Comparison of Methods Used to Estimate Age and Length of Fishes at Sexual Maturity Using Populations of White Sucker (Catostomus commersoni)

1991 ◽  
Vol 48 (8) ◽  
pp. 1446-1459 ◽  
Author(s):  
Edward A. Trippel ◽  
Harold H. Harvey
Keyword(s):  
Maximum Likelihood ◽  
Sexual Maturity ◽  
Probit Analysis ◽  
Likelihood Method ◽  
Type I ◽  
White Sucker ◽  
Age At Maturity ◽  
Catostomus Commersoni ◽  
Type Iv ◽  
First Occurrence

We compared six methods of estimating age and length at sexual maturity of iteroparous fishes: probit analysis, maximum likelihood methodology, linear regression on arcsine - square root transformed data, Lysack's formula, visual observation of distributions for the first occurrence of [Formula: see text] maturity, and computation of lt of the von Bertalanffy equation using age at maturity for t. To aid comparisons, we subdivided 32 white sucker (Catostomus commersoni) maturity distributions into four types: abrupt transition to maturity (type I), successive increases in proportion mature with increase in age or length (type II), nonsuccessive increases in proportion mature with increase in age or length (type III), and absence of 100% maturity at any age (type IV). Type I distributions were best represented by reporting the first occurrence of [Formula: see text] maturity, types II and III by probit analysis and the maximum likelihood method, and type IV distributions were not adequately represented by any method. Lysack's formula tended to produce high estimates for types II and III and negative values for some type IV distributions. Both the number and position of missing year classes influenced estimates of age at maturity. We recommend documenting maturity distributions with all estimates of age and size at maturity.

A Biochemical and Cytological Study of the Longnose Sucker (Catostomus catostomus) and Large and Dwarf Forms of the White Sucker (Catostomus commersoni)

1971 ◽  
Vol 28 (11) ◽  
pp. 1745-1748 ◽  
Author(s):  
R. J. Beamish ◽  
H. Tsuyuki
Keyword(s):  
Cytological Study ◽  
White Sucker ◽  
Age At Maturity ◽  
Catostomus Commersoni ◽  
Muscle Lactate ◽  
Early Maturing ◽  
Catostomus Catostomus ◽  
Lactate Dehydrogenases ◽  
Longnose Sucker

White (Catostomus commersoni) and longnose (C. catostomus) suckers possess diploid complements of 98 chromosomes, including metacentrics, submetacentrics, and acrocentrics. White sucker karyotypes differ consistently from longnose karyotypes by the presence of an additional four metacentrics. The karyotypes of the size and age at maturity of variants of white suckers were indistinguishable. Biochemically, longnose and white suckers are distinctive with respect to muscle myogens, hemoglobins, serum esterases, serum and muscle lactate dehydrogenases, and serum transferrins. The last group of proteins provides a clear genetic separation of the large-sized, late-maturing, and the dwarf, early-maturing white suckers. The former is polymorphic for serum transferrins.

scholarly journals Generalized Exponential Power Distribution with Application to Complete and Censored Data

2021 ◽  
pp. 34-55
Author(s):  
M. M. E. Abd El-Monsef ◽  
M. M. El-Awady
Keyword(s):  
Maximum Likelihood ◽  
Censored Data ◽  
Power Distribution ◽  
Real Data ◽  
Likelihood Method ◽  
Model Parameters ◽  
Type I ◽  
Sample Type ◽  
Exponential Power Distribution ◽  
Exponential Power

The exponential power distribution (EP) is a lifetime model that can exhibit increasing and bathtub hazard rate function. This paper proposed a generalization of EP distribution, named generalized exponential power (GEP) distribution. Some properties of GEP distribution will be investigated. Recurrence relations for single moments of generalized ordered statistics from GEP distribution are established and used for characterizing the GEP distribution. Estimation of the model parameters are derived using maximum likelihood method based on complete sample, type I, type II and random censored samples. A simulation study is performed in order to examine the accuracy of the maximum likelihood estimators of the model parameters. Three applications to real data, two with censored data, are provided in order to show the superiority of the proposed model to other models.

