A note on the stomach contents of adult Atlantic salmon (Salmo salar, Linnaeus) from Port Burwell, Northwest Territories

1979 ◽  
Vol 57 (7) ◽  
pp. 1502-1503 ◽  
Author(s):  
John D. Neilson ◽  
David J. Gillis
Keyword(s):  
Atlantic Salmon ◽  
Northwest Territories ◽  
Salmo Salar ◽  
Stomach Content ◽  
Stomach Contents ◽  
Range Extension ◽  
Invertebrate Prey ◽  
Content Analyses ◽  
Important Fish ◽  
Prey Items

Stomach content analyses on 28 Atlantic salmon captured at Port Burwell, Northwest Territories, in late August, 1977, indicate that invertebrate prey items were the most important by volume. Parathemisto libellula dominated the invertebrate prey group, and Ammodytes sp. was the most important fish in the diet of the salmon analyzed. A range extension for Notoscopelus elongtus kroeyeri was recorded.

Feeding by Hatchery-Reared and Wild Atlantic Salmon (Salmo salar) Parr in Streams

1979 ◽  
Vol 36 (11) ◽  
pp. 1408-1412 ◽  
Author(s):  
A. J. Sosiak ◽  
R. G. Randall ◽  
J. A. McKenzie
Keyword(s):  
Atlantic Salmon ◽  
Key Words ◽  
Salmo Salar ◽  
Food Selection ◽  
Stomach Contents ◽  
Stomach Fullness ◽  
Size Dependent ◽  
Atlantic Salmon Salmo Salar ◽  
Feeding Experience ◽  
Salmon Parr

Hatchery-reared Atlantic salmon (Salmo salar) parr were captured 1–3 mo after release in streams, along with wild parr from the same streams. Identification of their stomach contents showed total number of organisms and number of taxa per stomach were greater and there was a higher index of stomach fullness in wild than in hatchery parr resident ≤ 2 mo in a stream. Wild parr consumed more Brachycentridae, Hydroptilidae, Diptera, and Plecoptera than did hatchery parr, but sometimes less Odontoceridae and Heptageniidae. These differences may have arisen from size-dependent food selection, the effects of feeding experience, or possible microhabitat differences between wild and hatchery parr. Key words: salmon parr, hatchery-reared, wild, feeding

scholarly journals Food Habits of the Endemic Long Legged Wood Frog, Rana Pseudodalmatina (Amphibia, Ranidae), in Northern Iran

2016 ◽  
Vol 50 (4) ◽  
pp. 363-368
Author(s):  
M. Najibzadeh ◽  
A. Gharzi ◽  
N. Rastegar-Pouyani ◽  
E. Rastegar-Pouyani ◽  
A. Pesarakloo
Keyword(s):  
Stomach Content ◽  
Food Habits ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Food Habit ◽  
Wood Frog ◽  
Hyrcanian Forest ◽  
Northern Iran ◽  
Frog Species ◽  
Prey Items

Abstract Iranian long legged wood frog, Rana pseudodalmatina Eiselt & Schmidtler, 1971 is a brown frog species endemic to the Hyrcanian forest. The objective of the present study is to collect detailed information on the feeding habits of 44 specimens of this species (24 ♂, 20 ♀) by analyzing the stomach contents of individuals from 10 populations inhabiting range. The food habit of R. pseudodalmatina generally varies by the availability of surrounding prey items, and it is a foraging predator, the food of which consists largely of Coleoptera (mainly Carabidae, Dytiscidae and Haliplidae), Diptera (Muscidae) and Hymenoptera (Formicidae), and no difference was found between females and males in the stomach content.

Feeding Response of Atlantic Salmon (Salmo salar) Alevins in Flowing and Still Water

1978 ◽  
Vol 35 (3) ◽  
pp. 329-332 ◽  
Author(s):  
D. M. Rimmer ◽  
G. Power
Keyword(s):  
Atlantic Salmon ◽  
Food Consumption ◽  
Salmo Salar ◽  
Water Current ◽  
Feeding Response ◽  
Atlantic Salmon Salmo Salar ◽  
Total Food ◽  
Prey Items ◽  
Total Food Consumption

