scholarly journals Stocking density and its influence on the productivity of red cusk eel, Genypterus chilensis (Guichenot, 1848), in shallow raceways

2020 ◽  
Vol 48 (5) ◽  
pp. 818-825
Author(s):  
Atle Foss ◽  
Albert K.D. Imsland ◽  
Felipe A. Briceño ◽  
Spartaco Magnolfi ◽  
Piero Magnolfi ◽  
...  
Keyword(s):  
Growth Rates ◽  
Rank Correlation ◽  
Stocking Density ◽  
Feed Conversion ◽  
Growth Properties ◽  
Size Rank ◽  
Specific Growth Rates ◽  
Significant Size ◽  
Growth Trial ◽  
Genypterus Chilensis

We compared the growth properties of red cusk eel Genypterus chilensis with initial mean weight ± standard error, 106.2 ± 6.1 g reared in shallow raceways at three different stocking densities (28.5, 46.1, and 60.7 kg m-3) in a 226-day long growth trial at a constant temperature of 17°C. There was a trend towards higher specific growth rates at the highest density. Final mean weights were 333 ± 12, 352 ± 12, and 354 ± 15 g, at the 30, 45, and 60 kg m-3 density, respectively. Overall, the growth rates were higher in the 60 kg m-3 density group than the two other density groups. The daily feeding intake (%) was higher in the medium (0.51), and high (0.55) density groups compared the low-density group (0.45). Feed conversion efficiency (FCE) did not differ between the density groups. A significant size rank correlation was maintained in all density groups throughout the study. Calculated productivity increased almost linearly with increasing stocking density and was found to be 32, 34, and 39 g m-2 d-1 at 30, 45, and 60 kg m-3, respectively. The results show that the optimum density conditions for farming juvenile red cusk eel, both concerning growth rate, feed conversion, and productivity is at densities equal to or higher than 60 kg m-3.

scholarly journals The use of river hopper barges as facilities for aquaculture: The growth characteristics of carp (Cyprinus carpio) depending on stocking density

2010 ◽  
Vol 55 (2) ◽  
pp. 147-155
Author(s):  
Stefan Skoric ◽  
Branislav Mickovic ◽  
Slobodan Regner ◽  
Zeljka Visnjic-Jeftic ◽  
Aleksandar Hegedis
Keyword(s):  
Cyprinus Carpio ◽  
Growth Rates ◽  
Specific Growth ◽  
Stocking Density ◽  
Growth Characteristics ◽  
Significant Difference ◽  
Weight Distributions ◽  
Carp Cyprinus Carpio ◽  
Specific Growth Rates

Carps (Cyprinus carpio) were farmed on a river hopper barge at two stocking densities, 10 and 20 individuals per m3. A comparison of average weights, specific growth rates and weight distributions was performed. The obtained results show that there was no statistically significant difference in any of the parameters studied with regard to stocking density.

scholarly journals PEMANFAATAN IKAN RUCAH ZERO WASTE SEBAGAI PAKAN DALAM PEMELIHARAAN IKAN KUWE DI KERAMBA JARING APUNG DUSUN WAEL KABUPATEN SERAM BAGIAN BARAT

2021 ◽  
Vol 17 (1) ◽  
pp. 18-24
Author(s):  
Damaris Payung ◽  
Irawati Irawati
Keyword(s):  
Growth Rate ◽  
Survival Rate ◽  
Growth Rates ◽  
Feed Efficiency ◽  
Stocking Density ◽  
Fish Farming ◽  
Seed Selection ◽  
Feed Conversion ◽  
Trash Fish ◽  
Marine Fish Farming

