Background: This study aimed to investigate the abundance of microplastics in the eastern water of Java Sea. The study areas are well known for the high population and high industrial activities that can contribute to the plastic pollution. Methods: Microplastics were sampled from the surface sediments at five different stations representing different local activities: fish landing area (St 1), mangrove forest (St 2), abandoned shrimp pond (St 3), river mouth (St 4) and open sea (St 5). Results: Three types of microplastics were found; the most common was plastic fragments (54.34±6.39%) followed by fibers (41.45±4.59%) and films (4.21±3.90%). The highest abundance of microplastics was observed in the mangrove area (896.96±160.28 particles/kg), dominated with fragments and fibers. Films were found in greatest quantities in the fish landing area, but compared to the other types of microplastics, the abundance was much lower (80.73±37.62 particles/kg). Domestic wastes and fisheries activities were the main causes of the high microplastics in the study areas. Conclusions: The results of this study showed that microplastic pollution is a serious problem that needs to be paid attention not only from the government but also from the local people. Plastics management waste is needed.

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Pollution has become the serious problem in aquatic ecosystems in Indonesia including east part of the coastal area of Surabaya City. One of the methods that can be used to analyze water quality in the coastal area is pollution index method. The method can provide information related to existing water quality in respect of utilization plan. The purpose of this study is to analyze the water quality in the coastal area in East part of Surabaya City based on the physical and chemical parameters, and then, analyze the data using pollution index method. The sampling points of this study are 10 areas in the coastal area in East Part of Surabaya City. The result of this study showed that the water parameters in the sampling points are described as follows:

HighlightHeavy metals (Cu, Zn, Pb, and Cd) in the seawater, sediment, and soft part of marine mussels were analyzedBioaccumulation Factor (BAF), Estimated Daily Intake and Target Hazard Quotient (THQ) were calculatedHeavy metals in the seawater, sediment and marine mussels were found in varying concentrationsHealth risk assessment indexes showed low values which means insignificant health hazardAbstractMarine mussels are known as one of the biological indicators of heavy metals pollution in the aquatic environment and the sources of protein for human consumption. This study aimed to investigate the concentration of heavy metals (Cu, Zn, Pb, and Cd) in the seawater, sediment, and soft parts of the marine mussels (Perna viridis, Meretrix sp., and Anadara granosa), as well as to evaluate its health risk of consumption from Madura Strait, Indonesia. The seawater, sediment, and marine mussels were obtained from four sites and heavy metal concentrations were analyzed using Atomic Absorption Spectroscopy. In the seawater, heavy metals were in the order of Cu, Pb, Cd, and Zn from the highest to the lowest concentration respectively, while they went down in the order of Zn, Cu, Pb, and Cd in the sediment respectively. Excluding the Pb, higher Cu and Zn concentrations were observed in marine mussels than in seawater and sediments (BAF> 1). Furthermore, it was proven that Cu and Zn were considered as essential metals and required for metabolism, while Pb and Cd were non-essential metals which their biological functions were unknown. The Estimated Daily Intake (EDI) of the marine mussels was lower than the oral reference dose (ORD) and low values of target hazard quotient (THQ < 1) had shown that the consumption of mussels containing heavy metals would not cause significant health risks to humans. The health risk assessment indexes showed low values, which meant insignificant health hazard. However, long-term exposure and the impact of consuming mussels containing heavy metals may require additional investigation

Banyuurip is one village in East Java that has successfully replanting its mangrove forest. Mangrove forest in Banyuurip had experienced losses due to changes into aquaculture and also abrasion from the Java Sea. However, with the concern and willingness of local fishermen who realized the loss of mangrove brought significant impact to their fish catching, mangrove replanting was carried out since 2007. This effort went well because they did the seedling process by themselves. Seedling process in Banyuurip is dominated by mangrove Avicennia sp and Rhizophora because these mangroves are found in high numbers in Banyuurip. Seedling is carried out using polybag and the germination was conducted in an area called ‘bedengan’ to protect the seeds from the sun. The seeds are watered using water pump regularly and supervision is conducted to prevent the seeds from being eaten by crab. At present, mangrove seedling in Banyuurip is running well and the seeds are either used by themselves or are selling to another mangrove places.