Step 1: Identify the city of Nagasaki. Nagasaki is a major port city on the island of Kyushu in Japan.
Step 2: Determine its economic activities. While Nagasaki has a diverse economy including shipbuilding, it is historically and presently a very significant center for Japan's large fishing industry. It serves as a major base for fishing fleets and has extensive facilities for processing and distributing seafood, making it a prime example of a fishing port. It is not primarily an oil port or an entrepot port.