CRYOPRESERVATION OF SPERM IN MARINE FISH

M. Suquet, C. Dreanno, C. Fauvel, J. Cosson, R. Billard-2000

Aquaculture Research, 31 (3): 231-243

Abstract:

Since the first work of Blaxter in 1953, fish sperm cryopreservation has been attempted on about 30 marine species. The present paper reviews the techniques used and the results published in these species. Particular attention is paid to the handling procedure of sperm before freezing, the problems of semen ageing and semen contamination with urine. The quality frozen-thawed semen was evaluated using previously standarized biotests, such as a two-step motility activation technique adapted for the different species and fertilization assays using a discriminating insemination technique. Most extenders used in marine fish are saline or sugar solutions. From the investigated cryoprotectants, dimethyl sulphoxide (DMSO) generally leads to the best results. Cooling rates range from 8 degrees C tot 99 degrees C/min; the thawing rate is generally high. Compared with freshwater species, a high percentage of spermatozoa survives cryopreservation.

Therefore, and because of the simplicity of the techniques, the cryopreservation of marine fish sperm is suited for application in aquaculture.

(IFREMER, Laboratoire de Physiologie des Poissons, BP70, 29280 Plouzané, France)

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