Shells are a waste of crab (Portunus pelagicus) and green mussels (Perna viridis) waste in Karangantu. That is a problem for the environment with a large number. One solution is to use it as a raw material for chitosan. This study aims to see the potential of crab shells and green mussel shells as well as raw materials for chitosan biomaterials. This research used shell waste of P. pelagicus and P. viridis (3 replications). The stages of the method of this research include the preparation of raw materials, manufacture of chitosan, and analysis product. Parameters measured in this study include yield, moisture, ash, degree of deacetylation, and viscosity. The results showed that the yield, ash, and viscosity of green mussels shells were higher than that of crab shells, but the moisture and degree of deacetylation were lower. These results indicate that crab shells are better than clam shells, although the yield is lower as a potential for making chitosan from waste in Karangantu.

Microplastics are plastic particles <5mm from various sources. Fish contaminated by microplastics is a threat to food safety which microplastics contain toxicants. It is harmful to human health when consumed. Milkfish and Chub mackerel as consumption fish that can be easily found in some aquaculture ponds and marine water. The Previous study shows that microplastic content founded in the gill, stomach, and intestines. This study aims to determine microplastic content, microplastic abundance, and the correlation of organ weight with microplastic abundance in Milkfish and Chub mackerel. The methods used were descriptive qualitative. Milkfish and Chub mackerel samples were obtained from Rau Market, Serang City. The stages of the research carried with sampling, measuring, dissecting, dissolving, separating microplastic particles, filtering particles, and direct visual identification using a microscope. The results of the study found microplastics in the gills, intestines, and stomachs of milkfish and chub mackerel. In milkfish, most microplastic was found in the stomach (126 pieces), followed by the gill (111 pieces), and the intestine (65 pieces). While in chub mackerel, microplastics were mostly found in the gills (232 pieces, followed by the stomach (137 pieces), and the intestine (122 pieces). The types of microplastics found were fragments, films, and fibers. The number of microplastic types of fragments, films, and fibers with the colors of microplastics varied i.e. red, white, black, green, and yellow. There was no correlation between organ weight and microplastic abundance.