Nudibranchs are marine invertebrates from the mollusc phylum of the gastropod class subclass Opisthobranchiata. Nudribanch has many benefits because of its compound content, has the beauty of attractive colors as an underwater tourism photo object, and can be used as biota indicators of ecosystem health. The purpose of this research is to assess density, diversity index, Evenness index, and dominance index as well as water parameters that support the growth and development of nudibranchs in Humbolt Bay, Jayapura City. The research method used is the Underwater Visual Census (UVC) method at a depth of 5 m and 10 m with an observation width of 2.5 to the right and to the left along 100 m. The results showed that there were 14 types of nudibranchia with 122 individuals, with the dominant species being Phyllidiella pustulosa and Phyllidia varicosa. The density of the nudibranch is quite low, which is around 0.022-0.036 individuals / m2, the Diversity Index is low, which is around 1.228-1.463, the Uniformity Index is classified as a small population, 0.120-0.260 (close to 0), and the Dominance Index is quite stable, namely 0.270-0.402. Based on water parameter data It was found that the waters and habitats in Jayapura City's Humbolt Bay are under pressure as indicated by the decline in the quality of the ecosystem, but are still in normal conditions that support the growth and development of marine life, especially nudibranchs.
Fisheries resources, especially small-scale fisheries in the Depapre Bay, Jayapura Regency, which is quite potential, have not been utilized optimally. However, the damage to supporting ecosystems has begun to occur. The aims of this study were to inventory the target fish resources, study the pattern of the fishing season, and determine the fishing ground area in the Depapre Bay in a participatory manner. The method approach used in this study is a semi-structured study to document and evaluate small-scale fisheries management systems in a participatory manner with several data collection techniques, namely with focus group discussions, in-depth interviews, and recording and documentation. There are around 14 target fish families in the Depapre Bay that have been identified, which are grouped into pelagic fish and demersal fish. The pelagic fish group of the Scrombidae family has a fishing season of around May-November, namely in the east to the west season with the fishing ground outside the bay, while the demersal fish group generally has a fishing season of around May-February or occurs from the beginning to the end of the western season with the fishing ground in the bay and around Tanjung Tanah Merah, which is caused by the physiographical and oceanographical factors of the Depapre Bay. Considering the above conditions, it is necessary to pay attention to stakeholders, especially the local government. In addition to the community empowerment to improve technology, the limited reach of fishermen should also be taken into consideration. Conservation zoning should be based on the fishing ground areas by paying attention to the existing the Tiaitiki local wisdom system.
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