the national green belt standard (50-200 m). The organisms associated with mangroves included crustaceans (three species) and molluscs (seven species) with an abundance of 0.01 - 0.07 ind/m2. The Diversity Index was in the average category (1.49 - 1.92), while the Evenness Index ranged from unstable to under pressure (0.476 to 0.64). The Dominance Index was in the unstable category (0.185 - 0.264). Based on the Macrozoobenthos Ecology Indicator, the mangrove ecosystem in the fish ponds was categorised as stable to average. The land suitability analysis indicated that the mangrove ecosystem in the study site was in the conditionally appropriate category for the development of mangrove edu-tourism activities.

The reduction in the quantity of mangrove forest ecosystems will certainly have a negative impact on the balance of coastal ecosystems, people who live in coastal areas, and of course sustainable sustainable development proclaimed by the local government. The research objective is to analyze the damage of mangrove forest ecosystems through Environmental Science approach. One approach to the study in question is the remote sensing approach. The study was conducted throughout August 2018 precisely at Mampie Beach, Wonomulyo Subdistrict, Polewali Mandar District. The collection of mangrove forest vegetation data was conducted using purposive sampling (systematic plot) technique. The data used in the analysis of damage to mangrove forest ecosystems is the RBI Sheet Polewali Map Scale 1: 50000 BAKOSURTANAL in 1999, SPOT 4 Image in 2014, SPOT 4 Image in 2015, and Digital Globe Image Acquisition 6/9/2016. Data analysis and processing using the Arc-GIS program to analyze SPOT images, overlay and map making using Geographic Information System (GIS) applications, and descriptive analysis for the bio-physical data of mangrove vegetation. Data analysis of mangrove vegetation area in Mampie showed that overall from 1999 to 2016 the area of mangrove coverage experienced a shrinkage of 10.31 ha, namely 35.23 ha (1999) to 24.92 ha (2014). There is one thing that is quite encouraging that in the following year (2015) mangroves in the Mampie area expanded back to 0.58 ha ie to 25.50 ha but shrank back to 0.29 ha the following year (2016). Mampie Beach’s total mangrove area became 25.21 ha. The mangrove forest area in Mampie leaves only a few species of mangrove, the most dominating is Avicennia marina (Forsk.) Vierh.

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Mangrove merupakan salah satu ekosistem pesisir yang sangat penting karena memiliki fungsi ekologis serta ekonomis bagi masyarakat pesisir. Saat ini hutan mangrove mengalami kerusakan dari tekanan yang berat akibat pertumbuhan penduduk. Untuk mengurangi kerusakan mangrove maka perlu dilakukan upaya rehabilitasi mangrove. Penelitian ini bertujuan menganalisis dan memetakan kesesuaian lahan untuk mengrove di Kecamatan Bontoa. Manfaat dari penelitian yaitu memberikan informasi tentang analisis kesesuaian lahan untuk rehabilitasi mangrove. Penelitian ini dilaksanakan pada bulan Maret 2011. Metode yang digunakan adalah metode survey lapangan dengan parameter kondisi arus, pasang surut, gelombang, suhu, salinitas, kondisi substrat dan kemiringan lereng. Data dianalisis dengan metode skoring dan diplot berdasarkan peta. Hasil penelitian menunjukkan dua kategori kesesuaian yaitu sesuai dan cukup sesuai. Untuk jenis sesuai didapatkan jenis Rhizophora  spp, Avicennia  spp, Sonneratia alba , S. caseolaris , Bruguiera parvilofa  dan B. Xesangula . Sementara kategori cukup sesuai dari jenis B. gymnorhiza . Kondisi mangrove yang dapat direhabilitasi di Desa Ampelkale sebesar 55,375 ha, Desa Pajukuang 6,636 ha, dan Desa Bontobahari 16,011 ha.Kata kunci : kesesuaian lahan dan rehabilitasi ekosistem mangrove