Pola Pertumbuhan dan Reproduksi Ikan Mujair Oreochromis mossambicus (Peters, 1852) di Waduk Cincin, Jakarta Utara

Abstract

Ikan mujair Oreochromis mossambicus (Peters, 1852) adalah salah satu ikan tawar yang memiliki tingkat toleransi yang sangat luas terhadap salinitas (euryhaline), sehingga dapat hidup dengan baik di perairan payau. Ikan ini termasuk salah satu spesies asing yang masuk ke perairan Indonesia. Penelitian ini bertujuan untuk mengkaji pola pertumbuhan dan reproduksi ikan mujair. Pengambilan sampel dilakukan selama tiga bulan (Juni, Oktober 2021 dan Mei 2022) di Waduk Cincin, Jakarta Utara. Total ikan contoh yang tertangkap selama penelitian sebanyak 563 ekor ikan, terdiri atas 409 ekor ikan jantan dan 154 ekor ikan betina dan nisbah kelamin 1:0,4. Kisaran panjang total ikan tertangkap sebesar 71-166 mm dengan pola pertumbuhan alometrik negatif. Faktor kondisi ikan mujair berkisar 0,9672-1,0390. Individu matang gonad paling banyak ditemukan pada Oktober 2021 ketika musim penghujan. Ukuran pertama kali matang gonad ikan mujair jantan pada 112 mm dan betina pada 116 mm. Potensi reproduksi diperkirakan berjumlah 20–846 butir telur dengan tipe pemijahan partial spawner.

Mozambique tilapia Oreochromis mossambicus (Peters, 1852) is one of the freshwater fish that had a very wide tolerance level to salinity (euryhaline), so it could live well in brackish waters. This fish was one of the foreign species that entered Indonesian waters. This study aimed to assess the growth and reproduction patterns of tilapia. Sampling was conducted for three months (June, October 2021 and May 2022) in Cincin Reservoir, North Jakarta. The total number of sample fish that had been caught during the study was 563 fish, consisted of 409 male and 154 female fish with a sex ratio of 1:0.4. The total length range of fish captured was 71-166 mm with a negative allometric growth pattern. The condition factor of mozambique tilapia ranged from 0.9672-1.0390. The frequency of mature fish was highest in October 2021 during the rainy season. Size at first gonad maturity of male mozambique tilapia was 112 mm and female was 116 mm. Reproductive potential was estimated at 20-846 eggs with a partial spawner spawning type.