Effect of Broodfish Sex Ratio on Seed Production of Red Tilapia in Suspended Hapa

2011 ◽  
Vol 6 (7) ◽  
pp. 862-866 ◽  
Author(s):  
M.P.A. Muntaziana ◽  
A. A. Rahim ◽  
S.A. Harmin ◽  
S.M.N. Amin
Keyword(s):  
Sex Ratio ◽  
Seed Production ◽  
Red Tilapia

scholarly journals Study of sex ratio in progeny of a complex Oreochromis hybrid, the Florida red tilapia

Aquaculture ◽  
2006 ◽  
Vol 251 (2-4) ◽  
pp. 231-237 ◽  
Author(s):  
Damien Desprez ◽  
Cédric Briand ◽  
Marie Claude Hoareau ◽  
Charles Mélard ◽  
Pierre Bosc ◽  
...  
Keyword(s):  
Sex Ratio ◽  
Red Tilapia

scholarly journals PENGARUH SUHU AIR TERHADAP DAYA TETAS TELUR DAN PERKEMBANGAN LARVA NILA MERAH (Oreochromis sp.)

2002 ◽  
Vol 4 (2) ◽  
pp. 22
Author(s):  
Rustadi Rustadi
Keyword(s):  
Ambient Temperature ◽  
Water Temperature ◽  
Seed Production ◽  
Incubation Time ◽  
Soft Drink ◽  
Circulation System ◽  
Hatching Rate ◽  
Red Tilapia ◽  
Egg Incubation ◽  
Optimum Water

Artificial incubations of red tilapia eggs and fry were conducted in the effort to increase fish seed production and its quality. These experiments were done to determine suitable water temperature for egg incubation and larvae rearing. Four different water temperature­s, 24, 27, 30, and 33oC with variance 1oC and ambient temperature were tested in triplicates. One liter of plastic incubators made from soft drink bottles were set to water re-circulation system and provided with filter means.The fertilized eggs were stocked at 150 eggs. The hatching rate of egg increased as the increase of water temperature. The increase of water temperature decreased the incubation time of eggs, but increased hatching rate and the growth of larvae. The optimum water temperature was 29,87oC. 

scholarly journals Evaluation of larvae production and growth of juvenile red tilapia NIFI F1 during the nursery phase

2019 ◽  
Vol 18 (3) ◽  
pp. 251
Author(s):  
Adam Robisalmi ◽  
Priadi Setyawan ◽  
Bambang Gunadi
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Seed Production ◽  
Specific Growth ◽  
Stocking Density ◽  
Brood Stock ◽  
Female Ratio ◽  
Red Tilapia ◽  
Ad Libitum

Genetic quality improvement can be done through breeding programs. The indicator of success in the selection is the improvement of the character of production. Larval production and growth of NIFI of F1generation red tilapia seeds in the selection and its control parents were evaluated in this study. The research was conducted at the Fish Breeding Research Center for four months. Spawning was carried out on freshwater ponds of cage with size of  1 x 1 m. Tilapia brood stock were stocked with male to female ratio of 1: 1. The larvae rearing were conducted in the cage with size 2x2x1 m3 and stocking density 125 m-2. Pellets with a protein content of 38-40% are given to ad libitum larvae three times a day for first month, and then feeding rate was given 15-20% daily from biomass. Seed production, growth, specific growth rate, and survival rate were observed. The results of the experiment show a difference between fish selected and control. Seed production of selection reached 540 ± 114 and controls   508 ± 142. The growth performance of selected red tilapia juvenile showed higher compared with the control. The mean length  of  selected population  reached 6.33 ± 0.43 cm , weight gain 6.60 ± 0.52 g, specific growth rate 7.33 ± 0% g days-1 and survival rate  81.50 ± 4.46% were respectively and the control population  5.76 ± 0.52 cm ; 4,90 ± 0.58 g; 4.50 ± 0.35% g days-1; and 74.85 ± 3.26%. These values indicate that the growth of red tilapia juvenile NIFI F1 generation was increased 25.76%.AbstrakSalah satu upaya yang dapat dilakukan untuk meningkatkan kualitas genetik yaitu melalui program pemuliaan. Per-baikan karakter reproduksi dan pertumbuhan dapat digunakan sebagai indikator keberhasilan seleksi. Penelitian ini bertujuan untuk mengevaluasi produksi larva dan pertumbuhan benih ikan nila merah NIFI F1 dari induk seleksi dan kontrol. Kegiatan dilaksanakan selama empat bulan di Balai Riset Pemuliaan Ikan. Pemijahan dilakukan di kolam air tawar pada hapa 1 m x1 m.  Perbandingan induk ikan nila jantan dan betina 1:1. Larva yang sudah dipanen dimasukkan pada hapa pendederan ukuran 2x2x1 m3 dengan padat tebar 125 ekor m-2 . Selama pendederan , larva diberi pakan (protein 38-42%) secara ad libitum tiga kali sehari pada bulan pertama dan selanjutnya diberi pakan dua kali sehari 15-20% dari biomassa. Pakan yang diberikan selama pendederan mempunyai protein berkisar 38-42%. Parameter yang diamati meliputi produksi larva, pertumbuhan, laju pertumbuhan spesifik, dan sintasan. Hasil penelitian menunjukkan produksi larva ikan nila merah seleksi yaitu 540±114 ekor dan kontrol 508±142 ekor. Performa pertumbuhan benih ikan nila merah seleksi menunjukkan hasil yang lebih tinggi dibanding kontrol dengan nilai pertumbuhan panjang 6,33 ±0,43cm, pertumbuhan bobot 6,60±0,52 g, laju pertumbuhan spesifik 7,33±0% g hari-1 serta sintasan 81,50±4,46%, se-dangkan populasi kontrol masing-masing 5,76±0,52 cm; 4,90±0,58 g; 4,50±0,35% g hari-1; dan 74,85±3,26%. Nilai ini menunjukkan bahwa ada peningkatan pertumbuhan sebesar 25,76% pada benih ikan nila merah NIFI F1.

