Effects of rotifer densities on larval performance of spotted scat (Scatophagus argus)

This study is aimed to determine the optimal rotifer feeding density for larviculture of spotted scat fish (Scatophagus argus). The experiment was randomly set up in triplicate with 5 treatments including 5, 10, 15, 20 and 25 rotifers/mL. The fish larvae with the initial body length and depth at 2,343 ± 110 µm and 812 ± 85µm, respectively, were stocked in 250-L tanks at 10 larva/L of density and 25‰ of salinity. After 21 days of rearing, the results showed that the larval growth were at 243 – 330 µm/day of DLG and 5.50 – 6.70 %/day of SGRL; 131 –204 µm/day of DDG and 7.20 – 8.93 %/day of SGRD, but no significant difference in larval growth performance was recorded among treatments (p>0.05). However, the highest survival rate of fish larvae (35.4-48.1%) was recorded in the treatments fed 5 and 10 rotifers/mL and was significantly higher than other treatments (p<0.05). The data demonstrated that spotted scat larvae fed effectively across as wide range of rotifer densities and the range at 5-10 rotifers/mL were suggested for the husbandry practices.

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Effects of stocking density on growth performance, survival rate and economic efficiency of Asian seabass (Lates calcarifer) cultured in earthen pond

The Journal of Agriculture and Development ◽

10.52997/jad.8.05.2020 ◽

2020 ◽

Vol 19 (05) ◽

pp. 65-70

Author(s):

Nhan T. Dinh

Keyword(s):

Water Quality ◽

Survival Rate ◽

Growth Performance ◽

Economic Efficiency ◽

Quality Parameters ◽

Fish Growth ◽

Water Quality Parameters ◽

Lates Calcarifer ◽

Asian Seabass ◽

Significant Difference

This trial aimed to evaluate effects of stocking densities of 1-5 fish/m2 on growth performance, survival rate and economic efficiency of Asian seabass (Lates calcarifer) in earthen ponds. Fish with an initial length of 90.7 ± 0.1 mm and weight of 20.8 ± 0.1 g/fish and ponds with 600 m2 each and 1.5 m depth were used for this study. Experiment was designed with three treatments, including different stocking densities of 1, 3 and 5 fish/m2. The fish was fed with pellete feed containing 43 - 44% crude protein. Water quality parameters including temperature, dissolved oxygen, pH, salinity, transparency and ammonia concentration were measured once a week. Fish were sampled every 30-day intervals for length and weight measurement then for their growth estimation. Costs were recorded for economic efficiency estimation. Results showed that the water quality parameters were in suitable ranges for growth and development of Asian seabass. The final average length and weight of density 1 fish/m2 was significantly higher than those at 3 and 5 fish/m2 (P < 0.05). However, there was no significant difference on the fish growth in terms of daily length and weight gain, as well as survival rate and feed conversion ratio between different stocking densities. Asian seabass culture at 3 and 5 fish/m2 resulted in a higher profit compared to at 1 fish/m2. The highest economic efficiency in terms of area pond was showed at 5 fish/m2 treatment.

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Growth Performance of Larvae Produced from Vitamin E Treated Female Clarias batrachus (Linnaeus)

Progressive Agriculture ◽

10.3329/pa.v20i1-2.16862 ◽

2013 ◽

Vol 20 (1-2) ◽

pp. 107-116

Author(s):

MFA Mollah ◽

A Roy ◽

MSA Mamun

Keyword(s):

Vitamin E ◽

Survival Rate ◽

Growth Performance ◽

Health Condition ◽

Clarias Batrachus ◽

Growth And Survival ◽

Significant Difference ◽

The Difference ◽

Length Gain ◽

Percent Weight Gain

An experiment to observe the growth performance of the larvae produced from female Clarias batrachus treated with 4 dietary levels of vitamin E viz. 0 mg, 50 mg, 100 mg, and 200 mg /kg feed was conducted for 28 days. After rearing for 3 months females were used for induction of breeding to produce larvae. Same dose of pituitary gland (100 mg PG/kg body weight) was used for all treatments. From the 7th day of hatching, the larvae were reared for another period of 28 days to see growth and survival rate of the larvae produced by the broods maintained under different dietary levels of vitamin E. In case of growth performance (percent length gain, percent weight gain, specific growth rate) and health condition larvae of T2 (50 mg vitamin E/kg feed) showed significantly better result when compared with those of T1 and T3. There was no significant difference in the growth performance between the larvae of T2 and T4. Larvae of T2 although showed higher survival rate but the difference between different treatments was insignificant. The results concluded that 50 mg vitamin E/kg feed is more suitable to increase growth and survival rate of the larvae.DOI: http://dx.doi.org/10.3329/pa.v20i1-2.16862 Progress. Agric. 20(1 & 2): 107 116, 2009

