scholarly journals Pertumbuhan Rumput Laut Gracilaria sp. Dengan Rasio N:P Yang Berbeda

2018 ◽  
Vol 1 (1) ◽  
pp. 15-22 ◽  
Author(s):  
Vivian Ayu Cyntya ◽  
Gunawan Widi Santosa ◽  
Endang Supriyantini ◽  
Sri Yulina Wulandari
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
N:P Ratio ◽  
Average Weight ◽  
Entire Body ◽  
N:P Ratios ◽  
Randomized Design ◽  
Absolute Growth ◽  
The Absolute

Rumput laut merupakan tumbuhan yang tidak dapat dibedakan antara akar, batang dan daun, sehingga seluruh bagian tubuhnya disebut dengan thallus. Rumput laut Gracilaria sp. merupakan salah satu sumber daya laut yang mudah dibudidayakan, mempunyai nilai ekomonis penting dan mempunyai prospek pasar yang cerah, baik di dalam negeri maupun luar negeri. Usaha budidaya rumput laut Gracilaria sp. perlu dilakukan guna meningkatkan produksinya. Rumput laut Gracilaria sp. memerlukan N dan P sebagai unsur hara makro yang digunakan untuk pertumbuhan. Penelitian ini bertujuan untuk mengetahui pengaruh penambahan rasio N:P yang berbeda terhadap laju pertumbuhan Gracilaria sp. Metode yang digunakan adalah metode eksperimental dengan Rancangan Acak Lengkap (RAL). Penelitian ini menggunakan 3 perlakuan dan 1 kontrol, yang masing-masing ada 3 ulangan. Media pemeliharaan menggunakan air laut yang ditambah N:P dengan rasio yang berbeda, yaitu : A (Kontrol), B (6:1), C (6:2), D (6:3). Pencapaian berat rerata Gracilaria sp. selama 28 hari adalah sebagai berikut : A = 102,06 ± 0,04 g; B = 103,41 ± 0,57 g; C = 106,53 ± 0,66 g dan D = 108,28 ± 1,25 g. Pertumbuhan mutlak Gracilaria sp. yang dihasilkan selama penelitian adalah sebagai berikut : A = 2,06 ± 0,04 g;B = 3,41 ± 0,57 g; C = 6,53 ± 0,66 g; D = 8,28 ± 1,25 g. Laju pertumbuhan spesifik Gracilaria sp. yang dihasilkan selama penelitian, yaitu : A sebesar 0,07 ± 0,00 % berat (g) per hari; B sebesar 0,12 ± 0,02 % berat (g) per hari; C sebesar 0,23 ± 0,02 % berat (g) per hari dan D sebesar 0,28 ± 0,04 % berat (g) per hari. Hasil penelitian menunjukkan bahwa penambahan N:P dengan rasio yang berbeda berpengaruh nyata terhadap pertumbuhan mutlak dan laju pertumbuhan spesifik Gracilaria sp. (p < 0,01). Semakin tinggi konsentrasi rasio N:P dapat meningkatkan total biomassa dan laju pertumbuhan spesifik.   Seaweed is a plant which can not be distinguished between true roots, stalks and leaves, therefore its entire body is called a thallus. Gracilaria sp. is a seaweed which is relatively easy to cultivate, has high economical value and bright marketing prospect either in domestic or foreign markets. The effort to cultivate Gracilaria sp. needs to be done in order to increase the production. Seaweed Gracilaria sp. needs N and P as important macronutrients for its growth. This research aims to discover the effect of adding different N:P ratio towards Gracilaria sp. growth rate. The method used in this research was an experimental method with Completely Randomized Design. This research used three treatments and one control, each with three repetitions. The cultivation media was seawater with the addition of different N:P ratios, which were: A (Control), B (6:1), C (6:2) and D (6:3). The average weight of Gracilaria sp. for 28 days were as follows: A = 102,06 ± 0,04 g; B = 103,41 ± 0,57 g; C = 106,53 ± 0,66 g and D = 108,28 ± 1,25 g. The absolute growth of Gracilaria sp. during this research were: A = 2,06 ± 0,04 g;B = 3,41 ± 0,57 g; C = 6,53 ± 0,66 g; D = 8,28 ± 1,25 g. The specific growth rate for Gracilaria sp. during this research were: A = 0,07 ± 0,00 % weight (g) per day; B = 0,12 ± 0,02 % weight (g) per day; C = 0,23 ± 0,02 % weight (g) per day and D = 0,28 ± 0,04 % weight (g) per day. The result of this research showed that the addition of different N:P ratios caused a significant effect on the absolute growth and the spesific growth rate of Gracilaria sp. (p < 0,01). The higher concentratrion ratio of N:P given the higher either total biomassa and specific growth rate achieved.

