Stocking density practices of commercial UK rainbow trout farms

North, Ben; Ellis, Tim; Turnbull, James; Davis, Jacob; Bromage, Niall

doi:10.1016/j.aquaculture.2006.05.043

Cited by 20 publications

(12 citation statements)

References 11 publications

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“…However, this negative effect has not been found by other authors in this (North et al, 2006;Di Marco et al, 2008) or in other fish species such as Arctic charr Salvelinus alpinus (Jørgensen et al, 1993) and European sea bass Dicentrarchus labrax (Lupatsch et al, 2010).…”

Section: Growthcontrasting

confidence: 50%

Interaction of dietary energy levels and culture density on growth performance and metabolic and oxidative status of rainbow trout ( Oncorhynchus mykiss )

Suárez

Trenzado

García‐Gallego

et al. 2015

Aquacultural Engineering

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Section: Growthcontrasting

confidence: 50%

Interaction of dietary energy levels and culture density on growth performance and metabolic and oxidative status of rainbow trout ( Oncorhynchus mykiss )

Suárez

Trenzado

García‐Gallego

et al. 2015

Aquacultural Engineering

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“…The results are, however, widely variable and not always conclusive. Therefore, interpreting the effect of stocking density on haematocrit is difficult; the haematocrit may have either elevated in T4 compared with the other treatments, possibly indicating an acute stress response (Barton and Iwama, 1991;North et al, 2006) or, alternatively, it may have reduced in T3 as opposed to T2, possibly suggesting anaemia (North et al, 2006). Previous studies have measured the effect of stocking density on haematocrit in rainbow trout (reviewed by Ellis et al, 2002) suggesting higher haematocrit levels in response to increased stocking density (Papst et al, 1992;Wagner et al, 1996).…”

Section: Discussionmentioning

confidence: 99%

“…Stocking density has been shown to affect behavioural interactions in several fish species (Brown et al, 1992;Christianssen et al, 1992;Irwin et al, 1999;Trenzado et al, 2006) and may ultimately affect growth rates. The effect of stocking density on growth has been reported for a range of cultured fish species such as gilthead seabream, Sparus aurata (Montero et al, 1999), juvenile turbot, Scophthalmus maximus (Irwin et al, 1999), rainbow trout Oncorhynchus mykiss (North et al, 2006), Japanese flounder, Paralichthys olivaceus (Sergio et al, 2006), rainbow trout Oncorhynchus mykiss (Trenzado et al, 2008), silver perch Bidyanus bidyanus (Rowland et al, 2006), halibut Hippoglossus hippoglossus (Bjørnsson, 1994), Arctic charr, Salvelinus alpinus (Jørgensen et al, 1993), rainbow trout Oncorhy-nchus mykiss (Zoccarato et al, 1992), and Atlantic salmon Salmo salar (Liu et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Effects of stocking density on growth performance, survival rate, and haematological parameters in rainbow trout (Oncorhynchus mykiss) fingerlings

2016

Res. Opin. Anim. Vet. Sci.

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The present study evaluated the effects of stocking density on growth performance, survival rate, and haematological parameters rainbow trout (Oncorhynchus mykiss) fingerlings. An experiment was conducted for 8 weeks with different stocking densities including T1: 10 kg/m . After 8 weeks, the juveniles were randomly sampled and analyzed for growth indices including weight gain, survival, specific growth rate (SGR), feed conversion rate (FCR), and condition factor (CF) as well as haematological parameters including haemoglobin (Hb), haematocrit (Hct), mean crepuscular haematocrit (MCH), mean crepuscular haematocrit concentration (MCHC), and red blood cells (RBC). Treatments with higher density showed lower growth rates (SGR and weight gain) compared to those of lower densities. Highest survival rate was observed in T2 and the lowest in T4. Based on the results, the stocking density significantly affected Hct, Hb, and RBC (P<0.05), while MCH and MCHC were not significantly affected (P<0.05). The present study demonstrated that there is a significant negative effect of increasing rearing density on juvenile rainbow trout. Further, it is suggested 15 kg/m 3 as an appropriate stocking density for rainbow trout fingerlings. Keywords: Stocking density; growth; haematological parameter; fish To cite this article: Eagderi S, M Rahimi, N Rostamian and SA Habibi, 2016. Effects of stocking density on growth performance, survival rate, and haematological parameters in rainbow trout (Oncorhynchus mykiss) fingerlings. Res. Opin. Anim. Vet. Sci., 6(4): 115-120.

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“…Therefore, it is possible that the reduction in efficiency and growth during this period may have become counteracted by increasing the feeding rate. Indeed, whereas the stocking density in the HD group reached an average of 55 kg/m 3 , stocking density practices on commercial trout farms can be successful varying from < 20 to > 80 kg/m 3 (North et al, 2003).…”

Section: Discussionmentioning

confidence: 99%

Feed efficiency of Rainbow trout (<i>Onchorynchus mykiss</i>) kept at high and low stocking density

Rauw¹,

Larrán²,

García-Cortés³

et al. 2017

International Journal of Recirculating Aquaculture

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A B S T R A C TFeed efficiency is a trait of high economic importance in fish production, and is highly related to feeding regimes employed and stocking density. However, feed efficiency is difficult to estimate because measurements of individual feed intake are generally not available in fish that are usually reared in groups in tanks. An alternative is to estimate feed efficiency using tank as the unit of measurement. The objective of this study was to investigate tank residual feed intake in rainbow trout kept at high (HD) and low (LD) stocking density during 42 days (Day 0-14 and Day 14-42) and the consequences of subsequently reducing density in the HD treatment between 42 and 78 days (Day 42-61 and Day 61-78). HD fish weighed less at all times than LD fish (P < 0.05). LD fish grew faster than HD fish (P < 0.05) but not between Day 42-61. The coefficient of variation of body weight was larger in HD fish than in LD fish (P < 0.05) at Day 14 and Day 42. LD fish ate more than HD fish between Day 14-78 (P < 0.01). HD fish were less food efficient than LD fish between Day 0-14 but more food efficient between Day 42-61. A higher coefficient of variation of body weight in the HD tanks suggests that growth and feed intake were inhibited because of dominance relationships at a high stocking density and possibly competition for food. After relocating HD fish to a low density treatment, HD fish showed compensatory growth and compensatory feed efficiency. Although it is not practical to estimate residual feed intake individually in fish, this research shows that calculation of tank residual feed intake can be used as an alternative, especially when used to compare families for family trait selection.

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Stocking density practices of commercial UK rainbow trout farms

Cited by 20 publications

References 11 publications

Interaction of dietary energy levels and culture density on growth performance and metabolic and oxidative status of rainbow trout ( Oncorhynchus mykiss )

Interaction of dietary energy levels and culture density on growth performance and metabolic and oxidative status of rainbow trout ( Oncorhynchus mykiss )

Effects of stocking density on growth performance, survival rate, and haematological parameters in rainbow trout (Oncorhynchus mykiss) fingerlings

Feed efficiency of Rainbow trout (<i>Onchorynchus mykiss</i>) kept at high and low stocking density

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