Feed stands a significant factor in determining the success of a cultivation business. One type of feed used in marine fish farming is trash fish. The objectives of this study were 1) to determine the growth rate of trevally fish after feeding trash fish, 2) to analyze the feed conversion and efficiency of feeding trash fish, and 3) to analyze the survival rate of trevally fish by feeding trash fish in Wael Village, Westen Seram Regency. The research was conducted in May-November 2020, located in Wael Village, Minapolitan Region, Westen Seram Regency. The method used was the observation through the stages of seed selection, seed maintenance and feeding. The success of the feed given will be analyzed through the growth rates of trevally fishes that have been given feed, feed efficiency, feed conversion and survival rate of trevally fish. The results showed that the growth rate of trevally fish was 1.73% and it was classified as good. This is influenced by the stocking density which was carried out in accordance with the area of ​​the container and the needs of the fish so that the trevally fish can grow well. The feed conversion values ​​and feed efficiency were 2.97 and 33.3%, respectively. The results of the feed conversion are categorized as still feasible for a trevally fish cultivation business. The survival of trevally fish is 90-95%, this is due to the regular management of feeding, the daily control, as well as stocking density that is not too high.   ABSTRAK Pakan merupakan faktor yang sangat penting dalam menentukan keberhasilan suatu usaha budidaya. Salah satu jenis pakan yang digunakan dalam kegiatan budidaya ikan laut adalah ikan rucah.  Tujuan penelitian ini adalah 1) mengetahui laju pertumbuhan ikan kuwe setelah pemberian pakan ikan rucah, 2) menganalisis konversi pakan serta efisiensi pemberikan pakan ikan rucah, dan 3) menganalisis tingkat kelangsungan hidup ikan kuwe dengan pemberian pakan ikan rucah di Dusun Wael, Kabupaten Seram Bagian Barat. Penelitian dilakukan pada bulan Mei-Nopember 2020 yang berlokasi di Dusun Wael Kawasan Minapolitan Kabupaten Seram Bagian Barat. Metode yang digunakan yaitu metode observasi melalui tahapan seleksi benih, pemeliharaan benih dan pemberian pakan. Keberhasilan pakan yang diberikan akan dianalisa melalui laju pertumbuhan ikan kuwe yang telah diberikan pakan, efisiensi pakan, konversi pakan serta kelangsungan hidup ikan kuwe. Hasil penelitian menunjukan laju pertumbuhan ikan kuwe sebesar 1,73% dan tergolong baik. Hal ini dipengaruhi oleh padat tebar yang dilakukan sesuai dengan luas wadah dan kebutuhan ikan sehingga ikan kuwe dapat bertumbuh dengan baik. Nilai konversi pakan dan efisiensi pakan masing-masing sebesar 2,97 dan 33,3%. Hasil konversi pakan dikategorikan masih layak bagi suatu usaha budidaya ikan kuwe. Kelangsungan hidup ikan kuwe sebesar 90-95%, hal ini disebabkan karena manajemen pemberian pakan yang teratur, pengontrolan yang dilakukan setiap hari, serta padat tebar yang tidak terlalu tinggi.   Kata Kunci : Pakan, ikan rucah, konversi pakan, efisiensi pakan, Caranx sexfasciatus

THE INFLUENCE OF TEMPERATURE AND GENOTYPE ON THE GROWTH RATE OF HATCHERY-REARED SALMONIDS

1986 ◽  
Vol 66 (3) ◽  
pp. 599-606 ◽  
Author(s):  
S. E. SADLER ◽  
G. W. FRIARS ◽  
P. E. IHSSEN
Keyword(s):  
Growth Rate ◽  
Rainbow Trout ◽  
Growth Rates ◽  
Brook Trout ◽  
Lake Trout ◽  
Specific Growth ◽  
Strain Differences ◽  
Salmo Gairdneri ◽  
Feed Conversion ◽  
Specific Growth Rates

Growth rates of three salmonid species, brook trout (Salvelinus fontinalis), lake trout (S. namaycush), and rainbow trout (Salmo gairdneri) and one hybrid, splake (S. namaycush × S. fontinalis) were compared at 10 and 16 °C. Two strains of each species, and one of the splake hybrid were examined. At 10 °C the ranking of specific growth rate from highest to lowest for species was: rainbow trout, lake trout, splake, brook trout. At 16 °C the order was: brook trout, rainbow trout, splake, and lake trout. Brook trout, rainbow trout and splake had significantly higher specific growth rates at 16 °C but lake trout showed no difference at the two temperatures. Strain differences were significant in lake trout and rainbow trout, but not in brook trout. Rainbow trout showed a significant strain by temperature interaction. The ranking of feed conversion efficiencies from best to poorest was: lake trout, 10 °C; splake, 10 °C; brook trout, 16 °C; splake, 16 °C; rainbow trout, 16 °C; rainbow trout, 10 °C; lake trout, 16 °C; brook trout, 10 °C. Key words: Temperature, genetics, growth, salmonids, aquaculture

scholarly journals Mortality Patterns in a Commercial Wean-To Finish Swine Production System

