The Guts to Estimate Fish Daily Ration

1993 ◽  
Vol 50 (9) ◽  
pp. 1969-1975 ◽  
Author(s):  
Daniel Boisclair ◽  
François Marchand
Keyword(s):  
Digestive Tract ◽  
Significant Influence ◽  
Stomach Contents ◽  
Fold Increase ◽  
Daily Ration ◽  
Estimation Model ◽  
Evacuation Rate ◽  
Fish Stomach

We compared daily ration values estimated using the Elliott and Persson and the Eggers models implemented with field-derived variations in stomach and complete digestive tract (CDT) contents of fish. Stomach evacuation rate (0.31∙h−1) was 2.8 times greater than that of CDT (0.11∙h−1). Daily rations obtained using both models and sections of the digestive tract estimated at 2-h intervals averaged 0.84 (Trial 1), 2.56 (Trial 2), and 2.41 g dryl∙100 g wet−1∙d−1 (Trial 3) and never differed by more than 23.6% within trials (average = 11.4%). Variances in daily ration values from the Elliott and Persson model were, on average, 3.4 times larger than variances derived using Eggers model. Variances associated with daily rations on stomach contents were, on average, 5.9 times larger than variances based on CDT contents. Sampling frequencies (from 2- to 4-, 6-, 8-, and 12-h intervals) had no significant influence on mean daily ration values but, on average, caused a 3.6-fold increase in variances. The precision and robustness of daily ration values appeared more directly influenced by the section of digestive tract used than by the estimation model chosen; the Eggers model implemented with CDT contents appeared to be the most efficient combination.

Effect of water temperature on stomach evacuation rates, and estimation of daily food intake of bluegill sunfish (Lepomis macrochirus Rafinesque)

1990 ◽  
Vol 68 (3) ◽  
pp. 591-595 ◽  
Author(s):  
D. J. Booth
Keyword(s):  
Food Intake ◽  
Water Temperature ◽  
Field Experiments ◽  
Lepomis Macrochirus ◽  
Stomach Contents ◽  
Bluegill Sunfish ◽  
Field Methods ◽  
Daily Food Intake ◽  
Evacuation Rate ◽  
Daily Food

Field experiments were conducted over the summer of 1983 to determine food-evacuation rate and measure stomach fullness of bluegill sunfish (Lepomis macrochirus). A combination of these data gave estimates of daily food intake of fish. Fish were captured and held in large holding pens in Lake Opinicon, Ontario, Canada, and periodically subsampled over 24 h to monitor changes in mean weight of stomach contents. Stomach-evacuation rates obtained in this way increased significantly with water temperature over the range 10–25 °C. However, variation in stomach-evacuation rate was considerable, reducing the utility of water temperature as a predictor of stomach-evacuation rate. It is suggested that the simple field methods employed here to estimate stomach evacuation and food intake are more useful in the estimation of daily ration than the more commonly employed laboratory-based methods.

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.

Aspects of the feeding biology of the pectinacean Bathypecten vulcani, a peri-hydrothermal vent bivalve

2003 ◽  
Vol 83 (3) ◽  
pp. 479-482 ◽  
Author(s):  
Gaël LE PENNEC ◽  
Peter G. BENINGER ◽  
Marcel LE PENNEC ◽  
Anne DONVAL
Keyword(s):  
Digestive Tract ◽  
Hydrothermal Vent ◽  
Stomach Contents ◽  
Frontal Surface ◽  
Mineral Particles ◽  
East Pacific ◽  
Feeding Biology ◽  
Crystalline Style ◽  
Bathymodiolus Thermophilus ◽  
Cytological Characteristics

The feeding biology of Bathypecten vulcani, a peri-hydrothermal vent pectinacean, was investigated using histological and scanning electron microscope studies of the gills and stomach contents of specimens sampled from the 9° and 13°N sites of the East Pacific Rise. Salient characteristics were compared with those of Bathymodiolus thermophilus from the same and similar habitats. The gills of Bathypecten vulcani displayed heterogeneous organic and mineral particles on their frontal surface. The digestive tract possessed well-developed structures (whose anatomical and cytological characteristics indicated full functionality), typically found in bivalves from littoral aerobic environments, as well as in Bathymodiolus thermophilus, which is capable of suspension-feeding: oesophagus, stomach, crystalline style, digestive gland, and intestine. Observations of stomach contents revealed diverse particles from the photic zone, including debris from diatoms and coccolithophorans. In contrast to Bathymodiolus thermophilus, bacteria were rarely observed in the digestive tract, indicating a more complete reliance on surface-originating particles.

