Chromosome numbers of fishes, 1
J.J. Scheel, and A.O. Gyldenholm


In 1974 J.J. Scheel, along A.O. Gyldenholm with published "Chromosome numbers of fishes, 1." enumerating the karyotypes of hundreds of fish, may of them killifish. Here's a link to this the first time information about killifish karyotypes was ever published.