2019 ◽  
Vol 6 (2) ◽  
pp. 49 ◽  
Author(s):  
Samantha Mehling ◽  
Alexandra Henao-Diaz ◽  
Jeremy Maurer ◽  
Ed Kluber ◽  
Rachel Stika ◽  
...  
Keyword(s):  
Production System ◽  
Average Daily Gain ◽  
Stocking Density ◽  
Study Data ◽  
Average Weight ◽  
Feed Conversion ◽  
Complex Process ◽  
Routine Monitoring ◽  
Phase Cluster ◽  
Biological Performance

Modern commercial pig production is a complex process that requires successful producers to understand and resolve factors associated with perturbations in production. One important perturbation is inventory loss due to mortality. In this study, data on 60 lots of approximately 2000 weaned pigs (n = 115,213) from one commercial production system were collected through the wean-to-finish (WTF) cycle with the objective of establishing patterns of mortality, estimating differences in profit/loss among patterns of mortality, and identifying production practices associated with mortality patterns. Information provided by the production system included the number of pigs in each lot at the time of placement (beginning inventory), weaning weight, barn dimensions, number of dead pigs (NDP) daily, capacity placed (proportion pigs actually placed versus what had been planned to be placed) and average weight sold. Analysis of NDP revealed three mortality patterns (clusters I, II, III) composed of 6, 40, and 14 lots, respectively, that differed in the temporal onset and/or level of mortality. Average daily gain (ADG) and feed conversion ratio (FCR) were calculated by growth phase for each cluster. An economic model showed profit differences among clusters due to poor biological performance by clusters I and III in the late finishing phase. Cluster II (n = 40) had fewer dead pigs and the highest profit compared to clusters I (n = 6) and III (n = 14). Area per pig (stocking density) was the only factor associated with the differences in mortality patterns. Routine monitoring and the analysis of mortality patterns for associations with production and management factors can help swine producers improve biological performance and improve profit.

Effects of turbidity on prey consumption and growth in brook trout and implications for bioenergetics modeling

2001 ◽  
Vol 58 (2) ◽  
pp. 386-393 ◽  
Author(s):  
John A Sweka ◽  
Kyle J Hartman
Keyword(s):  
Growth Rates ◽  
Brook Trout ◽  
Specific Growth ◽  
Abiotic Factors ◽  
Foraging Strategies ◽  
Turbid Water ◽  
Daily Consumption ◽  
Consumption Rates ◽  
The Difference ◽  
Specific Growth Rates

Brook trout (Salvelinus fontinalis) were held in an artificial stream to observe the influence of turbidity on mean daily consumption and specific growth rates. Treatment turbidity levels ranged from clear (<3.0 nephelometric turbidity units (NTU)) to very turbid water (> 40 NTU). Observed mean daily specific consumption rates were standardized to the mean weight of all brook trout tested. Turbidity had no significant effect on mean daily consumption, but specific growth rates decreased significantly as turbidity increased. Brook trout in turbid water became more active and switched foraging strategies from drift feeding to active searching. This switch was energetically costly and resulted in lower specific growth rates in turbid water as compared with clear water. Bioenergetics simulations were run to compare observed growth with that predicted by the model. Observed growth values fell below those predicted by the model and the difference increased as turbidity increased. Abiotic factors, such as turbidity, which bring about changes in the activity rates of fish, can have implications for the accuracy of predicted growth by bioenergetics models.

