To cite package ‘hatchR’ in publications use:

  Sparks M, Maitland B, Felts E, Swartz A, Frater P (2025). “hatchR: A
  toolset to predict when fish hatch and emerge.” In preparation.

A BibTeX entry for LaTeX users is

  @Unpublished{,
    title = {{hatchR}: A toolset to predict when fish hatch and emerge},
    author = {Morgan M. Sparks and Bryan M. Maitland and Eli Felts and Allison Swartz and Paul Frater},
    year = {2025},
    note = {In preparation},
  }