Atlantic salmon (Salmo salar) alevins presented with lake zooplankton in still water readily consumed prey items, but only if the prey were nearby and moving. Feeding was initiated from the bottom or from midwater, but no search or pursuit behavior was noted. Stomach analyses of alevins exposed to lake zooplankton assemblages for 3 h in still and flowing (7.2 cm∙s−1) water revealed that the two groups consumed similar diets, but that the still-water group had a greater total food consumption. We conclude that for alevins to feed successfully, food need not be carried in a water current, but that motion of the prey is necessary. This motion can be provided by water current or by the prey. The role of prey motility in the feeding of young salmonids is briefly discussed. Key words: Atlantic salmon, alevins, feeding, water current

Stomach Contents of New Zealand Inland Shags

1951 ◽  
Vol 2 (2) ◽  
pp. 245 ◽  
Author(s):  
P Dickinson
Keyword(s):  
New Zealand ◽  
Stomach Content ◽  
Stomach Contents ◽  
The State ◽  
Salmonid Fish ◽  
Freshwater Crayfish ◽  
Important Food ◽  
Phalacrocorax Carbo ◽  
Content Analyses ◽  
Food Fish

Twenty-nine stomachs of the large black shag (Phalacrocorax carbo (Linn.)) and 61 of the white-throated or little pied shag (P. brevirostris (Gould)) from the Rotorua-Taupo area were examined. Techniques used to determine the state of digestion and the identification of otoliths are discussed. Stomach content analyses showed that the food of lake-feeding shags in July consisted almost entirely of fish and freshwater crayfish. Bullies (Gobiomorphus sp.) were the most important food fish. Salmonid fish were found in one stomach (P. carbo).

Rubber net mesh reduces scale loss during routine handling of farmed Atlantic salmon (Salmo salar)

2021 ◽  
Vol 30 (1) ◽  
pp. 19-24
Author(s):  
A Powell
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Fish Species ◽  
Mesh Size ◽  
Controlled Environment ◽  
Farmed Atlantic Salmon ◽  
Routine Handling ◽  
Large Adult ◽  
Reduced Scale ◽  
Important Fish

Atlantic salmon (Salmo salar) are an economically and ecologically important fish species that interact with humans during farming, fishing and research operations. Routine handling in nets exposes fish to mesh and causes scale loss. To promote welfare and experimental refinement, a study was performed in a controlled environment to investigate the effect of net mesh type (rubber-coated or standard knotless, both bag volumes circa 7 l; mesh size: 6 mm) and the number of fish per net (capture density) on scale loss. Up to three large adult salmon (mean weight: 900 g) or 15 small smolts (mean weight: 145 g) were briefly captured in hand-nets during routine immersed-stock movement between tanks. Scales were recovered and counted from transportation containers, to establish a simple and rapid methodology. For both size grades, scale loss was generally proportional to capture density. For large adult salmon, scale loss significantly increased with capture density when knotless mesh was used, however the increase was less marked and not statistically significant for adults handled in rubber mesh. Small smolts also demonstrated significantly reduced scale loss when handled with rubber mesh, which increased gradually with capture density. In contrast, small smolts handled in knotless mesh showed greater scale loss as capture density increased. An overall reduction in scale loss with increased capture density was not shown, although the biomass loading per net used in this study were intentionally low (<3.5 kg). This method suggests a low-tech and rapid approach to quantitatively compare net types and husbandry techniques and suggests a fundamental but simple improvement to salmonid handling in recreational and commercial operations. However, any correlation to conventional stress assays or behavioural observations remains to be established.

scholarly journals Allometry of diet selectivity in juvenile Atlantic salmon (Salmo salar)

1997 ◽  
Vol 54 (8) ◽  
pp. 1894-1902 ◽  
Author(s):  
E R Keeley ◽  
JWA Grant
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Fork Length ◽  
Stomach Contents ◽  
Optimal Size ◽  
Atlantic Salmon Salmo Salar ◽  
Paired Samples ◽  
Selective Foraging ◽  
Juvenile Atlantic Salmon ◽  
Prey Length

Juvenile salmonids in streams typically feed on larger invertebrates than the average size available in the drift. Our objective was to describe the allometry of this size-selective foraging in juvenile Atlantic salmon, Salmo salar of Catamaran Brook, New Brunswick. We compared paired samples of the stomach contents of 46 salmon (age 0 + to 2 + ; fork length 2.9-14.5 cm) with drift samples collected from their feeding territories. Juvenile salmon fed opportunistically on all major types of invertebrates in the drift, except for water mites (Hydracarina). However, newly emerged salmon fed on smaller prey than the average available in the drift, primarily chironomid larvae, whereas salmon larger than 4.6 cm fed on larger prey than average, primarily dipteran adults and pupae. Larger salmon ate larger prey. Minimum prey length in stomachs was well predicted by gill raker spacing, but mean prey width was only one third of the optimal size and maximum prey width was much less than mouth width. The allometry of prey size appeared to be related primarily to an increase in size-selective foraging with increasing body size, rather than to morphological constraints. Juvenile Atlantic salmon in our study ate smaller prey than similar-sized salmonids in other studies.

