Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Moine, Jerome Le; Me, Barnes; Kientz, J; Simpson, Greer

doi:10.4172/2332-2608.1000204

Cited by 5 publications

(10 citation statements)

References 11 publications

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“…The alteration of water velocity behind the suspended conduit array may be responsible for the positive affect on Atlantic salmon feed conversion ratio observed in this study. Moine et al [28] and Muggli et al [29] reported that vertically-suspended structure arrays produce significant changes in circular tank water velocity profiles, with decreased water velocities behind the arrays. These lower velocity microhabitats likely positively influence fish energy expenditure [18] Routine fish husbandry demands were not negatively affected by the use of the conduit arrays in this study.…”

Section: Discussionmentioning

confidence: 99%

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: Discussionmentioning

confidence: 99%

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

Jones¹,

Krebs²,

Huysman³

et al. 2019

OJAS

View full text Add to dashboard Cite

show abstract

“…Vertically-suspended environmental enrichment dramatically changes circular tank flow dynamics [25,26]. These changes likely lead to bio-energetic benefits by creating lower velocity microhabitats favorable to juvenile salmonids [27].…”

Section: Discussionmentioning

confidence: 99%

Use of Two Vertically-Suspended Environmental Enrichment Arrays during Rainbow Trout Rearing in Circular Tanks

2019

International Journal of Innovative Studies in Aquatic Biology

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“…The effects of vertically-suspended structures on circular tank water velocity profiles have been reported by Moine et al [14] and Muggli et al [15]. However, both studies used 1.8-m diameter tanks and suspended arrays of small aluminum rods.…”

Section: Introductionmentioning

confidence: 88%

“…However, circular tank water flow patterns can be influenced by tank dimensions, water inlet structure geometry, outlet structure numbers and locations, fish numbers and sizes, and incoming water velocity and flow [3] [9] [10] [12] [13]. Environmental enrichment present in the circular tank can also significantly affect velocity profiles [14] [15].…”

Section: Introductionmentioning

confidence: 99%

“…However, both studies used 1.8-m diameter tanks and suspended arrays of small aluminum rods. Neither Moine et al [14] nor Muggli et al [15] examined the interaction of fish and vertically-suspended enrichment; all of their measurements were in tanks devoid of fish. Given that tank size, the presence of fish, and environmental enrichment structures can all impact within-tank water velocity profiles [9] [12] [14] [15] [36], additional information on circular tank water flow patterns in larger tanks containing fish with different environmental enrichment structures is needed.…”

Section: Introductionmentioning

confidence: 99%

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Impact of Vertically-Suspended Environmental Enrichment and Two Densities of Fish on Circular Tank Velocity Profiles

Caasi¹,

Barnes²,

Barnes³

2020

ENG

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Vertically-suspended environmental enrichment has been shown to produce improvements in fish growth during hatchery rearing in circular tanks. This study documented the effects of a novel suspended structure on the velocity profile of a 3.63-m diameter circular tank containing juvenile landlocked fall Chinook salmon (Oncorhynchus tshawytscha) at two different densities (9.0 and 34.3 kg/m 3). The addition of vertically-suspended structure to the tank significantly decreased velocities at nearly every sampling point, with velocities typically dropping from 15 cm/s without structure to less than 6 cm/s when structure was present. Fish density also significantly impacted in-tank velocities, with an inverse relationship observed between the density of fish and water velocity. Significant interactions were present among the presence or absence of structure and fish density. When structure and fish were absent, the velocity at the edge of the tank was 15.63 cm/s, which was significantly higher than the 4.75 cm/s velocity when both structure and the lower fish density were added, which was in turn significantly higher than the 2.29 cm/s velocity observed with structure and higher fish density. Despite the potentially unique features of this study, vertically-suspended environmental enrichment and the presence of fish clearly alter circular tank water velocities, which may at least partially explain the improvements in fish rearing performance observed with the use of suspended structure.

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Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Cited by 5 publications

References 11 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

Use of Two Vertically-Suspended Environmental Enrichment Arrays during Rainbow Trout Rearing in Circular Tanks

Impact of Vertically-Suspended Environmental Enrichment and Two Densities of Fish on Circular Tank Velocity Profiles

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