The influence of temperature and salinity on catches of skipjack tuna (Katsuwonus pelamis) in Raja Ampat waters, Papua Indonesia

Salinity is a parameter that plays an important role in the marine ecological system. Salinity can be used to determine oceanographic characteristics, then it can be used to estimate the distribution area of ​​K. pelamis populations in a body of water. Measuring salinity is important in determining and recognizing water characteristics that are related to the presence of tuna. Still, salinity itself is not known to have a direct influence on the distribution of tuna. This research was conducted from February to May 2023 in the waters of Raja Ampat Sorong, West Papua to find out whether temperature and salinity influence the number of catches of K. pelamis. Data is taken directly by taking measurements using a thermometer and salinometer at the pole and line operating location. Data analysis uses simple linear regression by comparing the significance F value with the alpha value (0.05). After carrying out simple linear regression calculations using temperature and salinity data, significant F values ​​for temperature (0.655011187) and salinity (0.4627131) were obtained, and comparisons were made with the alpha value (0.05). Both significance F values ​​are greater than the alpha value so it can be concluded that temperature and salinity do not have a real influence on the number of catches.