scholarly journals PERGANTIAN PAKAN TERHADAP PERTUMBUHAN DAN KELANGSUNGAN HIDUP LARVA IKAN GURAMI (Osphronemus gouramy) TURN FEED ON THE GROWTH AND SURVIVAL OF FISH LARVAE CARP (Osphronemus gouramy)

2016 ◽  
Vol 4 (1) ◽  
Author(s):  
Eka Indah Raharjo ◽  
Hastiadi Hasan ◽  
Darmawan .
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Fish Larvae ◽  
Average Length ◽  
Natural Food ◽  
Growth And Survival ◽  
Quality Of Water ◽  
Randomized Design ◽  
Absolute Growth

ABSTRAK Penelitian bertujuan untuk mengetahui pergantian pakan. penelitian menggunakan Rancangan Acak Lengkap yang terdiri dari 5 perlakuan dan 3 ulangan. Susunan perlakuan adalah sebagai berikut : Perlakuan A : eguchi 10 hari dan infusoria 10 hari, Perlakuan B : infusoria 10 hari dan eguchi 10 hari, Perlakuan C : Eguchi 20 hari, Perlakuan D : Infusoria 20 hari dan Perlakuan E : campuran eguchi 50% dan Infusoria 50% selama 20 hari. Penelitian ini dilakukan selama 20 hari untuk mengetahui laju pertumbuhan spesifik bobot, laju pertumbuhan mutlak panjang, kelangsungan hidup dan kualitas air sebagai data penunjang. Hasil penelitian menunjukkan pergantian pakan alami dengan pakan buatan menghasilkan respon yang baik dalam pertumbuhan larva ikan gurami. Pergantian pakan buatan (eguchi) dengan pakan alami (infusoria)(perlakuan A) memberikan hasil terbaik dengan rata – rata laju pertumbuhan spesifik bobot 5,3256%, rata – rata laju pertumbuhan mutlak panjang 5.70 mm dan rata – rata kelangsungan hidup 78.89%.  Kata Kunci : Infusoria, Eguchi, Larva Ikan Gurami, Laju Pertumbuhan ABSTRACT Research was aimed to determine the change of feed. research using completely randomized design consisting of 5 treatments and 3 replications. The composition of the treatment is as follows: Treatment A: Eguchi 10 days and infusoria 10 days, Treatment B: infusoria 10 days and Eguchi 10 days, Treatment C: Eguchi 20 days, Treatment D: Infusoria 20 days and Treatment E: a mixture of Eguchi 50% and infusoria 50% for 20 days. This research was conducted for 20 days to determine the specific growth rate weight, the absolute growth rate of long survival and quality of water as supporting data. The results showed turnover natural feed with artificial feed to produce a good response in the growth of larval carp. Substitution of artificial feed (Eguchi) with natural food (infusoria) (treatment A) gives the best results with the average - average specific growth rate 5.3256% weighted, averageabsolute growth rate, average length of 5.70 mm and survival rate 78.89% . Keywords : Infusoria, Eguchi, Fish larvae Gurame, Growth Rate

scholarly journals The Effect of Different Thyroxine Hormone (T4) Concentration on The Growth, Survival, and Pigment Development of Pink Zebra Fish Larvae (Brachydanio reiro)

