To cite deltafish in publications use:

  Clark J, Bashevkin SM. 2022. deltafish: an R package to access an
  integrated dataset of fish counts and lengths from the San Francisco
  Estuary v0.1.0. Zenodo. doi:10.5281/zenodo.6484440

A BibTeX entry for LaTeX users is

  @Article{,
    title = {deltafish: an R package to access an integrated dataset of fish counts and lengths from the San Francisco Estuary v0.1.0},
    author = {Jeanette Clark and Samuel M Bashevkin},
    journal = {Zenodo},
    year = {2022},
    url = {https://zenodo.org/record/6484440},
    doi = {10.5281/zenodo.6484440},
  }

  Bashevkin SM, Gaeta JW, Nguyen TX, Mitchell L, Khanna S. 2022. Fish
  abundance in the San Francisco Estuary (1959-2021), an integration of
  9 monitoring surveys. ver 1. Environmental Data Initiative.
  doi:10.6073/pasta/0cdf7e5e954be1798ab9bf4f23816e83.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {deltafish: an R package to access an integrated dataset of fish counts and lengths from the San Francisco Estuary v0.1.0},
    author = {Samuel M Bashevkin and Jereme W Gaeta and Trinh X Nguyen and Lara Mitchell and Shruti Khanna},
    journal = {Environmental Data Initiative},
    year = {2022},
    url = {https://doi.org/10.6073/pasta/0cdf7e5e954be1798ab9bf4f23816e83},
    doi = {10.6073/pasta/0cdf7e5e954be1798ab9bf4f23816e83},
  }