This study aims to determine the distribution patterns, and environmental parameters of macro algae waters in the Intertidal Zone of Malang Rapat waters Gunung Kijang District, Bintan Regency. This research was conducted in October-December 2019. The purposive sampling method was applied to 5 research station based on the different characteristics of each station that found macro algae. Macro algae sampling was carried out at each observation station using line transects. Placing transect lines at every station to collect 3 macro algae along 50 m, the determination of the first plot is based on the first point of finding macro algae that are drawn perpendicular to the coastline with a distance between the lines of 30 m. The results found 8 species of macro algae (seaweed) from 3 divisions namely Caulerpa serrulate, Halimeda opuntia, Chaetomorpha crassa, Sargassum polycystum, Sargassum cristaefolium, Padina australis, Gracilaria salicornia, Galaxaura fastigiate. Distribution patterns of macro algae in the waters of Malang Rapat between -4,212 - 1,708 with the category grouping at station 1 and equivalent at station 2, 3, 4, 5. Each station is dominated by brown algae with the genus Sargassum. Factors affecting the distribution of macro algae in intertidal zone are lights, temperature, pH, current and substrate. All water quality parameters fulfilled the optimum growth requirements of seaweed.

The aim of the study was to determine the ecological potential and pattern of the distribution of sea cucumbers in the waters of Tanjungkeramat, Pangkil Village, Teluk Bintan District, Bintan regency. This study uses a survey method, determining the area with a swap area method of 4 areas, measuring the area using a meter with a length and width of 100 x 50 m. The results of the study found 2 types. Sea cucumber from the subfamily namely Holothuriidae and Stichopodidae. The highest density of Holothuroidea species in area I is 46 individual/ha. The lowest density is in area IV which is 12 individual/ha. Sea cucumber density in Tanjungkeramat is still relatively good. The water conditions in Tanjungkeramat still meet the quality standards that support the life of sea cucumber. Distribution pattern in area I with Id value 0.69, area II with Id value 0.68, and area III with a value of 0.42 has an even distribution pattern, while the distribution pattern in area IV Id 1.00 has a random distribution pattern.