Irrawaddy dolphins (Orcaella brevirostris) are aquatic mammals with critically endangered status able to live in different water salinities habitats, like estuary, rivers and lakes. Banten Bay features estuarine area where rapid economic development, contributed from industry, ports, mining and fisheries, takes place, and thus the presence of Irrawaddy dolphins in the area faces various environmental threats. This research aimed to study the distribution of Irrawaddy dolphins in Banten Bay and explore environmental factors threatening its life. Dolphins observation was conducted from January 2013-February 2014, using direct visual effort by team of observer and indirect effort by local fishermen. Direct visual effort was performed on boat by three observers, with maximum vessel speed 15 km/hour and total length of transect was 404 Km. Indirect visual effort comprised of regular assessment by 32 local fishermen when they conducted capture fishing at two different areas (South and North of Banten Bay). Sightings data from direct and indirect visual observation compiled with respondents opinion were mapped using Arc View ® GIS 3.3, resulting in distribution map of Irrawaddy dolphin in Banten Bay. Irrawaddy dolphin was most frequently observed in the northeast, south and central areas of the bay. Environmental threats alarming the lives of Irrawaddy dolphin in the Banten Bay may include noise pollution, boat accident and entanglement.
Microplastics are a severe problem in several countries. Microplastics spread throughout the ecosystem both on aquatic and terrestrial. Those are very difficult to overcome as well as have an impact on the environment and affect food safety. This study aimed to know the penetration of microplastics into several organs in Nile tilapia. The experiment was conducted by given 30 grams of microplastic (a type of polyethylene scrub) into an aquarium (15 L) containing five fish (consumption size) for seven days. The results showed that microplastic penetration occurred in the blood, gills, gonads, intestines, liver, muscles, and stomach. These results explain that during a week of rearing, the fish have been exposed to microplastics. It was very dangerous for human health issues if consumed.
The highly use of polyethylene plastics in Indonesia has negative impact toward freshwater aquaculture systems. Omnivorous fish is one of the freshwater biota that exposed by microplastics. This study aims to determine the effect of microplastics to water quality and the prevalence of microplastic exposure in tilapia. The experimental design is conducted using a microplastic exposure (polyethylene scrub) with concentration of 0.01 g/L (P1), 0.1 g/L (P2), and 1 g/L (P3). Each treatment is repeated 3 times. The organ groups observed are the gastrointestinal, liver, gills, and gonads. The stages of the research including fish raising, microplastic extraction, water quality measuring parameter, and counting the amount of microplastics. The result obtained for water quality parameter is temperature, pH, and dissolved oxygen still within safe fish farming limit. Microplastics at high concentration in water can cause a decrease in the total value of ammonia and do not affect the value of water temperature, pH, and dissolved oxygen. Microplastics are found in the digestive organs, liver, gills, and gonads. The digestive tract of tilapia is the organ with the most microplastics after 14 days of exposure. It is concluded that microplastic is harmful for the life of tilapia because it can absorb to the liver and gonads.
Daerah Aliran Sungai (DAS) Cibanten mengalir membelah Kota Serang, berhulu di Gunung Karang (salah satunya, mata air di Situ Cibanten) dan alirannya berakhir di Teluk Banten. Pemanfaatan DAS Cibanten dilakukan dari hulu hingga hilir dengan berbagai kegiatan, yang berpotensi meningkatkan kesuburan perairan. Oleh karena itu, penelitian ini bertujuan mengevaluasi tingkat kesuburan perairan DAS Cibanten. Penelitian dilakukan pada bulan April-Mei 2018. Pengambilan sampel dilakukan pada tiga lokasi yang berbeda, yaitu Hulu (Hu), Tengah (T) dan Hilir (Hi) DAS Cibanten. Parameter perairan yang diukur secara insitu adalah kedalaman, suhu, kecerahan, warna perairan, pH, oksigen terlarut dan salinitas (khusus lokasi hilir sungai), sedangkan parameter yang dianalisis di Laboratorium Budidaya Perairan-UNTIRTA adalah fosfat dan klorofil-a. Tingkat kesuburan perairan dihitung menggunakan metode Trophic State Index (TSI). Hasil yang diperoleh bagian Hulu DAS Cibanten masuk dalam kategori mesotrofik, dengan karakteristik kecerahan maksimal sampai dasar perairan namun sebagian perairan terdapat tumbuhan air. Pada bagian tengah dan hilir masuk kategori eutrofik ringan. Parameter yang menjadi pembeda antara hulu, tengah dan hilir adalah kecerahan air. Kecerahan air yang rendah di tengah dan hilir diakibatkan oleh kekeruhan air. Hal ini ditunjukkan oleh air pada bagian tengah dan hilir berwarna keruh kuning kecoklatan, yang diduga berasal dari kandungan padatan tersuspensi.
Dugong dugon is a herbivorous marine mammal. One of Dugong's favorite foods is seagrass. This study examines the distribution of seagrass species to dugong sighting in Liki Island. The study was conducted in November 2018. Observation of seagrass conditions was carried out using a line transect method and a 50x50 cm transect with a distance interval between 10 m plots. Interviews were also conducted with the community to find out the location of Dugong presence in Liki Island. There are seven species of seagrass found in Liki Island :Enhalus acoroides, Cymodocea rotundata, Thalassia hemprichii, Halophila ovalis, Halodule uninervis, Halodule pnifolia and Syringodium isoetifolium spread over four observation stations. The results showed that Dugong in Liki Island is often found during the eastern season, they often appear in seagrass ecosystem area to do eating activities. Dugong is often found in the eastern part of Liki Island (Station 4) and sometimes also found in the western part of Liki Island (Station 3).Keywords:biodiversity,Dugong dugon, liki, papua, seagrass
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