Feeding of Atlantic salmon (Salmo salar L.) postsmolts in a fjord in central Norway

1994 ◽  
Vol 72 (5) ◽  
pp. 834-839 ◽  
Author(s):  
C. D. Levings ◽  
N. A. Hvidsten ◽  
B. Ø. Johnsen
Keyword(s):  
Atlantic Salmon ◽  
Salmo Salar ◽  
Larval Fish ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Calanoid Copepods ◽  
Atlantic Salmon Salmo Salar

The feeding habits of postsmolt Atlantic salmon (Salmo salar) caught by two-boat trawling were studied in Trondheimsfjord in central Norway. Fish caught in the inner fjord near the estuaries of the Orkla and Gaula rivers had recently fed on food produced in freshwater and estuarine habitats, namely stonefly and mayfly nymphs and gammarid amphipods. Stomach contents of postsmolts caught farther seaward were dominated by adult insects, with smaller proportions of the food volume originating from marine pelagic (larval fish, hyperiid amphipods, calanoid copepods) and nearshore (gammarid amphipods) habitats.

Diel Feeding Chronology and Diet Selection of Rainbow Trout (Oncorhynchus mykiss) in the Henry's Fork of the Snake River, Idaho

1990 ◽  
Vol 47 (1) ◽  
pp. 199-209 ◽  
Author(s):  
T. R. Angradi ◽  
J. S. Griffith
Keyword(s):  
Rainbow Trout ◽  
Oncorhynchus Mykiss ◽  
Stomach Content ◽  
Decision Rules ◽  
Stomach Contents ◽  
Live Weight ◽  
Invertebrate Drift ◽  
Rainbow Trout Oncorhynchus Mykiss ◽  
Terrestrial Insects ◽  
Prey Items

Concurrent rainbow trout (Oncorhynchus mykiss) stomach contents and invertebrate drift samples were collected during three 24-h periods in summer 1987. Feeding was discontinuous through the day on all dates. Mean stomach content weight was minimal after 0400 MST and sharply increased between 1000 and 1200 MST on all three dates. Feeding apparently did not occur after twilight. Mean stomach content weight was correlated with water temperature on two dates and was never correlated with invertebrate drift density for non-age-0 trout. Daily ration (wet weight) was 7% of live weight for non-age-0 trout and 21% for age-0 trout. Trichoptera, Ephemeroptera, and Diptera were most important in the diet; terrestrial insects and aquatic vertebrates were rare. The degree of selectivity varied through 24 h and the interpretation depended on the method of analysis used. Occurrence of low-drift cased Trichoptera larvae in stomachs was correlated with amount of filamentous algae ingested, indicating a degree of epibenthic foraging, although no diel pattern could be reliably discerned. Mean length of prey items in stomachs was larger that the drift in 83% of the samples. Our findings support experimentally derived decision rules-of-thumb for foraging trout: select larger prey items, select vulnerable prey, and relax selectivity when hungry.

L'alimentation estivale du campagnol des champs, Microtus pennsylvanicus, Ord.

1979 ◽  
Vol 57 (10) ◽  
pp. 2028-2032 ◽  
Author(s):  
Jean-Marie Bergeron ◽  
Jacques Juillet
Keyword(s):  
Stomach Content ◽  
Feeding Habits ◽  
Stomach Contents ◽  
Microtus Pennsylvanicus ◽  
Meadow Voles ◽  
Animal Feeds ◽  
Content Analyses ◽  
Common Plant

Stomach content analyses performed on 272 meadow voles (Microtus pennsylvanicus) revealed that the animal feeds on 35 of the 45 species of plant present in its habitat. Timothy is the most abundant and the most common plant in the vole's diet. The abundance of the plants sampled in the habitat is positively correlated with the abundance of the plants found in the stomach contents. However, some species, like meadow grass (Poa spp.), aredefinitely preferred by the voles since they appear more frequently in the stomach contents than in the habitat. Some feeding habits are also sex dependent.[Translated by the journal]

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