Sex Ratio and Sex-Specific Growth Rates of Immature Green Turtles, Chelonia mydas, in the Southern Bahamas

Copeia ◽  
1992 ◽  
Vol 1992 (4) ◽  
pp. 1098 ◽  
Author(s):  
Alan B. Bolten ◽  
Karen A. Bjorndal ◽  
Janice S. Grumbles ◽  
David W. Owens
Keyword(s):  
Sex Ratio ◽  
Growth Rates ◽  
Specific Growth ◽  
Chelonia Mydas ◽  
Green Turtles ◽  
Specific Growth Rates

Physiological and cell morphology adaptation ofBacillus subtilisat near-zero specific growth rates: a transcriptome analysis

2014 ◽  
Vol 17 (2) ◽  
pp. 346-363 ◽  
Author(s):  
Wout Overkamp ◽  
Onur Ercan ◽  
Martijn Herber ◽  
Antonius J. A. van Maris ◽  
Michiel Kleerebezem ◽  
...  
Keyword(s):  
Cell Morphology ◽  
Transcriptome Analysis ◽  
Growth Rates ◽  
Specific Growth ◽  
Specific Growth Rates

Cost-effectiveness, feed utilization and body composition of african sharptooth catfish (Clarias gariepinus, Burchell 1822) fingerlings fed locally formulated and commercial pelleted diets in tarpaulin tanks

2018 ◽  
Vol 26 (1) ◽  
pp. 39-52
Author(s):  
O.E. Afia ◽  
G.S. David
Keyword(s):  
Cost Effectiveness ◽  
Proximate Composition ◽  
Clarias Gariepinus ◽  
Stocking Density ◽  
Food Utilization ◽  
Feed Conversion ◽  
Efficiency Ratio ◽  
Commercial Diet ◽  
Commercial Feed ◽  
African Sharptooth Catfish

Cost-effectiveness, food utilization and proximate composition of Clarias gariepinus fingerlings fed locally formulated (sinking) and commercial (floating) diets in tarpaulin tanks were observed for 56 days. Ninety (90) C. gariepinus fingerlings with initial mean weight (72.99 g ± 3.09) per treatment were observed during the period with three replicates at a stocking density of 15 fish per m2. The fish were fed 5% body weight three times daily. Results showed that C. gariepinus fingerlings fed floating diet had significantly lower (p<0.05) feed conversion ratio (0.83 ± 0.03) than sinking diet (3.23 ± 0.40). Protein efficiency ratio was significantly (p<0.05) higher in fish fed commercial diet (2.69 ± 0.09) than locally formulated (0.80 ± 0.11). Specific growth rate was significantly (p<0.05) higher in floating (3.29 ± 0.07) than sinking diet (0.97 ± 0.20). Incidence cost was lower (₦1,989.65) in fish fed commercial diet than locally formulated (₦3,819.63). The profit index was higher in C. gariepinus fed floating diet (0.74) than sinking (0.19). From these findings, floating (commercial) feed is recommended for feeding C. gariepinus fingerlings since it showed better food utilization, better proximate composition of the carcass, higher profit index and consequently lower incidence cost.Keywords: Clarias gariepinus, cost-effectiveness, sinking feed, floating feed, incidence cost.

scholarly journals Investigation of the Biological Treatability of Pistachio Processing Industry Wastewaters in a Batch-operated Aerobic Bioreactor

2021 ◽  
Author(s):  
Sevtap Tırınk ◽  
Alper Nuhoğlu ◽  
Sinan Kul
Keyword(s):  
Kinetic Parameters ◽  
Growth Rates ◽  
Specific Growth ◽  
Batch Reactor ◽  
The Other ◽  
Batch Experiments ◽  
Processing Industry ◽  
Specific Growth Rates ◽  
Biological Treatability ◽  
Best Fit

Abstract This study encompasses investigation of treatment of pistachio processing industry wastewaters in a batch reactor under aerobic conditions, calculation of kinetic parameters and comparison of different inhibition models. The mixed microorganism culture used in the study was adapted to pistachio processing industry wastewaters for nearly one month and then concentrations from 50-1000 mg L− 1 of pistachio processing industry wastewaters were added to the medium and treatment was investigated in batch experiments. The Andrews, Han-Levenspiel, Luong and Aiba biokinetic equations were chosen for the correlations between the concentration of pistachio processing industry wastewaters and specific growth rates, and the kinetic parameters in these biokinetic equations were calculated. The µmax, Ks and Ki parameters, included in the Aiba biokinetic equation providing best fit among the other equations, had values calculated as 0.25 h− 1, 19 mg L− 1, and 516 mg L− 1, respectively.

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