Functions and features

The purposes for building the training ship Oshoro-maru V are to work on training and research regarding the fisheries sciences; to nurture human resources who can play an important role in this science field; to use for interchange of personnel and international collaborative research w ith domestic and foreign universities and research organizations; and to contribute to the reconstruction efforts of the fisheries industry that was devastated by the 2011 Tohoku earthquake and tsunami.

For these purposes of use, t he s hip has been designed and constructed as ” an ideal fishery training ship” that will be active for a long time and provide an environment for practice of world standard research and education.

The ship is also designed to s ucceed the high seaworthiness of the predecessor, Oshoro-maru IV, which had high sea-keeping and maneuvering performance, and furthermore, to have more sophisticated comfortability and ability for r esearch and training considering the environmental load reduction.

I. Basic Performance

Hull form and dynamic and static performance of the ship

  1. For the ship to have good propulsive and sea keeping performance, the height of the center of gravity was designed carefully, and a bulbous bow was adopted.
  2. A stern bulb was adopted to reduce the propeller-induced excitation force and the propeller cavitation.
  3. The hull form around the bow was carefully designed to suppress generation of air bubbles while sailing for t he underwater a coustic apparatus, which is arranged in the sonar dome intensively, and to exhibit good performance during the navigation for research and observation.
  4. The ship is equipped with a flap rudder and a bow thruster in order to improve the maneuverability at low-speed in the navigation for research and observation.

Reducing of the underwater radiation noise

  1. An electric propulsion system with two electric motors and one propeller was adopted.
  2. The propeller was designed to prevent cavitation from being generated in the navigation for research and observation at ship speeds less than 10 knots.
  3. The principle part of the hull structure is covered with v ibration damping material, and the electric generators are equipped with vibration isolating support.
  4. Low-noise type of auxiliary machinery and out fitting were chosen for the ship.

Improved living environment

  1. To reduce ship motion in rough seas, large bilge keels, anti-rolling tank and retractable fin stabilizers were installed.
  2. Adoption of the electric p ropulsion system much improves the silence characteristic.
  3. The living area was designed to acommodate female students and international researchers.
  4. The funnel was designed to prevent the smoke flowing over the exposed deck.

Propulsion and maneuvering system

  1. Two three-phase induction motors with two revolution speeds a s the electric propulsion motors give redundancy.
  2. Two of the three main diesel generators are generally used in the normal navigation considering easy maintenance.
  3. A joy-stick control system was installed to have various maneuvering modes with less operator’s work in the research and observation.

II. Instruments for fishing, research and surveys

Fishery facility

  1. The ship has a well deck like its predecessor, Oshoro-maru IV, for effective training of longline and driftnet fishing.
  2. The slipway in used for trawling, forms a part of the transom, and can be opened and closed with oil pressure.


  1. The ship is equipped with several exchangeable container-type laboratories for various research uses.

Instruments for research and observation

  1. Observations are carried out mainly on the port side, where equipment for research and observations is located for effective operation.
  2. The ship carries the latest s urvey instruments for m arine resources and oceanography such as a scientific echo sounder, a multi beam sonar, etc.

Measures for navigation in ice

  1. Preparing for navigation in northern areas, the hull structure, propeller, propeller shaft etc. were designed and manufactured based on the ice class IC.