ABSTRAK
Penelitian kombinasi konsentrasi kuning telur sebagai krioprotektan belum pernahdilakukan pada ikan Botia (Chromobotia macrachanthus). Penelitian menggunakankonsentrasi kuning telur sebagai krioprotektan ekstraseluler dan metanol 10% sebagaikrioprotektan intraseluler. Konsentrasi kuning telur (0%, 5%, 7%, 9%, 11%, 13%, 15%,17%) dan penggunaan Carboxymethyl Cellulose (CMC) 1% terhadap motilitas,viabilitas dan abnormalitas spermatozoa ikan botia 24 jam pascakriopreservasi.Preservasi dilakukan pada tabung nitrogen cair dengan suhu -196°C. Berdasarkan hasiluji ANAVA satu arah menunjukkan pemberian berbagai konsentrasi kuning telurberpengaruh nyata (p<0,05) terhadap persentase motilitas, viabilitas, dan abnormalitasspermatozoa ikan Botia 24 jam pascakriopreservasi. Konsentrasi kuning telur optimumialah 15%, dengan nilai persentase motilitas (96,43 ± 1,49%), nilai persentase viabilitas(84,25 ± 1,26%) serta nilai persentase abnormalitas terendah (11,50 ± 1,29%). UjiTukey persentase nilai fertilitas telur 24 jam pascakriopreservasi tertinggi padakonsentrasi kuning telur 15% (50,64 ± 4,37%).

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ABSTRACT
The combination effect of egg yolk and 10% methanol on Botia fish spermatozoaquality and has not been performed, yet. Accordingly, the objrctive of study was: first,to evaluate the motility rate, viability rate, and abnormality of Botia fish spermatozoa 1day after cryopreservation. Second, to evaluate the fertility rate of Botia fish egg afterfertilized by cryopreserved sperm. The various concentration of egg yolk used were,5%, 7%, 9%, 11%, 13%, 15%, and 17% whereas the negative control (0%) used 10%methanol only without egg yolk. While, the positive of control used 1% of CMC. Botiasperm and egg were collected by hand stripping method. Physical and chemical ofbotia sperm had been observed by visual observation whereas the otility rate, vuiabilityrate, abnormality rate and fertility rate determined by light microscope. Botia fishsperm were mixed with cryoprotectand and extender before freezing at -196℃ (in LN).cryopreservation of botia fish sperm were conducted for one day. Based on one-wayANOVA test, gave the significant different between treatment group and control.Furthermore, according to Tuket test, they were gave the significant different (P<0.05)also among treatment group. Fifteen percent of egg yolk was optimum concentreationthat gave the highest motility rate, (96.43 ± 1.49%), and the highest viability (84.25 ±1.26%) and showed the lowest percentage of abnormality (11.50 ± 1.29%), and also thehighest fertility rate of Botia fish egg that (50,64 ± 4,37%) with protected by 15% ofegg yolk.