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Evaluation of the Performance of a Newly Developed Wireless Temperature and Moisture Sensor for Rice under Various Levels of Temperature, Moisture Content, and Dockage

Applied Engineering in Agriculture ◽

10.13031/aea.13077 ◽

2019 ◽

Vol 35 (3) ◽

pp. 311-318 ◽

Cited By ~ 1

Author(s):

Kaushik Luthra ◽

Soraya Shafiekhani ◽

Brandon Stephens ◽

Sammy Sadaka ◽

Griffiths G Atungulu

Keyword(s):

Moisture Content ◽

Maintenance Cost ◽

Drying Process ◽

Milled Rice ◽

Moisture Sensor ◽

Down Low ◽

Wide Range ◽

Significant Difference ◽

Set Up ◽

On Farm

Abstract. Monitoring on-farm, in-bin natural air drying process of rice is critical to achieve optimum milled rice quality, milling yields, and maximize profits to growers and processors. Engineering tools such as temperature/humidity cables with sensors for grain condition monitoring, and mobile applications have emerged to provide significant improvements in quality control and automation of the drying process. This research seeks to improve the performance of a recently developed, novel wireless probe for sensing temperature and moisture content of rice. The specific objective is to test the accuracy and precision of the measurements over a wide range of rice temperature (20°C to 60°C), moisture content (13% to 25% wet basis), and dockage levels (0 to 10% by weight). Wireless probes designed and built in collaboration with Deacon Technologies LLC were used in this study. The probes were calibrated against thermocouple readings for temperature measurements and standard oven method measurements for moisture content. Experiments were performed in triplicates using three different probes and three metal containers with rice samples to check the accuracy of the probes and to determine the variability amongst different probes. The probes were accurate due to the strong regressions found between the measured and true values of temperature and moisture content. The ANOVA analysis showed that there was no significant difference within different probes both for temperature (p = 0.17) and moisture content (p = 0.48) measurements. Calibration equations were developed to further reduce the variance in the probe measurements. Both for temperature and moisture content measurements, the calibration equation coefficients were statistically significant with positive slopes and small standard errors (less than 0.5). Thus, these probes could be handy for on-farm in-bin rice temperature and moisture monitoring; with the merits of portability, easy set-up and tear down, low initial and maintenance cost, and precise and accurate measurements. Keywords: Calibration, Dockage, Moisture content, On-farm in-bin drying, Rough rice, Temperature, Wireless probe.

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EFFECTS OF CARBON DIOXIDE ENRICHMENT AND IRRADIANCE ON EX VITRO ROOTING, ACCLIMATIZATION AND SUBSEQUENT GROWTH OF MICROPROPAGATED APPLE AND BLUEBERRY.

HortScience ◽

10.21273/hortsci.28.4.254a ◽

1993 ◽

Vol 28 (4) ◽

pp. 254A-254

Author(s):

Marvin Pritts ◽

Dorcas Isuta

Keyword(s):

Survival Rate ◽

Dry Weight ◽

Great Sensitivity ◽

High Light ◽

Low Light ◽

Light Levels ◽

Significant Difference ◽

Vigorous Growth ◽

Set Up

Previous findings reveal that rooting and acclimatization of apple and blueberry plants is often difficult, inconsistent and inefficient. This experiment was set up in a fog chamber lo investigate the effects of CO2 enrichment (CDE) and irradiance on unrooted stage II microshoots. Two CO2 and 3 light levels tested were: 1350 +/- 150 (+ CDE), and 450 +/- 50 (- CDE) ppm; 30 +/- 5 (low), 55 + 10 (medium), and 100 + 20 (high) umolm-2s-1 respectively. Cultivars assessed were Berkeley and Northsky for blueberry. G65 and NY30 for apple. Blueberry microshoots acclimatized successfully and gave between 90 to 100% rooting and survival rate. Apple microshoots acclimatized and rooted slowly, exhibited great sensitivity to in vivo conditions and gave between 40 to 100% rooting and survival rate. High light induced photo-inhibition which disappeared after complete acclimatization. There was a significant difference between low light and the other two light levels. The effect of CDE was dependent on cultivar. In most cases, high light (-) CDE gave the most vigorous growth (highest plant dry weight and leaf area). There was a significant difference between (+) CDE and (-) CDE at low and medium light, but none at high light. Low light (-) CDE and medium light (+) CDE were superior over low light (+) CDE and medium light (-) CDE. respectively. Stalling out in apple microshoots was corrected by GA sprays.

