One easy way to get gems is to complete achievements. One of the achievement missions is the mission to catch large fish with a minimum size of 100 cm. There may be players who have difficulty getting 100cm big fish because they are nervous when they see XL and XXL sized shadows.
An easy way to catch big fish for nervous players is to catch a fish that is 100cm in size but has an M or medium sized shadow. Examples of large fish with an M shadow include samson, mahimahi, yellowfin tuna and humphead wrasse. These fish can be found throughout the day in the deep sea.
These fish are uncommon and rare, so it’s not difficult to catch them if you use a pro rod, golden rod.
After the catch 100 cm fish mission is complete, the mission to catch 1000 cm and 2000 cm fish will be continued. 1000 cm fish such as giant squid (giant squid) in blue hole, sprm whale (blue hole and ship), blue whale (lighthouse), oarfish etc. Blue whales can reach 2000 cm.