Blue Fish is the one of the most popular fishes from Istanbul Bosphorus. Approximately 1 lb package includes approximately 3-5 pieces of freshly arrived Lufer fish. Freshly Arrived, Kept Frozen. Bluefish is one of Turkish cuisine’s most common fish which has a heavy fat content, so it’s best when grilled or broiled. A brush of olive oil and some salt and pepper are all that’s needed to achieve a golden crust and wonderful flavor. You’ll find bluefish cooked the same way almost everywhere in Turkey. The fresher the fish the better. The best season for bluefish is August through December. The tastiest bluefish are said to come from the Bosphorus strait which runs through Istanbul, Turkey’s largest city, and connects the Black Sea with the Marmara Sea and Aegean Sea further South.