mortality rate

mortality rate
1) the rate at which the numbers in a population decrease with time due to various causes. The proportion of the total stock (in numbers) dying each year is the annual mortality rate. To facilitate calculations, mortality is expressed as an exponential rate (called instantaneous rate) thus Nt/N0 = e-Z = e-(M+F) in which Nt/N0 is the survival rate, M the natural mortality rate, F the fishing mortality rate, and Z the total mortality rate (of deaths due to predation or disease)
2) in fisheries the rate at which fish die from fishing and natural causes. Instantaneous rates with short time intervals are used to allow separation of the primary components as instantaneous fishing mortality (F) and instantaneous natural mortality (M). These two equal instantaneous total mortality (Z)
3) the number of deaths per unit of population over a specified period

Dictionary of ichthyology. 2009.

Игры ⚽ Поможем решить контрольную работу

Look at other dictionaries:

  • mortality rate — mortality, mortality rate The death rate, usually standardized by age and sex, to facilitate comparisons between areas and social groups. It provides a measure of health risks, improvements in the quality of health care, and the comparative… …   Dictionary of sociology

  • mortality rate — ➔ rate1 * * * mortality rate UK US noun [C] INSURANCE ► DEATH RATE(Cf. ↑death rate) …   Financial and business terms

  • Mortality rate — Crude death rate by country Mortality rate is a measure of the number of deaths (in general, or due to a specific cause) in a population, scaled to the size of that population, per unit time. Mortality rate is typically expressed in units of… …   Wikipedia

  • Mortality rate — A death rate. There are a number of different types of mortality rates as, for examples, the following: {{}}The fetal mortality rate: The ratio of fetal deaths to the sum of the births (the live births + the fetal deaths) in that year. The infant …   Medical dictionary

  • mortality rate — noun the ratio of deaths in an area to the population of that area; expressed per 1000 per year • Syn: ↑deathrate, ↑death rate, ↑mortality, ↑fatality rate • Hypernyms: ↑rate • Hyponyms: ↑ …   Useful english dictionary

  • mortality rate — the incidence of death in the population in a given period. The annual mortality rate is the number of registered deaths in a year, multiplied by 1000 and divided by the population at the middle of the year. See also: infant mortality rate,… …   The new mediacal dictionary

  • mortality rate — noun The percentage of deaths per some period of time. The mortality rate of people aged 50 or more that smoke is much higher than the one of non smokers in the same age group. Ant: birth rate …   Wiktionary

  • mortality rate — mirtingumas statusas T sritis biomedicinos mokslai apibrėžtis Mirčių per tam tikrą laikotarpį ir ↑vidutinio gyventojų skaičiaus santykis ↑arba mirčių ir ↑rizikos populiacijos narių stebėjimo laikotarpių sumos santykis. Dažniausiai apskaičiuojamas …   Lithuanian dictionary (lietuvių žodynas)

  • Mortality rate, infant — The number of children dying under a year of age divided by the number of live births that year. The infant mortality rate is also called the infant death rate. The infant mortality rate is an important measure of the well being of infants,… …   Medical dictionary

  • Mortality rate, fetal — The ratio of fetal deaths to the sum of the births (the live births + the fetal deaths) in that year. In the United States, the fetal mortality rate plummeted from 19.2 per 1,000 births in 1950 to 9.2 per 1,000 births in 1980 …   Medical dictionary

Share the article and excerpts

Direct link
Do a right-click on the link above
and select “Copy Link”