Food and Growth of Fishes.: I. A Growth Curve Derived from Experimental Data

1965 ◽  
Vol 22 (2) ◽  
pp. 521-542 ◽  
Author(s):  
J. E. Paloheimo ◽  
L. M. Dickie
Keyword(s):  
Growth Phase ◽  
Laboratory Experiments ◽  
Inflection Point ◽  
Growth Efficiency ◽  
Von Bertalanffy ◽  
Biological Productivity ◽  
Growth Data ◽  
Average Size ◽  
Growth Experiments

A general equation for growth of fishes is obtained through use of the relations among body weight, metabolic rate, and growth efficiency that have been found in laboratory experiments. The curves show an early inflection point and gradually decreasing growth rate thereafter, without a theoretical asymptote. When growth efficiency is constant this equation indicates that growth becomes nearly exponential and is fitted exactly by the Parker and Larkin (1959) equation. When growth efficiency decreases with increasing rations the curves become more complex, as described here.Growth curves having an asymptote, such as the von Bertalanffy curve, have often been fitted to growth data. When the estimated asymptote can be related to the inflection point of the early part of a growth phase, it is proportional to a physiological time scale suggested by the food–growth relations. Truly asymptotic growth would appear to result only from complex changes in metabolism, growth efficiency, or interactions with mortality of the sort suggested by Lee's phenomenon.Some consequences of these results of food–growth experiments are discussed in relation to studies of biological productivity, especially their bearing on objectives of fisheries management. They suggest that, in general, highest sustained yield from a particular growth phase or stanza is obtained from a type of cropping which results in a population of fish having an average size near that of the smallest fish in the stanza.

scholarly journals Bertalanffy-Pütter models for avian growth

PLoS ONE ◽  
2021 ◽  
Vol 16 (4) ◽  
pp. e0250515
Author(s):  
Norbert Brunner ◽  
Manfred Kühleitner ◽  
Katharina Renner-Martin
Keyword(s):  
Inflection Point ◽  
A Priori ◽  
Fixed Ratio ◽  
Logistic Growth ◽  
Light Pollution ◽  
Growth Curve Analysis ◽  
Growth Data ◽  
Richards Model ◽  
Lower Ratio ◽  
Blue Tits

This paper explores the ratio of the mass in the inflection point over asymptotic mass for 81 nestlings of blue tits and great tits from an urban parkland in Warsaw, Poland (growth data from literature). We computed the ratios using the Bertalanffy-Pütter model, because this model was more flexible with respect to the ratios than the traditional models. For them, there were a-priori restrictions on the possible range of the ratios. (Further, as the Bertalanffy-Pütter model generalizes the traditional models, its fit to the data was necessarily better.) For six birds there was no inflection point (we set the ratio to 0), for 19 birds the ratio was between 0 and 0.368 (lowest ratio attainable for the Richards model), for 48 birds it was above 0.5 (fixed ratio of logistic growth), and for the remaining eight birds it was in between; the maximal observed ratio was 0.835. With these ratios we were able to detect small variations in avian growth due to slight differences in the environment: Our results indicate that blue tits grew more slowly (had a lower ratio) in the presence of light pollution and modified impervious substrate, a finding that would not have been possible had we used traditional growth curve analysis.

scholarly journals Effects of different factors on the growth efficiency of rice seedlings

1970 ◽  
Vol 36 (2) ◽  
pp. 171-176 ◽  
Author(s):  
Munnujan Khanam ◽  
Mohammad Al-Yeasa ◽  
Md Sazzadur Rahman ◽  
Abdullah Al-Mahbub ◽  
AR Gomosta
Keyword(s):  
Seed Size ◽  
Seedling Growth ◽  
Salt Solution ◽  
Laboratory Experiments ◽  
Growth Efficiency ◽  
Accelerated Ageing ◽  
Rice Seedlings ◽  
Salinity Levels ◽  
Rice Genotypes ◽  
Seedling Characteristics

