Ciri ikan matang Gonad

By Rani Rehulina Tarigan

CIRI IKAN MARANG GONAD

 

Ciri kematangan gonad pada ikan
Pada ikan jantan
Menurut Setiawan (2009) ciri-ciri induk jantan lele dumbo jantan yang telah siap untuk dipijahkan sebagai berikut :
· Alat kelamin tampak jelas memerah
· Warna tubuh agak kemerah- merahan
· Tubuh ramping dan gerakannya lincah
Pada ikan betina
· Bagian perut tampak membesar ke arah anus dan jika diraba terasa lembek.
· Lubang kelamin berwarna kemerahan dan tampak agak membesar.
· Jika bagian perut secara perlahan diurut ke arah anus, akan keluar beberapa butir
telur berwarna hijau tua dan ukurannya relatif besar.
· Gerakannya lambat.
Selama proses reproduksi sebagian besar hasil metabolisme tertuju pada perkembangan gonad. Hal ini menyebabkan terjadinya perubahan dalam gonad itu sendiri. Umumnya pertambahan gonad pada ikan betina berkisar antara 10 sampai
25 % dari bobot tubuh Tang dan Affandi 2000 dalam Bijaksana (2012)
Faktor yang mempengaruhi kematangan gonad
Menurut Zairin (2003)di  alam ikan akan mengalami pematangan gonad setelah emndapat sinyal lingkungan yang tepat untuk pematangan Gonad. Sinyal-sinyal ini biasanya datangnya musiman. Didalam wadah budidaya sinyal-sinyal tersebut bisa hilang. Selain itu budidaya adalah aktivitas yang ingin terlepas dari musim. Bagi ikan-ikan yang bersifat musiman, pematangan goad di luar musim merupakan suatu keharusan.
Kinerja reproduksi merupakan suatu proses yang berkelanjutan pada ikan akibat adanya rangsangan dari luar ataupun dari dalam tubuh ikan itu sendiri. Rangsangan tersebut dapat berupa rangsangan hormonal ataupun rangsangan lingkungan. Rangsangan hormonal yang terjadi pada induk ikan betina berbeda dengan induk jantan. Pada induk betina, rangsangan hormonal ditujukan untuk pembentukan telur dan pematangannya, sedangkan pada ikan jantan rangsangan tersebut untuk pembentukan sperma. ( Permadi, 2009 hal 17)
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