Coral reefs and seagrass beds habitats are playing an important role for the reef fishes of where the connection of these two habitats will guarantee fish survival at various stages. Bahoi village is located at Minahasa Utara, has a special area to protect fish habitat called Marine Sanctuary. People are starting to realize the importance of the protection of fish habitat, due to an increase in the catch as well as a tourist attraction. The purpose of this study is to assess the habitat connectivity by type, size and abundance of fish in coral reefs and seagrass beds. The method used was Underwater Fish Visual Census (UVC) by observing the reef fish were found along the transect line to record the species of fish in a radius of 2.5 meters on the left and right along the transect line along 50m. The analysis of family types, showing that the family Siganidae is most commonly found in both habitats. For the length frequency of fish, fish with a size less than 5cm more common in seagrass habitats, whereas in coral reef habitats are found fish sized 5-10cm, 11-16cm and more than 23cm. Based on diversity, evenness and dominance indexes (atau bisa indices, atau tunggal index) composition, it was shown that the community structure of reef fishes is stable, while the seagrass habitat showed high diversity and has high levels of dominance at some station.
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