Laboratory experiments were conducted to study the effect of salt solution, and size and ageing of seeds on growth efficiency of rice seedlings. Variation in growth efficiency due to different factors was significant. Seeds of Pokkali, BRRI dhan 29, BRRI dhan 40 and BRRI dhan 41 rice genotypes were used. Growth efficiency and other seedling characteristics decreased as salinity levels increased. Three varieties of rice BR 14, BRRI dhan 28 and BR 1, which are large, medium and small grain variety, respectively, were used to study the effect of seed size on growth efficiency and seedling growth. All the parameters decreased remarkably with decreasing seed size. Seed size influenced the growth efficiency significantly. For accelerated ageing test five varieties of freshly harvested seeds were used. The tested varieties responded differently for growth efficiency. When the ageing treatments were extended to 72 hours the growth efficiency depressed markedly for most of the varieties. Key words: Growth efficiency, Ageing, Rice, Salt solution, Seedling growth, Seed size DOI = 10.3329/bjb.v36i2.1508 Bangladesh J. Bot. 36(2): 171-176, 2007 (December)

scholarly journals Experimental study of the effect of adding nanoparticles on the rheological properties of oil-based drilling fluids

2021 ◽  
Vol 2057 (1) ◽  
pp. 012120
Author(s):  
E I Mikhienkova ◽  
A V Minakov ◽  
A V Matveev ◽  
S V Lysakov
Keyword(s):  
Experimental Study ◽  
Rheological Properties ◽  
Systematic Study ◽  
Laboratory Experiments ◽  
Drilling Fluids ◽  
Average Size ◽  
Nanoparticle Additives

Abstract A systematic study of the effect of nanoparticles of various concentrations and sizes on the rheological properties of various oil-based drilling fluids with nanoparticle additives has been carried out. The concentration of nanoparticles in drilling emulsions varied from 0.25 to 2 wt%, and the average size of nanoparticles ranged from 18 to 100 nm. As a result of numerous laboratory experiments, formulations and technology for the preparation of stable oil-based drilling fluids with additives of nanoparticles have been developed. The effect of nanoparticles on the viscosity and rheological properties of these drilling fluids has been studied.

scholarly journals A GROWTH STUDY OF BEEF CATTLE

1981 ◽  
Vol 61 (4) ◽  
pp. 1041-1048 ◽  
Author(s):  
L. A. GOONEWARDENE ◽  
R. T. BERG ◽  
R. T. HARDIN
Keyword(s):  
Birth Weight ◽  
Beef Cattle ◽  
Inflection Point ◽  
Prediction Errors ◽  
Von Bertalanffy ◽  
University Of Alberta ◽  
Inflection Points ◽  
Richards Function ◽  
Residual Variances ◽  
The University

Four growth equations (Richards, Brody, Von Bertalanffy and Logistic) were fitted to data from two breed groups of female beef cattle, purebred Hereford (HE) and synthetic of Charolais, Angus and Galloway (SY), which were maintained at the University of Alberta beef breeding research ranch at Kinsella, Alberta. All functions fitted three common parameters (an asymptote, an integration constant and a maturing rate parameter). Two functions (Von Bertalanffy and Logistic) had fixed inflection points while the Richards function fitted the inflection point as a fourth parameter. The Brody function had no inflection point. Based on the R2, mean prediction errors (MPE) and residual variances, the Richards function, with a variable inflection point, provided the best overall and the most consistent fit to both sets of data, followed by the Brody function with no inflection point. The Richards was the only function that could predict birth weight with any degree of accuracy. The Logistic and Von Bertalanffy functions, with fixed inflection points, provided poor estimates of actual weights at each end of the growth curve, overestimating birth weight and converging too early leading to underestimation of adult weight or the asymptote. Intermediate weights were reasonably well estimated by these functions. The HE group showed a 28% greater maturing rate compared with the SY based on the Richards function.

scholarly journals Growth of Crassostrea gasar cultured in marine and estuary environments in Brazilian waters

2013 ◽  
Vol 48 (8) ◽  
pp. 975-982 ◽  
Author(s):  
Gustavo Ruschel Lopes ◽  
Carlos Henrique Araujo de Miranda Gomes ◽  
Cláudio Rudolfo Tureck ◽  
Claudio Manuel Rodrigues de Melo
Keyword(s):  
Weight Gain ◽  
Nonlinear Models ◽  
Size Class ◽  
Von Bertalanffy ◽  
Southern Brazil ◽  
Growth Data ◽  
Shell Size ◽  
Shell Weight ◽  
Data Set ◽  
Study Sites

