scholarly journals Feeding studies take guts – critical review and recommendations of methods for stomach contents analysis in fish

2019 ◽  
Vol 95 (6) ◽  
pp. 1364-1373 ◽  
Author(s):  
Per‐Arne Amundsen ◽  
Javier Sánchez‐Hernández
Keyword(s):  
Critical Review ◽  
Stomach Contents ◽  
Stomach Contents Analysis

A critical review of methods of studying fish feeding based on analysis of stomach contents: application to elasmobranch fishes

1997 ◽  
Vol 54 (3) ◽  
pp. 726-738 ◽  
Author(s):  
E Cortés
Keyword(s):  
Stomach Content ◽  
Critical Review ◽  
Graphical Representation ◽  
Statistical Tests ◽  
Rank Correlation ◽  
Stomach Contents ◽  
Real Data ◽  
Daily Ration ◽  
Fish Feeding ◽  
Elasmobranch Fishes

Using real data sets of elasmobranch fishes as examples, this paper presents a critical review of selected methods and statistical approaches used in fish feeding studies and makes recommendations on the application of such methodology. The percent index of relative importance is proposed as a standardized measure in dietary analyses, and a three-dimensional graphical representation of the diet is introduced. Multiway contingency table (log-linear) analysis is recommended to test for dietary variations. Caution is advised when using rank correlation to study dietary overlap and parametric tests when stomach content data do not satisfy parametric assumptions. Sampling gear type, experimental design, and statistical tests can affect results on diel feeding chronology, and stomach content weights do not suffice to interpret diel feeding chronology. On the basis of sampling requirements and model assumptions, the Diana and Olson-Mullen methods appear to be the most appropriate approaches for estimating daily ration in sharks. Use of resampling techniques is highly desirable because they provide a measure of the error in daily ration estimates. Using several criteria to evaluate the best-fitting model of gastric evacuation in fishes is also strongly advocated. Overall, increased consolidation of methods and analyses is recommended to facilitate comparative studies.

scholarly journals Notes on the diet of adult Yellow Catfish Aspistor luniscutis (Pisces: Siluriformes) in northern Rio de Janeiro State, southeastern Brazil

2019 ◽  
Vol 11 (7) ◽  
pp. 13920-13924 ◽  
Author(s):  
Ana Paula Madeira Di Beneditto ◽  
Maria Thereza Manhães Tavares
Keyword(s):  
Rio De Janeiro ◽  
Prey Species ◽  
Stomach Contents ◽  
Southeastern Brazil ◽  
Yellow Catfish ◽  
Stomach Contents Analysis ◽  
Penaeid Shrimps ◽  
Brachyuran Crabs ◽  
Sciaenid Fish ◽  
Janeiro State

Diet of adult specimens of Yellow Catfish Aspistor luniscutis (Valenciennes, 1840) was determined through stomach contents analysis.  The specimens were target of commercial gillnet fisheries in northern Rio de Janeiro State, southeastern Brazil.  In this region, A. luniscutis is a generalist benthophagous feeder, consuming most available prey species with crustaceans, especially penaeid shrimps, brachyuran crabs, and sciaenid fish dominating. 

scholarly journals Diet of invasive pikeperch Sander lucioperca: developing non-destructive tissue sampling for stable isotope analysis with comparisons to stomach contents analysis

2018 ◽  
pp. 49 ◽  
Author(s):  
Emma T. Nolan ◽  
J. Robert Britton
Keyword(s):  
Stable Isotope ◽  
Stable Isotope Analysis ◽  
Prey Size ◽  
Isotope Analysis ◽  
Stomach Contents ◽  
Sander Lucioperca ◽  
Destructive Sampling ◽  
Stomach Contents Analysis ◽  
Non Destructive ◽  
Dietary Analyses

Impact assessments of invasive piscivorous fishes usually rely on dietary analyses to quantify their predation pressure on prey communities. Stomach contents analysis (SCA), typically a destructive sampling method, is frequently used for this. However, many invasive piscivores are exploited by catch-and-release sport angling, with destructive sampling often not feasible. Stable isotope analysis (SIA) provides an alternative dietary analysis tool to SCA, with use of fin tissue, scales and/or epidermal mucus potentially enabling its non-destructive application. Here, the diet of a population of pikeperch Sander lucioperca, an invasive sport fish to Great Britain, was investigated by applying SIA to a range of tissues. Testing SI data of dorsal muscle (destructive sampling) versus fin, scale and mucus (non-destructive sampling) revealed highly significant relationships, indicating that the tissues collected non-destructively can be reliably applied to pikeperch diet assessments. Application of these SI data to Bayesian mixing models predicted that as S. lucioperca length increased, their diet shifted from macro-invertebrates to fish. Although similar ontogenetic patterns were evident in SCA, this was inhibited by 54% of fish having empty stomachs. Nevertheless, SCA revealed that as S. lucioperca length increased, their prey size significantly increased. However, the prey:predator length ratios ranged between 0.08 and 0.38, indicating most prey were relatively small. These results suggest that when non-destructive sampling is required for dietary analyses of sport fishes, SIA can be applied using fin, scales and/ or mucus. However, where destructive sampling has been completed, SCA provides complementary dietary insights, especially in relation to prey size.