Response of fish communities to different levels of white sucker (Catostomus commersoni) biomanipulation in five temperate lakes

2001 ◽  
Vol 58 (10) ◽  
pp. 1998-2010 ◽  
Author(s):  
Philippe Brodeur ◽  
Pierre Magnan ◽  
Michel Legault
Keyword(s):  
Fish Species ◽  
Brook Trout ◽  
Salvelinus Fontinalis ◽  
Fish Communities ◽  
White Sucker ◽  
Age At Maturity ◽  
Catostomus Commersoni ◽  
Mass Removal ◽  
Males And Females ◽  
Different Levels

The goal of this study was to evaluate the response of white sucker (Catostomus commersoni), brook trout (Salvelinus fontinalis), and other fish species to the mass removal of white sucker in five Québec (Canada) lakes. White sucker removal ranged from 14.2 kg·ha–1 to 31.3 kg·ha–1 3 years after mass removal. In four of the study lakes, the proportion of 2+ to 4+ white sucker increased following mass removal. Mean catch and biomass per unit of effort of 1+ brook trout increased significantly in the lakes where white sucker removal was highest. All white sucker populations experienced growth increases after mass removal, and improved brook trout growth was observed in lakes where the most intensive mass removal occurred. These growth increases led to higher mean length at maturity in white sucker females and decreases in mean age at maturity in white sucker males and brook trout males and females. Mean adjusted fecundity significantly increased in white sucker and brook trout in lakes where mass removal was most intense. The present study suggests that white sucker and brook trout exhibit compensatory responses following a reduction of intra- and inter-specific competition and that these responses are related to the intensity of mass removal.

First occurrence of the North American white sucker Catostomus commersoni in Great Britain

1993 ◽  
Vol 42 (4) ◽  
pp. 615-617 ◽  
Author(s):  
G. H. Copp ◽  
C. Vaughan ◽  
Alwyne Wheeler
Keyword(s):  
Great Britain ◽  
North American ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
The North ◽  
First Occurrence

scholarly journals Some Properties and Estimation of Parameters for the Five Parameter Type I Generalized Half Logistic Distribution under Complete Observation

2020 ◽  
pp. 39-46
Author(s):  
O. A. Bello ◽  
P. O. Awodutire ◽  
I. Sule ◽  
H. O. Lawal
Keyword(s):  
Maximum Likelihood ◽  
Maximum Likelihood Method ◽  
Likelihood Method ◽  
Logistic Distribution ◽  
Type I ◽  
Lifetime Data ◽  
Estimation Of Parameters ◽  
Distribution Estimation ◽  
Complete Observation

This paper is a further study of the five parameter type I generalized half logistic distribution. We derived some properties of the distribution. Estimation of the parameters of the distribution under complete observation was studied using the maximum likelihood method. To assess the flexibility of the distribution, it was applied to a real lifetime data and the results when compared to the sub-models showed that the five parameter type I generalized half logistic distribution performed best.

Division and morphogenesis of Cryptobia catostomi (Protozoa: Kinetoplastida) in the blood of white sucker (Catostomus commersoni)

1977 ◽  
Vol 55 (7) ◽  
pp. 1093-1099 ◽  
Author(s):  
Susan M. Bower ◽  
Patrick T. K. Woo
Keyword(s):  
Nuclear Division ◽  
The Body ◽  
Parasite Population ◽  
Binary Fission ◽  
Type I ◽  
Type Ii ◽  
White Sucker ◽  
Catostomus Commersoni ◽  
Type Iii

Cryptobia catostomi multiplied in the blood of the white sucker (Catostomus commersoni) by longitudinal binary fission. The first indication of division was the production of two flagella followed by incomplete nuclear division. By this time the blepharoplast had divided. Each daughter blepharoplast, which gave rise to an old and a new flagellum, migrated to either end of the body. The kinetoplast then divided. The chromatin strand connecting the two nuclei disappeared and the organism completed division giving rise to two specimens.By following the course of infection in a mature white sucker it was observed that type III specimens were most abundant when the parasite population was increasing. As the population leveled off to a plateau, the numbers of type III decreased and were replaced by type II and eventually type I specimens.

scholarly journals Statistical Modelling with Birnbaum-Saunders Distribution

2021 ◽  
pp. 30-36
Author(s):  
Nuri Celik
Keyword(s):  
Maximum Likelihood ◽  
Reliability Analysis ◽  
Real Life ◽  
Statistical Modelling ◽  
Likelihood Method ◽  
Type I ◽  
Type I Errors ◽  
Monte Carlo Simulation Study ◽  
Nonnormal Distribution ◽  
Error Terms

In this article, it is assumed that the distribution of the error terms is the Birnbaum-Saunders distribution in the process of one-way ANOVA. The Birnbaum-Saunders distribution has been widely used in reliability analysis especially in fatigue-life models. In reliability analysis, nonnormal distribution is much more common than the normal distribution. We obtain the estimation of the parameters og interest by maximum likelihood method. We also propose new test statistics based on these estimators . The efficiencies of the maximum likelihood estimators and the Type I errors obtained by using the proposed estimators are compared with normal theory via Monte Carlo simulation study. At the end of the study, the real life example is given just for the illustration of the method.