The objective of this work was to evaluate the growth of the mangrove oyster Crassostrea gasar cultured in marine and estuarine environments. Oysters were cultured for 11 months in a longline system in two study sites - São Francisco do Sul and Florianópolis -, in the state of Santa Catarina, Southern Brazil. Water chlorophyll-α concentration, temperature, and salinity were measured weekly. The oysters were measured monthly (shell size and weight gain) to assess growth. At the end of the culture period, the average wet flesh weight, dry flesh weight, and shell weight were determined, as well as the distribution of oysters per size class. Six nonlinear models (logistic, exponential, Gompertz, Brody, Richards, and Von Bertalanffy) were adjusted to the oyster growth data set. Final mean shell sizes were higher in São Francisco do Sul than in Florianópolis. In addition, oysters cultured in São Francisco do Sul were more uniformly distributed in the four size classes than those cultured in Florianópolis. The highest average values of wet flesh weight and shell weight were observed in São Francisco do Sul, whereas dry flesh weight did not differ between the sites. The estuary environment is more promising for the cultivation of oysters.

Comparison and estimation of the growth curve models of Hanwoo steer (Bos taurus coreanae)

2018 ◽  
Author(s):  
Hu-Rak Park ◽  
Seung-Hoon Eum ◽  
Seung-Hee Roh ◽  
Jakyeom Seo ◽  
Seong-Keun Cho ◽  
...  
Keyword(s):  
Body Weight ◽  
Logistic Model ◽  
Bos Taurus ◽  
Growth Models ◽  
Logistic Models ◽  
Regression Equations ◽  
Von Bertalanffy ◽  
Growth Data ◽  
Growth Ratio ◽  
Mean Square Errors

The present study was conducted to estimate and compare the three types of growth models in Hanwoo steer (Bos aurus coreanae). The Gompertz, Von Bertalanffy, and Logistic nonlinear models were used. A total of 2,239 Hanwoo steers (Bos taurus coreanae) from 6 months to 24 months old (2003 to 2014) and 8,916 growth data from the Hanwoo improvement Center were used to estimate the growth model which included three parameters. These parameters were A, mature body weight; b, growth ratio; and k, intrinsic growth rate. Regression equations using the Gompertz, Von Bertalanffy, and Logistic models were calculated as respectively. The mean square errors (MSEs) for each model were 1945.9, 1958.7, and 1935.0, respectively. The equation using the Logistic model showed the lowest value among three models. The estimated birth weights from the Gompertz, Von Bertalanffy, and Logistic models were 50.35 kg, 36.94 kg, and 74.13 kg, respectively. Furthermore, the estimated mature weights from the Gompertz, Von Bertalanffy, and Logistic models were 919.0 kg, 1043.3 kg, and 770.0 kg, respectively. In addition, the estimated age and body weight at inflection from the Gompertz, Von Bertalanffy, and Logistic models were 349.0 days and 338.1 kg, 317.9 days and 308.2 kg, and 397.8 days and 385.0 kg, respectively. Based on the results, we concluded that the regression equation using the Logistic model was the most appropriate among the growth models for measuring data. However, further studies would be needed in order to obtain more accurate parameters using a much wider period of data from birth to shipping age.

Evaluation of a Method for Estimating Food Consumption Rates of Fish

1973 ◽  
Vol 30 (5) ◽  
pp. 623-629 ◽  
Author(s):  
Robert F. Carline ◽  
James D. Hall
Keyword(s):  
Food Consumption ◽  
Coho Salmon ◽  
Oncorhynchus Kisutch ◽  
Growth Efficiency ◽  
Behavior Patterns ◽  
Growth Data ◽  
Wide Range ◽  
Consumption Rates ◽  
Similar Growth ◽  
Experimental Stream

A method of estimating food consumption rates of fish in nature from laboratory growth data was evaluated using juvenile coho salmon (Oncorhynchus kisutch) in three similar experiments. One group of coho was held individually in aquariums where movement was restricted. Another group was maintained in an experimental stream where the coho displayed many of their typical behavior patterns. All fish were fed known rations and both groups had similar growth efficiencies over a wide range of rations. Coho feeding at intermediate rates had the highest gross efficiencies. Aggressive activity did not affect growth efficiency. Results suggested that laboratory food and growth data may provide reasonably accurate estimates of food consumption of coho salmon in nature.

scholarly journals Microzooplankton functional responses in the lab and in the field