Omni-Akuatika ◽  
2018 ◽  
Vol 14 (2) ◽  
Author(s):  
Arifianto Heraedi ◽  
Slamet Budi Prayitno ◽  
Tristiana Yuniarti
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Fish Larvae ◽  
Average Length ◽  
Average Weight ◽  
Zebra Fish ◽  
Total Length ◽  
Absolute Growth

The thyroxin hormone plays an important role in the process of metabolism, yolk sac absorbsion, and growth of fish. The aims of this research were to observe the effect of various concentration of thyroxin (T4) on the absolute growth weight, total length, survival rate, and pigment development of pink zebra fish larvae (Brachydanio reiro ) after being reared 42 days. The pink zebra fish larvae at 4 day age with the average weight of  0,002 – 0,003g and average length of ± 3.10 – 3.43 mm were immersed at various concentration of T4 for 24 hours. Prior the treatment fish larvae were dipped into 1 ppt salinity for 2 minutes then transferred into 1 Liter, 1ppt saline and various T4 in plastic bags. The thyroxin concentrations were A (0 mg / L); B (0.05 mg / L); C (0.10 mg / L) and D (0.15 mg / L) respectively. The stocking density was 40 fish/L. After that they were transferred into aquariums and reared for 42 days. Completely Randomized Design (RAL) with four treatments and three replications were used. The variables observed were absolute and specific growth, total length, survival rate and hue degree. The results showed that the thyroxin hormone had significant effect on absolute growth weight, total length and specific growth rate.  The dosage 0.1 mg/L was the best treatment on absolute growth, total length, and specific growth rate. Whilee the survival rate showed no significant differences across the treatments. Treatment C also demonstrated the best ppigment development (14.60 + 0.36º hue) compared to others.

scholarly journals PERTUMBUHAN YUWANA ABALON (Haliotis squamata) YANG DIBERI PAKAN Ulva sp. DENGAN PENGKAYAAN UREA

2020 ◽  
Vol 13 (2) ◽  
pp. 115-125
Author(s):  
Iin Farliani ◽  
Nanda Diniarti ◽  
Alis Mukhlis
Keyword(s):  
Growth Rate ◽  
Body Weight ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Significance Level ◽  
Randomized Design ◽  
Daily Body Weight ◽  
Absolute Growth ◽  
Completely Randomized Design ◽  
The Difference

ABSTRACTThis study aims to determine the effect of different concentrations of urea as a source of nitrogen in Ulva sp. on absolute growth and daily specific growth rate of abalone juvenile (Haliotis squamata) as two main parameters in the experiment. Ulva sp. is one of the feed choices given when abalone enters the juvenile phase. This research was conducted on July 22-September 16 2019 at the Aquaculture Fisheries Center, Sekotong, West Lombok. The method used in this study is an experimental method with a Completely Randomized Design (CRD) consisting of 4 treatments and 3 replications namely A (control), B (20 ppm), C (40 ppm), D (60 ppm). Results of analysis of variance (ANOVA) at 5% significance level showed (F hit F tab 5%), which means the difference in the concentration of urea in Ulva sp. provide a real influence on the growth of absolute body weight and the specific growth rate of daily body weight abalone juvenile.Keywords: Ulva sp., Haliotis squamata, growth, nitrogen.ABSTRAKPenelitian ini bertujuan untuk mengetahui pengaruh kandungan konsentrasi urea yang berbeda sebagai sumber nitrogen pada Ulva sp.  terhadap pertumbuhan mutlak dan laju pertumbuhan spesifik harian yuwana abalon (Haliotis squamata) sebagai dua parameter utama dalam percobaan. Ulva sp. merupakan salah satu pilihan pakan yang diberikan saat abalon memasuki fase yuwana. Penelitian ini dilaksanakan pada tanggal 22 Juli-16 September 2019 bertempat di Balai Perikanan Budidaya Laut, Sekotong, Lombok Barat. Metode yang digunakan dalam penelitian ini adalah metode eksperimental dengan Rancangan Acak Lengkap (RAL) yang terdiri dari 4 perlakuan dan 3 ulangan yaitu A (kontrol), B (20 ppm), C (40 ppm), D (60 ppm). Hasil analisis sidik ragam (ANOVA) pada taraf nyata 5% menunjukkan (F hit F tab 5%) yang artinya perbedaan kandungan konsentrasi urea pada Ulva sp. memberikan pengaruh nyata bagi pertumbuhan mutlak bobot tubuh dan laju pertumbuhan spesifik harian bobot tubuh yuwana abalon.Kata Kunci: Ulva sp., Haliotis squamata, pertumbuhan, nitrogen.

