Revegetation of abandoned aquaculture regions should be a priority for any integrated coastal zone management (ICZM). This paper examines the potential of a matchless time series of 20 very high spatial resolution (VHSR) optical satellite images acquired for mapping trends in the evolution of mangrove forests from 2001 to 2015 in an estuary fragmented into aquaculture ponds. Evolution of mangrove extent was quantified through robust multitemporal analysis based on supervised image classification. Results indicated that mangroves are expanding inside and outside ponds and over pond dykes. However, the yearly expansion rate of vegetation cover greatly varied between replanted ponds. Ground truthing showed that only Rhizophora species had been planted, whereas natural mangroves consist of Avicennia and Sonneratia species. In addition, the dense Rhizophora plantations present very low regeneration capabilities compared with natural mangroves. Time series of VHSR images provide comprehensive and intuitive level of information for the support of ICZM.
<strong>Heavy Metal Accumulation on Green Mussels in the Java Coastal Water.</strong>In many countries, green mussel (<em>Pernaviridis</em>) is harvested as food source. It is also commonly used as indicators for toxic contaminant, i.e. heavy metals, in the coastal waters. In Indonesia, green mussels are mostly cultivated in the north coast of Java where most industrial estates are located. Without further treatment, toxic contaminant of industrial waste may give impact to the surrounding environment, not to mention the adjacent coastal waters. This study was aimed to determine the accumulation of heavy metals, namely Hg, Pb and Cd, in green mussels. Green mussel samples were collected in 2017, taken from four culture sites in the north coast of Java: Panimbang, Jakarta Bay, Brebes and Cirebon. Our results showed that the concentration of Hg, Pb and Cd in green mussel tissues of those locations are: Panimbang = Hg: <0.22 mg/kg, Pb: undetectable, and Cd: 0.068 mg/kg; Teluk Jakarta = Hg: 11.7 mg/kg, Pb: 29.4 mg/kg, and Cd: 0.42 mg/kg; Brebes = Hg: 0.01 mg/kg, Pb: 3.52 mg/kg, and Cd: 0.4 mg/kg; and Cirebon = Hg: 0.01 mg/kg, Pb: 2.66 mg/kg, and Cd: 0.73 mg/kg. These results indicate that only green mussels from Panimbang contain heavy metals below the thresholds allowed to be consumed by humans
Budidaya air payau, terutama bandeng, telah dikenal sejak tahun 1400-an dengan menggunakan sistem tradisional. Peningkatan kebutuhan protein hewani membuat teknologi budidaya berkembang dan lahan produksi semakin luas. Untuk mendukung produksi perikanan yang lestari, maka pengumpulan informasi dan pendataan kawasan tambak merupakan hal yang sangat penting. Citra satelit resolusi tinggi yang diintegrasikan dengan Sistem Informasi Geografis (SIG) dapat digunakan untuk pemantauan lahan tambak. Bersama dengan pemetaan partisipatif oleh berbagai pemangku kepentingan, maka batas lahan tambak, permasalahan yang terdapat dalam kawasan budidaya tambak dan kemungkinan solusinya dapat diidentifikasi. Pemetaan Partisipatif-SIG (P-SIG) dapat menjadi metode yang tepat untuk menggalang partisipasi para pemangku kepentingan dan menangkap informasi baru di kawasan tambak Ujung Pangkah,Kabupaten Gresik seperti rendahnya kualitas air, terjadinya penyakit udang dan kematian massal udang, harga benih bandeng yang mahal, fluktuasi harga jual bandeng, perubahan lahan, saluran air/irigasi tambak yang dangkal dan sempit, dll. Selain itu, metode ini juga dapat memfasilitasi peserta untuk membuat keputusan manajemen pesisir yang lebih baik, seperti penentuan lokasi prioritas rehabilitasi saluran air/irigasi tambak, lokasi prioritas perlindungan pantai ataupun verifikasi data luasan tambak dengan surat izin usaha budidaya ikan. Namun, metode P-SIG membutuhkan waktu yang lama dalam prosesnya, serta membutuhkan banyak sumberdaya.
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