When autumn arrives, the bonito and its larger form, the torik, are among the first fish to stir in the Istanbul Bosphorus. The most classic and most enjoyable way to catch these fast, aggressive fish is trolling with a zoka, a heavy metal lure. Imitating a real baitfish in the water, the zoka almost draws the bonito schools to itself when it is chosen correctly. In this guide we cover the finer points of fishing with a zoka, the right lure choice for bonito and torik, and the secrets of trolling.

What Is a Zoka and Why Is It Effective?

A zoka is a heavy artificial lure made of metal that mostly imitates the shape and shine of a baitfish. When drawn through the water it reflects light and creates vibration, attracting predatory fish. Fish such as bonito and torik, which are sensitive to sight and movement and hunt in schools, instinctively attack this bright, moving object. The greatest advantage of the zoka is that it offers a natural imitation of prey without the need for live bait.

Choosing a Zoka for Bonito and Torik

Choosing the right zoka is the most critical stage of the trip. The size of the fish, the state of the water and the fishing depth all directly affect your choice.

Weight and Size

When choosing a bonito zoka, medium-weight lures close to the size of the baitfish the fish is hunting are generally preferred. As the fish grows larger, that is, when you reach the torik zoka stage, you need to move to larger and heavier lures, because the torik shows interest in deeper and larger prey. The weight also determines how deep the zoka will go and how steadily it will hold against the current.

Colour Choice

  • Bright and silver tones: On sunny, clear days they reflect light and are noticed from a distance.
  • Blue-green tones: As they imitate the natural colours of baitfish, they are a reliable choice in most conditions.
  • Dark and matte tones: In murky water or overcast weather they can be effective, as they sharpen the silhouette.

Keeping a few zokas of different weights and colours with you lets you experiment and find the most productive one for that day's conditions.

Trolling: The Zoka's Most Effective Method

The most common application of fishing with a zoka is trolling. In this method the zoka is released into the water behind a slowly moving boat, and as the boat moves the zoka cuts through the water like a real baitfish. Here are the key points for productive trolling:

  • Boat speed: It should be neither too slow nor too fast. The ideal speed is the one that makes the zoka move with a slight vibration, like a natural baitfish.
  • Length of line let out: The length of line released behind the boat is adjusted so the zoka runs at the desired depth. A longer line and a heavier zoka mean a deeper run.
  • Depth setting: The bonito usually roams near the surface while the torik can be found deeper, so it is important to try different depths.
  • Following the school: Movement on the surface and spots where birds gather give away the school's location. Trolling in these areas boosts your catch.

The strike on a zoka is usually hard and sudden; when the bonito attacks the lure you feel a distinct jolt on the rod. Reeling the fish in steadily prevents the hook from slipping out and the fish escaping.

Common Mistakes in Zoka Fishing

  • Sticking to a single zoka: It is hard to know which colour and weight is working that day without trying; variety is essential.
  • The wrong speed: Trolling too fast flings the zoka to the surface, while too slow makes it look lifeless.
  • A blunt hook: If the zoka's hook is not sharp, even a hard-hitting bonito can get away without being hooked.
  • Ignoring the school: Failing to follow the spot where the fish gather leads to wandering in vain.

The Right Guidance Multiplies Your Catch

Being in the right spot at the peak of the bonito and torik migration is the most decisive factor in the trip. With a captain who knows the currents of the Bosphorus, the migration routes of the fish and the ideal lines for trolling, you both learn the technique and increase your chances of a big catch.

If you would like to experience zoka trolling hands-on and enjoy the bonito season, you can head out to the most bountiful spots in the Bosphorus for a delightful day on the fishing tours we organise with our experienced crew.