scholarly journals Integrated Culture of Oncorhynchus mykiss (Rainbow Trout) in Pre-Cordilleran Sector under a Recirculation System in Northern Chile

2021 ◽  
Author(s):  
Renzo Pepe-Victoriano ◽  
Héctor Aravena-Ambrosetti ◽  
Piera Pepe-Vargas
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Average Weight ◽  
Northern Chile ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Flow Capacity ◽  
Recirculation System ◽  
Uv Lamp ◽  
The City

An experience of integral farming of Oncorhynchus mykiss (rainbow trout) is carried out in Copaquilla, 90 kilometers inland from the city of Arica at 3,000 mamsl. The system used was the Recirculating Aquaculture System (RAS), which had six ponds of 40 mt3 each, two decanters with a capacity of 3.5 mt3 and a biofilter of 3.5 mt3 with substrate for the fixation of ammonium and nitrite transforming bacteria. The three latter ponds were buried below the lowest level of the fattening ponds. Three pumps, two running and one 1.5 hp. backup, plus a 1 hp. blower, were the water and air equipment utilized in the system. Each pump had a flow capacity of 450 lt min−1. This water was sucked from the biofilter and transferred to the accumulator tank with a capacity of 10 mt3. From there it was distributed by gravity to the fattening ponds. In addition, the juvenile system had a particular SAR with a 0.5 hp. pump, a small 0.2 hp. blower and an 80 watt UV lamp. The grow-out SAR received 6,000 trout with an average weight of 15 grams. The group reached approximately 1,200 grams over a year. Thirty fish were selected for reproduction. Eggs were obtained, followed by fry, juveniles and adults. This initiative demonstrated the effectiveness of producing trout in the foothills of the interior city of Arica, Chile.

scholarly journals Evaluation of Growth Performance of a Genetically Characterized F1 Rainbow Trout, <i>Oncorhynchus mykiss</i> in a Recirculating Aquaculture System

2017 ◽  
Vol 08 (07) ◽  
pp. 716-728
Author(s):  
José Luis Arredondo-Figueroa ◽  
Nayeli Ismene Armendáriz-Sáenz ◽  
Laura Georgina Núñez-García ◽  
Jesús Trinidad Ponce-Palafox ◽  
Irene De Los Angeles Barriga-Sosa
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Growth Performance ◽  
Recirculating Aquaculture System ◽  
Recirculating Aquaculture ◽  
Aquaculture System

scholarly journals Cortisol and testosterone accumulation in a low pH recirculating aquaculture system for rainbow trout (Oncorhynchus mykiss )

2016 ◽  
Vol 48 (7) ◽  
pp. 3579-3588 ◽  
Author(s):  
Vasco C Mota ◽  
Catarina I M Martins ◽  
Ep H Eding ◽  
Adelino V M Canário ◽  
Johan A J Verreth
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Low Ph ◽  
Recirculating Aquaculture System ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Recirculating Aquaculture ◽  
Aquaculture System

scholarly journals Effects of Low Stocking Densities on Zootechnical Parameters and Physiological Responses of Rainbow Trout (Oncorhynchus mykiss) Juveniles

Biology ◽  
2021 ◽  
Vol 10 (10) ◽  
pp. 1040
Author(s):  
Jérôme Roy ◽  
Frederic Terrier ◽  
Michael Marchand ◽  
Alexandre Herman ◽  
Cécile Heraud ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Feed Efficiency ◽  
Physiological Responses ◽  
Stocking Density ◽  
Average Weight ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Recirculating Aquaculture ◽  
Immune Biomarkers ◽  
Immune Related Genes