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ƯƠNG GIỐNG CUA BIỂN (Scylla paramamosain) VỚI CÁC LOẠI THỨC ĂN VÀ MẬT ĐỘ KHÁC NHAU

Tạp chí Khoa học và Công nghệ Biển ◽

10.15625/1859-3097/20/1/13335 ◽

2020 ◽

Vol 20 (1) ◽

Author(s):

Le Quoc Viet ◽

Tran Ngoc Hai

Keyword(s):

Survival Rate ◽

Growth Performance ◽

Stocking Density ◽

Scylla Paramamosain ◽

Mud Crab ◽

Commercial Feed ◽

Set Up

This study aims to determine the appropriate feed type and stocking density to improve the survival rate and growth performance of mud crab crablet during the nursery stage. The study consisted of 2 experiments as follows: (1) Rearing crablets with different feed types (including commercial feed, artemia biomass and acetes biomass) and (2) rearing crablets at different stocking densities (including 100; 200; 300 and 400 inds/m2). All treatments were randomly set up in triplicate. The initial sizes of crablet were 3.24 ± 0.54 mm in length, 4.54 ± 0.79 mm in width and 0.018 ± 0.004 g in weight. The result showed that using acetes biomass gave the best results compared to other treatments. The survival rate was 58.8% and biomass was 118 inds/m2. The second experiment showed that rearing crablets at 100 inds/m2 reached the highest survival rate (90.7%) and biomass (91 inds/m2).

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Tingkat keragaman ukuran benih ikan lele Clarias sp. yang diberi Artemia dengan periode yang berbeda

Jurnal Akuakultur Indonesia ◽

10.19027/jai.15.2.156-161 ◽

2016 ◽

Vol 15 (2) ◽

pp. 156

Author(s):

Dedi Jusadi ◽

Farida Fitriani ◽

Julie Ekasari ◽

Apriana Vinasyiam

Keyword(s):

Survival Rate ◽

Growth Performance ◽

Size Distribution ◽

Body Length ◽

Size Variation ◽

Culture Period ◽

Medium Size ◽

Feeding Period ◽

Average Body Length ◽

Average Body

ABSTRACT This research was conducted to evaluate the effect of different Artemia feeding period on the size variation of catfish Clarias sp. larvae. One thousand two days post hatched larvae with an average body length of 0.7±0.03 cm were randomly distributed into 25 L round plastic tanks. The treatment conducted for 13 days with four treatment; without Artemia, given Artemia 1, 2, or 3 days in the first culture period. The results showed that 15 days old fish has the same survival rate in all treatments; and has two size distribution i.e. the small size (S) and medium size (M). Increasingly the period of administration of Artemia, the percentage of the amount of M-size fish increases, thereby giving Artemia were able to increase growth of larvae. Feeding catfish with Artemia for two days has shown producing better growth. Keywords: catfish, Artemia, size variation, growth performance ABSTRAK Penelitian ini dilakukan untuk mengevaluasi pengaruh perbedaan periode pemberian pakan Artemia terhadap kinerja pertumbuhan larva ikan lele Clarias sp. Seribu ekor larva lele yang berumur dua hari dengan panjang rata-rata 0,7±0,03 cm ditebar dalam wadah dengan volume air 25 L. Budidaya ikan dilakukan selama 13 hari dengan empat perlakuan, yaitu perlakuan tanpa pemberian Artemia, pemberian Artemia selama satu, dua, atau tiga hari di awal masa budidaya. Hasil penelitian menunjukkan bahwa ikan umur 15 hari memiliki sintasan yang sama di semua perlakuan, serta memiliki dua sebaran ukuran, yakni ukuran kecil (S) dan ukuran sedang (M). Semakin lama periode pemberian Artemia, persentase jumlah ikan ukuran M meningkat, sehingga pemberian Artemia pada larva ikan lele mampu meningkatkan pertumbuhan. Pemberian Artemia selama dua hari memberikan pertumbuhan yang lebih baik. Kata kunci: ikan lele, Artemia, keragaman ukuran, kinerja pertumbuhan

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Rearing white leg shrimp larvae (Litopenaeus vannamei Boone, 1931) with concentrated diatom (Thalassiosira sp.)

