shoaling

/SH OW1 L IH0 NG/
verb
  1. 1

    To arrive at a shallow (or less deep) area.

  2. 2

    To cause a shallowing; to come to a more shallow part of.

  3. 3

    To become shallow.

    โ€œThe colour of the water shows where it shoals.โ€

verb
  1. 1

    To collect in a shoal; to throng.

    โ€œThe fish shoaled about the place.โ€

noun
  1. 1

    The formation of a shoal.

Source: https://en.wiktionary.org/wiki/shoal, https://en.wiktionary.org/wiki/shoaling