Pattaya Fishing Park is the best park in Pattaya for Mekong catfish. The owner claims there are more than 3,000 fish in the pond. It’s accessible from Sukhumvit road along soi 62 or from soi Wat Boon, it’s signposted from Wat Boon soi 2. The fastest fishing is towards the far bank where the smaller fish tend to lie, 50m+ casts are needed to reach them. The larger fish are usually caught closer to the middle of the pond but by casting your bait there you will not catch as many fish. The largest Mekong I have seen come out of Pattaya Fishing Park was around 50kg, the owner claims it contains Mekongs up to 85kg.