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Catching up with fish

Cuttlefish vol.2

What can we learn from this GPS fish finder screen?

Cuttlefish vol.2 When your boat is moving slowly, the bottom line remains the same, even though the bottom might change. At these times the “Bottom Discrimination” feature is especially effective.

This screenshot was captured while drifting along with the wind and at a speed of about 0.5 knots. To the left side of the screen you can see the chart plotter, and to the right the fish finder which displays 50 kHz to the left and 200 kHz to the right and finally an A-scope.

Fish finder screen explained

  • Water depth: 24.3 m
  • Bottom composition: sand, gravel
  • On the 50 kHz side of the fish finder, we can see echoes close to the seabed.

Cuttlefish usually inhabits coastal areas from depths of five down to sixty meters. They prefer a seabed consisting of sand and gravel, areas with drop offs or variations in structure. Cuttlefish love crustaceans which they feed on by either chasing slow moving prey or by remaining camouflaged and motionless until suitable prey comes within attacking distance. This way, cuttlefish also hunt and eat fish whenever it can.

When diving you will either see the cuttlefish swimming while rapidly changing colors, or you will simply not see it due to their excellent camouflage. Cuttlefish can mimic the color and structure of its surroundings, making detection exceedingly hard. Due to this behavior, finding cuttlefish directly with a fish finder is very hard. Your best option is to use the fish finder to search for areas which the cuttlefish is likely to prefer, and here you can use the “Bottom Discrimination” function in order to find out the seabed composition.


When fishing I make sure speed is visible on the plotter screen, here I was drifting at speeds below 0.5 knots.

When fishing for cuttlefish it’s very important to keep your position as much as possible. Even if you have turned off the engine, currents and wind might move your vessel to be able to efficiently fish for cuttlefish. Since cuttlefish usually stay stationary while waiting for suitable prey to come by, if your lure passes by too fast, the cuttlefish has no chance to attack it. You should never go faster than 0.5 knots (roughly 1km/h) when fishing for cuttlefish.

To find a good fishing spot for cuttlefish, you should utilize your GPS fish finder to search for suitable areas that the cuttlefish prefers, taking bottom composition into account with the “Bottom Discrimination” feature. Use the plotter function to keep track of your speed so that you’re not going too fast, and you’ll be sure to catch some cuttlefish.

  • Cuttlefish vol.2 Three cuttlefish were caught, these are all delicious when properly cooked.
  • Cuttlefish vol.2 Cuttlefish stay motionless on the seabed, waiting for suitable prey passing by.

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Writer introduction

Nobuaki Ono, FURUNO field tester.

DAIWA field tester, Writer at Boat Club, a monthly Japanese boating publication

Nobuaki is a hobby angler who travels around Japan together with his beloved car-top boat Tomoe-maru. With a keen interest in fishing as well as scuba diving, he has gained a substantial amount of knowledge in how to utilize fish finders to the fullest. Nobuaki regularly holds well-attended training courses in the use of fish finders, as well as being a proponent for proper sea manners and safety at sea. Sharing his knowledge is a passion for Nobuaki, and he manages his own homepage as well as being a sought after writer in Japanese boating publications.