scholarly journals Growth and hematology of pacu subjected to sustained swimming and fed different protein levels

2013 ◽  
Vol 48 (6) ◽  
pp. 645-650 ◽  
Author(s):  
Cleujosí da Silva Nunes ◽  
Gilberto Moraes ◽  
Fernando Fabrizzi ◽  
Araceli Hackbarth ◽  
Gustavo Alberto Arbeláez-Rojas
Keyword(s):  
Growth Rate ◽  
Weight Gain ◽  
Specific Growth Rate ◽  
Dietary Protein ◽  
Crude Protein ◽  
Specific Growth ◽  
Daily Weight Gain ◽  
Mean Corpuscular Hemoglobin ◽  
Protein Levels ◽  
Randomized Design

The objective of this work was to evaluate the effect of sustained swimming and dietary protein levels on growth and hematological responses of juvenile pacu (Piaractus mesopotamicus). A completely randomized design was used in a 3x2 factorial arrangement, with three levels of dietary protein (24, 28, and 32% crude protein), two rearing conditions (sustained swimming or motionless water), and 15 replicates. Fish were subjected to sustained swimming at the velocity of two body lengths per second (2 BL s-1), for 45 days. The level of dietary protein and the swimming conditions affected the performance, growth, and hematological profile of pacu. Swimming conditions influenced nutritional factors, increasing daily weight gain, specific growth rate, number of erythrocytes, mean corpuscular volume, and mean corpuscular hemoglobin. Fish under sustained swimming and fed with 24% crude protein showed better growth performance, with higher specific growth rate (4.11±0.88) and higher daily weight gain (2.19±0.47 g per day). Sustained swimming can increase the productive performance of pacu and simultaneously reduce dietary protein levels.

scholarly journals PERTUMBUHAN DAN SINTASAN HIDUP IKAN NILA DENGAN PENAMBAHAN TEPUNG WORI (Ormocarpum cochinchinense) FERMENTASI DALAM PAKAN

2021 ◽  
Vol 7 (2) ◽  
pp. 1-6
Author(s):  
Numisye Iske Mose ◽  
Jetti Treslah Saselah
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Fish Growth ◽  
Utilization Efficiency ◽  
Fish Feed ◽  
Randomized Design ◽  
Leaf Powder ◽  
Feed Utilization Efficiency

