The Best Depths for Big Fish in the Gulf of Thailand

Depth decides destiny. In the Gulf of Thailand, the difference between 30 and 80 meters can mean the difference between small reef fish and 50 kg tuna. Around Pattaya, most coastal waters are shallow — barely 20–30 meters. That’s why Crystal Bay stands out as a deep-sea miracle.

The area’s unique underwater canyon system drops fast from 30 to over 80 meters, providing an ideal environment for pelagic species like tuna, cobia, and mackerel. The deeper layers hold cooler, oxygen-rich water, where baitfish thrive.

30–40 meters: Common zone for coral trout, red snapper, and smaller reef predators. Perfect for beginners and short trips.
50–70 meters: The magic zone — skipjack and yellowfin dominate. Most Tom Tuna Club tuna catches happen here.
70–85 meters: The true deep-water territory, where big fish roam. Experienced anglers target this depth for trophy tuna and cobia.

Understanding the layers of depth means understanding the sea’s heartbeat. Every meter tells a different story — and every drop of the line brings you closer to it.