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

doi:10.20431/2454-7670.0501005

Cited by 10 publications

(5 citation statements)

References 17 publications

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“…Despite the relatively high loading densities, the feed conversion ratios observed in this experiment are similar to those previously reported for rainbow trout [25] [45]. At 2.3 to 2.6, the specific growth rates, which is basically the percentage growth per day of fish, in this study were also similar to those reported by Huysman et al [32] and Voorhees et al [45]. Condition factors were also similar to those reported previously for rainbow trout [25]…”

Section: Discussionsupporting

confidence: 91%

Use of Exercise and Structure during Rainbow Trout Rearing

Voorhees¹,

Huysman²,

Krebs³

et al. 2020

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A combination of two forms of environmental enrichment (in-tank structure and exercise) was evaluated during the hatchery rearing of juvenile rainbow trout Oncorhynchus mykiss. The study used four treatments: 1) neither exercise nor structure, 2) exercise without structure, 3) structure without exercise, and 4) both exercise and structure. Velocities in the unexercised tanks were a constant 12.2 cm•s −1. Velocities in the exercised tanks alternated weekly with one week at 12.2 cm•s −1 followed by a week at 30.5 cm•s −1. Structural enrichment consisted of an array of vertically-suspended aluminum angles. The use of either environmental enrichment technique significantly improved final tank weight, gain, percent gain, and specific growth rate. Feed conversion ratio was significantly and positively influenced only by structure, but fish on the exercise routine were overfed. There were no significant interactions between exercise and structure, indicating that each form of environmental enrichment operates independently. The results of this study indicate fish rearing performance can be improved with the addition of either vertically-suspended aluminum angles or an exercise routine, but the combination of the two techniques may not be needed to improve rainbow trout growth.

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Section: Discussionsupporting

confidence: 91%

Use of Exercise and Structure during Rainbow Trout Rearing

Voorhees¹,

Huysman²,

Krebs³

et al. 2020

OJAppS

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“…It is possible that the higher velocity treatment used in this experiment was too high initially and too difficult for the fish to sustain over 116 days. [49]. However, feed conversion ratios in this study were lower than those reported in the only other study examining vertically-suspended structure and exercise [23].…”

Section: Discussioncontrasting

confidence: 81%

Influence of Water Velocity and Vertically-Suspended Structures on Rainbow Trout Rearing Performance

Voorhees¹,

Huysman²,

Krebs³

et al. 2020

OJAS

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This study evaluated the effects of two water velocities and three types of vertically-suspended environmental enrichment during the rearing of juvenile rainbow trout (Oncorhynchus mykiss; mean ± SE, initial weight 4 ± 1 g and total length 71 ± 2 mm) in 1.8-m diameter circular tanks. The 2 × 3 experimental design used two velocities (12.2 cm•s −1 and 30.5 cm•s −1) and three structural treatments (aluminum rod array, plastic spheres, or no structure). After 116 days, the fish reared without any structure (control) at 30.5 cm•s −1 had significantly lower total tank weight, gain, percent gain, feed conversion ratio, and specific growth rate compared to the other treatments. Similarly, the fish reared with a velocity of 30.5 cm•s −1 without structure were significantly shorter and lighter than those in the other treatments. There was no significant difference in condition factor and relative fin lengths among the treatments. These results indicate that vertically-suspended environmental enrichment may be impacting fish rearing performance by altering tank water velocities.

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“…Other investigations not using suspended structures have also reported changes in overall water velocities can influence trout growth[29] [30] [31] [32].As in previous studies utilizing vertically-suspended environmental enrichment, no negative effect on the self-cleaning nature of circular tanks was observed[19] [21][22]. As long as adequate incoming water flows are maintained, no extra maintenance or cleaning is needed with the small array of angles as used in this study.…”

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confidence: 90%

Vertically-Suspended Environmental Enrichment Improves Growth of Landlocked Fall Chinook Salmon during Initial Hatchery Rearing

Huysman¹,

Voorhees²,

Krebs³

et al. 2020

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Environmental enrichment has been shown to improve juvenile salmonid growth during hatchery rearing. This study examined the effects of vertically-suspended environmental enrichment starting seven days after feed training and continuing for the next 32 days of landlocked fall Chinook salmon (Oncorhynchus tshawytscha) rearing. At the end of this experiment, final tank weights, gain, percent gain, and feed conversion ratio were all significantly improved in the tanks of salmon with environmental enrichment compared to barren tanks, with a nearly 25% improvement in feed conversion ratio. Individual salmon in tanks with environmental enrichment were significantly longer and weighed significantly more than salmon from tanks without enrichment. Specific growth rate was also significantly improved with the use of enrichment. The use of vertically-suspended environmental enrichment to improve growth and rearing efficiency is recommended during the initial rearing of landlocked fall Chinook salmon.

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

Cited by 10 publications

References 17 publications

Use of Exercise and Structure during Rainbow Trout Rearing

Use of Exercise and Structure during Rainbow Trout Rearing

Influence of Water Velocity and Vertically-Suspended Structures on Rainbow Trout Rearing Performance

Vertically-Suspended Environmental Enrichment Improves Growth of Landlocked Fall Chinook Salmon during Initial Hatchery Rearing

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