Muara sungai menjadi tempat awal yang penting untuk ikan Sidat beruaya ke perairan sungai. Beberapa muara sungai yang ada di pesisir pantai Sukabumi menjadi daerah aktivitas penangkapan ikan Sidat yang tinggi, salah satunya adalah Sungai Cikaso. Penelitian ini bertujuan untuk mengetahui karakteristik habitat ikan Sidat dan faktor kualitas air yang memengaruhi kehidupan ikan Sidat di Sungai Cikaso. Penelitian dilakukan pada musim hujan (Maret 2019) dan musim kemarau (Agustus 2019). Penangkapan benih ikan Sidat menggunakan alat tangkap sirib dan ikan Sidat dewasa menggunakan alat tangkap bubu, pancing, jamparing dan kopyokan, serta pengamatan kualitas air dilakukan di tujuh stasiun penelitian yang dilalui selama ikan Sidat beruaya. Benih ikan Sidat diidentifikasi secara morfometrik dan perbedaan pigmentasi warna diamati di bagian sirip ekor. Dua spesies ikan Sidat ditemukan selama penelitian, yaitu Anguilla bicolor bicolor dan Anguilla marmorata yang teridentifikasi dari fase benih hingga ikan Sidat dewasa. Sebaran ikan Sidat di sepanjang Sungai Cikaso selama penelitian ditemukan dalam empat stadia siklus hidup, yaitu benih ikan Sidat, ikan Sidat berpigmen, ikan Sidat muda, dan ikan Sidat dewasa. Secara keseluruhan, ketujuh stasiun penelitian mempunyai karakteristik habitat perairan yang sama dalam mendukung kehidupan ikan Sidat. Keberadaannya di perairan dicirikan oleh parameter kualitas air seperti suhu air, kekeruhan, TDS, kecepatan arus, salinitas, oksigen terlarut, alkalinitas, dan pH perairan. Namun, fenomena muara sungai yang tertutup pada saat musim kemarau menyebabkan air sungai tidak mengalir menuju ke laut. Kondisi ini sangat memengaruhi pola ruaya ikan Sidat, yaitu menghambat pergerakan benih ikan Sidat dari laut menuju ke sungai. Oleh karena itu, solusi perlu dicari agar ruaya semua spesies ikan Sidat yang masuk ke Sungai Cikaso tetap terjaga.

Penelitian dilakukan di perairan Teluk Gerupuk pada bulan April, September 2015 dan Mei 2016 dengan tujuan untuk mengetahui distribusi dan kelimpahan fitoplankton di Teluk Gerupuk Nusa Tenggara Barat. Metode yang digunakan untuk menghitung kelimpahan fitoplankton menggunakan” Sedgewick-Rafter Counting Cell” dan analisis kualitas air merujuk pada APHA (2005). Penelitian di lakukan di 9 (Sembilan) stasiun penelitian dengan hasil kelimpahan fitoplankton berkisar antara: 619.958 – 7.456.476 sel/l; yang terdiri dari 2 kelas fitoplankton yaitu: Kelas Bacillariophycea, terdapat 32 jenis dan Kelas Dinophyceae terdapat 5 jenis yang ditemukan pada 9 (sembilan) stasiun pengamatan dengan lima jenis diatom potensial, yaitu Coscinodiscus sp., Chaetoceros sp., Nitzschia sp., Pleurosigma sp., dan Bidduphia sp. Berdasarkan indeks biologi terlihat bahwa kelimpahan tertinggi dan dominansi fitoplankton dari genus Chaetoceros sp. Keanekaragaman fitoplankton yang rendah dengan kisaran 0,24-98 dengan rata-rata 0,58±0,29, dan keseragaman fitoplankton berkisar antara: 0,01-0,05 dengan rata-rata 0,03±0,02 atau dengan kata lain 0<E<0,5 berarti komunitas fitoplankton tertekan.

Kegiatan budi daya ikan di Waduk Jatiluhur yang berkembang pesat saat ini, telah menurunkan kualitas perairannya.

Seaweed is one of the vital export aquaculture commodities in West Java of Indonesia. Since 2013, seaweed production in Muara Gembong Sub-District, especially Pantai Mekar Beach and Pantai Sederhana Villages, can be produced 7.000 tons from total 10.000 seaweed culture fisheries of Bekasi District (80%) that was developed with a polyculture system. To ensure the long-term success of providing seaweed production, evaluation of suitable location is an essential step in any aquaculture operation. This study was conducted to analyze suitable sites for seaweed aquaculture in the coastal area of Muara Gembong based on the condition of water quality. Water quality data were collected from 11 stations during field surveys in March, July, and October 2018. Water quality parameters were observed with physical parameters (Secchi disk transparency, temperature, and depth) and chemical parameters (salinity, pH, DO, phosphate, and nitrate). Evaluation of water quality data included compile of matrix suitability design through some works of literature. The suitability coastal areas were analyzed to get suitable location used GIS software from coordinate data and water quality parameters, which were compared. The class “suitable” has a score of 4, the “suitable enough” class has a score of 3, the “suitable with conditionals” class has a score of 2, and the class “not suitable” has a score of 1. Based on the measurement result, the “suitable” areas were Station 7 (Front of Muara Mati), Station 8 (Outermost Muara Mati), Station 11 (Muara Kuntul), and Station 12 (Front of Muara Kuntul). The coverage area that was in a suitable area category is 962.72 Ha (9.63 km2). The location also linear with the result based on salinity, DO, and transparency (Secchi dish transparency). There are selected locations compared with other stations in Muara Gembong coastal waters because those locations face waste problems from Citarum Watershed and Jakarta Bay. Also, the sites serve as a source of livelihood for the community.

The highest tourism frequency at Tunda Island is provided a positive effect on community livelihood, but the activities of tourism behaviour are not environmentally friendly which would affect nature and also can make habitat degradation in the coastal area. There was no specific research until now regarding the condition of suitable marine tourism in Tunda Islands as ecotourism areas. This research aims to analyze the suitability aquatic area to plan an ecotourism area in Tunda Island, Serang Regency. The research method used a purposive sampling method and it was conducted in July to September 2019. The results obtained showed that the highest suitability index on coastal tourism potentials (recreation) was 76.2% (very suitable), mangrove tracking was 12.8% (unsuitable), snorkeling tourism was 54.4% (suitable), and dolphin watching was 57.6% (suitable). Tunda Island has developed potential tourism that is promising, but it still needs some infrastructure procurement and facility improvement to support tourism activities. The ecotourism potential has a high sell point but its poor data is in dolphin watching. It would be temporal data with at least one-year sampling by carrying out the sampling for every month.