Changes in hepatic mixed-function oxygenase (MFO) activity, plasma steroid levels and age at maturity of a white sucker (Catostomus commersoni) population exposed to bleached kraft pulp mill effluent

1991 ◽  
Vol 21 (3-4) ◽  
pp. 199-217 ◽  
Author(s):  
M.E. McMaster ◽  
G.J. Van Der Kraak ◽  
C.B. Portt ◽  
K.R. Munkittrick ◽  
P.K. Sibley ◽  
...  
Keyword(s):  
Kraft Pulp ◽  
Pulp Mill ◽  
Pulp Mill Effluent ◽  
White Sucker ◽  
Age At Maturity ◽  
Catostomus Commersoni ◽  
Kraft Pulp Mill ◽  
Bleached Kraft Pulp ◽  
Mixed Function Oxygenase

scholarly journals Left‑Censored Samples from Skewed Distributions: Statistical Inference and Applications

2018 ◽  
Vol 66 (1) ◽  
pp. 245-252
Author(s):  
Michal Fusek ◽  
Jaroslav Michálek
Keyword(s):  
Maximum Likelihood ◽  
Statistical Inference ◽  
Exponential Distribution ◽  
Information Matrix ◽  
Computational Procedure ◽  
Maximum Likelihood Estimates ◽  
Likelihood Method ◽  
Type I ◽  
Censored Samples ◽  
Asymptotic Tests

Left‑censored data occur frequently in many areas. At present, researchers pay attention to skewed censored distributions more frequently. This paper deals with statistical inference of type I multiply left‑censored Weibull and exponential distributions. It suggests a computational procedure for calculation of maximum likelihood estimates of the parameters. The expected Fisher information matrix for estimation of variances of estimated parameters is introduced. The estimates are then used for construction of confidence intervals for the expectation using the maximum likelihood method. Asymptotic tests for comparison of distributions (expectations respectively) of two independent left‑censored Weibull samples are proposed. Furthermore, asymptotic tests for assessing suitability of reduction of the Weibull distribution to the exponential distribution are introduced. Finally, the left‑censored exponential distribution is briefly described. Methods derived in this paper are illustrated on elemental carbon measurements, and can be applied in analysis of real environmental and/or chemical data.

Labelling of non-A, non-B hepatitis infected chimpanzee hepatocytes with nuclease-gold conjugates

1984 ◽  
Vol 42 ◽  
pp. 250-251
Author(s):  
G. D. Gagne ◽  
M. F. Miller ◽  
D. A. Peterson
Keyword(s):  
Endoplasmic Reticulum ◽  
Experimental Infection ◽  
Uranyl Acetate ◽  
Type I ◽  
Cellular Injury ◽  
Type Ii ◽  
Tubular Structures ◽  
Type Iii ◽  
Type Iv ◽  
Infected Chimpanzee

Experimental infection of chimpanzees with non-A, non-B hepatitis (NANB) or with delta agent hepatitis results in the appearance of characteristic cytoplasmic alterations in the hepatocytes. These alterations include spongelike inclusions (Type I), attached convoluted membranes (Type II), tubular structures (Type III), and microtubular aggregates (Type IV) (Fig. 1). Type I, II and III structures are, by association, believed to be derived from endoplasmic reticulum and may be morphogenetically related. Type IV structures are generally observed free in the cytoplasm but sometimes in the vicinity of type III structures. It is not known whether these structures are somehow involved in the replication and/or assembly of the putative NANB virus or whether they are simply nonspecific responses to cellular injury. When treated with uranyl acetate, type I, II and III structures stain intensely as if they might contain nucleic acids. If these structures do correspond to intermediates in the replication of a virus, one might expect them to contain DNA or RNA and the present study was undertaken to explore this possibility.

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