Daily ration and feeding activity of juvenile hake in the central Mediterranean Sea

2008 ◽  
Vol 88 (7) ◽  
pp. 1493-1501 ◽  
Author(s):  
P. Carpentieri ◽  
F. Colloca ◽  
G. Ardizzone
Keyword(s):  
Mediterranean Sea ◽  
Feeding Activity ◽  
Central Italy ◽  
Stomach Contents ◽  
Western Coast ◽  
Daily Ration ◽  
Gastric Evacuation ◽  
Central Mediterranean ◽  
Migratory Activity ◽  
Central Mediterranean Sea

We investigated daily ration, feeding rhythms and gastric evacuation rates of juvenile (<16 cm total length) European hake Merluccius merluccius, using stomach samples collected during four 24-hour trawl surveys carried out in 2001–2002 on the continental shelf-break (from 120 m to 160 m in depth) off the western coast of central Italy (central Mediterranean Sea). In each survey 8 hauls of 30 minutes were performed every three hours throughout the 24-hour period to cover the entire diel cycle. Diet of juvenile hake was mostly composed of the euphausiid Nyctiphanes couchii, showing a peak in stomach contents during early morning followed by a daytime decrease. Fullness index (%FI) was generally higher during sunrise when migratory activity ceased and juvenile hake return to the bottom after feeding. Concerning the hake abundance the highest density value was obtained in May during the recruitment period.Two independent daily ration estimates were produced. First, an empirical attempt to estimate the daily amount of food consumed was obtained by back-calculating the fresh weight of euphausiid prey ingested by juvenile hake. Estimated values ranged from 4.96–5.89% body wet weight (%BW). Second, the daily ration was computed applying the exponential gastric evacuation models proposed by Elliot & Persson (1978) and Eggers (1979). Daily ration values obtained using these consumption models produced a considerable (15–20%) underestimation of consumption rate for juvenile hake.

Feeding in a Nocturnally active fish, Galaxias brevipinnis, in a New Zealand stream

1989 ◽  
Vol 40 (3) ◽  
pp. 231 ◽  
Author(s):  
GJ Glova ◽  
PM Sagar
Keyword(s):  
New Zealand ◽  
Benthic Invertebrates ◽  
Stomach Contents ◽  
Feeding Habit ◽  
Native Fish ◽  
Selective Feeding ◽  
Chironomid Larvae ◽  
Feeding Periodicity ◽  
Active Fish ◽  
Fish Stomach

To determine the diel feeding periodicity and diet of a lake-inlet population of Galaxias brevipinnis in New Zealand, samples of benthos, drift and fish were collected over a 24-h period in summer. Both numerically and gravimetrically, fish stomach contents revealed that feeding started some time after sunset, peaked towards midnight, and virtually ceased after sunrise. Benthic invertebrates were consumed almost exclusively, with ephemeropterans, trichopterans, and dipterans constituting 95% of the total foods eaten, a major proportion being chironomid larvae. Size of prey eaten compared with size of invertebrates in the benthos differed significantly during the night; this indicated that some size-selective feeding occurred. The benthic feeding habit of Galaxias brevipinnis appears to allow it to forage on relatively small prey during the night, a phenomenon that has been reported for other bottom-dwelling native fish species in New Zealand.

scholarly journals Dominant Variables That Affect The Level of Profitability in Sharia Banks and Conventional Banks

