ABSTRAKSalah satu jenis ikan nila yang memiliki potensi nilai ekonomis yang tinggi dan dapat dibudidayakan di air tawar maupun di air payau adalah ikan nila merah. Dalam rangka pengembangannya diperlukan upaya untuk meningkatkan kualitas genetik di antaranya dengan cara seleksi. Kegiatan ini bertujuan untuk mengetahui estimasi nilai heritabilitas dan respons seleksi populasi jantan dan betina F-0 ikan nila merah hasil seleksi. Pemijahan dilakukan secara full-sib dengan perbandingan jantan dan betina 1:1 dan menghasilkan 10 famili dari 50 famili yang dibentuk. Pembesaran benih dilakukan di tambak bersalinitas 30 ppt menggunakan waring berukuran 3 m x 5 m x 1,5 m dengan padat tebar 10 ekor/m 2 . Seleksi calon induk pada populasi jantan dan betina ikan nila merah dilakukan setelah mencapai bobot 200-300 g. Cut off seleksi ditentukan pada bobot berkisar 225-354 g (jantan) dan 201-258 g (betina). Parameter yang diamati meliputi koefisien keragaman panjang dan bobot, diferensial seleksi, estimasi nilai heritabilitas, dan respons seleksi. Hasil penelitian menunjukkan koefisien keragaman karakter panjang pada populasi jantan berkisar dari 7,89%-11,18% dan bobot 21,22%-34,12% dengan diferensial seleksi 45,87-115,18 g; sedangkan populasi betina sebesar 6,08%-13,22% dan 16,39%-31,55%; serta 46,12-71,67 g. Hasil analisis estimasi nilai heritabilitas (dalam arti luas) pada karakter bobot ikan nila merah jantan 0,47±0,19 dan betina 0,19±0,11. Adapun prediksi respons seleksi yang akan diperoleh adalah 33,06 g (jantan) dan 11,65 g (betina). KATA KUNCI: heritabilitas, respons seleksi, ikan nila merah, payau ABSTRACT:Heritability estimates and response to selection of red tilapia in brackishwater pond.
Highlight ResearchThere has been a significant decrease in growth, condition factors, hepatosomatic index along viscerosomatic index with the length of time for feed restriction, although fasting for up to 28 days did not cause fish mortalityHematological parameters such as RBCs, WBCs, hematocrit, and hemoglobin decreased significantly, but after re-feeding increased significantly in consecutive timesThe blood glucose levels decreased during feed restriction and gradually increased after re-feedingFeed restriction fish gained weight continuously during re-feeding, but no displaying compensatory growthThe decrease in hematological parameters did not indicate stress levels in fish, but reflected a lack of nutrition condition AbstractThe management of red tilapia culture can be improved through restriction of feed. This study aimed to determine the impact of feed restriction time and re-feeding on the growth and hematological performance of juvenile red tilapia. This study used an experimental method with a completely randomized design consisting of five treatments with four replications, namely the fish were given food for 28 days (A), 7 days of feed restriction followed by 21 days of refeeding (B), 14 days of feed restriction followed by 14 days of refeeding (C), 21 days of feed restriction followed by 7 days of refeeding (D) and 28 days of feed restriction (E). The parameters observed were growth, biometry, and hematological values. The results showed that during the feed restriction period there was a significant decrease in growth, condition factors, hepatosomatic index along with viscerosomatic index with the length of time for feed restriction, although fasting for up to 28 days did not cause fish mortality. Hematological parameters such as RBCs, WBCs, hematocrit, and hemoglobin decreased significantly, but after re-feeding, they increased significantly in consecutive times. As for the blood glucose levels decreased during feed restriction and gradually increased after re-feeding. This study stated that feed restriction fish gained weight continuously during re-feeding, but no displaying compensatory growth. The results suggested that the decrease in hematological parameters did not indicate stress levels in fish, but reflected a lack of nutrition condition.
