Abstract
Striped catfish tetraploid induction through heat shock that carried out in this study is not intended to produce on growth fries.But to form a broodstock to produce triploid on growth fries through cross breeding without any physical shock induction process.The fries from the heat shock induction in the previous study were screened or selected by observing the maximum number of nucleoli in fin cells.The number of tetraploid individuals used in the performance test was 105 which were placed in three different concrete tanks.The results showed that the growth of tetraploid striped catfish was more significant than diploid with a difference in the daily weight percentage about 0.497% and 0.158% for length but insignificant differences in FCR and SR.In gonadal development based on histological observations, it was shown that each tetraploid and diploid both male and female striped catfish were at the same level of gonadal maturity.Female gonads were at the previtellogenic oocytes and vitellogenic oocytes, but males are dominated at the stage of spermatocytes and spermatozoa.This histology also shows us that the female gonad was still at the development stage, while the male had entered the mature stage and ready to be spawned.
Highlights
Striped catfish tetraploid induction through heat shock that carried out in this study is not intended to produce on growth fries.But to form a broodstock to produce triploid on growth fries through cross breeding without any physical shock induction process.The fries from the heat shock induction in the previous study were screened or selected by observing the maximum number of nucleoli in fin cells.The number of tetraploid individuals used in the performance test was 105 which were placed in three different concrete tanks.The results showed that the growth of tetraploid striped catfish was more significant than diploid with a difference in the daily weight percentage about 0.497% and 0.158% for length but insignificant differences in FCR and SR.In gonadal development based on histological observations, it was shown that each tetraploid and diploid both male and female striped catfish were at the same level of gonadal maturity.Female gonads were at the previtellogenic oocytes and vitellogenic oocytes, but males are dominated at the stage of spermatocytes and spermatozoa.This histology also shows us that the female gonad was still at the development stage, while the male had entered the mature stage and ready to be spawned
Seasonal changes in plasma levels of steroid hormones in an asynchronous fish the gudgeon Gobio gobio (Teleostei, Cyprinidae)
Summary
Budidaya ikan patin siam berkembang di Indonesia saat mulai ditemukannya teknik produksi masal benih melalui induksi hormonal pada tahun 1980. Dari beberapa produk patin tersebut, patin fillet merupakan produk target bagi para industri produk perikanan dikarenakan memiliki peluang ekspor guna mendapatkan nilai tambah dan sumber devisa negara (Ikasari dan Suryaningrum 2015; Suhendra et al 2017). Adapun cara yang efektif untuk memproduksi massal benih steril tersebut yaitu dengan memijahkan ikan tetraploid dengan ikan diploid. Hal ini telah dibuktikan oleh Arai (2001) dengan memijahkan ikan rainbow trout tetraploid dengan diploid untuk menghasilkan 100% ikan triploid yang bersifat steril. Pengamatan perkembangan gonad ini dilakukan setiap 3 bulan dimulai pada umur 1 tahun setelah menetas hingga ikan tersebut mencapai tingkat kematangan gonad sempurna dan siap untuk dipijahkan. Ini dilakukan untuk mengetahui umur berapa ikan patin tetraploid tersebut matang gonad pertama dibandingkan dengan ikan patin diploid sebagai standar acuan perkembangan gonad
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