Variation in food intake within groups of juvenile perch

Staffan, Fia

doi:10.1006/jfbi.2002.1882

Cited by 6 publications

(7 citation statements)

References 14 publications

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“…In the aquarium experiments, there was a variation in food intake of perch competing in small groups, as has been found earlier (Staffan et al ., 2002; Westerberg et al ., 2004). A consistency in individual feeding success, compared to the same individuals, in several aquarium experiments separated in time has, however, not been found in perch previously.…”

Section: Discussionsupporting

confidence: 70%

Individual feeding success of juvenile perch is consistent over time in aquaria and under farming conditions

Staffan¹,

Magnhagen²,

Alanärä³

2005

Journal of Fish Biology

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Juvenile (0+ year) perch Perca fluviatilis, held in tanks (1 m3) for 8 months under constant temperature (17° C) and light (12L : 12D) conditions, were weighed monthly. Individually marked fish from the tanks were placed in aquaria in groups of four and tested for feeding success, assessed as individual share of a group meal in three identical short‐term aquarium experiments separated in time (January, May and June). The groups consisted of the same individuals in each of the three experiments. In tanks, growth (thermal growth coefficient, GT) was used as a measurement of feeding success. Individual GT in tanks was consistent over time, and individual share of a group meal in aquaria was consistent between consecutive months. There was no connection between individual feeding success in aquaria and GT in tanks in May and June, and in January the factors were negatively correlated. The condition factor at the start of aquarium experiments and feeding success in aquaria were negatively correlated in June and tended to be so also in May. Boldness in aquaria was negatively correlated with growth in tanks. Thus, individuals that were successful in one environment seemed to be less successful in the other. There was a seasonal change in GT, with an increase from March to April and from April to June despite constant day length and temperature.

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Section: Discussionsupporting

confidence: 70%

Individual feeding success of juvenile perch is consistent over time in aquaria and under farming conditions

Staffan¹,

Magnhagen²,

Alanärä³

2005

Journal of Fish Biology

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“…Dominance hierarchies in small groups of fishes are often established through aggressive behaviour of dominant individuals towards subordinate individuals [51,52]. Aggressive behaviour in small groups of perch has been observed in a few cases [53] but often no aggression can be observed [54]. Whether aggressive behaviour leads to dominance hierarchies in perch is unclear.…”

Section: Body Size Datamentioning

confidence: 99%

Growth and Energy Expenditures of Eurasian Perch Perca fluviatilis (Linnaeus) in Different Temperatures and of Different Body Sizes

Strand¹,

Magnhagen²,

Alanärä³

2011

J Aquac Res Development

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“…1993; Sneddon 2003). Different levels of boldness in perch have been found for different populations (Magnhagen 2006), for different size classes within one age class of a population (Borcherding 2006) and even on an individual basis within a social group (Staffan et al. 2002; Magnhagen & Staffan 2003, 2005).…”

Section: Introductionmentioning

confidence: 99%

Food abundance affects both morphology and behaviour of juvenile perch

Borcherding

Magnhagen

2007

Ecology of Freshwater Fish

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– Behaviour and morphology were both shown to differ between 1+ perch from two lakes that in earlier studies showed differences in size‐specific predation risk. As the level of nourishment is known to affect behaviour and morphology, we fed perch of the two lakes in tanks for 40 days with two food levels, to study whether observed differences remain stable with changes in food availability. The perch fed in excess grew significantly, while the perch at the low food conditions lost weight, clearly indicating undernourishment. In aquarium experiments, the starved perch from both lakes were much bolder in the trade‐off between foraging and predator avoidance than their well‐fed conspecifics. In addition, the shape of perch differed significantly between feeding treatments. At low food levels perch got a more slender body, while at high food levels they developed a deeper body and a relatively smaller head. Independent of feeding level, the comparison between the two lakes revealed a clearly deeper body and a larger head area for one population, a shape difference that remained stable after the feeding period. The results give evidence that the level of nourishment is an important factor that quickly alters risk‐taking behaviour. In body morphology, however, more stable shape characteristics must be distinguished from more flexible ones. Consequently, the level of nourishment is a potential factor that may quickly hide other proximate cues and must be considered attentively in studies, in which shape changes and behaviour are related to environmental factors like diet, predation pressure or habitat diversity.

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Variation in food intake within groups of juvenile perch

Cited by 6 publications

References 14 publications

Individual feeding success of juvenile perch is consistent over time in aquaria and under farming conditions

Individual feeding success of juvenile perch is consistent over time in aquaria and under farming conditions

Growth and Energy Expenditures of Eurasian Perch Perca fluviatilis (Linnaeus) in Different Temperatures and of Different Body Sizes

Food abundance affects both morphology and behaviour of juvenile perch

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