Rearing Velocity Impacts on Landlocked Fall Chinook Salmon (&amp;lt;i&amp;gt;Oncorhynchus tshawytscha&amp;lt;/i&amp;gt;) Growth, Condition, and Survival

Parker, Timothy M.; Barnes, Michael E.

doi:10.4236/ojas.2014.45031

Cited by 23 publications

(26 citation statements)

References 26 publications

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“…Similar to the results of this study, where Rainbow Trout growth was negatively affected by the 2.75 BL/s rearing velocity, Parker and Barnes (2014) observed reduced growth and poorer feed conversion in Chinook Salmon O.tshawytscha reared in circular tank velocities of 3.0 BL/s versus in lower velocities of 0.5 and 1.5 BL/s, and Kiessling et al (1994) reported a decrease in food conversion with increases in swimming speed. Leon (1986) also observed similar growth decreases and feed conversion increases in Brook Trout Salvelinus fontinalis reared at higher velocities.…”

Section: Discussionsupporting

confidence: 90%

Structural Complexity Improves the Rearing Performance of Rainbow Trout in Circular Tanks

Kientz

Barnes

2016

N American J Aquac

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While structural complexity has been used extensively during hatchery rearing in an attempt to improve poststocking survival, the potential impact of this complexity on hatchery rearing performance has largely been ignored. This study examined the growth and condition of juvenile Rainbow Trout Oncorhynchus mykiss reared in nearly fully covered circular tanks containing nine vertically oriented round aluminum rods (structurally complex) compared with that of trout reared in almost fully covered tanks with no rods (control) at two water velocities (2.0 body length (BL)/s and 2.75 BL/s). After 51 days, total tank weight gain was significantly higher in the structurally complex tanks than in the control tanks, regardless of water velocity. The feed conversion ratio was also significantly better in the structurally complex tanks [mean (SD) 1.25 (0.10)] than in the control tanks [1.66 (0.41)]. There were no significant differences in hepatosomatic index, splenosomatic index, and viscerosomatic index between the fish from the structurally complex and the control tanks. Total tank weight gain was significantly higher and the feed conversion ratio significantly lower in the lower water velocity tanks than in the higher water velocity tanks. These results indicate that vertically oriented aluminum rods can be used to increase structural complexity and improve Rainbow Trout rearing performance in circular rearing tanks, with minimal effects on regular tank cleaning.

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Section: Discussionsupporting

confidence: 90%

Structural Complexity Improves the Rearing Performance of Rainbow Trout in Circular Tanks

Kientz

Barnes

2016

N American J Aquac

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“…It would also explain the more pronounced effects of rods at higher velocities observed by Kientz and Barnes [7]. While some water velocity has been shown to improve fish growth and feeding efficiency [8,9], higher velocities can lead to decreased rearing performance [10,11] due to excessive energy requirements [2].…”

Section: Discussionmentioning

confidence: 80%

Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Moine¹,

Me²,

Kientz³

et al. 2016

J Fisheries Livest Prod

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“…Oxygen consumption of Sockeye Salmon O. nerka and Chinook Salmon increases as swimming speed increases (Brett and Glass 1973;Gallaugher et al 2001), and Chinook Salmon food utilization efficiency decreases with increased swimming speeds (Kiessling et al 1994). Additionally, Parker and Barnes (2014) demonstrated that Chinook Salmon had reduced growth and poorer feed conversion when forced to swim 3.0 BL/s compared with 0.5 and 1.5 BL/s. The poorer growth and feed conversion of the trout fed restricted rations swimming at 1.5 and 3.0 BL/s in our study is probably due to energy being allocated toward swimming, thereby reducing the net energy available for growth and consequently increasing feed conversion ratios.…”

Section: Discussionmentioning

confidence: 99%

Effects of Different Water Velocities on the Hatchery Rearing Performance and Recovery from Transportation of Rainbow Trout Fed Two Different Rations

Parker

Barnes

2015

Trans Am Fish Soc

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We examined the effects of exercise on hatchery rearing performance and posttransportation stress recovery, growth, and survival of Rainbow Trout Oncorhynchus mykiss reared for 9 weeks in one of three water velocities (0.5, 1.5, or 3.0 body lengths (BL)/s) and fed either a restricted ration or to satiation. The influence of previous exercise regimes on survival, growth, and stress recovery for 8 weeks after transportation of the fish fed a restricted ration was also evaluated. During hatchery rearing, reduced growth and poorer food conversion ratios at higher velocities (1.5 and 3.0 BL/s) were only observed in restricted ration-fed fish, with satiation-fed fish exhibiting no differences in hatchery rearing performance among the water velocities. Condition factor changed with exercise regime and was significantly greater in restricted ration-fed fish at 3.0 BL/s and satiation-fed fish at 1.5 and 3.0 BL/ s. Hepatosomatic index was unaffected by exercise but was significantly greater in the fish fed to satiation, whereas the viscerosomatic index was not significantly affected by either exercise or ration. Hematocrit was also unaffected by exercise but was significantly lower in fish fed to satiation. Cortisol levels after 9 weeks of hatchery rearing were the same for all exercise regimes regardless of feed ration. Cortisol levels after transportation were also the same for all exercise regimes and cortisol levels returned to pretransportation levels within 24 h. Growth and survival after transportation were the same for all fish regardless of their previous exercise regime. These results indicate that that fish can be reared using adequate velocity to maintain the self-cleaning properties of hatchery tanks without fear of negatively affecting fish condition or posttransportation performance, although exercise should be paired with adequate food intake to avoid decreased hatchery growth and elevated food conversion ratios.

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Rearing Velocity Impacts on Landlocked Fall Chinook Salmon (<i>Oncorhynchus tshawytscha</i>) Growth, Condition, and Survival

Cited by 23 publications

References 26 publications

Structural Complexity Improves the Rearing Performance of Rainbow Trout in Circular Tanks

Structural Complexity Improves the Rearing Performance of Rainbow Trout in Circular Tanks

Flow Patterns in Circular Rearing Tanks Containing Vertical Structure

Effects of Different Water Velocities on the Hatchery Rearing Performance and Recovery from Transportation of Rainbow Trout Fed Two Different Rations

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