One of the coastal ecosystems that have experienced a high level of degradation due to its utilization pattern which tends not to pay attention to its sustainability aspects is the mangrove forest in Rangsang District, Meranti Islands Regency, and Riau, Indonesia. Seeing the symptoms of mangrove forest destruction for various purposes, it is necessary to manage mangrove forests sustainably. To be able to carry out sustainable management of mangrove forests, management efforts are needed ber of strategic value and right. Management of community-based marine resources is one management strategy that can improve efficiency and fairness in the utilization and management of natural resources. The research aims to identify and analyze the condition of mangrove forests, reviewing mangrove forest management, and the development of community-based mangrove forest in the district of stimuli. The approach used in this study is an analytical descriptive approach with survey methods. This research was conducted in Rangsang sub-district, Meranti Islands regency, Riau. The results showed that the mangrove vegetation found included 7 species from 3 families, namely Avicenniaceae (Avicennia alba and Avicennia marina), Rhizophoraceae (Rhizophora mucronata, Rhizophora apiculata, Rhizophora stylosa, and Bruguiera gymnorrhiza) families, and Sonneratiaceae family (Sonneratia alba) , with the value of diversity index (H ') of mangrove vegetation in Rangsang sub-district at each station ranged from 0.91 to 1.69 and the environmental parameters of mangrove vegetation in Rangsang sub-district were obtained from clay sand, sandy clay and sandy clay; Soil pH ranges from 6.6-7.1; temperatures range from 29-31˚C; salinity ranges from 27-31 ppt; and organic matter content between 1.09-7.65. At the very least, there are three factors of decision making on community participation in mangrove forest management, namely management factors, knowledge factors and attitude factors. Meanwhile, mangrove forest management carried out by the community in Rangsang District in the form of rehabilitation, care and supervision. Therefore, in an effort to manage community-based mangrove forests active community participation is required by taking into account management factors, knowledge factors and attitude factors.

Carp cultivation has been going on for a long time in the Koto Panjang Reservoir and the type of Argulus ectoparasite in this fish culture has not been reported. This initial research study aims to identify the morphology and characterize the DNA of the Argulus species in this reservoir. This research can be used as initial information material for the management of aquaculture fish health and early warning against water quality degradation. Argulus surveys were carried out on carp parent cages with coordinate positions 0°16′46.7” North and 100°51”26.2” East. Argulus specimens were collected from live and dead carp bodies (body surface, gills, operculum, caudal fin, pectoral fin, anal fin, pelvic fin, base of tail, and abdomen) using a spatula and stored in 96% ethanol for identification using standard literature and DNA barcoding techniques. The research results obtained 115 specimens of the genus Argulus from 49 live goldfish (2800-4900 mm and 200-1800 g) and 3 goldfish that died ± 3-4 days which were characterized by white gills and white mucus lumps between the scales. DNA characterization revealed that the name of this fish lice species (Argulus) could not be determined and had a close relationship with Argulus japonicus Shizuoka-2019 with an identity value of 79.22%.

The needs of the archipelagic community to the land for the cultivation of prawn, and materials for the needs of building materials and charcoal mangroves resulted in the large number of mangrove trees that have transition allotment, from conservation land in coastal areas to residential areas, harbors, aquaculture, production forest to be used as a means of life others. That is what is experienced by mangrove in District of Kepulauan Meranti, Riau, Indonesia. The specific objective of this research is to measure the success rate of mangrove tree planting and mangrove tree growth rate in Tebing Tinggi island, Meranti Islands District. The research design used is exploratory research with quantitative approach. The Mangroves Reforestation Program conducted by the Government of District of Kepulauan Meranti together with the community on 28 October 2015 ago. Type of mangrove planted is Rhizophora mucronata. Determination of samples of mangrove trees was taken from several land areas by the survey plots in 10 locations in Tebing Tinggi island, Meranti Islands. Each plot is 3x3 m. Data collected in this research are primary data that is the number of live trees, tree height, number of leaves, leaf length, and leaf width. Collection data using survey method. Primary data obtained from field surveys are presented in the form of frequency tables and descriptions. Furthermore, the data is processed and analyzed descriptively. The results show that the success rate of mangrove trees planting reached 72%. This indicates that Rhizophora mucronata is an easy-living mangrove species in a wide range of habitats. Overall, the growth rate of mangrove trees shows good results, in terms of tree height, leaf number, leaf length, and leaf width.

No abstract

Meranti Islands Regency is a coastal area located in the cluster of Sumatra, Indonesia, right on the outskirts of the Malak Strait. The coastal area is known as a very good, fertile mangrove habitat, has a high carrying capacity as a living area for various aquatic organisms. The existence of mangrove ecosystems on the coast has a very large and beneficial effect on the life of fisheries resources, as well as beneficial for fishing fisheries due to the high productivity in the region. This study aims to obtain information and a clear picture of the development of fishing, and the correlation between the existence of mangrove ecosystems and productivity of fishing. This research uses the descriptive method based on regression and correlation analysis. Each type of data used in this study is primary data on observation and interviews, as well as secondary data on fishing and mangrove areas from the Ministry of Maritime Affairs and Fisheries, Forestry, and the Environmental Management Agency, Meranti Islands Regency. The Meranti Islands over a 15-year period experienced a completely increase or almost completely. Then, the mangrove ecosystem area has no significance that can influence and are closely related to the productivity of shrimp and shellfish in the area.

This study aims to analyze forest fires in Indonesia in

Research on the abundance of plankton in Tebing Tinggi Island waters ecosystem, Meranti Island District, Riau Province was conducted in March 2017. The observations focused on the phytoplankton and zooplankton communities at ten stations. The variations in the abundance of plankton on average between the location groups were 4428 to 1716224 cells/m 3 and 23938 individuals/m 3 (67.73%), respectively for phytoplankton and zooplankton. The structure of the phytoplankton community was observed to be dominated by 5 diatoms: Coscinodiscus, Chaetoceros, Guinardia, Navicula, and Pseudonitzshia species. However, the pre-dominant genus (>10%) was Coscinodiscus spp. with an abundance of 664,665.97 cells/m 3 (99.47%) at station 5. Of the dinoflagellate group, only Ceratium clans were with the highest abundance in station 7 of 324609 cells/m 3 with the location to the north of the Black Water Strait, but still in normal condition. The macroplankton community structure is dominated by the copepods group especially Calanoida, Cyclopoida and Nauplius copepods with high densities of more than 50%. On the other hand, information about the mangrove forest ecosystem and associated fauna in the ecosystem in the coastal area of Tebing Tinggi Island is still lacking. It is, therefore, necessary to conduct research that can be used as a basis to create a concept of management of marine resources in the region.

Pistia stratiotes are able to grow rapidly in culture medium given inorganic compounds. P. stratiotes cultured in a culture medium that has been given nitrates, phosphates and potassium (NPK) fertilizer. P. stratiotes cultured in a culture medium that has been given NPK fertilizer. A CRD with 5 concentrations of inorganic fertilizers tested, i.e. 0 (Co); 15 (T1); 20 (T2); 35 (T3); and 50 g / 10 L (T4). Observation of growth and decrease of the inorganic compound in culture medium was done 5 times, every 3 days. The results show that the best growth was identified in plants grown in T4. At the end of the experiment, 18.8 g BW with a daily growth rate was 17.9% of the baseline value of BW. On the 7th day of the experiment, the decrease was 0.187 mg / L (N) and 0.237 mg / L (P). So P. stratiotes were able to absorb relatively high N and P from water and use it for its growth.