The cryopreservation of spermatozoa of the burbot,Lota lota (Gadidae,Teleostei) |
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Authors: | Lahnsteiner Franz Mansour Nabil Weismann Thomas |
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Affiliation: | Institute for Zoology, University of Salzburg, Hellbrunnerstr. 34, 5020 Salzburg, Austria. franz.lahnsteiner@sbg.ac.at |
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Abstract: | The cryopreservation of spermatozoa of a teleost fish, the burbot, Lota lota (Gadidae) was investigated. Cryopreserved semen had the highest motility rate (46.6+/-8.0%, fresh semen control 86.5+/-8.2%) and fertility (78.1+/-2.7% embryo survival in hatching stage, fresh semen control 82.2+/-2.9%) when 10% methanol, 1.5% glucose and 7% hen egg yolk were used as cryoprotectants. Freezing was performed in 0.5-ml straws in the vapour of liquid nitrogen at 1cm above the level of liquid nitrogen and thawing in water at 25 degrees C for 20s. For optimal fertilization cryopreserved semen was first mixed with the eggs and then 25 or 50 mmol/L NaCl solution (pH 8.5) was added at a ratio of 1:24 (semen:saline solution). Under these conditions fertilization ratios in the range of fresh semen control were obtained at minimal sperm to egg ratios of 1.7 x 10(6):1. Fertilization with cryopreserved semen had no influence on the embryonic development, as the ratio of embryos which stopped development and the ratio of embryonic malformations were similar to fresh semen. |
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Keywords: | Cryopreservation Spermatozoa Burbot Lota lota Fish |
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