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

Parker, Timothy M.; Barnes, Michael E.

doi:10.1080/00028487.2015.1047533

Cited by 27 publications

(29 citation statements)

References 48 publications

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“…The relatively low SSI values reported in this study, compared with those in Barnes et al. () and Parker and Barnes (), are surprising because fish in all of the tanks showed symptoms of bacterial coldwater disease (Neiger et al. ), and the causative agent of the disease, Flavobacterium psychrophilum , was isolated.…”

Section: Discussioncontrasting

confidence: 67%

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An Evaluation of Vertically Suspended Environmental Enrichment Structures during Rainbow Trout Rearing

2018

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Environmental enrichment is the addition of substrate or structural complexity to typically sterile culture environments, but the effects of enrichment on fish rearing performance are relatively unknown. This 127‐d study examined the growth and condition of juvenile Rainbow Trout Oncorhynchus mykiss reared in near‐fully covered circular tanks (1.8 m diameter) with three novel environmental treatments: (1) eight vertically suspended nylon strings with seven colored (6.4 cm diameter) plastic spheres (high density), (2) five vertically suspended strings with seven colored plastic spheres (low density), and (3) a mixture of five vertically suspended colored plastic spheres and nine vertically suspended aluminum rods. Near‐fully covered tanks without enrichment were used as a control. Weight gain, feed conversion ratio, individual fish length, and fish weight were significantly improved in environmentally enriched tanks compared with those features in the unenriched control. Among all of the treatments, the tanks of fish with high‐density spheres had significantly higher ending tank weights (i.e., total weight of fish in tank) and weight gain, both of which were nearly 65% and 75% greater, respectively, than in the control tanks. However, high density spheres also interfered with the self‐cleaning nature of the circular tanks. No significant differences in splenosomatic indices, viscerosomatic indices, hepatosomatic indices, and relative fin lengths were observed among the three enrichment treatments. Based on the results of this study, the use of either low‐density spheres or a mix of rods and spheres is recommended during the rearing of juvenile Rainbow Trout in circular tanks.

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Section: Discussioncontrasting

confidence: 67%

“…In addition, changes in overall water velocities can influence trout growth (Leon ; Kiessling et al. ; Parker and Barnes , ).…”

Section: Discussionmentioning

confidence: 99%

An Evaluation of Vertically Suspended Environmental Enrichment Structures during Rainbow Trout Rearing

2018

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“…Leon (1986) also observed similar growth decreases and feed conversion increases in Brook Trout Salvelinus fontinalis reared at higher velocities. However, Parker and Barnes (2015) noted no effects on Rainbow Trout grown at velocities up to 3.0 BL/s. A possible explanation for this discrepancy could be that the Rainbow Trout used in the current study were nearly three times heavier and 30 mm larger than those used by Parker and Barnes (2015).…”

Section: Discussionmentioning

confidence: 82%

“…However, Parker and Barnes (2015) noted no effects on Rainbow Trout grown at velocities up to 3.0 BL/s. A possible explanation for this discrepancy could be that the Rainbow Trout used in the current study were nearly three times heavier and 30 mm larger than those used by Parker and Barnes (2015).…”

Section: Discussionmentioning

confidence: 82%

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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“…), as well as the energetic costs of food acquisition (Ogata and Oku ; Merino et al. ; Parker and Barnes ) and predator avoidance (Connell ; Brönmark et al. ).…”

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confidence: 99%

Extrinsic Factors Influencing Somatic Growth of Lake Sturgeon

McDougall¹,

Nelson²,

Barth³

2018

Trans Am Fish Soc

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Variation in somatic growth of Lake Sturgeon Acipenser fulvescens has primarily been attributed to temperature (latitude), but recent studies have suggested additional complexities. Based on populations in Manitoba, Canada, a multivariate analysis was conducted to reevaluate the extrinsic factors influencing growth of Lake Sturgeon. Length at ages 3, 6, 9, and 12 and the following six explanatory variables were examined: latitude, mean annual air temperature, pH, conductivity, juvenile Lake Sturgeon density (gill‐net CPUE), and water velocity. Length‐at‐age variables were highly correlated, but considerable variation for fish of a given age was observed along the flow axes of individual rivers (and even within multibasin reservoirs). For example, fork length at age 12 ranged from 520 to 906 mm. After dropping latitude due to colinearity with both temperature and pH, a redundancy analysis based on the remaining five explanatory variables explained 79.9% of the variation in the four length‐at‐age variables. Lake Sturgeon growth was negatively correlated with both CPUE (41.2% of variation) and velocity (19.2%) and positively correlated with conductivity (14.8%). The temperature and pH variables lacked statistical significance for inclusion in a forward‐selection model, regardless of which other variables were included. Our results suggest that the influence of temperature (latitude) on Lake Sturgeon growth may previously have been overstated because habitat variation was not accounted for. Indeed, because populations exploit a diversity of river types across the species range, the discussion of growth needs to be placed in the context of habitat. Individuals from two Lake Sturgeon populations occupying similar latitudes can exhibit markedly different rates of somatic growth, with much of the variation being explained by juvenile density, water velocity, and conductivity. As Lake Sturgeon recovery proceeds, fisheries managers will need to contend with dynamic growth trajectory responses to increasing abundance, much as they would for other species.

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

Cited by 27 publications

References 48 publications

An Evaluation of Vertically Suspended Environmental Enrichment Structures during Rainbow Trout Rearing

An Evaluation of Vertically Suspended Environmental Enrichment Structures during Rainbow Trout Rearing

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

Extrinsic Factors Influencing Somatic Growth of Lake Sturgeon

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