Feeding ecology and trophic level of the banded guitarfish, Zapteryx exasperata, inferred from stable isotopes and stomach contents analysis

2011 ◽  
Vol 95 (1) ◽  
pp. 65-77 ◽  
Author(s):  
María-del-Pilar Blanco-Parra ◽  
Felipe Galván-Magaña ◽  
J. Fernando Márquez-Farías ◽  
Carlos Alberto Niño-Torres
Keyword(s):  
Stable Isotopes ◽  
Trophic Level ◽  
Feeding Ecology ◽  
Stomach Contents ◽  
Stomach Contents Analysis

scholarly journals Inclusion of ecosystem information in US fish stock assessments suggests progress toward ecosystem-based fisheries management

2018 ◽  
Vol 76 (1) ◽  
pp. 1-9 ◽  
Author(s):  
Kristin N Marshall ◽  
Laura E Koehn ◽  
Phillip S Levin ◽  
Timothy E Essington ◽  
Olaf P Jensen
Keyword(s):  
Fisheries Management ◽  
Physical Environment ◽  
Stomach Contents ◽  
System Level ◽  
Fish Stock ◽  
Predation Mortality ◽  
Stock Assessments ◽  
Stomach Contents Analysis ◽  
Ecosystem Based Fisheries Management ◽  
Assessment Reports

Abstract The appetite for ecosystem-based fisheries management (EBFM) approaches has grown, but the perception persists that implementation is slow. Here, we synthesize progress toward implementing EBFM in the United States through one potential avenue: expanding fish stock assessments to include ecosystem considerations and interactions between species, fleets, and sectors. We reviewed over 200 stock assessments and assessed how the stock assessment reports included information about system influences on the assessed stock. Our goals were to quantify whether and how assessments incorporated broader system-level considerations, and to explore factors that might contribute to the use of system-level information. Interactions among fishing fleets (technical interactions) were more commonly included than biophysical interactions (species, habitat, climate). Interactions within the physical environment (habitat, climate) were included twice as often as interactions among species (predation). Many assessment reports included ecological interactions only as background or qualitative considerations, rather than incorporating them in the assessment model. Our analyses suggested that ecosystem characteristics are more likely to be included when the species was overfished (stock status), the assessment is conducted at a science centre with a longstanding stomach contents analysis program, and/or the species life history characteristics suggest it is likely to be influenced by the physical environment, habitat, or predation mortality (short-lived species, sessile benthic species, or low trophic-level species). Regional differences in stomach contents analysis programs may limit the inclusion of predation mortality in stock assessments, and more guidance is needed on best practices for the prioritization of when and how biophysical information should be considered. However, our results demonstrate that significant progress has been made to use best available science and data to expand single-species stock assessments, particularly when a broad definition of EBFM is applied.

A comparison of faecal and stomach contents analysis in the meadow vole (Microtus pennsylvanicus)

1973 ◽  
Vol 51 (7) ◽  
pp. 715-721 ◽  
Author(s):  
B. R. Neal ◽  
D. A. Pulkinen ◽  
B. D. Owen
Keyword(s):  
Correction Factor ◽  
Quantitative Assessment ◽  
Food Preferences ◽  
Stomach Contents ◽  
Microtus Pennsylvanicus ◽  
Meadow Vole ◽  
Paired Comparisons ◽  
Food Items ◽  
Faecal Samples ◽  
Stomach Contents Analysis

The food preferences of 14 specimens of Microtus pennsylvanicus were studied by the quantitative assessment of plant cuticular fragments in the stomachs and faeces. Paired comparisons of stomach with faecal observations indicated that sedges and dicotyledons were considerably underrated, grasses were generally slightly overrated, and unidentifiable fragments were considerably more abundant in the faecal samples. About half of the sedge and dicotyledon cuticular fragments appeared to be lost between the stomach and colon sampling sites. It was concluded that most of these fragments were rendered unidentifiable, but some were probably completely digested. Stomach and faecal samples provided similar estimates of food preferences when few sedges and dicotyledons were observed, but were markedly different when sedges and dicotyledons formed a substantial proportion of the diet. A simple correction factor was used to compensate for differences in the digestibility of the different food items. The corrected faecal observations were very similar to the stomach observations.

scholarly journals Occurrence of Polyprion americanus under floating objects in western Mediterranean oceanic waters, inference from stomach contents analysis

2000 ◽  
Vol 80 (4) ◽  
pp. 751-752 ◽  
Author(s):  
S. Deudero ◽  
B. Morales-Nin
Keyword(s):  
Juvenile Fish ◽  
Stomach Contents ◽  
Western Mediterranean ◽  
Purse Seine ◽  
Artificial Structures ◽  
Trophic Relation ◽  
Stomach Contents Analysis ◽  
Fish Aggregation ◽  
Floating Objects ◽  
Polyprion Americanus

Catches of 11 juvenile specimens of Polyprion americanus (Osteichthyes: Polyprionidae) are reported under fish aggregation devices (FADs) in waters off Mallorca (western Mediterranean). Sampling was carried out fortnightly by surrounding artificial FADs with a purse seine from April 1995 till February 1997. Juveniles were present from June–August. Specimens were mostly solitary during the period of association to the FADs, with a length interval of 25.8 and 34.2 cm total length. The trophic spectrum was analysed to explain a possible food link with the FAD. The diet of Polyprion was mainly based on juvenile fish Trachurus and the eunestonic isopod Idotea metallica that were associated with the objects providing evidence for a trophic relation to the artificial structures.

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