2017 ◽  
Vol 3 (2) ◽  
pp. 126
Author(s):  
Irawati Junaeni
Keyword(s):  
Significant Influence ◽  
Commercial Banks ◽  
Random Effect ◽  
Random Effect Model ◽  
Estimation Model ◽  
Internal Factors ◽  
Regression Methods ◽  
Effect Model ◽  
Panel Data Regression ◽  
Conventional Banks

<p>This study aims to analyze the dominant factors that affect profitability in the Sharia Commercial Bank and Conventional Bank Indonesia Year 2009-2014. The sample used in this study is 7 Sharia Commercial Banks and 10 Conventional Commercial Banks in Indonesia. The technic sample used in this study by purposive sampling method. This research uses panel data regression methods and estimation model used is a Random Effect Model. The result of research on sharia bank of internal factors concludes that BOPO variable has a significant influence on return on asset (ROA) and from external factors of BI Rate significant effect on return on asset (ROA). While conventional banks of internal factors conclude that BOPO and NPL variable have significant influence to return on asset (ROA) and from external factor conclude that BI Rate has a significant effect to return on asset ROA). In this research, BOPO variable has a more dominant influence on  ROA than other variables.</p>

scholarly journals ANALISA PENGARUH INVESTASI DAN GDP RIIL TERHADAP PEMAKAIAN KONSUMSI ENERGI LISTRIK

2007 ◽  
Vol 9 (4) ◽  
pp. 565
Author(s):  
Dyah Wahyu Ermawati ◽  
David Kaluge
Keyword(s):  
Gross Domestic Product ◽  
Significant Influence ◽  
Domestic Product ◽  
Estimation Model ◽  
The Real ◽  
Real Gdp ◽  
Increasing Trend ◽  
Asean Countries ◽  
The Impact

The objective of this research is to analyze the impact of real GDP (Gross Domestic Product) and investment on the consumption of electricity energy in the ASEAN countries (Malaysia, Phillippine and Indonesia).  From the result of the analysis, it is found that there are significant influences of the real GDP and investment on the consumption of the electricity energy.  Partially, real GDP and investment doesn’t have any significant influence on the consumption of electricity for Malaysia and Indonesia.  Estimation model show that an increasing trend of consumption of electricity, investment and real GDP.

Biometry of Decapod Crustaceans in the Cantabrian Sea

Crustaceana ◽  
1993 ◽  
Vol 65 (2) ◽  
pp. 192-203 ◽  
Author(s):  
Enrique Rodríguez-Marín
Keyword(s):  
Feeding Habits ◽  
Stomach Contents ◽  
Demersal Fish ◽  
Body Parts ◽  
Decapod Crustaceans ◽  
Fish Stomach

AbstractIn this paper the biometric relationships between the different body parts of decapods are described, allowing the reconstruction of size and biomass (weight) of each sample from its hard parts (chelae and cephalothorax). The usefulness of this study lies in the interpretation of the feeding habits of demersal fish which feed on decapod crustaceans, since the slow digestion of hard skeletons of Decapods gives rise to the appearance of numerous hard parts in fish stomach contents.

scholarly journals Otolith atlas of fish of the Sinos River

2014 ◽  
Vol 74 (2) ◽  
pp. 274-282 ◽  
Author(s):  
CQ. Bremm ◽  
UH. Schulz
Keyword(s):  
Calcium Carbonate ◽  
Inner Ear ◽  
Digestive Tract ◽  
Fish Species ◽  
Stomach Contents ◽  
Species Specific

Otoliths are calcium carbonate structures located in the inner ear of fish; they are responsible for hearing and balance. The inner ear has three pairs of otoliths: the lapilli, the sagittae and the asterisci. The sagittae otoliths are the largest and their format is species-specific. Because of their composition, otoliths can resist to the digestive tract of ichthyophagous species, and they can be used as an important tool for identifying species of fish found in stomach contents. The purpose of this work is to provide a photographic guide of the sagittae otoliths of the main fish species from the Sinos River. This atlas consists of photographs of the sagittae otoliths of 36 species belonging to 15 families distributed in five orders.

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