scholarly journals Optimum Salinity Level for Seed Production and Survival of Red Tilapia (Hybrid) in Concrete Tanks

2017 ◽  
Vol 49 (3) ◽  
pp. 1049-1056
Author(s):  
Abdul Malik ◽  
Ghulam Abbas ◽  
Hameeda Kalhoro ◽  
Illahi Bux Kalhoro ◽  
Syed Sajjad A. Shah ◽  
...  
Keyword(s):  
Seed Production ◽  
Salinity Level ◽  
Red Tilapia ◽  
Optimum Salinity

scholarly journals Effect of Orally Administrated Acriflavine to larval of Red Tilapia (Oreochromis sp.) on Their Sex Ratio

2007 ◽  
Vol 4 (2) ◽  
pp. 131
Author(s):  
M. Zairin Junior ◽  
D. Nurlestiyoningrum ◽  
M. Raswin
Keyword(s):  
Survival Rate ◽  
Sex Ratio ◽  
Sex Reversal ◽  
Fish Growth ◽  
Male Fish ◽  
Red Tilapia ◽  
Sex Development ◽  
And Control ◽  
Marketable Size

<p>Uncontrolled and excessive spawning of red tilapia (<em>Oreochromis</em> sp.) hinders fish growth to reach marketable size.  Several techniques have been developed to produce monosex population to overcome the problem, such as sex reversal by hormonal administration.  Androgen hormone is generally employed to meet the goal, although the use of this hormone had been restricted and its price is relatively high. Acriflavine is an alternative chemical and its effect on sex development toward male fish has been proved.  In this study, acriflavine at dose of 0, 15, 25 and 35 mg/kg feed were fed to 10-day-old larvae for 6 weeks.  Feeding of larvae by diet containing 17a-methyltestosterone (MT) at dose of 50 mg/kg was also observed as a comparison of acriflavin treatment.  The results indicated that feeding of larvae by diet containing acriflavine 25 mg/kg (78.3%) and 35 mg/kg (79.0%) produced significantly higher percentage of male fish compared to 15 mg/kg and control.  However, the result is still lower compared to that of MT treatment (99.2%).  Acriflavine treatment had no effect on survival of red tilapia and survival rate was similar among treatments, ranged from 91.7% to 95.0%.</p> <p>Keywords: red tilapia, <em>Orechromis</em> sp., monosex,  acriflavine</p> <p> </p> <p>ABSTRAK</p> <p>Pemijahan tak terkontrol dan berlebih pada ikan nila merah (<em>Oreochromis </em>sp.) menghambat pertumbuhan ikan untuk mencapai ukuran konsumsi. Beberapa teknik yang telah dikembangkan untuk menghasilkan ikan monosek sebagai solusi permasalahan tersebut antara lain dengan seks reversal menggunakan hormon. Secara umum, hormon golongan androgen digunakan untuk mencapai tujuan, namun penggunaannya mulai dibatasi dan harganya relatif mahal. Akriflavin merupakan bahan alternatif yang terbukti dapat mempengaruhi perkembangan kelamin ke arah jantan.  Pada penelitian ini dilakukan pemberian akriflavin dengan dosis 0, 15, 25 dan 35 mg/kg pakan ke larva umur 10 hari selama 6 minggu. Sebagai pembanding juga dilakukan pemberian pakan yang mengandung hormon 17a-metiltestosteron dosis 50 mg/kg pakan.  Hasil penelitian menunjukkan bahwa pemberian pakan yang mengandung akriflavin 25 mg/kg pakan (78,3%) dan 35 mg/kg pakan (79,0%) menghasilkan ikan jantan dengan persentase lebih banyak dibandingkan dengan perlakuan 15 mg/kg (72,46%) dan kontrol (58,37%).   Namun demikian, hasil tersebut masih lebih rendah dibandingkan dengan perlakuan MT (99,2%).  Perlakuan akriflavin tidak mempengaruhi kelangsungan hidup ikan nila merah dan tidak berbeda  nyata dengan kontrol, berkisar antara 91,7-95,0%.</p> <p>Kata kunci: Nila merah, <em>Orechromis</em> sp., monoseks, akriflavin</p>

