Aba (float) - Aba (English spelling) buoy

Japanese: あば(浮子) - あば（英語表記）buoy

To keep fishing nets in the required shape underwater, it is usually necessary to balance the upward and downward forces of buoyancy and gravity. The buoyancy required for this is achieved using ridges, also called uke or ukashi. First of all, it is necessary for the ridges to be large, but it is also desirable that the buoyancy does not change as much as possible as a result of the passage of time underwater, such as absorbing water or being deformed by water pressure. It is also desirable for the ridges to be easy to process and to be supplied in large quantities at low cost. In the past, paulownia wood was considered the best, and other woods such as bamboo, cork, pine, and cedar were used, but these had problems with water absorption.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

網漁具を水中で所要の形状に保たせるには，通常，浮力と重力という上下に働く力をうまくつり合わせる。このとき要する浮力を得るのに用いられるのがあばで，うけ，うかしなどともいう。あばの大きいことがまず必要だが，水中にあって時間がたつとともに吸水したり，また水圧で変形したりして浮力が変化することがなるべく少ないのがよい。また加工が容易で，安価に大量に供給されるものが望ましい。昔はキリを第1等とし，タケ，コルク，マツ，スギなどの木材を用いたが，吸水の面で問題があった。

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