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Authors

Hesti Wahyuningsih
Muhammad Zairin Jr
Agus Oman Sudrajat
Ligaya ITA Tumbelaka
Wasmen Manalu

Abstract

Tor soro is an endemic species of freshwater fish in North Sumatera. Year by year the population of Tor soro tend to decrease. Currently,Torsorohashadtechnologyofdomestication. In order to support the success of breeding of Tor soro, information on the gonad development is urgently needed. Oocyte diameter and biochemistry of blood plasma of eight young females was carried out every month during a year (April 2009-March 2010). The estradiol-17p concentration was high received in July (0.9±0.8 ng ml'1), then decreased drastically in August (0.20±0.16 ng ml'1) and again increased until achieving the highest concentration in March.The highest of the estradiol-17p concentration correspond the peak of vitellogenesis towards the maturation. Biochemistry of blood plasma low in June as follow protein total 3.9±0.359 g dl-1; cholesterol 0.13±0.014 g dl-1; triglyceride 0.1±0.021 g dl-1 occurred at the time of the maximum size oocyte development. Concentration of low glucose existed in September (0.04±0.019 g dl-1) when the fish ovulated, this condition increased gradually up to optimal in February (0.12±0.003 g dl-1).Meanwhile optimal ovarian maturity occurred in June and September. AbstrakTor soro merupakan ikan endemik di Sumatera Utara dengan populasinya yang kian menurun. Saat ini, Tor soro telah mengalami teknologi domestikasi dan mampu dilakukan perbanyakan ikan pada kolam budidaya sejak tahun 2000. Informasi tentang reproduksi ikan ini masih sangat sedikit sehingga perlu adanya kajian tentang perkembangan gonad sebagai data awal pengembangan budi daya. Dalam studi ini digunakan delapan ekor betina muda. Pengukuran diameter oosit dan parameter biokimia plasma darah dilakukan sebulan sekali selama setahun (April 2009-Maret 2010). Konsen-trasi estradiol-17p yang tinggi diperoleh pada bulan Juli 2009 (0,9±0,8 ng ml-1), kemudian menurun drastis pada bulan Agustus 2009 (0,20±0,16 ng ml-1) dan kembali meningkat hingga mencapai konsentrasi tertinggi pada bulan Maret 2010. Tingginya konsentrasi estradiol-17p ini menunjukkan puncak vitelogenesis menuju maturasi. Hasil pengukuran biokimia plasma (total protein, kolesterol dan trigliserida, kecuali glukosa) yang rendah diperoleh pada bulan Juni 2009 (total protein 3,9±0,359 g dl-1; kolesterol 0,13±0,014 g dl-1; trigliserida 0,1±0,021 g dl-1) yang terjadi pada saat ukuran oosit mencapai maksimum. Konsentrasi glukosa terendah pada bulan September 2009 (0,04±0,019 g dl-1) saat ikan mengalami ovulasi, dan selanjutnya meningkat secara bertahap hingga mencapai optimal pada bulan Februari 2010 (0,12±0,003 g dl-1). Perkembangan kematangan gonad mencapai optimum pada bulan Juni dan September 2009.

Keywords:
plasma biochemistry , estradiol-17p , gonads , Tor soro.

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