scholarly journals Effect of PPO-Inhibiting Herbicides on the Growth and Sex Ratio of a Dioecious Weed Species Amaranthus palmeri (Palmer Amaranth)

Agronomy ◽  
2019 ◽  
Vol 9 (6) ◽  
pp. 275 ◽  
Author(s):  
Mafia M. Rumpa ◽  
Ronald F. Krausz ◽  
David J. Gibson ◽  
Karla L. Gage
Keyword(s):  
Sex Ratio ◽  
Seed Production ◽  
Sex Ratios ◽  
Rapid Evolution ◽  
Palmer Amaranth ◽  
Amaranthus Palmeri ◽  
Weed Species ◽  
Herbicide Treatments ◽  
Underlying Mechanisms ◽  
Sites Of Action

Amaranthus palmeri S. Watson (Palmer amaranth) is a fast-growing, dioecious, highly competitive agricultural weed species, which is spreading across the US Midwest. Population sex ratios are an important consideration in the management of A. palmeri populations as this species has become resistant to several herbicide sites of action, and there is need to minimize seed production by female plants. Environmental conditions, particularly stressors, may influence sex ratios, and herbicides act as major stressors and evolutionary filters in agricultural fields. Amaranthus spp. have shown a tendency for rapid evolution of herbicide resistance, with the frequency of protoporphyrinogen oxidase (PPO)-inhibitor resistance increasing across the Midwestern US. A greenhouse experiment was conducted to investigate the effect of two PPO-inhibiting herbicide treatments of either lactofen or fomesafen on four different Illinois populations (Cahokia, Collinsville, Rend Lake, and Massac). Plants raised from seed from the Massac population were tallest, and both males and females from this population also had the highest vegetative biomass. Female plants from the Collinsville population had more reproductive biomass than male plants. Control populations were male-biased (Cahokia, Collinsville), female-biased (Masaac), and 1:1 (Rend Lake). Lactofen shifted the male-biased populations to female-biased or 1:1 and the female-biased population to 1:1. Fomesafen-treated populations were male-biased or 1:1. This study suggests that PPO-inhibiting herbicide treatments may influence the growth and sex ratio of A. palmeri populations, which is an underlying factor in the rate of herbicide evolution in this species. An understanding of the underlying mechanisms of how external factors influence sex ratios may eventually provide an opportunity to reduce seed production in populations by shifting sex ratios towards a male bias.

Influence of sex ratio and sexual lability on seed production in the dioecious perennial shrub Atriplex amnicola (Chenopodiaceae)

1997 ◽  
Vol 37 (6) ◽  
pp. 661 ◽  
Author(s):  
M. Strawbridge ◽  
R. W. Bell ◽  
J. A. McComb ◽  
E. G. Barrett-Lennard
Keyword(s):  
Sex Ratio ◽  
Seed Production ◽  
Seed Quality ◽  
Seed Set ◽  
Dioecious Species ◽  
Female Ratio ◽  
Male Female Ratio ◽  
Perennial Shrub ◽  
Set Up ◽  
Field Plots

Summary. Pollen supply can limit seed set in dioecious species such as Atriplex amnicola Paul G. Wilson (river saltbush). Clonal populations, with 4 different male : female ratios (0 : 1, 1 : 8, 1 : 1 and 5 : 1), were set up in widely spaced field plots at Tammin, Western Australia. After 1 season, plants were examined for fruit fill and fruit germination. The optimal male : female ratio for Atriplex amnicola seed production was between 1 : 8 (11% males) and 1 : 1 (50% males). These ratios resulted in mean fruit fills of 24 and 36%, respectively. Genotype had a significant effect on fruit fill. The 3 clones tested had fruit fills of 40, 36 and 31%. These differences in fruit fill were as significant as those obtained from reducing the percentage of males from 50 to 11%. A population of 700 seedlings of A. amnicola examined over 5 years was shown to be sexually labile, with a slight decrease over time in males and an increase in females and monoecious plants. Sexual lability appeared to be linked to plant aging rather than to environmental stimuli. It was concluded that plantations of river saltbush set up for seed production should be planted with selected genotypes at a male : female ratio of between 1 : 8 and 1 : 1 and that plantations need to be monitored for change in sex ratio with time, to ratios suboptimal for seed quality and production.

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