One of the most exciting events that heralds the approach of autumn to anglers is the bonito migration. Descending in schools from the Black Sea into the Istanbul Bosphorus, this fish is the star of the season with both its abundance and its combative nature. So when exactly does the bonito migration begin, and how can you make the most of this period? In this guide we explain step by step.

The Logic of the Bonito Migration

The bonito is a migratory species that feeds and breeds in warm waters and makes great journeys during the seasonal transitions. All summer it fattens up in the nutrient-rich waters of the Black Sea. When the water temperature begins to drop, it moves south, toward the Marmara and the Aegean. This descent means the schools pass through the Istanbul Bosphorus, and that is exactly where the real opportunity lies for anglers.

When Does the Bonito Arrive?

The most frequently asked question is this: when does the bonito arrive? Giving an exact calendar would do nature an injustice, because the timing of the migration changes from year to year. Even so, the general trend is clear: with the late-summer cool-downs the first schools begin to be felt, and in the later weeks of autumn the passage intensifies. As the Black Sea bonito schools descend into the Bosphorus, their sizes also tend to grow steadily.

There are a few natural signs that show the migration has begun:

  • Falling water temperature: A marked cooling is the herald that the schools have set off.
  • Gull and bait-fish activity: Bait fish boiling at the surface and gulls diving onto them show that a predatory school is below.
  • Word from the shore: The first bonito caught along the Bosphorus are a sign that the passage is about to intensify.

The Timing and Spots of Bonito Fishing

When the bonito fishing time arrives, the most productive hours are generally the early dim light of morning and the late afternoon. The bonito is a fish that hunts near the surface and fast; that is why a moving lure and the right spot matter so much. Points to watch on the Bosphorus:

  • Current bands: The current corners where bait fish gather are the main stage on which the bonito hunts.
  • Surface boils: Sudden movement on the water surface and leaping bait fish show that the school is right below; the boat must approach without spooking the school.
  • Passage routes: The sections where the Bosphorus narrows and the current strengthens are the natural crossing points of the migration band.

Tackle and Bait

The bonito responds very well to bright, moving artificial lures. A general starting guide:

  • Spoon and jig: Metal lures that reflect light attract the bonito with a fast retrieve.
  • Trolling: Scanning a wide area with a lure drawn behind a slowly cruising boat is an effective way to find the school.
  • Leader strength: Given the bonito's sharp teeth, choose a sturdy leader.

When the strike comes, the bonito resists hard and suddenly; keeping the line taut and reeling in steadily is the key to not losing the fish.

A Bountiful but Variable Season

The best thing about the bonito season is that on some days the school practically explodes and the boat fills up in a short time. But the migration is variable; a spot that is bountiful one day can fall silent the next. So you need to watch the current water conditions, follow the gull and bait activity, and stay flexible. An experienced captain, by keeping a finger on the pulse of the school, makes a big difference in catching the right moment and the right spot.

Sustainable Fishing

In times of abundance, the bonito is fished with great appetite; but fishing only as much as you need and releasing very small individuals is important for the continuity of the seasons. A nature-respecting approach protects the bounty of both this year and the years to come.

Experiencing the bonito migration from a boat is one of the most unforgettable experiences of the season. If you would like to plan an outing timed to the migration period, you can review our fishing tours page and reach us via our contact page for suitable dates and details. With our team, who know the Bosphorus and the migration routes well, make the most of the bonito season.