Salah satu upaya meningkatkan performa ikan nila Srikandi (Oreochromia aureus x Oreochromia niloticus), yang dirilis oleh Balai Penelitian Pemuliaan Ikan (BPPI) Sukamandi pada tahun 2012, adalah dengan meningkatkan keragaan genetik ikan nila biru (Oreochromis aureus), salah satu strain pembentuknya. Peningkatkan kualitas genetik ikan nila biru dapat dilakukan dengan program seleksi. Penelitian ini bertujuan untuk mengetahui nilai heritabilitas, serta respons seleksi benih ikan nila biru F-3 pada fase pendederan. Kegiatan pembenihan dilakukan di air tawar dengan wadah pemijahan berupa hapa 1 m x 1 m x 1 m. Induk jantan dan betina dipijahkan secara berpasangan dengan perbandingan 1:1. Larva dipanen pada hari ke-10 sampai ke-15, dan selanjutnya dipelihara di hapa pendederan berukuran 2 m x 2 m x 1 m selama 90 hari dengan padat tebar 125 ekor/m2. Selanjutnya benih dikelompokkan berdasarkan jenis kelamin jantan dan betina pada masing-masing famili. Paramater yang diamati meliputi pertumbuhan bobot dan panjang, koefisien keragaman (KK) panjang dan bobot, nilai heritabilitas nyata dan respons seleksi. Hasil penelitian menunjukkan ikan nila biru F-3 hasil seleksi mempunyai performa lebih baik dibandingkan nila biru nonseleksi. Pada akhir masa pemeliharaan, rataan bobot individu benih F-3 seleksi adalah sebesar 11,58±2,54 g; sementara pada populasi non-seleksi (kontrol) sebesar 8,95±2,80 g. Benih F-3 mempunyai nilai KK panjang dan bobot masing-masing sebesar 4,94%-25,05% dan 19,62%-53,47%. Nilai heritabilitas nyata pada populasi F-3 benih nila biru sebesar 0,81 dengan respons seleksi sebesar 2,63 g atau 22,74%.
Srikandi Tilapia is one of the superior hybridized varieties between black tilapia (Oreochromis niloticus) and blue tilapia (Oreochromis aureus). This fish has fast growth and high salinity tolerance. In its development, efforts are needed to improve and improve its genetic quality. Spawning srikandi tilapia using the parent of male blue tilapia F2 (family selection) is expected to improve performance better than the previous generation.The purpose of this study was to evaluate the growth performance and heterosis value of Srikandi tilapia produced from the extraction of female Nirwana strain tilapia with male blue tilapia F2. Hatchery activities were carried out in freshwater by mass spawning method on the 25 m2 pool. Enlargement activities were carried out at brackish water pond with salinity 25–40 g / L, using net measuring 3×5×1 m3 for 120 days. The stocking density used is 15 fishes / m2. The results of this study indicate that at the final test, the hybridization of Nw ♀x Au (F2)♂ has the best performance with the average of long gain16.60 ± 0.41cm, weight gain 215.33 ± 12.19 g and survival rate 78.50 ± 02.12. Evaluation of heterosis values on the characters of length, weight, survival, and biomass showed a positive value both on the hybridization of Nw ♀x Au (F2)♂ and Au (F2)♀x NW♂. The highest high parent heterosis value for blue tilapia broodstock is shown by population Nw ♀x Au (F2)♂ with values in each character of 6.96% (length), 26.06% (weight), 2.63% (survival), 28.57% (biomass).
Red tilapia is a one of the economically important fish species. In order to increase growth and feed efficiency, feed restriction strategies can be carried out. This study aims to determine the effect of periodic (weekly) restriction of feed on compensatory growth and physiological responses of red tilapia during the enlargement phase. The activity was carried out at the Fish Breeding Research Center for 4 months. The research method used a completely randomized design (CRD) 4 treatments with 3 replications, namely control (fish were fed daily), 1 (1 fasting day a week), 2 (2 fasting days a week), and 3 (3 fasting days a week). Fish rearing was conducted on the concrete tub measuring 2 x 1 x 0.8 m3 with a stocking density of 10 fish m-2. During the maintenance period of 120 days the fish were fed satiation twice a day. The results showed significant differences (P <0.05) in the value of weight growth, specific growth rate, daily growth and feed conversion ratio between control and other treatments, but not significantly different from treatment S1. The highest survival value was indicated by S1 treatment. The blood faal values of fish that were given feed restrictions consisting of red blood cells, white blood cells, hematocrit and hemoglobin showed that there was not significantly different than control fish (P> 0.05), which was at normal values. Restriction of feed to 1 day a week showed partial compensatory growth with better feed efficiency than fish fed daily.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
hi@scite.ai
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.