China Animal Husbandry & Veterinary Medicine ›› 2025, Vol. 52 ›› Issue (8): 3744-3752.doi: 10.16431/j.cnki.1671-7236.2025.08.023

• Genetics and Breeding • Previous Articles    

Establishment of Cryopreservation Methods for Fenneropenaeus chinensis Sperm and Investigation of Ultrastructural Damage

LIU Ying1, YU Chaoyong1, LIU Peng2, GAO Bei3, LI Zebang1, SONG Aihuan1, ZOU Yan1   

  1. 1. Marine Science Research Institute of Shandong Province, Engineering Laboratory for Exploration and Utilization of Marine Germplasm Resources of Qingdao, Shandong Key Laboratory of Intelligent Marine Ranch (Under Preparation), Qingdao 266104, China;
    2. Shandong Fisheries Development and Resources Conservation Center, Jinan 250013, China;
    3. Editorial Board of Periodical of Ocean University of China, Qingdao 266100, China
  • Received:2024-11-07 Published:2025-08-02

Abstract: 【Objective】 This study aimed to establish cryopreserving method of Fenneropenaeus chinensis and investigate the damage of sperm ultrastructure after cryopreservation. 【Method】 The sperm survival rate was detected by using eosin B staining.The suitable way was selected by comparing the effect of nine diluents (sterilized natural seawater,artificial seawater,decalcified artificial seawater,magnesium removal artificial seawater,de-potassic artificial seawater,5% sodium chloride,normal saline,D-Hanks and Hank’s balanced salt solution),three permeable cryoprotectants (DMSO,glycerol and propylene glycol),five non-permeable cryoprotectants(trehalose,glucose,maltose,vitamin C and bovine serum protein),four cooling procedures and four different resuscitation temperature (25,30,35 and 40 ℃),and the sperm ultrastructure was observed by transmission electron microscopy. 【Result】 ①The sperm survival rate after thawing of the sterilized natural seawater and artificial seawater groups were significantly higher than that of the other groups (P<0.05).②The sperm survival rate of the experimental groups using glycerol as the permeable cryoprotectant were significantly higher than that of the other experimental groups (P<0.05),with the best concentration being 15%.③The sperm survival rate after thawing of the experimental groups with the addition of non-permeable cryoprotectants such as trehalose and vitamin C were significantly higher than that of the other groups (P<0.05).④The sperm survival rate after thawing of the P-1 and P-2 experimental groups using slow cooling were significantly higher than that of the other groups (P<0.05),among which the P-1 experimental group with slow cooling from 0 ℃ to -20 ℃,medium-speed cooling from -20 ℃ to -80 ℃,and rapid cooling from -80 ℃ to -180 ℃ had the highest sperm survival rate.⑤The sperm survival rate after thawing of the 35 ℃ water bath thawing group was significantly higher than that of the other groups (P<0.05).⑥The normal rates of the cryopreservated sperms were 79%,structural damage of injured sperm was mainly manifested as spike lost,inter membrane space augmented,membrane swelled,acrosomal cap lost,vacuolization of the cell nucleus observed. 【Conclusion】 The optimal ultra-low temperature cryopreservation method for Fenneropenaeus chinensis sperm involves using sterilized natural seawater as the diluent,15% glycerol as the cryoprotectant solution,supplemented with 0.25 mol/L trehalose.By employing a programmable cooling device with a three-step slow cooling protocol and thawing the frozen sperm in a 35 ℃ water bath,this approach effectively minimizes structural damage to Fenneropenaeus chinensis sperm during ultra-low temperature cryopreservation.

Key words: Fenneropenaeus chinensis; sperm; cryopreservation; ultrastructure

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