The label on the can show a delightful slice of pink-fleshed fish steak, tastefully presented on a plate surrounded by parsely. Of course that's not what is actually inside.
Caravelle canned Jack Mackerel is pretty unexceptional stuff, as you would likely expect from such a basic bony fish. Somewhat coarse in texture, it's even more strong-tasting than the cheapest sardines, and each cut features a thick backbone (which is rendered soft by cooking.)
I don't actually buy this product for myself; I use it to supplement my dog Zim's supper. As he's gotten older, he's started to develop some arthritis in his hips. His vet has me putting fish oil and glucosamine caps daily in his food, and I add a chunk of mackerel to it both to hide the taste of the pills and give him the added benefit of the natural Omega-3s that are found in the fish.