As introduced in Section 1, the stage class and anatomical terms have some relations.
In the studied model the fishing effort is considered as a control term, the stage classes as states and the quantity of captured fish as a measured output.
Stage class biased this seasonal pattern as follows.
By this stage the class had been renumbered under standard British Railways procedure, from 30900 to 30939.
The aim is to get an estimation of the biomass of fishes by stage class.
The exceptions are age and stage; the age or stage structure of populations (the fraction of individuals in each age or developmental stage class) is sometimes incorporated in the traditional models of population ecology.
We chose 25 individuals as the smallest sample size because smaller samples would yield too few individuals per stage class to resemble what a real study might sample.
The binomial distribution, which assumes homogeneous vital rates among individuals within a stage class, has a higher variance for a given mean value than a model with heterogeneous vital rates [22].
The change in deviance from deleting each factor (expressed as a percent of the residual deviance of the best model = 165.77) was as follows: tissue-sampling method (10.9%), season (4.6%), year (5.3%), stage class (6.4%), and season:stage class (4.3%).
