Sex Reversal on Congo Tetra Fish (Micraleptus intterruptus ) Larvae

Abstract

<p class="MsoBodyText2" style="line-height: normal;"><span style="font-size: 10pt;" lang="in" xml:lang="in">ABSTRACT<br /></span></p><p class="MsoBodyText2" style="line-height: normal;"><span style="font-size: 10pt;" lang="in" xml:lang="in">Experiment was performed to assess the effect of 17</span><span style="font-size: 10pt; font-family: Symbol;" lang="in" xml:lang="in"><span>a</span></span><span style="font-size: 10pt;" lang="in" xml:lang="in">-methyltestosterone (MT) treatment on Congo tetra fish larvae.<span>  </span>To evaluate the optimal pattern of MT treatment, three different treatments were administrated.<span>  </span>Three months old larvae were submerged in three different doses of MT; 1, 2 and 4 mg/l.<span>  </span>These studies showed that the highest percentage of male fish was obtained by 4 mg/l MT treatment, 87,17%.<span>  </span>The 2 mg/l and 1 mg/l MT treatments obtained 77,53% and 69,86% male respectively, two times higher than control, 38,96%.<span>  </span>On the other hand, the 4 mg/l MT treatment also resulted the highest percentage of hermaphrodite fishes, 17,58%.<span>  </span>The highest survival rate was shown by 1 mg/l MT treatment, 62,77% and the lowest was shown by the 4 mg/l MT treatment, 47,20%.<span>  </span>The highest rate of fish length and weight was shown by the 4 mg/l MT treatment, 4,4 cm and 1,65 gram respectively.<span>  </span>These findings suggest that MT treatment offers an advantage in growth of <span> </span>tetra Congo larvae. </span></p><p class="MsoBodyText2" style="line-height: normal;"><span style="font-size: 10pt;" lang="in" xml:lang="in">Key word :<span>  </span>Sex reversal, methyltestosterone, Congo tetra fish, <em>Micraleptus intterruptus.</em></span></p><p class="MsoNormal"><span lang="in" xml:lang="in"> </span></p><p class="MsoBodyText" style="text-align: center;" align="center"><span style="font-size: 10pt;" lang="in" xml:lang="in">ABSTRAK</span></p><p class="MsoBodyText" style="text-align: justify;"><span style="font-size: 10pt;" lang="in" xml:lang="in">Penelitian ini bertujuan untuk mengetahui pengaruh perendaman larva di dalam larutan hormon 17</span><span style="font-size: 10pt; font-family: Symbol;" lang="in" xml:lang="in"><span>a</span></span><span style="font-size: 10pt;" lang="in" xml:lang="in">-metiltestosteron pada dosis 1, 2 dan 4 mg/l larutan.<span>  </span>Persentase tertinggi ikan jantan dihasilkan<span>  </span>oleh perlakuan 4 mg/l, yaitu 87,17%.<span>  </span>Perlakuan 2 mg/l dan 1 mg/l masing-masing menghasilkan 77,53% dan 69,86% sedangkan kontrol menghasilkan 38,96% jantan.<span>  </span>Efek lain dari perlakuan MT ini adalah hermafroditisme.<span>  </span>Perlakuan 4 mg/l menghasilkan persentase hermafrodit tertinggi yaitu 17,58%, sedangkan pada kontrol kelangsungan hidup tertinggi diperoleh pada perlakuan 1 mg/l (62,77%) dan terendah pada perlakuan 4 mg/l (47,20%).<span>  </span>Hasil tersebut menunjukkan adanya pengaruh dosis hormon terhadap kelangsungan hidup ikan.<span>  </span>Pengukuran bobot dan panjang ikan pada setiap perlakuan menunjukkan nilai tertinggi dihasilkan oleh perlakuan 4 mg/l<span>  </span>yaitu 1,65 gram dan 4,40 cm.<span>  </span>Hal ini diduga bahwa hormon MT merangsang pula pertumbuhan ikan.</span></p><p class="MsoBodyText2" style="line-height: normal;"><span style="font-size: 10pt;" lang="in" xml:lang="in">Kata kunci :<span>  </span>Pergantian kelamin, metiltestosteron, ikan tetra Kongo, <em>Micraleptus intterruptus.</em></span></p>