Feeding by Arizona trout (Salmo apache) and brown trout (Salmo trutta) at different light intensities

Robinson, Fredric W.; Tash, Jerry C.

doi:10.1007/bf00005525

Cited by 38 publications

(26 citation statements)

References 24 publications

(17 reference statements)

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“…Most stream salmonids are visual foragers, preying primarily upon drifting invertebrates while maintaining focal points in the water column (Angradi and Grith 1990;see Kitano et al 1993 for rainbow trout in the Horonai Stream). In such drift foragers, the foraging eciency generally decreases with lower light intensity (Robinson and Tash 1979). Thus, the above``risk-of-predation hypothesis'' can at least partly explain the nocturnal periodicity of may¯y drift in the Horonai Stream.…”

Section: Discussionmentioning

confidence: 98%

Effects of drift- and benthic-foraging fish on the drift dispersal of three species of mayfly nymphs in a Japanese stream

Miyasaka

Nakano

1999

Oecologia

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Differences in the effects of two common predatory fishes, rainbow trout (Oncorhynchus mykiss) and freshwater sculpin (Cottus nozawae), on drift dispersal of the nymphs of three mayfly species, Baetis thermicus, Cinygmula sp., and Paraleptophlebia chocorata, were examined by manipulative field experiments using stream enclosures in a northern Japanese stream. The diel periodicity of prey consumption rate differed considerably between the two fishes; the prey consumption of the drift-foraging trout was greater at both dawn and dusk, whereas the benthic-foraging sculpin showed a higher consumption rate at night. The drift propensity at night was much greater than during the day for all the mayfly species in each of the trout, sculpin and fishless treatments, as well as under natural conditions with both fishes present. The nighttime drift propensities of the epibenthic grazers, B. thermicus and Cinygmula sp., were greater in the sculpin treatment than in trout and fishless treatments, and they did not differ between the trout and fishless treatments. By contrast, the nighttime drift propensity of P. chocorata, an infaunal collector-gatherer, did not differ among the treatments. The daytime drift propensity did not differ among the treatments for any of the mayfly species. Thus differences in drift response to the predatory fishes could be related to the characteristic microhabitats of the mayfly species. Moreover, the experiments demonstrated that benthic-foraging sculpin had greater overall effects on prey drift than drift-foraging trout.

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Section: Discussionmentioning

confidence: 98%

Effects of drift- and benthic-foraging fish on the drift dispersal of three species of mayfly nymphs in a Japanese stream

Miyasaka

Nakano

1999

Oecologia

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“…Salmonids detect prey visually and so are unable to feed at light levels below which they cannot see (Robinson & Tash 1979, Tanaka 1970) . One reason for variation in the rate of feeding at night may, therefore, be the amount of light available, as determined by the moon phase and weather .…”

Section: Discussionmentioning

confidence: 99%

“…One important aspect of the feeding behaviour of salmonids which has received limited attention is changes in feeding and prey selection over the diel cycle . Feeding might be expected to differ between day and night because salmonids feed visually (Robinson & Tash 1979, Tanaka 1970, and so should feed less efficiently, and perhaps also less selectively, after dark . In addition, there are marked diel changes in the availability of their prey.…”

Section: Introductionmentioning

confidence: 99%

Diel and density-related changes in food consumption and prey selection by brook charr in a New Hampshire stream

1994

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SynopsisWe report the results of a field study testing influences of both density and changes over the diel cycle on food consumption and prey selection by brook charr, Salvelinus fontinalis. Charr density in replicate 35 m long sections of a New Hampshire stream was adjusted to either medium or high levels (relative to natural densities) . Diets of charr and the availability of drifting prey were then sampled every four hours for 24 hours .There were no significant diel changes in the weight of prey consumed by charr per four hours, though there was some indication of reduced feeding at night . Charr fed selectively on different prey taxa, showing most preference for cased caddis larvae . Several species of mayflies and stoneflies were selected more strongly during the day than at night . Charr fed selectively on larger prey during the daytime but showed no sizeselection at night . The density of charr had no significant effects on either their rate of food consumption or on selection for prey of different taxa or sizes .

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“…L'aptitude à capturer des proies la nuit est connue chez la truite (ROBINSON et TASH, 1979). Un partage temporel des postes d'alimentation serait également possible entre les congénères, certains individus accédant à un poste d'alimentation favorable la nuit uniquement (ROUSSEL, 1998).…”

Section: Discussionunclassified

Habitat De La Truite Commune (Salmo Trutta L.) Pendant La Période Juvénile en Ruisseau : Préférences, Mouvements, Variations Journalières Et Saisonnières.

Roussel¹,

Bardonnet

2002

Bull. Fr. Pêche Piscic.

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RÉSUMÉCet article synthétise les résultats de travaux récents sur l'habitat de la truite commune pendant sa période juvénile en ruisseau. Par des approches in situ (affluents du Scorff, Bretagne) et en milieu expérimental, les variations temporelles d'utilisation de l'habitat ont été étudiées, ainsi que l'influence de certains facteurs abiotiques (vitesse de courant, profondeur, granulométrie, abris) et biotiques (prédation, compétition intraspécifique) sur les choix d'habitat de l'individu. A l'aide de la bibliographie sur le sujet, nous proposons un bilan des changements journaliers et saisonniers d'habitat du juvénile en ruisseau, depuis l'émergence jusqu'à la première reproduction. En matière de protection des milieux, l'accent est mis sur l'importance de la diversité des habitats disponibles dans les affluents où se reproduit l'espèce.Mots-clés : truite, Salmo trutta, juvénile, ontogenèse, comportement, rythmes journaliers, habitat, mouvement. THE HABITAT OF JUVENILE BROWN TROUT (SALMO TRUTTA L.) IN SMALL STREAMS: PREFERENCES, MOVEMENTS, DIEL AND SEASONAL VARIATIONS. ABSTRACTThis paper summarizes our recent investigations on habitat requirements for juvenile brown trout (Salmo trutta) in small tributaries of a lowland river system, the Scorff River (Brittany, France). Preferences for water velocity, depth, substrate and shelter, temporal variations in habitat use, and effects of predation and intra-specific competition on habitat choice, were studied both at field and laboratory. Using results from the literature, we propose a synthesis of the diel and seasonal shifts in habitat use by juvenile brown trout, Bull. Fr. Pêche Piscic. (2002)

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Feeding by Arizona trout (Salmo apache) and brown trout (Salmo trutta) at different light intensities

Cited by 38 publications

References 24 publications

Effects of drift- and benthic-foraging fish on the drift dispersal of three species of mayfly nymphs in a Japanese stream

Effects of drift- and benthic-foraging fish on the drift dispersal of three species of mayfly nymphs in a Japanese stream

Diel and density-related changes in food consumption and prey selection by brook charr in a New Hampshire stream

Habitat De La Truite Commune (Salmo Trutta L.) Pendant La Période Juvénile en Ruisseau : Préférences, Mouvements, Variations Journalières Et Saisonnières.

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