숭어 정액의 종묘생산시 인공수정과 정액의 냉장 및 냉동보존에 대한 적합한 희석액을 찾고자 정액의 성상과 정자의 운동활성을 조사하였다. 숭어 정자의 농도는 $1,11 pm0.36 imes10^{10}/ml$, spermatocrit는 96.7$pm$2.6이었고, 정 장의 삼투질농도는 370$pm$6 mOsm/kg, pH는 7.8$pm$0.1이었다. 정액과 인공해수의 희석비율이 1 : 10일 때 정자의 운동성이 높았으나 20분 후에는 낮아졌으며, 정장의 삼투질농도 보다 약간 높은 인공해수 (482 mOsm/kg)에서 정자의 운동성이 오랫동안 높게 지속되었다. 또한 정장의 pH 값과 비슷한 pH 7$~$9에서 정자는 활발하게 움직였다.
Experiments were performed to find out the physico-chemical properties of milt and the sperm motilities in various conditions using the grey mullet, Mugil cephalus. The average concentration of sperm in the milt was $1,11 pm0.36 imes10^{10}/ml$. Spermatocrit was 96.7$pm$2.6. pH and osmolality of seminal fluid were 7.8$pm$0.1, 370$pm$6 mOsm/kg, respectively, Total protein concentration of sperm was higher than that of seminal fluid, but total lipid concentration of seminal fluid was higher than that of sperm. The sperm motility was high in the diluent of milt : artificial seawater (1:10, by volume) and in 822 mOsm/kg and 983 mOsm/kg similar to seawater osmolality, but it decreased after 20 minutes. But activity of sperm was highly maintained in 482 mOsm/kg which was a little higher than osmolality of seminal fluid, and was high in pH 7$~$9.