2014 ◽  
Vol 7 (1) ◽  
pp. 149-167 ◽  
Author(s):  
S. F. Sailley ◽  
E. T. Buitenhuis
Keyword(s):  
Growth Rate ◽  
Functional Response ◽  
Laboratory Experiments ◽  
Nutrient Content ◽  
Growth Efficiency ◽  
External Factors ◽  
Data Sets ◽  
Functional Responses ◽  
Prey Concentration ◽  
Gross Growth Efficiency

Abstract. We present a collection of data relating to microzooplankton physiological traits collected from the literature. We define microzooplankton as unicellular zooplankton (protozoans). The collected data mostly relates to grazing rates collected either in the field or through laboratory experiments. There is an equal number of grazing and growth rate measured through laboratory experiments and a smaller number of Gross Growth Efficiency (GGE), respiration and egestion values. Although the collected data showed inconsistencies in units, or gaps in knowledge of microzooplankton (e.g. effect of prey nutrient content, combined measurement of grazing and growth), they also contained information on microzooplankton functional response, and how some external factors affect them (e.g. prey concentration, prey offered, temperature). Link to the repository: doi:10.1594/PANGAEA.820368 and doi:10.1594/PANGAEA.826106. Note that the sum of all data sets differs from the present data compilations which provides harmonized units and temperature adjusted metabolic. Within the repository there is a link to the "raw" dataset.

scholarly journals Comparison of Non Linear Models and Artificial Neural Network to Describe the Liveweight from Birth to Maturity in Female Jersey Cattle

2021 ◽  
pp. 114-119
Author(s):  
D. O. Omoniwa ◽  
J. E. T. Akinsola ◽  
R. O. Okeke ◽  
J. M. Madu ◽  
D. S. Bunjah Umar
Keyword(s):  
Neural Network ◽  
Goodness Of Fit ◽  
Inflection Point ◽  
Linear Models ◽  
Network Models ◽  
Linear Functions ◽  
Growth Data ◽  
Neural Network Models ◽  
Jersey Cattle ◽  
Non Linear

Evaluation of growth data is an important strategy to manage gross feed requirement in female Jersey cattle in the New Derived Guinea Savannah Zone of Nigeria. Two non-linear functions (Gompertz and Logistic) and Neural network models were used to fit liveweight (LW)-age data using the non linear procedure of JMP statistical software. Data used for this study were collected from 150 Jersey female cattle in Shonga Dairy Farm, Kwara, State from 2010-2018. The Neural network function showedthe best goodness of fit. Both the Gompertz and Logistic functions overestimated LW at birth, 3, 36, 48, 60 and 72months respectively. NN function overestimated the LW at 0, 3, 24, 36 and 72 months. The Gompertzfunction had the best estimation of asymptotic weight (649.51 kg) with average absolute growth rate (0.061 kg/day).The inflection point was 15.95, 9.55 and 34.5 months in Logistic, Gompertz and neural network models, respectively. A strong and positive correlation was observed between asymptote and inflection point in Gompertz functions. The metrics of goodness of fit criteria (R2 and RMSE), showed that NN with multilayer perceptron was superior to the other models but Gompertz model, was best in its ability to approximate complex functions of growth curve parametersin female Jersey cattle.

scholarly journals Growth Patterns of birds, dinosaurs and reptiles: Are differences real or apparent?

2019 ◽  
Author(s):  
Norbert Brunner ◽  
Manfred Kühleitner ◽  
Werner-Georg Nowak ◽  
Katharina Renner-Martin ◽  
Klaus Scheicher
Keyword(s):  
Differential Equation ◽  
Growth Pattern ◽  
Broiler Chicken ◽  
Growth Models ◽  
Growth Patterns ◽  
Von Bertalanffy ◽  
Growth Data ◽  
Quantitative Studies ◽  
Best Fitting

AbstractSystematics of animals was done on their appearance or genetics. One can also ask about similarities or differences in the growth pattern. Quantitative studies of the growth of dinosaurs have made possible comparisons with modern animals, such as the discovery that dinosaurs grew in relation to their size faster than modern reptiles. However, these studies relied on only a few growth models. If these models are false, what about the conclusions? This paper fits growth data to a more comprehensive class of models, defined by the von Bertalanffy-Pütter differential equation. Applied to data about dinosaurs, reptiles and birds, the best fitting models confirmed that dinosaurs may have grown faster than alligators. However, compared to modern broiler chicken, this difference was small.

Sign in / Sign up

Export Citation Format

Share Document