Use of Bottom Structure and Tank Cover during Rainbow Trout Rearing in Circular Tanks

Km, Crank; Krebs, Jared E.; Krebs, Eric; Me, Barnes

doi:10.4172/2332-2608.1000247

Cited by 10 publications

(14 citation statements)

References 20 publications

(38 reference statements)

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“…The use of vertically-suspended arrays as environmental enrichment is a recent development. In general, the suspension of vertical structures has improved feed conversion ratios and salmonid growth without disrupting circular tank self-cleaning [14] [22]. In contrast, White et al [23] did not observe improved hatchery rearing performance with the use of vertically-suspended arrays in juvenile Atlantic salmon (Salmo salar) during a 125 day study.…”

Section: Introductionmentioning

confidence: 98%

“…It has been used in an attempt to alter fish behavior and physiology to improve hatchery rearing performance or post-stocking survival [1]- [9]. Forms of environmental enrichment have included natural and artificial plants, sand and gra-vel substrate, wood, rocks, and concrete blocks [2] [4] [9]- [14]. While these supplements attempt to replicate a natural environment, they also disrupt the hydraulic self-cleaning of circular tanks.…”

Section: Introductionmentioning

confidence: 99%

“…While these supplements attempt to replicate a natural environment, they also disrupt the hydraulic self-cleaning of circular tanks. As a result, there may be a potential increase of disease outbreaks and increased labor requirements from hatchery staff [14] [15] [16] [17].…”

Section: Introductionmentioning

confidence: 99%

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Rearing Performance of Atlantic Salmon Grown in Circular Tanks with Vertically-Suspended Environmental Enrichment

Jones¹,

Krebs²,

Huysman³

et al. 2019

OJAS

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Environmental enrichment is the incorporation of materials into hatchery tanks to simulate a more natural rearing environment. This study investigated the use of a vertically-suspended plastic conduit array as enrichment in 3.63 m circular tanks during Atlantic salmon (Salmo salar) rearing. After 168 days, feed conversion ratio was significantly improved for salmon reared in tanks with enrichment compared to the barren control tanks. Final tank weights and weight gain were not significantly different, although the difference in mean gain of 182.0 kg in the enriched tanks compared to 162.9 kg in the control tanks approached significance. There were no significant differences in individual fish length, weight, or condition factor between the treatments, likely because of large variances in body size due to sexual dimorphism and small sample sizes. The suspended array did not interfere with the hydraulic self-cleaning of the circular tanks. The results of this study support the use of vertically-suspended structures to improve the hatchery rearing performance of Atlantic salmon in circular tanks.

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Section: Introductionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Rearing Performance of Atlantic Salmon Grown in Circular Tanks with Vertically-Suspended Environmental Enrichment

Jones¹,

Krebs²,

Huysman³

et al. 2019

OJAS

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show abstract

“…Environmental enrichment is the deliberate addition of materials or structures to otherwise sterile hatchery rearing units in order to potentially improve fish behavior, growth, and post stocking survival [1] . However, hatchery rearing units are typically devoid of internal structures to facilitate routine cleaning and other animal husbandry actions, and, in the case of circular tanks, the continuous removal of fish waste by rotational velocities [2][3][4][5][6] . Some enrichment techniques previously studied have consisted of woody or stony debris, plant or root material, plastic plants, or concrete blocks added to hatchery tanks [6][7][8][9][10][11][12][13] .…”

Section: Introductionmentioning

confidence: 99%

“…However, hatchery rearing units are typically devoid of internal structures to facilitate routine cleaning and other animal husbandry actions, and, in the case of circular tanks, the continuous removal of fish waste by rotational velocities [2][3][4][5][6] . Some enrichment techniques previously studied have consisted of woody or stony debris, plant or root material, plastic plants, or concrete blocks added to hatchery tanks [6][7][8][9][10][11][12][13] . However, despite their potential benefits, these types of enrichment features may trap food and feces or harbor pathogens, increasing the risk of disease or interfering with self-cleaning in circular tanks [14,15] .…”

Section: Introductionmentioning

confidence: 99%

Addition of Vertical Enrichment Structures Does Not Improve Growth of Three Salmonid Species during Hatchery Rearing

Barnes¹

2018

JMBA

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Environmental enrichment is the placement of structure or other modifications in typically sterile hatchery rearing units.This study investigated the use of vertically-suspended aluminum rod arrays in covered circular tanks on the rearing performance of brown trout (Salmo trutta), Chinook salmon (Oncorhynchus tshawytscha), and Atlantic salmon (Salmo salar) in separate trials lasting 59, 78, and 125 days respectively. No significant differences were observed in gain, feed conversion ratio, individual fish total length, or individual fish weight between the enriched and unenriched treatments in any of the three trials.In addition, vertically-suspended structure had no significant effect on Atlantic salmon relative fin length. These experiments are the first to indicate no benefits during the rearing of salmonids using vertically-suspended enrichment.

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Density affects rearing performance of juvenile landlocked fall Chinook Salmon

Rosburg,

Barnes

2024

N American J Aquac

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ObjectiveDensity‐related information for landlocked fall Chinook Salmon Oncorhynchus tshawytscha shortly after first feeding is poorly understood. This study was undertaken to determine the effects of a range of rearing densities (low, intermediate, and high) on rearing performance and survival of newly feed‐trained juvenile landlocked fall Chinook Salmon.MethodsThe fish were reared for 66 days in 1.8‐m (diameter) tanks with approximate volume of 2036 L at one of three loadings of approximately 2500, 5000, or 10,000 fish/tank.ResultThe initial and final densities for each of the three loadings were 0.73 and 8.93, 1.45 and 16.41, and 2.90 and 26.86 kg/m3, respectively. At the end of the study, the specific growth rates were significantly lower, total lengths were significantly shorter, and feed conversion ratios were significantly greater in the fish from the highest‐density treatment relative to the fish in the other treatments. Percentage of weight gain, final weights, and condition factor were significantly reduced in fish from the highest‐density treatment relative those at the lowest density. There were no significant differences in any growth metrics between fish that were reared at the lowest and intermediate densities. The intermediate density (5000 fish/tank) produced intermediate results that did not significantly differ from either the highest or lowest densities. Mortality was not significantly different among the density treatments.ConclusionAn initial loading of 5000 fish in 1.8‐m (diameter) circular tanks, corresponding to initial and final densities of 1.45 and 16.41 kg/m3, respectively, is recommended to minimize the detrimental effects of density on newly feeding Chinook Salmon while maximizing their production in often limited hatchery space.

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Use of Bottom Structure and Tank Cover during Rainbow Trout Rearing in Circular Tanks

Cited by 10 publications

References 20 publications

Rearing Performance of Atlantic Salmon Grown in Circular Tanks with Vertically-Suspended Environmental Enrichment

Rearing Performance of Atlantic Salmon Grown in Circular Tanks with Vertically-Suspended Environmental Enrichment

Addition of Vertical Enrichment Structures Does Not Improve Growth of Three Salmonid Species during Hatchery Rearing

Density affects rearing performance of juvenile landlocked fall Chinook Salmon

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