The Journal of Agriculture and Development ◽

10.52997/jad.8.01.2020 ◽

2020 ◽

Vol 19 (01) ◽

pp. 59-64

Author(s):

Nhien V. Tran

Keyword(s):

Survival Rate ◽

Body Length ◽

Litopenaeus Vannamei ◽

Stocking Density ◽

The Other ◽

Marine Aquaculture ◽

Water Parameters ◽

Breeding Center ◽

Significant Difference

The objective of the experiment was to determine the best type of algae for growth, survival rate and the metamorphosis time of white leg shrimp larvae. The experiment consisted of five treatments: dried Spirulina sp. (NT 1), fresh Chaetoceros sp. (NT 2), fresh Thalassiosira sp. (NT 3), Thalassiosira sp. in concentrated form (NT 4) and Thalasiosira sp. in paste form (NT 5). The larvae at Nauplius VI were stocked in 0.5 m3 tank at the stocking density of 200 inds/L. The care regime was applied according to the popular process at the National Breeding Center for Southern Marine Aquaculture. After 10 days of stocking, the water parameters in all treatments were in a suitable range for the growth of larvae. The larvae in NT 4 showed the best body length, survival rate, metamorphosis time and were significant difference compared to the remaining treatments (P < 0.05). Whereas NT 5 was not significantly different (P > 0.05) compared to NT 2 in body length and NT 3 in metamorphosis time. NT 1 showed the worst these characteristics to the other treatments. In general, the use of concentrated Thalassiosira sp. for rearing white leg shrimp larvae gives good results, which should be commonly applied.

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Growth performance and survival rate of catfish (Pangasianodon hypophthalmus) juvenile which is reared in recirculation system

Jurnal Iktiologi Indonesia ◽

10.32491/jii.v20i3.533 ◽

2020 ◽

Vol 20 (3) ◽

pp. 271

Author(s):

Yuke Eliyani ◽

Iin Siti Djunaidah ◽

Sujono Sujono

Keyword(s):

Survival Rate ◽

Growth Performance ◽

Survival Rates ◽

Stocking Density ◽

Fish Growth ◽

Water Volume ◽

Bacillus Sp ◽

Pangasianodon Hypophthalmus ◽

Significant Difference ◽

Recirculation System

Although recirculation is a cultivation system that has been tried in various commodities, but the effectiveness of this system to the growth and survival of catfish juvenile has not been done. This study aims to determine the effective-ness of recirculation system on growth performance and survival rate of catfish juvenile (Pangasianodon hypophthal-mus). The research was conducted from 11 October to 30 November 2019 at hatchery unit Department of Fisheries Extension, Jakarta Technical University of Fisheries. This study used experimental method with 3 treatments, namely Control (K: 100% Bioball + Bacillus sp.), Treatment 1 (P1: 50% Bioball + 25% zeolite + 25% resin + Bacillus sp.) and Treatment 2 (P2: Bioball 25 % + zeolit 50% + resin 25% + Bacteria Bacillus sp.). The catfish used in this study was measured 0.08 + 0.02 g. Ind.-1. The fish were kept in a concrete tub of 100 cm x 150 cm x 70 cm with water volume of 750 liters tub-1. Stocking density of fish was 5 fish liters-1. Fish juveniles were fed with commercial feed with a dose of 3% of fish biomass with frequency of 3 times a day-1. Observation fish growth and water sampling for monitoring of the abundance of nitrogen-decomposing bacteria and water quality were carried out every 15 days. The results showed that the highest growth weight of catfish seedlings was found in treatment P1 (0.447±0.142b) compared with K (0.377±0.047a) and P2 (0.363±0.057a) treatment. The values of survival rate for K, P1 and P2 treatments were 51±8, 54±4 and 52±8, respectively. This result implies that no significant difference in the survival rates in all treatments.

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KEBUTUHAN PROTEIN PAKAN UNTUK PERFORMA OPTIMAL BENIH IKAN PATIN PASUPATI (PANGASIID)

Jurnal Riset Akuakultur ◽

10.15578/jra.13.1.2018.47-56 ◽

2018 ◽

Vol 13 (1) ◽

pp. 47

Author(s):

Evi Tahapari ◽

Jadmiko Darmawan

Keyword(s):