The present study investigated the effect of low stocking density on growth, survival, feed parameters and physiological responses (blood metabolites, welfare indicators, immune biomarkers, and transcriptomic responses of stress and immune-related genes) on juvenile rainbow trout (Oncorhynchus mykiss) reared under a recirculating aquaculture system during 12 weeks. Fish (average weight 29.64 g) were reared in triplicate under four initial densities: nine fish per tank (D9, 3.76 ± 0.06 kg/m3), 18 fish per tank (D18, 7.66 ± 0.18 kg/m3), 27 fish per tank (D27, 9.67 ± 0.01 kg/m3) and 36 fish per tank (D36, 12.94 ± 0.14 kg/m3). Results showed that lower stocking density D9 significantly altered survival with several fish dying during the experiment and an alteration of growth and feed efficiency for the remaining fish. In parallel, the study revealed that low stocking density induced a chronic stress altering the physiological responses of trout by dysregulation of the inflammatory, immune system, and indolamine/catecholamine brain levels. In conclusion, regarding all the variables observed, low stocking density (D9) alters survival, growth and feed efficiency of rainbow trout with alteration of their physiological responses. Selecting appropriate fish density relating to rearing conditions proved to be an essential concern to improve welfare in an aquaculture context.

scholarly journals Video surveillance methods to evaluate individual feeding response in rainbow trout (Oncorhynchus mykiss, Walbaum)—implications for feeding regime optimisation

2021 ◽  
Author(s):  
Philip Niclas Just ◽  
Bernd Köllner ◽  
Matthew James Slater
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Video Surveillance ◽  
Average Weight ◽  
Short Term ◽  
Feeding Regime ◽  
Daily Feeding ◽  
Juvenile Rainbow Trout ◽  
Feeding Regimes ◽  
The Impact

AbstractPrecisely analysing and optimising feeding regimes is central to salmonid growth performance and delivery of special diets. The current study developed novel video surveillance methods and analysis techniques to assess individual feed intake and minimum pellet intake (MPI) in individually identified juvenile rainbow trout, Oncorhynchus mykiss. Three trials were conducted to test the impact of short-term starvation (N=112 [16 tanks, 7 fish per tank], average weight=27.1±3.4g, age= 119 days), portion numbers per feeding (N=105 [15 tanks, 7 fish per tank], average weight=22.8±2.1g, age= 99 days) and varied numbers of daily feeding events (N=84 [12 tanks, 7 fish per tank], average weight=32.4±3.3g, age= 133 days). All trails were carried out in a recirculating aquaculture system with 20 tanks held at 15 ± 0.5°C. All individuals were code-tagged and high quality video images were taken and analysed to identify all feeding interactions. Individual trout feeding activity under different feeding regimes could be precisely analysed with the video methods developed. Moving from one to two daily feeding events doubled pellet intake per fish from 27.4 ± 5.8 to 52.8 ± 11.5 pellets. Pellet intake (58.8 ± 24.2 pellets) did not increase at three daily feeding events but became more variable across fish. MPI nearly doubled to 30 pellets in fish receiving two daily feeding events (MPI30: chi-squared = 8.74, df = 2, p = 0.01). Short-term starvation had no influence on intake (28 ± 8 pellets/fish) or MPI. Increasing portion number from one (27.8 ± 7.4 pellets fish−1) to two (31.1 ± 7.4 pellets fish−1) or more did not significantly increase the number of ingested pellets. Adjusting the feeding regime by increasing daily feeding events to two, possibly combined with multiple portions, can increase pellet intake and reduce the heteroscedasticity of pellet intake. The methods presented in this study are viable for analysing feeding regimes for juvenile rainbow trout and controlled feedstock/supplement delivery. Implications for analyses with other species and for vaccination optimisation are discussed.

Welfare assessment of rainbow trout reared in a Recirculating Aquaculture System: Comparison with a Flow-Through System

Aquaculture ◽  
2015 ◽  
Vol 436 ◽  
pp. 151-159 ◽  
Author(s):  
Violaine Colson ◽  
Bastien Sadoul ◽  
Claudiane Valotaire ◽  
Patrick Prunet ◽  
Matthieu Gaumé ◽  
...  
Keyword(s):  
Rainbow Trout ◽  
Recirculating Aquaculture System ◽  
Welfare Assessment ◽  
Recirculating Aquaculture ◽  
Aquaculture System ◽  
Flow Through
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