Related Experiment Video
Updated: May 18, 2026

Basic Methods for the Study of Reproductive Ecology of Fish in Aquaria
Published on: July 20, 2017
[Crow's index and reproductive characteristic of the Republic of Tatarstan population]
Abstract:
On the basis of 1212 questionnaires filled up by women of postreproductive age living in five districts of the Republic of Tatarstan (Arsky, Atninsky, Kukmorsky, Buinsky, and Drozhzhanovsky), the basic reproductive characteristics and Crow's index and its components have been calculated. The rural population is characterized by expanded reproduction with a mean sibship size of 2.68; in district administrative centers, there is only simple reproduction. Crow's index and its components for the rural Tatar population are Im = 0.026, If = 0.172, Itot = 0.202. Graphic analysis of the mutual positions of some populations studied has been carried out.
Related Concept Videos
Population Growth
What is Population Genetics?
Conservation of Small Populations
Conservation of Declining Populations
What are Populations and Communities?
Testing a Claim about Population Proportion
There are two methods of testing a claim about a population proportion: (1) Using the sample proportion from the data where a binomial distribution is approximated to the normal distribution and (2) Using the binomial probabilities calculated from the data.
The first method uses normal distribution as an approximation to the binomial distribution. The requirements are as follows: sample size is large...