Survival Rate ◽

Growth Performance ◽

Protein Content ◽

Maximum Growth ◽

Feed Conversion ◽

Protein Retention ◽

Randomized Design ◽

Significant Difference ◽

Test Fish ◽

Feed Protein

Penelitian ini bertujuan untuk mendapatkan kandungan protein optimum pakan untuk menunjang pertumbuhan maksimal dalam pemeliharaan benih ikan patin pasupati. Penelitian dirancang menggunakan rancangan acak lengkap (RAL) dengan empat perlakuan dan tiga ulangan. Sebagai perlakuan adalah pakan dengan kandungan protein berbeda, yaitu: A. 30%, B. 35%, C. 40%, dan D. 45%. Wadah pemeliharaan ikan uji adalah bak fiber berukuran 57 cm x 36 cm x 29 cm. Sebanyak 30 ekor ikan uji berukuran bobot awal 0,94 ± 0,13 g dengan panjang awal 3,82 ± 0,21 cm; ditebar ke dalam setiap bak. Percobaan berlangsung selama empat puluh hari. Ikan diberi pakan lima kali/hari sebanyak 10% dari biomassa ikan. Parameter yang diamati adalah laju pertumbuhan bobot, pertumbuhan panjang, retensi protein, rasio konversi pakan, dan sintasan. Data dianalisis dengan analisis ragam pada selang kepercayaan 95% dan dilanjutkan dengan Uji Beda Nyata Terkecil (Uji BNT). Hasil penelitian menunjukkan bahwa pakan dengan kandungan protein 40% (perlakuan C) memberikan performa pertumbuhan bobot, pertambahan panjang, retensi protein, dan konversi pakan terbaik (P<0,05) dibandingkan dengan perlakuan lainnya. Sintasan ikan pada perlakuan A, B, dan C berturut-turut sebesar 81,11%; 80,00%; dan 80,00% dan tidak berbeda nyata (P>0,05). Ikan pada perlakuan D memiliki sintasan terendah yaitu 72,22%.This study was aimed to determine the optimum feed protein content to support maximum growth performance of catfish juveniles. The study was designed using a completely randomized design (CRD) with four treatments and three replications. The treatments consisted of different protein contents of artificial feed, namely: A. 30%, B. 35%, C. 40%, and D. 45%. The test fish were reared in fiber tank containers sized 57 cm x 36 cm x 29 cm. A total of 30 fish with an initial weight of 0.94 ± 0.13 g and length of 3.82 ± 0.21 cm were stocked into each tank. The experiment lasted for forty days. Fish were fed with the experimental feeds five times/day as much as 10% of the fish biomass. The parameters observed were weight growth rate, growth length, protein retention, feed conversion ratio, and survival rate. The data were analyzed by analysis of variance at 95% confidence interval and continued with the least significant difference (LSD) test. The results showed that the feed with a crude protein content of 40% (treatment C) gave the best growth performance, protein retention and feed conversion and significantly different compared with the other treatments (P <0.05). The survival rate of fish in treatment A, B, and C were 81.11%, 80.00%, and 80.00%, respectively which was not significantly different (P>0.05). Fish in the treatment D had the lowest survival rate (72.22%).

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Effect of enriching live feeds with HUFA on growth and survival of clownfish Amphiprion ocellaris (Cuvier, 1830) larvae

Tạp chí Khoa học và Công nghệ Biển ◽

10.15625/1859-3097/19/4a/14584 ◽

2019 ◽

Vol 19 (4A) ◽

pp. 191-199

Author(s):

Ho Son Lam ◽

Nguyen Thi Nguyet Hue ◽

Dinh Truong An ◽

Phan Thi Khanh

Keyword(s):

Survival Rate ◽

Production Efficiency ◽

Specific Growth ◽

Fish Larvae ◽

Control Diet ◽

Live Prey ◽

Growth And Survival ◽

Live Feed ◽

Live Feeds ◽

Set Up

The aims of this study was to evaluate the effect of HUFA-enriched live feed in rearing Nemo fish larvae (Amphiprion ocellaris), 5 treatments were set up (each treatment was repeated in triplicate) with 5 concentrations of HUFA (Super Selco) (0, 50, 100, 150 and 200 ppm). After 45 days of culture with HUFA-enriched live feeds of different concentrations, the total length-TL as well as the specific growth rate (SGRL) in body length and survival rate of Nemo fish larvae in the treatments had significant differences (p < 0.05). In the enriched live prey diet of 100 ppm Selco, TL, SGRL and the survival rate of Nemo fish larvae were the highest (10.01 ± 0.150 mm, 7.20 ± 0.099%/day and 82.67 ± 0.881%, respectively). Lowest TL, SGRL and survival rate were obtained in larvae fed with the control diet (8.65 ± 0.051 mm, 6.23 ± 0.041%/day and 68.70 ± 0.881%, respectively). The results of this experiment suggest that the optimal Selco concentration used to enrich live feeds for Nemo fish larvae is 100 ppm, which can improve the production efficiency of Nemo stock.

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