The world's coral reefs are under increasing pressure due to local and global triggering factors (e.g., acidification, pollution, plastic waste, rising temperatures, and wastewater) that degrade the condition and function of coral reefs. These pressures have the potential to cause drastic changes in coral reefs, such as a "shift to the algal phase," in which Scleractinia coral-dominated communities "switch" to macroalgae-dominated communities or less productive algal grasses. The purpose of these research consists of to identify comprehending the influence of variables influencing fish community dynamicsand figuring out the mechanisms that give corals and reef fish resilience in the face of change. The collecting data need two months of fieldwork, conducted in 2023, beginning in October and finishing in November 2023. The study location is Lihaga Island in the North Minahasa Regency with the focus of research is coral ecosystems. The underwater photo transect method, also known as the Underwater Photo Transect (UPT) method, utilizes advancements in computer software and digital camera technology. A roll-meter was placed 50 meters away from each site, and 50 images were taken at each station. Reef fish data was obtained from the results of research conducted by 37 people on Lihaga Island, North Sulawesi. This publication specifically uses data on reef fish that are targeted for fishing and has not been published before. The method used was the underwater visual census method on the belt transect. Visual censuses were conducted by divers along a 50-meter transect line with left and right-side widths of 2.5 m each, resulting in a census area of 250 m2 per transect. The study of the coral cover at Lihaga Beach revealed that the cover value of dead coral groups was about 40.32%, that of living coral groups was approximately 38.58%, and that of other groups (OT) was approximately 21.11%.: Coral lifeform types ACB, CMR, HA, ACD, CA, ACE, ACT, CF, DC, ACS, SC, CE, SP, OT, CS, and CM forms are what define Group 1. DCA and S are characteristics of Group 2. ACB, CMR, HA, ACD, CA, ACE, ACT, CF, DC, ACS, SC, CE, SP, OT, CS, and CM are the characteristics of Group 3. Group 2 is distinguished by S and DCA. HA, ACD, CF, DC, ACS, SC, CE, SP, OT, CS, CM, DCA, and S are the characteristics of Group 3. CB and RB make up Group 4. Every one of the four sizable groupings has a certain function or portion within an ecosystem. The results of the analysis showed that the uniformity value (E) of reef fish on Lihaga Island was included in the stable category with a value of 0.79 or included in the > category with a value of 0.75. The results of the reef fish cluster analysis (target group) are divided into 3 major groups, namely, the first group consists of Zebrasoma scopas and Parupeneusmultifasciatus. The second group is of the type Ctenochaetus striatus. The third group of Ctenochaetusbinotatus species, which has the greatest value of all target fish species, represents two observation stations on Lihaga Island. The large number of fish species, Ctenochaetusbinotatus and Ctenochaetus striatus, which became the largest group based on the results of this cluster analysis
