Productivity Analysis of Fish Farming in Floating Net Cages in Lake Toba (Case Study in Pangururan Subdistrict, Samosir District, Indonesia)

Lake Toba has fishery potential that needs to be managed properly, one of which is the use of Lake Toba for fish farming with floating net cage systems. This study aims to analyze the productivity of carp and tilapia aquaculture on the floating net cages system in Lake Toba, Pangururan District, Samosir Regency, North Sumatra Province and what factors affect productivity, This research was conducted from June 2022 to January 2023 in Pangururan District, Samosir Regency, North Sumatra Province using the case study method. Respondents in this study were 60 carp and tilapia farmers. The data collected were primary data and secondary data. Data were analyzed using productivity analysis with Microsoft Office Excel 2010, while multiple linear regression analysis was analyzed using the 2019 minitab program. The results of the analysis show that the average value of carp productivity is 22.32 kg/m3/season, this value is higher than the value of tilapia productivity which has a value of 17.2 kg/m3. The results of multiple linear regression statistical tests obtained factors that affect the productivity of floating net cages carp farming on Lake Toba, Pangururan District, Samosir Regency, North Sumatra Province are feed and pond volume, while the factors that affect the productivity of floating net cages tilapia farming on Lake Toba, Pangururan District, Samosir Regency, North Sumatra Province are seeds, feed, pond volume, and age of cultivators.