This Golden Tile Fish was caught on the bottom (650 feet down). We were 90 miles from the Manasquan inlet on the edge of the continental shelf (the shelf slope). There is virtually no light down there and they live in holes that they excavate in the mud on the steep slopes.
If you look closely, you can see a rubbery appendage just anterior to the dorsal fin. They use this to attract fish to their mouth by waving it back and forth. Bioluminescent bacteria living symbiotically in their flesh light up in the dark, when they wiggle the lure, attracting fish in the dark.
We used 8 pound lead weights and big electric reels to get all the way down there (and back up). We used whole squid for bait. This 60 pounder was the biggest one we caught that day (yes, I caught it), we caught a total of about 100 of them!
This is a nice pair of small Bluefin tuna (called "Schoolies").
We catch them here in Jersey in the early summer (June-early July). They migrate through our area from the the Carolina coast on their way to their summer grounds near the "Great South Channel" which lies off the coast of Cape Cod Mass.
When we are lucky, there's enough forage (food) for them, which in the past few years has been Sand Eels (small slender baitfish that eat plankton). We catch them between 20 and 40 miles off the beach in spots where there are lumps on the seafloor. Usually this is like 100 feet deep.
What's really fun about them, is that they bite lures dropped to the bottom and reeled up really fast (diamond Jigs). And every once and a while you can hook a really big one (like 300 pounds) about once every few years, somebody brings in one around 800-1000 pounds (called a "Giant").