When targeting tuna, the depth at which you should fish can vary based on several factors including the species of tuna, water temperature, and time of year. Generally, tuna can be found at depths ranging from 50 to 300 feet. However, during warmer months, they tend to be closer to the surface, often around 20 to 50 feet, especially when chasing schools of baitfish. In cooler months, they may dive deeper, so it's important to adjust your depth accordingly.

Using a fish finder can help you identify the best depths based on where schools of tuna are located. Additionally, consider the following tips:
- **Trolling**: When trolling for tuna, set your lures at multiple depths to find where the fish are biting. A good starting point is to have some lines at 20 feet, others at 50 feet, and a few deeper at around 100 feet.
- **Chumming**: If you're chumming, try to keep your bait at varying depths to attract tuna from different levels in the water column.
- **Seasonal Movements**: Keep in mind that tuna migrate and their depth preferences can change with the seasons, so research local patterns before heading out.

Overall, being adaptable and using tools like depth finders and observing the conditions will greatly improve your chances of a successful tuna fishing trip!

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Topics covered in this question:

Sport Fishing Techniques Tuna Fishing Fishing Depths