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Showing 1 to 20 of 79 for “"stomach contents"”.
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Comparative dietary analysis of four small pelagic fish species from presumed mixed shoals off South Africa's east coast
Stomach contents of sardine (Sardinops sagax), anchovy (Engraulis encrasicolus), west coast redeye (Etrameus whiteheadi) and east coast redeye (E. teres) were collected from presumed mixed shoals off South Africa's east coast. The stomach contents were analysed to 1) determine the diet composition …
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Food Habits, Distribution and Impact of the Nine-Banded Armadillo in Missouri
Stomach analyses were done on forty-five armadillos taken in twelve southern Missouri counties. Coleoptera larvae and adults comprised 26.1-32.4% of the stomach contents by weight and 26.5-32.4% by volume for the fall, winter and spring seasons. Ants (Hymenoptera) made up 29.3% of the stomach …
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Diet, growth and bioenergetics of Northern Pike (Esox lucius Linnaeus, 1758) in Box Canyon Reservoir, Pend Oreille River, Washington
… All northern pike were sacrificed to obtain stomach contents. Stomach contents were examined in the laboratory and identified to the appropriate level; amphibians and mammals to species, insect prey (aquatic/terrestrial) to family and prey fish to species. Using standard regression equations …
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Breeding Jackass Penguins as pelagic predators
… accordingly. Penguins do not regurgitate their stomach contents when handled, so I constructed a wet-offloading stomach pump which extracted 100% of the stomach contents. Using this pump, I determined that the rate of digestion of fish and squid by Jackass Penguins differed. Care is needed in …
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Diet and trophic relationships of fishes from the nearshore of the Bay of Quinte and Kingston Basin, Lake Ontario
… two habitats. Stable isotopes indicated that stomach contents over-estimated the contribution of mollusc-prey to the diet of Round Goby and under-estimated the contribution of soft-bodied prey. In Chapter 3, I investigated differences in food web structure in these two habitats, and observed a …
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Biology and ecology of four catshark species in the southwestern Cape, South Africa
… and forty-one specimens were examined via stomach contents. Prey were sorted and identified to the lowest possible taxon. An Index of Relative Importance (IRI = %F(%N + % V) was used to determine the importance of prey items in the catsharks' diets.
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DIET ANALYSIS OF NATIVE AND NON-NATIVE JUVENILE SALMONIDS IN A LAKE SUPERIOR TRIBUTARY
… measures of potential competitive interactions. Stomach contents and drift were analyzed for seven months in three habitat areas of the study stream. Stomach contents were obtained from 643 fish and yielded 6245 prey items, the majority (76.3%) of which were aquatic. Diet overlap analysis …
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Analysis of a Blue Catfish Population in a Southeastern Reservoir: Lake Norman, North Carolina
… Chara were the predominant food items (percent stomach contents by weight) found in blue catfish, and varied by season, lake-region, and fish size-class. Lake Norman blue catfish grow at a slower rate than has been reported for other reservoir populations, with fair to poor body conditions …
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A multi-indicator approach to dietary assessments within Lake Michigan's nearshore area
… assessment methods of examining individual’s stomach contents provide valuable data quantifying relationships, however what is incorporated into organisms is not always proportional to what is consumed. Biochemical compounds have recently been explored in marine and terrestrial systems to …
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Egg cannibalism by anchovy in the Southern Benguela Current Region
… length), weighed (total and ovary mass) and de-stomached. Weight of the stomach contents were determined and anchovy eggs in the stomach were counted. Anchovy eggs in CalVET net samples were counted and staged. Frequency distributions of densities of eggs in the plankton on the Agulhas Bank and …
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Food habits of nutria (Myocastor coypus) at Spring Lake, Hays County, Texas
… 1998 to 2000 using microhistological analysis of stomach contents. Forty-four nutria were collected during the year. Vegetation surveys were conducted at Spring Lake using the Daubenmire technique to estimate aquatic macrophyte cover. The availability of aquatic macrophytes at Spring Lake was …
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Feeding habits of the yellowtail flounder and production of its invertebrate prey on Georges Bank
… Fisheries Center sampled yellowtail flounder stomachs at three sites on four quarterly dates from August 1982 to May 1983. As closely as possible, stomach sampling coincided with the dates and locations of benthic monitoring to enable direct comparison between ingested and available food. …
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The Response of a Predatory Fish, Ophiodon elongatus, to a Marine Protected Area: Variation in Diet, Catch Rates, and Size Composition
… I measured, weighed, sexed, and collected stomach contents from Lingcod using the gastric lavage (stomach pumping) technique. Then, I identified prey items from Lingcod stomach contents down to the lowest taxonomic level possible and quantified diet composition by percent by occurrence, …
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The food and feeding of Etrumeus whiteheadi Wongratana 1983, off the Cape Province of South Africa
… November 1983 and 1984. Diet was determined from stomach contents. Dry mass and numbers of food items are presented. Copepods were the principal food off the south coast, constituting a mean of 67% (range: 60-75%) by mass of gut contents in juveniles, a mean of 59% (range 44-88%) in the …
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Food Habits of Snakes in an East Texas State Fish Hatchery
… A total of 373 snakes were captured. Results of stomach contents analyses of the 206 snakes containing food were calculated in per cent frequency of occurrence and per cent volume. Frogs, primarily Ranidae, were found to be the major food item. Fish were taken far less frequently, representing …
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Passerine Exposure to Metal Contaminants from Oilsands Mining in the Athabasca Region of Northeastern Alberta, Canada
… metal concentrations in kidney, liver, and stomach contents of nestling tree swallows, and monitored tree swallow nest success and nestling growth. I identified insects fed to nestlings to understand the influence of diet on metal accumulation in tissues, and collected insects to assess …
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Effects of landlocked alewife introduction on white bass and walleye populations, Claytor Lake, Virginia
… length intervals. Alewives were found in the stomach contents of eight species of piscivorous fishes. The vertical distributions by season of alewives, channel catfish, white crappie, walleye, and white bass are given. Each of the predator fishes seem to be found in close proximity to the …
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Vertical Resource Partitioning and Sexuality of Three Sympatric Species of Red Sea Sandfishes (Xyrichtys melanopus, Labridae; Trichonotus nikii, Trichonotidae; Gorgasia sp., Congridae)
… times a day. These samples were compared to stomach contents of the fishes to determine the trophic relationships in the community and their affects on spatial relations between the species . Prey specificities of the fishes were determined by using an electivity measure. Using paraffin …
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Ecology of the migration and distribution of the anchovy Engraulis capensis off Namibia
… obtained from the commercial fishery statistics. Stomach contents extracted from samples of anchovy shoals were compared to water samples from their environment. Data on diet obtained from the fishery catch statistics are analysed to indicate feeding trends.
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Alimentação, ciclo reprodutivo e associação de Loligo sanpaulensis Brakoniecki, 1984 (Cephalopoda: Loliginidae) com a ictiofauna demersal na plataforma costeira do Cabo Frio, RJ
… were recorded from 1594 specimens. The degree of stomach and digestive caecum fulness were examinated on 859 specimens and 351 squids had their stomach contents analysed. Loligo sanpaulensis occurred over the shelf in all seasons, with a mean catch of 39.2 ind/hour trawling. Best yields were …
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