Tanaman wori merupakan salah satu tanaman kelompok fabaceace yang tumbuh melimpah di Sangihe dan sangat potensial digunakan sebagai salah satu sumber pakan ikan. Kadar protein daun wori adalah 25,53% sehingga berpotensi menjadi protein nabati bagi ikan. Kendala utama yang ditemui ketika memanfaatkan daun tanaman wori adalah kandungan karbohidrat yang tinggi yaitu 48,51% sehingga dapat mempengaruhi proses pencernaan ikan, penyerapan nutrisi yang berujung pada rendahnya pertumbuhan ikan. Tujuan dari penelitian ini adalah untuk mengetahui pengaruh tepung daun wori femerntasi terhadap laju pertumbuhan spesifik dan sintasan hidup ikan nila. Rancangan percobaan yang digunakan adalah Rancangan Acak Lengkap (RAL). Perlakuan yang dilakukan terdiri dari tiga perlakuan dan tiga kali ulangan yaitu kadar tepung daun wori tanpa fermentasi A (kontrol) 10%, kemudian B tepung daun wori fermentasi (10%), dan C tepung daun wori fermentasi (20%). Laju pertumbuhan spesifik dan efisiensi pakan diuji menggunakan ANOVA sedangkan sintasan hidup akan dianalisis secara deskriptif. Hasil penelitian ini menunjukan bahwa penambahan tepung wori fermenasi dalam pakan dapat meningkatkan nilai laju pertumbuhan spesfik ikan nila dan efisiensi pemanfaatan pakan dengan nilai tertinggi pada perlakuan C yaitu SGR 1,94%/hari. Sementara itu, untuk semua perlakuan nilai sintasan hidup sebesar 100%.   The wori plant is one of the plants of the fabaceace group that grows abundantly in Sangihe and has potential to be used as a source of fish feed. The protein content of wori leaves is 25.53%, so it has the potential to become vegetable protein for fish. The main obstacle encountered when utilizing wori plant leaves is the high carbohydrate content of 48.51% so that it can affect the digestion process of fish, nutrient absorption which lead to low fish growth. The purpose of this study was to determine the effect of wori femerntation leaf meal on the specific growth rate and survival of tilapia. The experimental design used was a completely randomized design (CRD). The treatments consisted of three treatments and three replications, namely the content of fermented wori leaf powder, A (control) 10%, then B fermented wori leaf powder (10%), and C fermented wori leaf powder (20%). Specific growth rate and feed efficiency were tested using ANOVA, while survival rate was analyzed descriptively. The results of this study indicate that the addition of fermented wori powder in the feed can increase the value of the specific growth rate of tilapia and feed utilization efficiency with the highest value in treatment C, namely SGR 1.94% / day. Meanwhile, for all treatments the survival rate was 100%.

scholarly journals Pengaruh Pemberian Probiotik Berbeda dalam Sistem Akuaponik terhadap Laju Pertumbuhan dan Survival Rate Ikan Lele (Clarias sp.)

2017 ◽  
Vol 1 (1) ◽  
Author(s):  
Ayu Herdianti Primashita ◽  
Boedi Setya Rahardja ◽  
Prayogo .
Keyword(s):  
Water Quality ◽  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Water Use ◽  
Specific Growth ◽  
Final Conclusion ◽  
Randomized Design ◽  
Business Efficiency ◽  
Range Test

Catfish (Clarias sp.) is a freshwater fish that is widely cultivated because it is a leading commodity. Increased production of catfish resulted in extra area of cultivated land and water use. The technology suitable to be applied is aquaponic system. In addition to saving land and water use, Aquaponic is also improving business efficiency through the utilization of nutrients from food remains and fish metabolism. Water quality is an important factor for the success of cultivation. Maintenance catfish with the addition of probiotics in aquaponic system can be a solution for maintaining water quality, because it contains bacteria that can increase nitrite to nitrate changes that can be utilized for growth of plants and do not poison the fish. The purpose of this study was to determine the effect of different probiotics in the aquaponic system towards growth rate and survival rate of catfish. The method that used in this research is experimental with completely randomized design (four  treat and five repeated) are P0 (control), P1 (probiotic A), P2 (probiotic B) and P3 (probiotic C). Analysis of data processed using Analysis of Variance. If there are significant differences then continued Duncan's Multiple Range Test. The results showed that the giving of probiotics in the aquaponic system is significantly different (p <0.05). The final conclusion is that the addition of probiotics in  aquaponic system affect the growth rate and survival rate of catfish. The highest specific growth rate (0.025%/ day) and the highest survival rate (77.8%) contained in the P2 treatment. The lowest specific growth rate (0.019% /day) and the lowest survival rate (64.4%) contained in P0 treatment (control). Keywords : Aquaponic, Catfish, Probiotic, Growth Rate, Survival Rate, Clarias sp.

scholarly journals Growth performance of siamese gourami Trichopodus pectoralis seed with different stocking density to optimize production capacity: optimum temperature and salinity application

