This is a high-throughput sperm cryopreservation protocol for zebrafish. Sperm cryopreserved using this protocol has an average of 25% fertility in subsequent vitro fertilization and is stable over many years.
Draper, B. W., Moens, C. B. A High-Throughput Method For Zebrafish Sperm Cryopreservation and In Vitro Fertilization. J. Vis. Exp. (29), e1395, doi:10.3791/1395 (2009).