Desa Betahwalang merupakan sebuah sentra pendaratan rajungan yang terletak di pesisir Kabupaten Demak Jawa Tengah. Kegiatan penangkapan rajungan adalah mata pencaharian utama nelayan Betahwalang. Lokasi dan waktu pengoperasian alat penangkapan ikan menentukan besar biaya operasional dan kualitas rajungan. Ketersediaan data dan informasi secara spasial dan temporal adalah faktor keberhasilan dalam kegiatan penangkapan dan sejauh ini belum tersedia secara rinci. Penelitian ini bertujuan mengkaji lokasi dan waktu penangkapan rajungan oleh nelayan Betahwalang dalam dua musim, yaitu musim angin barat (musim hujan) dan musim angin timur (musim kemarau). Data diperoleh dari wawancara terhadap 30 responden per jenis alat tangkap (bubu, arad, dan jaring insang dasar). Informasi tentang lokasi dan waktu penangkapan rajungan diplot langsung pada sebuah peta grid berukuran 1 km x 1 km. Selanjutnya, informasi dari peta tersebut dipindahkan ke peta grid berukuran 10 km x 10 km. Lokasi penangkapan dominan nelayan bubu di perairan sekitar bagian barat Betahwalang (zona E5) pada musim angin barat dan di perairan sekitar bagian utara Semarang (zona F6) pada musim angin timur, sementara lokasi penangkapan dominan nelayan arad adalah perairan sekitar bagian utara Semarang (zona F6) baik pada musim angin barat maupun timur; untuk lokasi penangkapan dominan nelayan jaring insang dasar pada musim angin barat adalah perairan sekitar bagian barat Betahwalang (zona G5) dan perairan sekitar bagian utara Semarang (zona F6) pada musim angin timur.Betahwalang is center of blue swimming crab (BSC) landing place in coastal area of Demak, Central java. BSC fishing is the main livelihood of betahwalang fishing community. The fishing area and fishing time determine the operational cost and BSC quality. The availability of data and information on spatial and temporal is successful factors in BSC fishing bussiness and these were not available yet. This study aimed to assess BSC fishing area and fishing time of Betahwalang fisher in two seasons, i.e westerly monsoon wind (wet season) and easterly monsoon wind (dry season). Data were collected through interview to 30 respondent for each type of fishing fleet (traps, mini trawl and bottom gill net). Information on fishing area and fishing time was plotted on the grid map 1 km x 1 km, then transferred to a grid map 10 km x 10 km. The result showed that the major fishing area of collapsible trap on the west monsoon around western of Betahwalang waters (zone E5), while during east monsoon they operated around northern of Semarang (zone F6). The major fishing area of mini trawl during west and east monsoon was on the waters around northern of Semarang (zone F6). The major fishing area of bottom gillnet on the west monsoon was around western of Betahwalang (zone G5), while east monsoon around northern of Semarang (zone F6).

Blue swimming crab is a fishery product with high economic value in Indonesia. Betahwalang Village, Demak, is one of the crab fisheries locations in the province of Central Java. High selling prices and processing industry demand encourages fishing activities. One issue brought on by increased fishing activity is the smaller crab size. It will impact the crab fishing industry in Betahwalang. The majority of the fisherman in Betahwalang Village catch crabs using arad nets, simple gill nets, and traps. This study aims to evaluate the size of crab catch results on fishing gear used by fishermen and recommend proper fishing gear for catching crabs. This research was conducted in April 2019. The catch size of crab was the primary data collected for this study, also with data on fishing grounds, methods, and characteristics of fishing gear. Data were collected by observation, interviews, and measurements of fishing gear and the carapace width of the crab. The results of data collection and processing were analyzed descriptively. The results showed that the highest proportion of legal size crabs (carapace width ≥10 cm) was caught in traps, while the proportion of unlegal size crabs caught was mostly in bottom gillnets and mini trawl.

Mikroplastik dapat mencemari air, tanah, tumbuhan, hewan, hingga manusia. Sumber limbahmikroplastik di perairan tawar antara lain dari industri, pertanian, dan aktivitas antropogenik dimana keseluruhannya dapat menjadi sumber pencemaran mikroplastik di laut. Ikan nila(Oreochromis niloticus) dan ikan layang (Decapterus ruselli) merupakan ikan omnivora yanghidup di kolom air, di mana ikan nila dibudidayakan di perairan tawar sedangkan ikan layangditangkap di laut. Proses identifikasi mikroplastik menggunakan mikroskop. Sebanyak 158mikroplastik telah ditemukan pada insang, lambung, dan usus ikan nila, sedangkan sebanyak 411mikroplastik pada insang, lambung, dan usus ikan layang. Jumlah mikroplastik jenis fragmen padainsang, lambung, dan usus ikan mendominasi, berasal dari fragmentasi plastik bahan polipropilendan polietilen. Jenis mikroplastik terbanyak kedua adalah fiber, dikenali dari bentuknya yangpanjang dan menyerupai tali atau benang berasal dari serat jaring serta peralatan rumah tangga.Pada ikan, mikroplastik jenis fiber dapat menggumpal atau membetuk simpul yang dapatmemblokir saluran pencernaan dan menghalangi jalan masuknya makanan. Mikroplastik jenis filmditemukan dengan jumlah yang paling sedikit pada ketiga organ ikan yang di analisis. Jenis inidiidentifikasi sebagai polimer polietilen yang berbentuk lembaran tipis hasil degradasi plastikkemasan, memiliki densitas paling rendah dari tipe mikroplastik lainnya.

Kiluan Bay is a coastal region in Tanggamus Regency, Lampung Province, with a very high potential for tourism. Increased levels of tourists may have a negative impact on Kiluan Bay's natural resources, one of which is the accumulation of trash. The ecosystem at Kiluan Bay may be impacted by trash accumulation, especially plastics. If these issues are not properly handled, it will have an impact on the sustainability of tourism activities and the preservation of the environment. Even so, this will have an effect on the local economy. In order to reduce the negative impacts of tourism activities that are not environmentally friendly, it is thought that the concept of ecotourism needs to be implemented at Kiluan Bay. The purpose of this study is to establish ecotourism development strategies that emphasize community knowledge at the local level. Survey techniques and interviews with relevant persons were used to collect the data. The results of the data collection were analyzed using a SWOT analysis to determine the alternative strategies required to support the implementation of the ecotourism concept in Kiluan Bay. The research showed that Kiluan Bay's ecotourism development is positioned in quadrant V (Growth/Stable). This viewpoint suggests that the ecotourism development strategy in Kiluan Bay, Lampung, must take the most of the existing opportunities. Developing an ecotourism management approach in Kiluan Bay that involves the community directly is one strategy that had to be implemented.