2018 ◽  
Vol 47 ◽  
pp. 02007
Author(s):  
Lies Setijaningsih ◽  
Dewi Puspaningsih ◽  
Imam Taufik
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Specific Growth Rate ◽  
Growth Performance ◽  
Specific Growth ◽  
Production Capacity ◽  
Stocking Density ◽  
Optimum Temperature ◽  
Slow Growth Rate ◽  
Randomized Design

Fulfill needs of Siamese gourami still rely on the catch from nature, so the population in nature has become decreased. The increase of Siamese gourami fish production from culture is still constrained by the survival rate and slow growth rate in the seed phase. The purpose of this research was to determine the effect of Siamese gourami stocking density on the application of optimum temperature and salinity to growth performance for optimization of production capacity. Application of optimum temperature and salinity refers to the results of previous research, i.e., temperature of 28 °C and salinity 3 ‰. Siamese gourami seed with length of 2.96 ± 0.42 cm and weight of 5.27 ± 0.10 g used in the research. The experimental design used completely randomized design with four treatments, i.e. 1 fish L-1, 2 fish L-1, 3 fish L-1 and 4 fish L-1. The results showed that there were an effect of different stocking density on absolute growth weight and length, survival rate, specific growth rate and productivity. This is shown in the C treatment which growth was 4.95 ± 0.037 g, length 3.51 ± 0.01 cm, survival rate 93.47%, specific growth rate 1.22% and fish productivity of 625.76 g.

scholarly journals The Effect of Ploidy on Growth and Feeding Pattern of Diploid and Triploid Turbot Scophthalmus maximus Under Communal Rearing Condition

2021 ◽  
Vol 21 (06) ◽  
pp. 275-281
Author(s):  
Ilhan Aydin
Keyword(s):  
Growth Rate ◽  
Specific Growth Rate ◽  
Specific Growth ◽  
Scophthalmus Maximus ◽  
Average Weight ◽  
Feed Conversion ◽  
Farmed Fish ◽  
Conversion Rates ◽  
Significant Difference ◽  
Turbot Scophthalmus Maximus

Triploidy induction is a useful tool to produce sterile fish that prevents interbreeding of farmed fish with wild counterparts. In this study, growth performance and feed conversion rates of 12-months old diploid and triploid turbot that reared both communally and separately for 16 months at constant water temperature determined. At the end of the experiment, diploid, triploid, and communally reared groups reached an average weight of 672.4±21.0 g, 659.2±25.3 g and 660.5±12.0 g, respectively. Any significant differences were not observed in the weight of separately reared diploid and triploid turbot groups. In contrast, triploid fish in the communal group were significantly heavier than diploids at the end of the rearing period. The feed conversion rate of the ploidy group did not show any significant difference between groups. The highest mean specific growth rate was observed in the triploids in communal groups, whereas the diploids in communal groups had the lowest mean specific growth rate. The weight and length gain rates of the groups were similar. Diploid turbot growth appeared to be negatively affected by communal ploidy rearing. The results of the present study indicate that triploid turbot farm escapees may be advantageous in terms of growth in nature.

scholarly journals APLIKASI TEPUNG TESTIS SAPI YANG MENGANDUNG rGH DALAM PAKAN BUATAN TERHADAP RASIO JENIS KELAMIN, PERTUMBUHAN DAN KELULUSHIDUPAN IKAN NILA (Oreochromis niloticus)

2018 ◽  
Vol 17 (2) ◽  
Author(s):  
Rachmat Nurul Huda ◽  
Titik Sulistiowati ◽  
Tristiana Yuniarti
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Sex Ratio ◽  
Specific Growth Rate ◽  
Oreochromis Niloticus ◽  
Specific Growth ◽  
Sex Reversal ◽  
Average Weight ◽  
Fish Feed ◽  
Male Sex

<p align="center"><strong>ABSTRAK</strong></p><p>Budidaya ikan nila <em>(Oreochromis niloticus) </em>terus dikembangkan hingga saat ini. Berbagai teknologi dalam bidang perikanan telah diterapkan, salah satunya yaitu <em>sex reversal </em>dalam hal ini jantanisasi. Ikan nila jantan lebih cepat pertumbuhannya dari pada ikan nila betina sehingga dapat meningkatkan hasil produksi. Tujuan penelitian ini yaitu untuk mengetahui pengaruh pemberian tepung testis sapi dan dosis terbaik tepung testis sapi dalam pakan yang mengandung  rGH terhadap rasio jenis kelamin, pertumbuhan dan kelulushidupan ikan nila. Bahan uji yang digunakan adalah larva ikan nila dengan stadia larva yang berumur 7 hari setelah lepas kuning telur dan memiliki bobot rata-rata 0,07 gram/ekor. Penelitian ini menggunakan metode eksperimental dengan Rancangan Acak Lengkap 4 perlakuan dan 3 kali ulangan. Perlakuan dalam penelitian ini yaitu dengan menambahkan tepung testis sapi dengan dosis pada perlakuan A (0%/kg pakan), perlakuan B (3%/kg pakan), perlakuan C (6%/kg pakan) dan, perlakuan D (9%/kg pakan). Pakan pada setiap perlakuan dalam penelitian ini telah ditambahkan rGH dengan dosis 2 mg/kg pakan. Data yang diamati meliputi rasio jenis kelamin, laju pertumbuhan spesifik (SGR), dan tingkat kelulushidupan (SR) ikan nila<em>.</em> Hasil penelitian menunjukan bahwa perlakuan C (6% tepung testis sapi/kg pakan) memberikan hasil terbaik dimana nilai rasio jenis kelamin jantan sebesar 74,44±5,09% dan laju pertumbuhan spesifik sebesar 9,48±0,10% bobot/hari. Kesimpulan yang diperoleh dalam penelitian ini yaitu adanya pengaruh nyata terhadap rasio jenis kelamin dan tingkat pertumbuhan spesifik, namun tidak berpengaruh nyata terhadap tingkat kelulushidupan ikan nila dengan pemberian dosis tepung testis sapi terbaik adalah 6% tepung testis sapi/kg pakan.</p><p><strong>Kata kunci: </strong>Sex reversal; Tepung testis sapi;  Pertumbuhan, rGH; Nila<strong></strong></p><p align="center"><strong>ABSTRACT</strong></p><p><em>Tilapia fish (Oreochromis niloticus)cultivation still continue to be developed until nowdays. Many fisheries technology had been applied, and one of them is sex reversal which is masculinization. Male tilapia fish grows faster than the female one, so this can boost the produce of the fish. This research aims to know the effect of cow testicle flour addition and determine the best dosage on the fish feed which contains rGH towards the male-sex ratio, growth, and survival rate of tilapia fish. The material which used in this research was tilapia fish (O. niloticus) which under the larvae phase 7 days post the separated egg yolk which have average weight of 0,07 grams/each. This research used experimental methods with Completely Randomized Design of 4 treatments and 3 times of repetitions. The treatments in this research was addition of  different dosage of bull testicle which treatment A (0%/kg fish feed),treatment B (3%/kg fish feed), treatment C (6%/kg fish feed) and, treatment D (9%/kg fish feed). The fish feed in every treatment had been added with 2mg rGH/kg fish feed. Data observation  during this research were male-sex ratio, specific growth rate (SGR), and survival rate (SR) of tilapia fish. Results of the research showed that treatment C (6%/kg fish feed) gave the best result as male-sex ratio by 74,44±5,09% and specific growth rate by 9,48±0,10% weight/day. Conclusion obtained from this research was: there was different result  towards the male-sex ratio and specific growth rate, but there was no difference between the treatments towards the survival rate, the best bull testicle flour dosage was 6%/kg fish feed. </em></p><p><strong><em>Keywords:</em></strong><em> Sex reversal, Bull testicle flour, Growth, rGH, Tilapia<strong></strong></em></p>

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